You've received your 1099-DA from [Exchange] – now comes the critical step of properly transferring that information to IRS Form 8949 (Sales and Other Dispositions of Capital Assets).

Getting Form 8949 wrong can trigger IRS notices, audits, or result in overpaying your taxes by thousands of dollars.

This is because the IRS automatically matches the proceeds on your 1099-DA against what you report on Form 8949. Any discrepancies can flag your return for review.

Read the steps below, then learn how Summ can handle the process for you.

5. Apply codes: Use adjustment codes (Code B or E) if your cost basis differs from what's on the 1099-DA.

Quick steps: How to report [Exchange] Transactions on Form 8949

4. Fill out Form 8949: Work through column by column, ensuring proceeds match your 1099-DA exactly.

1. Gather transaction history: Collect your \[Exchange\] 1099-DA, cost basis records, and complete transaction history.

3. Allocate holding period: Determine if your transactions are short-term (Part I) or long-term (Part II).

2. Check for errors: Verify your 1099-DA for accuracy and identify any missing or incorrect cost basis.

6. Fill out Schedule D: Transfer Form 8949 totals to Schedule D and verify all calculations.

7. File before deadline: File your tax return before the April 15th deadline.

Before you Begin: Check your 1099-DA is Accurate

Before filling out Form 8949, it's essential to understand how it relates to your 1099-DA and why accuracy matters.

Why your 1099-DA and Form 8949 must match

The IRS receives a copy of your 1099-DA directly from [Exchange]. They use automated systems to match the proceeds reported on your 1099-DA against the proceeds you report on Form 8949.

Here's what the IRS matching process looks like

1. [Exchange] files your 1099-DA with the IRS (you receive a copy)
2. You file your tax return including Form 8949
3. IRS computers automatically compare the two documents
4. If proceeds don't match: Your return is flagged for potential audit or you receive a CP2000 notice

What must match On Both Forms

• Gross proceeds – The total sale amounts must be identical
• Taxpayer information – Your SSN and name

What Y

You may submit different information on your 8949, to what is reported on your 1099-DA, for cost basis and gain/loss calculations. You may only do so provided you maintain proper documentation that demonstrates why the changes are necessary.

following information may differ between your 1099-DA and Form 8949, provided you maintain proper documentation.

In 2026, many 1099-DA's

Cost basis:‍

It's not uncommon for your true cost basis may differ to what is reported by the exchange. As such, you may have more accurate cost basis information than what's on the 1099-DA.

For instance, if you transferred assets in to [Exchange] from a different wallet or exchange, and then sold them on [Exchange], then [Exchange] is unaware of the actual amount you paid to acquire the asset.

Before filing your 8949, you need to reconcile any inaccuracies on your 1099-DA, or else risk signficicant overpayment or an audit due to incorrect data or mismatched records

• Gains/losses – Will differ if you're correcting missing or incorrect cost basis

Common filing mistakes that create red flags

❌ Mistake #1: Not reporting transactions at all
Some taxpayers mistakenly think if they just don't file anything, the IRS won't notice. The IRS has your 1099-DA showing proceeds—not reporting it is the fastest way to trigger an audit.

❌ Mistake #2: Reporting different proceeds amounts
Your Form 8949 proceeds must match the 1099-DA exactly. Even rounding errors can trigger a mismatch.

❌ Mistake #3: Accepting blank cost basis as accurate
If your 1099-DA shows $0 or blank cost basis, don't just accept it—you'll pay taxes on phantom gains. You must research and report your actual cost basis.

❌ Mistake #4: Using the wrong short-term vs. long-term designation
Assets held ≤ 1 year go on Part I (short-term). Assets held > 1 year go on Part II (long-term). Getting this wrong means incorrect tax rates.

❌ Mistake #5: Forgetting to check the correct box
Form 8949 has three boxes (A, B, C) indicating whether cost basis was reported to the IRS. Checking the wrong box creates confusion.

How IRS automation triggers audits

The IRS uses the Automated Underreporter (AUR) program to identify discrepancies:

• When proceeds on your 1099-DA don't match your Form 8949, the system flags it
• You'll typically receive a CP2000 notice (not technically an audit, but requires response)
• The notice proposes additional tax, penalties, and interest
• You must respond with documentation proving your reported amounts are correct

The good news: If you properly complete Form 8949 with accurate cost basis and documentation, you can resolve any notices quickly. This is where Summ's audit trail documentation becomes invaluable.

Checklist: How to Verify your [Exchange] 1099-DA

Before using your 1099-DA data, verify its accuracy:

✅ Check #1: Identify reportable vs. non-reportable transactions

Your 1099-DA should only include:

• Sales of crypto for fiat (e.g., selling Bitcoin for USD)
• Crypto-to-crypto trades (e.g., trading ETH for BTC)

It should NOT include:

• ❌ Transfers between your own wallets (not a sale)
• ❌ Purchases of crypto (not a disposition)
• ❌ Receiving staking rewards (reported on 1099-MISC, not 1099-DA)

If you see incorrect items, contact [Exchange] for a corrected form.

✅ Check #2: Understand gross proceeds vs. net proceeds

Your 1099-DA will typically show gross proceeds (sale price before fees). However, you're entitled to reduce your proceeds by transaction fees, which increases your cost basis and reduces your gain.

Different exchanges handle this differently:

• Some show gross proceeds and report fees separately
• Some show net proceeds (already reduced by fees)
• Some don't report fees at all

✅ Check #3: Spot common 1099-DA reporting errors

Common issues to look for on your [Exchange] 1099-DA:

• Missing transactions: Compare your 1099-DA to your downloaded transaction history –Every sale should be included
• Duplicate transactions: Sometimes system errors cause double-reporting
• Wrong dates: Verify sale dates match your records‍
• Incorrect proceeds: Check that sale amounts match what you actually received

‍✅ Check #4: Identify the reporting category

‍Your 1099-DA will indicate whether [Exchange] reported cost basis to the IRS. This determines which box to check on Form 8949:

• Cost basis reported to IRS: Check Box A (short-term) or Box D (long-term)
• Cost basis NOT reported: Check Box B (short-term) or Box E (long-term)
• 1099-DA not received but should have been: Check Box C (short-term) or Box F (long-term)

For 2025 tax year (first year of 1099-DA), most transactions will fall under Box B or E since cost basis reporting wasn't required yet.

If you find errors on your 1099-DA

Option 1: Request a corrected 1099-DA from [Exchange]Contact [Exchange] support and explain the error. They may issue a corrected form (Form 1099-DA-C). However, this can take weeks.Option 2: File with accurate information and document the discrepancyYou're not required to report incorrect information just because it's on your 1099-DA. You can:

• Report the accurate amounts on Form 8949
• Use adjustment codes to explain differences
• Attach a statement explaining the discrepancy
• Keep documentation for potential IRS inquiries

Summ automatically handles these adjustments and generates supporting statements.

Step-by-step: How to fill out form 8949 using your [exchange] 1099

Step 1: Gather and reconcile your documents

Before touching Form 8949, you need to assemble all relevant documents and verify the data.

Documents you'll need

1. Your [Exchange] 1099-DA

Your 1099-DA will show:

• Capital loss carryforwards
• Prior year transactions affecting current year cost basis

• Box 1f: Proceeds from digital asset sales
• Box 1g: Cost or other basis (may be blank)
• Box 2: Date of each sale
• Box 3: Description and quantity of digital assets sold
• Additional boxes for adjustments, wash sales, etc.

You may need last year's Schedule D if you have:

2. Complete cost basis records

5. Prior year tax returns

If your 1099-DA has missing cost basis, you need documentation showing:

If you trade on multiple platforms, you'll receive separate 1099-DAs from each. All must be reconciled on your Form 8949.

• Original purchase date
• Original purchase price
• Transaction fees
• Source of the crypto (which exchange/wallet)

4. 1099-DAs from other exchanges (if applicable)

Need help finding missing cost basis? See our guide: How to Find 1099-DA Missing Cost Basis on [Exchange]

• All reported transactions appear on your 1099-DA
• No transactions were incorrectly included or excluded
• Dates and amounts match your records

3. Transaction history from [Exchange]

Download your complete transaction history from [Exchange] to verify:

‍

Step 2: How to fill out Form 8949 column by column

‍Now that you've verified your data, let's walk through filling out Form 8949 using your [Exchange] 1099-DA.Part I vs. Part II: Short-term vs. long-termForm 8949 has two main parts:Part I – Short-Term Capital Gains and Losses

• For assets held 1 year or less
• Gains taxed as ordinary income (10% to 37% based on your tax bracket)

Part II – Long-Term Capital Gains and Losses

• For assets held more than 1 year
• Gains taxed at preferential rates (0%, 15%, or 20%)

You'll need to separate your [Exchange] transactions based on holding period. If you held Bitcoin for 8 months before selling, it goes in Part I. If you held for 18 months, it goes in Part II.Selecting the correct checkboxAt the top of each part, check ONE box:Part I Boxes (Short-Term):

• (A) – Short-term with cost basis reported to IRS on Form 1099-DA
• (B) – Short-term with cost basis NOT reported to IRS
• (C) – Short-term for which you didn't receive a 1099-DA

Part II Boxes (Long-Term):

• (D) – Long-term with cost basis reported to IRS on Form 1099-DA
• (E) – Long-term with cost basis NOT reported to IRS
• (F) – Long-term for which you didn't receive a 1099-DA

For [Exchange] 1099-DA transactions:

• Most 2025 tax year transactions will be (B) or (E) since cost basis wasn't required for reporting
• Starting with 2026 tax year, some may be (A) or (D) if cost basis was reported
• Your 1099-DA should indicate which category applies

If you have transactions in multiple categories, you'll need multiple Form 8949 pages (one for each box checked).Column-by-column instructions[Screenshot: Blank Form 8949 with columns labeled]Column (a): Description of PropertyEnter a brief description of the digital asset sold:Examples from [Exchange]:

• "0.5 Bitcoin (BTC)"
• "10 Ethereum (ETH)"
• "500 Cardano (ADA)"

Tips:

• Use the quantity and ticker symbol from your 1099-DA
• Be specific—"Bitcoin" not just "crypto"
• If you have many transactions, you can attach a statement and write "See attached statement for details"

Column (b): Date AcquiredThis is the date you originally acquired the crypto—not the date you transferred it to [Exchange].Example:

• You bought Bitcoin on Coinbase on January 15, 2024
• You transferred it to [Exchange] on March 1, 2024
• You sold it on [Exchange] on June 1, 2025
• Column (b) date: January 15, 2024

If you can't determine the exact date:

• Write "VARIOUS" if you're selling crypto acquired on multiple dates
• Make sure your cost basis calculation uses the appropriate inventory method (FIFO, LIFO, or Specific ID)

Where to find this:

• Your original purchase records from wherever you first bought the crypto
• Summ automatically tracks acquisition dates across all platforms

Don't have acquisition date records? See: How to Find 1099-DA Missing Cost Basis on [Exchange]Column (c): Date Sold or DisposedThis is the date shown on your [Exchange] 1099-DA for when you sold the crypto.Copy this directly from:

• Box 2 on your 1099-DA (or equivalent field)
• Your [Exchange] transaction confirmation

Important: Use the exact date from the 1099-DA—even if your records show a slightly different time due to time zones. The IRS matches against what [Exchange] reported.Column (d): ProceedsThis is the amount you received from the sale (before subtracting cost basis).Copy this directly from:

• Box 1f on your 1099-DA (or equivalent field labeled "Proceeds")

Critical: The amount in Column (d) must match what's on your 1099-DA exactly. This is what the IRS will cross-reference.Important notes:

• Some 1099-DAs show gross proceeds (before fees)
• Some show net proceeds (after fees)
• [Exchange-specific note on how [Exchange] reports proceeds]
• Don't adjust this number—if fees weren't deducted, you'll account for them in cost basis

Example:

• You sold 1 ETH for $3,000 on [Exchange]
• Transaction fee was $30
• If [Exchange] reports gross proceeds: Column (d) = $3,000
• If [Exchange] reports net proceeds: Column (d) = $2,970

Column (e): Cost or Other BasisThis is your original purchase price plus any transaction fees.Where this comes from:

• Your cost basis records (what you originally paid for the crypto)
• Transaction fees when you purchased
• Transaction fees when you sold (if not already deducted from proceeds)

Example:

• You bought 1 ETH for $2,000
• Paid $25 purchase fee
• Paid $30 sale fee (not deducted from proceeds)
• Column (e) = $2,055 ($2,000 + $25 + $30)

If your 1099-DA shows blank or $0 cost basis:This is the most common issue. Your 1099-DA may not have cost basis, but you must report it on Form 8949.Sources for cost basis:

• Your original purchase records from any exchange/wallet
• Blockchain transaction history
• Historical price data for the acquisition date
• Summ complete transaction tracking

Need help? See: How to Find 1099-DA Missing Cost Basis on [Exchange]Special cases:

• Mining/staking rewards: Cost basis = fair market value when received (also your income amount)
• Gifts received: Cost basis = giver's original cost basis
• Inheritance: Cost basis = fair market value on date of death
• Airdrops: Cost basis = fair market value when received

Column (f): Code(s) from Instructions & Column (g): Amount of AdjustmentThese columns are for adjustments to your proceeds or cost basis, using IRS codes.Common codes for crypto transactions:

• Code B – Cost basis reported on 1099-DA is incorrect
• Code E – Cost basis is being reported by you (wasn't on 1099-DA)
• Code W – Wash sale adjustment

When to use adjustment codes:Scenario 1: Missing cost basis on 1099-DA

• Your 1099-DA shows $0 cost basis but you know it's $2,000
• Column (e): Enter $2,000
• Column (f): Enter "E"
• Column (g): Leave blank or enter the $2,000 again

Scenario 2: Incorrect cost basis on 1099-DA

• Your 1099-DA shows cost basis of $1,000
• Your records prove it's actually $2,500
• Column (e): Enter $2,500
• Column (f): Enter "B"
• Column (g): Enter the $1,500 difference

Scenario 3: Transaction fees not reflected

• Your proceeds and cost basis don't include fees you paid
• Column (e): Include fees in your cost basis
• Column (g): Enter the fee amount if it's an adjustment

For most [Exchange] users with missing cost basis (common in 2025), you'll use Code E.Column (h): Gain or (Loss)This is calculated automatically:Column (h) = Column (d) - Column (e) - Column (g)Or more simply:
Gain/Loss = Proceeds - Cost Basis - AdjustmentsExample:

• Proceeds: $5,000
• Cost basis: $3,200
• Adjustments: $0
• Gain = $1,800

Reporting losses:If your cost basis exceeds proceeds, you have a loss. Write it as a negative number in parentheses:Example:

• Proceeds: $2,000
• Cost basis: $3,000
• Loss = ($1,000)

Losses are valuable—they offset gains and up to $3,000 of ordinary income.[Exchange]-specific scenarios[This section will be customized per exchange with relevant screenshots]Handling consolidated transaction reportingSome exchanges report each individual transaction separately on the 1099-DA. Others consolidate similar transactions. [Exchange] typically [describe specific approach].If [Exchange] consolidates transactions:

• You can report them individually on Form 8949 (more detailed)
• Or report the consolidated total matching the 1099-DA format
• Attach a statement with transaction details

FIFO vs. other inventory methodsBy default, [Exchange] uses FIFO (First In, First Out) to calculate which specific units you sold. This means the first crypto you bought is considered the first crypto sold.Important: Your Form 8949 should use the same inventory method as [Exchange] reported on your 1099-DA. Otherwise, your cost basis won't match.Alternative methods:

• LIFO (Last In, First Out) – May reduce gains in rising markets
• HIFO (Highest In, First Out) – Minimizes taxable gains
• Specific Identification – You choose which specific units to sell

You can elect different methods, but you must:

• Document your election before the sale
• Be consistent across similar holdings
• Use adjustment codes on Form 8949 if it differs from your 1099-DA

Summ allows you to select inventory methods per account and automatically reconciles with your 1099-DA.Step 3: Using Summ (formerly Crypto Tax Calculator) for automated Form 8949Manually filling out Form 8949 is time-consuming and error-prone, especially if you have multiple transactions across different platforms. Crypto Tax Calculator automates the entire process.How CTC generates Form 8949 from your [Exchange] 1099-DA[Screenshot: CTC dashboard showing 1099-DA import feature]Step 1: Import your [Exchange] data

1. Sign up for Summ or log in
2. Navigate to Accounts and click + Add accounts
3. Select [Exchange] and connect via API or CSV upload
4. CTC imports all your transaction history automatically

Step 2: CTC reconciles with your 1099-DA[Screenshot: CTC reconciliation screen showing 1099-DA matching]Summ automatically:

• Identifies which transactions appear on your 1099-DA
• Matches proceeds amounts exactly
• Fills in missing cost basis from your complete transaction history across all platforms
• Applies the correct inventory method
• Identifies transfers vs. sales
• Calculates accurate gains and losses

Step 3: Generate Form 8949[Screenshot: Generated Form 8949 in CTC]

1. Navigate to the Reports section
2. Select your tax year (e.g., 2025)
3. Click Generate Report
4. Download your completed Form 8949

Your Form 8949 will include:

• ✅ All columns properly filled out
• ✅ Proceeds matching your 1099-DA
• ✅ Complete cost basis (even for transferred assets)
• ✅ Proper adjustment codes (Code E for missing basis)
• ✅ Correct short-term vs. long-term designations
• ✅ Accurate gain/loss calculations

Step 4: Get your complete tax package[Screenshot: CTC tax report download options]Along with Form 8949, CTC generates:

• Schedule D – Summary of capital gains/losses
• TurboTax/TaxAct files – Direct import to tax software
• Complete audit trail – Detailed transaction history supporting your cost basis
• Supporting statement – If you have many transactions, CTC creates the detailed attachment
• Prior year comparisons – If you have carryover losses

CTC's advanced reconciliation featuresMulti-exchange aggregationIf you received 1099-DAs from multiple exchanges:

• Connect all exchanges to CTC
• CTC consolidates everything on one Form 8949
• Ensures no duplicate reporting
• Properly tracks transfers between platforms

DeFi and wallet integrationYour 1099-DA won't include:

• DeFi transactions
• Wallet-to-wallet trades
• NFT sales
• On-chain staking

CTC tracks all these activities and includes them on your Form 8949, ensuring complete reporting.Automated transfer matchingWhen you transfer crypto between platforms, it's not a taxable sale—but it affects cost basis tracking. CTC automatically:

• Identifies transfers vs. sales
• Carries cost basis forward through transfers
• Prevents double-counting

Example:

• Buy Bitcoin on Coinbase for $30,000
• Transfer to [Exchange]
• Sell on [Exchange] for $40,000

Without CTC: [Exchange] 1099-DA shows $0 cost basis → you'd pay taxes on full $40,000With CTC: Form 8949 shows correct $30,000 cost basis → you pay taxes on actual $10,000 gain

• Missing transactions: Compare your 1099-DA to your downloaded transaction history—every sale should be included
• Duplicate transactions: Sometimes system errors cause double-reporting
• Wrong dates: Verify sale dates match your records
• Incorrect proceeds: Check that sale amounts match what you actually received

Step 4: Manual reconciliation and error resolution

Even with careful preparation, you may encounter discrepancies between your 1099-DA and your records. Here's how to handle some common discrepency scenarios:

Discrepancy #1: Proceeds don't match between 1099-DA and your records

Causes:

• [Exchange] reported gross proceeds, your records show net proceeds
• Currency conversion differences (if you trade internationally)
• [Exchange] system error
• You're looking at the wrong transaction

Resolution:

• Verify you're comparing the same transaction
• Check if fees were included vs. excluded
• Review your [Exchange] transaction history for the exact sale
• Report the amount on your 1099-DA in Column (d) – this is what the IRS will match
• If [Exchange] is wrong, request a corrected 1099-DA or attach an explanation

Discrepancy #2: Different dates for the same transaction

Causes:

• Time zone differences
• Trade execution date vs. settlement date
• Different transaction timestamps in your records

Resolution:

• Use the date on your 1099-DA in Column (c) – this ensures IRS matching
• For acquisition date (Column b), use your best records
• If concerned, attach a brief statement explaining any date uncertainty

Discrepancy #3: Transaction appears on 1099-DA but you don't recall it

Causes:

• Small transactions you forgot
• Dust conversions or consolidations
• Automatic conversions by [Exchange]
• Erroneous reporting by [Exchange]

Resolution:

• Log into [Exchange] and review transaction history for that date
• Check your email for transaction confirmations
• If it's legitimate but you have no cost basis records, use historical price data
• If it's an [Exchange] error, request a corrected 1099-DA

Discrepancy #4: Transaction in your records but NOT on 1099-DA

Causes:

• Transaction was on a different exchange
• It was a transfer, not a sale (not reportable on 1099-DA)
• Transaction occurred in a different tax year
• [Exchange] reporting error

Resolution:

• Verify which exchange/wallet the transaction occurred on
• Confirm it was a sale (not just a transfer)
• Check the transaction date—may be in different tax year
• If [Exchange] should have reported it but didn't, check Box C or F on Form 8949 (no 1099-DA received)

When to contact [Exchange] for a corrected form

Request a corrected 1099-DA (Form 1099-DA-C) if:

• ✅ A transaction was reported in the wrong tax year
• ✅ Proceeds amount is clearly incorrect
• ✅ A non-sale (like a transfer) was incorrectly reported as a sale
• ✅ Duplicate transactions appear
• ✅ Someone else's transaction was attributed to your account

How to request correction from [Exchange]

1. Gather evidence of the error (screenshots, transaction history)
2. Contact [Exchange] support via [specific method]
3. Request a corrected Form 1099-DA-C
4. Allow 2-4 weeks for processing

‍

If the correction doesn't arrive before the filing deadline

• File with accurate information using adjustment codes
• Attach a statement explaining the discrepancy
• Keep all documentation for potential IRS inquiry
• File the corrected 1099-DA when it arrives (may require amended return if significantly different)

Using adjustment codes to explain differences

When your Form 8949 differs from your 1099-DA, use adjustment codes and attach a supporting statement.

Statement format:

"The proceeds reported on Form 8949 match the amounts on Form 1099-DA received from [Exchange]. However, the cost basis reported on the 1099-DA was incomplete. The taxpayer has provided accurate cost basis based on complete records from all crypto transactions across multiple platforms. Supporting documentation is available upon request. Adjustment Code E is used to indicate basis not reported to the IRS."

Summ automatically generates these statements for you.

Step 5: Final review and filing checklist

Before submitting your tax return, perform these final checks.

Cross-checking totals

[Screenshot: Form 8949 summary totals and Schedule D]

Verify Form 8949 totals

1. Add up all gains and losses in Column (h)
2. Verify subtotals for Part I (short-term) and Part II (long-term)
3. Check that totals transfer correctly to Schedule D

Verify Schedule D

Form 8949 totals carry over to Schedule D:

• Part I total → Schedule D, Line 1b (short-term)
• Part II total → Schedule D, Line 8b (long-term)
• Final gain/loss → Schedule D, Line 16

Match against all 1099-DAs

If you received multiple 1099-DAs:

• Verify every 1099-DA is accounted for on Form 8949
• Add up all proceeds from all 1099-DAs
• Confirm your Form 8949 Column (d) total matches

Found an error? Check for these common math errors

Error #1: Forgetting to include negative adjustments

When using adjustment codes, make sure negative adjustments reduce your gain (or increase your loss).

Error #2: Mixing up short-term and long-term

Double-check every transaction's holding period. One year and one day is long-term. One year exactly is short-term.

Error #3: Incorrect subtotals

If you have multiple pages of Form 8949, ensure:

• Each page is properly labeled (Part I or Part II, Box A/B/C or D/E/F)
• Subtotals are correct on each page
• Final totals include all pages

Error #4: Not accounting for prior year loss carryovers

If you had net capital losses in prior years exceeding $3,000, you have carryovers. These go on Schedule D (not Form 8949) but reduce your current year tax.

Step 6: Filing your 8949 Using Tax software

Most major tax software accepts Form 8949 data. Here's how to upload it using popular applications.

TurboTax

• Go to "Wages & Income" → "Investment Income" → "Stocks, Cryptocurrency, Mutual Funds, Bonds, Other"
• Enter manually or import from Summ

TaxAct

• Navigate to "Federal" → "Income" → "Investments Income" → "Sale of Stocks, Bonds, etc."
• Import CTC file or enter manually

FreeTaxUSA

• "Federal Return" → "Income" → "Capital Gains and Losses"
• Manual entry required

H&R Block

• "Income" → "Investments and Savings" → "Stocks, Bonds, etc."
• Enter data from Form 8949

Filing a Summ Tax Report Using Software

• Summ generates files compatible with all major tax software
• Direct import saves hours of manual entry
• Automatically formats everything correctly

Get tax software-ready reports from Summ

Optional Step: Filing an amended return

You may need to file Form 1040-X (Amended Return) if:

• You discover a significant error after filing
• You receive a corrected 1099-DA after filing
• You omitted transactions that should have been reported
• Your cost basis was materially incorrect

Time limits for amendments:

• 3 years from original filing date, or
• 2 years from when you paid the tax (whichever is later)

Summ can generate amended returns with corrected Form 8949 and Schedule D.

Post-filing: what to expect and how to respond

After filing your return, here's what may happen and how to handle it.

IRS matching timeline

The IRS matching process typically takes:

• 3-6 months after filing for initial automated matching
• 6-12 months for CP2000 notices to be sent if discrepancies are found
• Up to 3 years for full audits (though crypto issues often surface sooner)

Most crypto-related issues result in CP2000 notices rather than full audits.

Understanding CP2000 notices

A CP2000 (Underreporter Inquiry) is not technically an audit, but it requires a response.

What it means:

• The IRS automated system found a mismatch between your 1099-DA and your Form 8949
• They're proposing additional tax, penalties, and interest
• You have 30 days to respond

Common reasons crypto investors receive CP2000

• Proceeds mismatch – Your Form 8949 proceeds don't match 1099-DA
• Missing cost basis – IRS assumes $0 cost basis if you didn't report it
• Unreported 1099-DA – You received a 1099-DA but didn't report those transactions

How to respond to a CP2000 notice

Step 1: Don't panic: A CP2000 is not a tax bill—it's a proposal. You can contest it with proper documentation.‍

Step 2: Review the notice carefully

• Identify which transactions triggered the notice
• Verify the IRS's proposed changes
• Check if their calculation is correct or if you have documentation proving otherwise

Step 3: Gather your documentation

• Your complete Form 8949 and Schedule D
• The 1099-DA in question
• Cost basis records supporting your reported amounts
• CTC's audit trail documentation

Step 4: Respond using Form 8949

If you have documentation supporting your reported amounts:

• Complete the response form included with the CP2000
• Check "I disagree with the proposed changes"
• Attach your supporting documentation:
  
  • Form 8949 showing complete cost basis
  • Transaction records proving acquisition prices
  • CTC's detailed audit trail
• Mail within 30 days of the notice date

Step 5: Consider professional help

If the proposed tax adjustment is substantial (over $5,000), consider hiring:

• A crypto tax professional
• An Enrolled Agent (EA)
• A CPA specializing in cryptocurrency

CTC's support team can also help you understand the notice and prepare your response.

Record retention requirements

The IRS can audit returns for up to 3 years after filing (6 years for substantial underreporting). Keep these records:

Keep for at least 3 years (preferably 6-7):

• All 1099-DA forms
• Form 8949 and Schedule D
• Complete transaction history from all exchanges and wallets
• Cost basis calculations and supporting documentation
• Email confirmations and receipts
• Bank/credit card statements showing crypto purchases
• Any correspondence with exchanges about corrections

Keep indefinitely:

• Records of crypto acquired through mining, airdrops, or forks (needed to prove cost basis when sold)
• Records of gifts given or received (affects basis for future sales)
• Records supporting loss carryforwards

Digital storage tips:

• Use secure cloud storage (Google Drive, Dropbox, etc.)
• Keep multiple backups
• Organize by tax year
• Export transaction data regularly (exchanges may delete old data)

With Summ:

• All transaction data is permanently stored
• Complete audit trail documentation is always available
• You can regenerate reports for any prior year
• No risk of losing data if an exchange shuts down

Ongoing audit support with Summ (formerly Crypto Tax Calculator)

Summ provides:

• Complete transaction documentation – Every calculation is backed by detailed records
• Audit trail reports – Show exactly how every gain/loss was calculated
• Expert support – Help understanding IRS notices and preparing responses
• Historical data preservation – Your transaction history is permanently saved
• Amended return generation – If you need to correct a prior year

Get audit-ready reports with full documentation

Take action: File your Form 8949 correctly

You now have everything you need to properly fill out Form 8949 using your [Exchange] 1099-DA. Here's your action plan:

If you choose the manual route:

1. ✅ Gather all documents (1099-DAs, cost basis records, transaction history)
2. ✅ Verify your 1099-DA accuracy and identify discrepancies
3. ✅ Fill out Form 8949 column by column following this guide
4. ✅ Double-check all proceeds match your 1099-DA
5. ✅ Transfer totals to Schedule D
6. ✅ File before April 15th deadline
7. ✅ Keep all documentation for 3-7 years

If you want accuracy and efficiency:

1. ✅ Sign up for Summ (formerly Crypto Tax Calculator)
2. ✅ Connect [Exchange] and all your other crypto accounts
3. ✅ Let CTC automatically reconcile with your 1099-DA
4. ✅ Review and download your complete Form 8949
5. ✅ Import to your tax software or file with your CPA
6. ✅ Rest easy knowing you have full audit trail documentation

Why Summ is worth it

Time savings:

• Manual Form 8949: 8-40+ hours for moderate to high transaction volumes
• With CTC: 15-30 minutes

Accuracy:

• Manual calculation: High error risk, especially with transfers between platforms
• With CTC: Professional-grade accuracy with built-in reconciliation

Audit protection:

• Manual records: You must compile and organize everything yourself
• With CTC: Complete audit trail automatically generated and stored

Cost basis tracking:

• Manual tracking: Nearly impossible across multiple platforms and DeFi
• With CTC: Automatic tracking across 3500+ platforms

Peace of mind:

• Manual filing: Hope you didn't make mistakes
• With CTC: Confidence in IRS-compliant, properly documented returns

Most importantly: The cost of using CTC (starting at $65) is typically recovered many times over through:

• Accurate loss deductions you might miss manually
• Avoiding overpayment from missing cost basis
• Preventing costly mistakes that trigger audits
• Saving 20+ hours of your time

Get your complete, accurate Form 8949 today