The IRS's phased rollout of Form 1099-DA means cryptocurrency brokers reported gross proceeds for 2025 sales but were not required to report cost basis. Without supplying the missing cost basis on your return, the IRS may treat your basis as $0 — potentially taxing your entire sale proceeds as capital gain. This guide explains why the field is blank, how to reconstruct your purchase history through legally recognized methods, and how to complete Form 8949 using Box H (short-term) or Box K (long-term) to avoid a potentially significant overpayment.
Regulatory anchor: IRS Final Regulations FS-2024-23 (Treasury Decision 10000) | Gross proceeds: effective January 1, 2025 | Cost basis: effective January 1, 2026 for "covered securities" (assets acquired through and held at the same broker on or after that date)
| Item | Detail |
|---|---|
| Primary regulation | IRS Final Regulations FS-2024-23 / Treasury Decision 10000 (2024) |
| Gross proceeds reporting | Mandatory for brokers — effective January 1, 2025 |
| Cost basis reporting | Mandatory — effective January 1, 2026, for "covered securities" only: assets acquired through and continuously held at the same broker on or after that date. Assets transferred from other wallets or brokers are noncovered — basis reporting not required. |
| Risk if basis not supplied | IRS may default to $0 basis; proceeds potentially taxed as capital gain in full |
| Fix: short-term sales (held < 1 year) | Form 8949, Box H |
| Fix: long-term sales (held ≥ 1 year) | Form 8949, Box K |
| Reconstruction sources | CoinMarketCap, CoinGecko historical data; Etherscan; original exchange CSV exports |
| Kraken 1099-DA delay | Issued March 13, 2026 (per Kraken public disclosure; verify at Kraken's U.S. Tax Center FAQ) — IRS Notice 2024-56 extended broker deadline was February 17, 2026 |
| Safe harbor change | Rev. Proc. 2024-28 eliminated universal allocation; wallet-by-wallet tracking now required |
| DeFi transaction deferrals | Six categories deferred from broker reporting per IRS Notice 2024-57 — taxpayer self-reporting still required for all taxable events |
⚠️ IMPORTANT — Read Before Acting: This article is for general informational and educational purposes only. It does not constitute financial, investment, tax, or legal advice. Tax rules are complex and fact-specific. Always consult a qualified CPA, Enrolled Agent, or licensed tax attorney before making any filing decision.
Why Your 1099-DA Cost Basis Field Is Blank
If you opened your Form 1099-DA from Coinbase, Kraken, or Binance.US and found the cost basis field completely empty, this is not an exchange error.
Under IRS Final Regulations FS-2024-23 (Treasury Decision 10000, issued August 2024), brokers were required to begin reporting gross proceeds on Form 1099-DA for transactions effected on or after January 1, 2025. However, the obligation to report cost basis was not mandated until January 1, 2026 — and even then, only for "covered securities": assets that were acquired through, and continuously held at, the same broker on or after that date. Assets transferred in from another wallet or broker are noncovered, and basis reporting is not required for those even after 2026.
The result: your 2025 sale proceeds appear on a 1099-DA, but the cost basis field is blank or shows $0 for most holdings. The IRS has a record of what you received. Under existing tax law, the responsibility for supplying the missing cost basis falls on you — not the exchange. Consult a CPA or Enrolled Agent to confirm how this applies to your specific situation.
The Financial Risk of Filing Without Cost Basis
When the IRS receives a 1099-DA reporting $50,000 in gross proceeds, it expects a matching entry on Schedule D. If the corresponding Form 8949 does not supply a cost basis, the IRS processing system may default to $0 — causing the entire $50,000 to be treated as a taxable capital gain.
Illustrative example (not tax advice — individual results vary):
| Scenario | Amount |
|---|---|
| Original ETH purchase price (3 ETH, 2023) | $15,000 |
| Sale proceeds (2025) | $20,000 |
| Correct taxable gain | $5,000 |
| Gain if basis omitted (IRS default $0) | $20,000 |
| Excess tax at 22% federal rate (illustrative) | ~$3,300 overpayment |
🚨 Note on safe harbor change: Rev. Proc. 2024-28 eliminated the universal allocation safe harbor that previously allowed taxpayers to select cost basis accounting methods across wallets. Wallet-by-wallet, account-by-account tracking is now required. This creates an ongoing recordkeeping obligation for all digital asset holders.
Step 1 — Audit Every 1099-DA You Receive
Before filing, review each 1099-DA field carefully:
- Box 1b — Date acquired: For assets transferred from self-custody wallets, this field may reflect the transfer date — not your original purchase date. An incorrect acquisition date can misclassify a long-term holding as short-term, raising your effective tax rate significantly.
- Box 1e — Cost or adjusted basis: If blank or $0 for assets you originally purchased at a price above $0, the taxpayer is responsible for supplying the correct basis on Form 8949. Consult a CPA or Enrolled Agent regarding your specific filing obligations.
- Box 1g — Adjustments: Review for any disallowance codes. Note: cryptocurrency wash sale rules remain proposed as of March 2026 — they have not been enacted into law. Do not apply wash sale adjustments to crypto transactions unless legislatively enacted and confirmed by a tax professional.
- Box 2 — Long-term / short-term indicator: Verify this matches your actual holding period based on the correct acquisition date, not the transfer date.
Step 2 — Reconstruct Your Purchase Records
The IRS does not require perfect records where records are genuinely unavailable — it requires good-faith, documented estimates supported by the best available evidence. Use the following hierarchy from strongest to weakest:
- Original exchange transaction CSV exports — Download your complete trade history from every platform used. Exchange data retention policies vary — verify your specific exchange's records policy directly, as some retain data for several years while others may have shorter retention windows. This is the strongest available evidence.
- Trade confirmation emails — Email receipts contain exact purchase price, quantity, and timestamp. Search your inbox for exchange confirmation emails going back to your first purchase.
- Bank and credit card statements — Funding transfer amounts and dates establish purchase price by correlation when direct transaction records are unavailable.
- Historical price data — CoinMarketCap and CoinGecko both provide publicly available historical OHLC price data by exact date. Using the closing or daily average price on your documented purchase date is a widely used estimation methodology in tax practice for digital assets. Note: the IRS has not formally endorsed these specific platforms by name in published guidance; their use represents an accepted practitioner approach, not an officially mandated method. Confirm with your tax professional.
- Blockchain explorer records — Etherscan (Ethereum), blockchain.com (Bitcoin), and equivalent explorers provide immutable on-chain transaction timestamps with wallet addresses. Particularly valuable for DeFi transactions not captured by centralized exchanges.
💡 Defunct exchanges: If you held assets on an exchange that subsequently closed (e.g., platforms that became insolvent in 2022–2024), prepare a written methodology statement documenting your reconstruction approach. Attach this statement to your return. The IRS generally evaluates reasonable-cause arguments favorably when taxpayers demonstrate systematic, documented good-faith efforts to reconstruct records — though outcomes vary by examiner and circumstance; consult a CPA or tax attorney for high-value situations.
Step 3 — Complete Form 8949 Correctly
Form 8949 (Sales and Other Dispositions of Capital Assets) is how you report each digital asset sale and supply the reconstructed cost basis the broker didn't. For 2025 transactions where basis was not reported to the IRS by the broker, use:
| Checkbox | When to Use | Holding Period | Flows To |
|---|---|---|---|
| Box H | Basis NOT reported to IRS by broker | Short-term — held less than 1 year | Schedule D, Part I |
| Box K | Basis NOT reported to IRS by broker | Long-term — held 1 year or more | Schedule D, Part II |
| Box E | Basis WAS reported to IRS | Short-term | Schedule D, Part I |
| Box F | Basis WAS reported to IRS | Long-term | Schedule D, Part II |
Key columns for each transaction:
| Column | What to Enter |
|---|---|
| (a) Description | Token name and quantity (e.g., "0.5 BTC") |
| (b) Date acquired | Original purchase date — verified from records |
| (c) Date sold | Sale date from 1099-DA |
| (d) Proceeds | Gross proceeds from Box 1d of Form 1099-DA |
| (e) Cost basis | Your reconstructed purchase cost — attach supporting statement if reconstructed |
| (h) Gain or loss | Column (d) minus column (e), adjusted for any Column (g) amounts |
Widely used crypto tax tools — including CoinTracker, Koinly, and TaxBit — can aggregate transaction history and pre-populate Form 8949 in many cases. The IRS does not formally endorse or approve any specific third-party software. You remain legally responsible for verifying all software-generated outputs. These tools do not constitute tax advice and do not replace a qualified tax professional.
Step 4 — The Kraken Delay: Your Options
Kraken confirmed their 2025 Form 1099-DAs were not issued until March 13, 2026 (per Kraken public disclosure; verify current status at Kraken's U.S. Tax Center FAQ) — several weeks past the extended February 17, 2026 deadline established under IRS Notice 2024-56.
If you have already filed, or need to file before receiving your Kraken 1099-DA:
| Option | Description | Key Consideration |
|---|---|---|
| Option A — Amend | File Form 1040-X after receiving the 1099-DA | Use if discrepancies are material — consult a CPA or Enrolled Agent to determine whether amendment is warranted in your specific situation |
| Option B — Extension | File Form 4868 by April 15 | Extends filing to October 15 — does NOT extend payment deadline. Estimate and pay taxes owed by April 15. Consult a CPA or Enrolled Agent regarding underpayment penalty rules if your estimate is significantly understated. |
| Option C — File and monitor | File using best reconstruction; amend if needed | Acceptable if reconstruction is thorough and documented |
The appropriate option depends on your specific tax situation. Consult a CPA or Enrolled Agent before deciding.
What Changes in 2026 and Beyond
Starting January 1, 2026, brokers must report cost basis on Form 1099-DA — but only for assets bought after that date. Pre-2026 holdings stay on you indefinitely, until you sell them.
Six deferred transaction categories under IRS Notice 2024-57 — transaction types for which brokers are not required to file Form 1099-DA or furnish payee statements until the IRS and Treasury issue further guidance (source: IRS Notice 2024-57; IRS.gov; confirmed by IRS Final Regulations page):
- Wrapping and unwrapping transactions (e.g., ETH ↔ WETH, BTC ↔ WBTC)
- Liquidity provider (LP) transactions (adding/removing liquidity; minting/burning LP tokens)
- Staking transactions (including on-chain staking, liquid staking, restaking)
- Lending of digital assets (as described in Notice 2024-57)
- Short sales of digital assets (as described in Notice 2024-57)
- Notional principal contract (NPC) transactions (including certain perpetual futures and derivative arrangements)
Important notes: (1) These are broker reporting deferrals only — all taxable events in these categories remain fully reportable by taxpayers on Form 8949. (2) Non-custodial DeFi broker reporting obligations were separately overturned by Congress via the Congressional Review Act in early 2025, meaning only custodial brokers remain subject to Form 1099-DA reporting as of the 2025 tax year. (3) The IRS may revise these categories in future guidance — verify current status at IRS.gov or with a CPA or Enrolled Agent.
Even for these exempt transactions, all taxable dispositions must still be self-reported on your return. The exemption applies to broker reporting obligations — not to taxpayer reporting obligations.
Action Checklist
- [ ] Download complete transaction history (CSV) from every exchange used in 2025
- [ ] Identify every 1099-DA where Box 1e (cost basis) is blank or $0
- [ ] Verify Box 1b acquisition dates are original purchase dates — not transfer dates
- [ ] Reconstruct missing basis using CoinMarketCap or CoinGecko historical data; document methodology
- [ ] Complete Form 8949: Box H for short-term, Box K for long-term (basis not reported to IRS)
- [ ] If Kraken 1099-DA not yet received, consider Form 4868 extension before April 15
- [ ] Consult a CPA or Enrolled Agent for DeFi, multi-exchange, or high-value situations (>$10,000)
Frequently Asked Questions
Is a blank cost basis field on a 1099-DA legal — or is the exchange at fault?
The blank field is fully compliant with IRS rules for 2025. Under FS-2024-23, brokers were required to report gross proceeds but were not required to report cost basis for transactions in the 2025 tax year. The exchange has met its legal obligation. Under existing U.S. tax law, taxpayers bear responsibility for reporting their own cost basis on Form 8949 when brokers have not reported it — consult a CPA or Enrolled Agent to confirm how this applies to your specific return.
What actually happens if I file with $0 cost basis?
The IRS may issue a CP2000 notice proposing additional tax based on treating the full proceeds as gain, or may accept the return as filed and calculate the deficiency. Either way, the result is a potentially significant tax bill plus possible penalties and interest. Supplying reconstructed basis is far preferable to leaving the field blank.
Can I use crypto tax software to generate Form 8949?
Yes. CoinTracker, Koinly, and TaxBit are widely used. You remain legally responsible for verifying all outputs for accuracy. Software does not audit source data — errors in your transaction import will produce errors in your Form 8949. These tools do not constitute professional tax advice.
What if I genuinely have no records of my original purchase price?
Use the closing price on CoinMarketCap or CoinGecko for the date you believe you made the purchase, or the earliest date you can document ownership. Write a methodology statement explaining what evidence you have, what price source you used, and why. Attach it to your return. A documented, good-faith estimate is more defensible in an IRS audit than an unsupported $0 entry.
Do DeFi and NFT transactions trigger 1099-DA reporting?
Under IRS Notice 2024-57, six specific transaction categories are deferred from broker 1099-DA reporting until further IRS guidance: wrapping/unwrapping, liquidity provider transactions, staking, lending, short sales, and notional principal contracts. Separately, non-custodial DeFi broker reporting obligations under the final regulations were overturned by Congress via the Congressional Review Act in early 2025 — only custodial brokers remain subject to Form 1099-DA for 2025 and 2026. However, all taxable disposal events remain fully reportable by taxpayers regardless of whether a 1099-DA is issued. Consult a CPA or Enrolled Agent for guidance on your specific DeFi or NFT activities.
⚠️ Legal Disclaimer: This article is published for general informational and educational purposes only. It does not constitute financial, investment, tax, or legal advice, and should not be relied upon as such. Tax laws are complex, jurisdiction-specific, and subject to change. All information reflects publicly available regulatory guidance as of March 2026 and may not be current at time of reading. Individual tax situations vary significantly — outcomes described are illustrative only. The publisher assumes no liability for any financial loss, tax assessment, penalty, or legal consequence arising from use of this content. Always consult a qualified CPA, Enrolled Agent, or licensed tax attorney before making any filing or financial decision.
Sources and References
| # | Source | URL |
|---|---|---|
| 1 | Federal Register — Treasury Decision 10000: Gross Proceeds and Basis Reporting by Brokers (Digital Assets) | https://www.federalregister.gov/documents/2024/07/09/2024-14004/gross-proceeds-and-basis-reporting-by-brokers-and-determination-of-amount-realized-and-basis-for |
| 2 | IRS — FS-2024-23: Final Regulations and Related IRS Guidance for Broker Reporting on Digital Assets | https://www.irs.gov/newsroom/final-regulations-and-related-irs-guidance-for-reporting-by-brokers-on-sales-and-exchanges-of-digital-assets |
| 3 | IRS — About Form 1099-DA, Digital Asset Proceeds from Broker Transactions | https://www.irs.gov/forms-pubs/about-form-1099-da |
| 4 | IRS — About Form 8949, Sales and Other Dispositions of Capital Assets | https://www.irs.gov/forms-pubs/about-form-8949 |
| 5 | IRS — Rev. Proc. 2024-28: Digital Asset Cost Basis Accounting Methods | https://www.irs.gov/pub/irs-drop/rp-24-28.pdf |
| 6 | IRS — Notice 2024-56: Extended Transition Relief for Brokers | https://www.irs.gov/pub/irs-drop/n-24-56.pdf |
| 7 | IRS — Publication 544: Sales and Other Dispositions of Assets | https://www.irs.gov/publications/p544 |
| 8 | IRS — Publication 551: Basis of Assets | https://www.irs.gov/publications/p551 |
| 9 | CoinMarketCap — Historical OHLC Price Data | https://coinmarketcap.com/historical |
| 10 | CoinGecko — Historical Market Data | https://www.coingecko.com |
| 11 | Etherscan — Ethereum Blockchain Explorer | https://etherscan.io |
| 12 | IRS — Notice 2024-57: Deferred Transactions for Digital Asset Broker Reporting | https://www.irs.gov/pub/irs-drop/n-24-57.pdf |
| 13 | Kraken — U.S. Tax Center FAQ (1099-DA delivery status) | https://support.kraken.com/articles/us-tax-center-faq |
Last reviewed: March 2026 | Regulatory basis: IRS FS-2024-23 / Treasury Decision 10000 / Rev. Proc. 2024-28 / IRS Notice 2024-56 | Geographic scope: U.S. federal tax only — state and local tax treatment of digital assets varies; consult a tax professional in your state | IRS Notice 2024-56 deadline mapping: the February 17, 2026 deadline referenced represents the extended transition relief period; confirm current deadlines with a CPA or EA at time of filing
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