What's different here
- Form 1099-DA. Under the final broker regulations, custodial digital-asset brokers report gross proceeds on sales and exchanges effected on or after January 1, 2025, on Form 1099-DA, and cost basis on covered transactions from January 1, 2026. Notice 2024-56 waived penalties for good-faith 2025 filings and waived backup withholding for 2025 transactions; for 2026, the backup-withholding relief applies where the broker obtained the customer's TIN and received a match from the IRS TIN Matching Program. Notice 2024-57 deferred reporting for wrapping, staking, lending, liquidity-provider and certain other transactions until further guidance.
- DeFi. The separate rule that would have treated certain non-custodial ("DeFi") front-end providers as brokers was repealed by Congress under the Congressional Review Act in 2025; non-custodial platforms are outside 1099-DA reporting unless new rules are issued.
- TIN collection is the whole game. The IRS's withholding relief is conditioned on a TIN that has been submitted to TIN Matching and matched. A platform that collected TINs but never matched them has no relief, and 24% backup withholding on gross proceeds from digital-asset sales is operationally brutal (it comes out of the sale, in kind or in cash).
- Which regime for which flow. A payment platform settling transactions for merchants is a payment settlement entity (1099-K at $20,000 / 200 transactions). A platform paying creators or contractors is a 1099-NEC payer. A neobank or yield product paying interest is a 1099-INT payer. A crypto exchange is a 1099-DA broker. Many fintechs are two or three of these at once, and the vendor master, the payout ledger and the customer base each need their own TIN discipline.
- KYC and TIN are not the same check. Identity verification confirms a person exists and matches an ID; TIN matching confirms the name/TIN pair exists in IRS records. Synthetic identities pass one and fail the other, which is why doing both at onboarding is the fraud control as well as the tax control.
- Foreign customers document with a W-8 and are generally outside 1099-DA and 1099-K, but sourcing and chapter 3 withholding can apply to interest and other FDAP income.
The newest form in the system is already the second largest, and its backup withholding relief depends on a TIN match.
The forms a platform files
| Form | What it covers here | Threshold (2026 payments) | To the IRS | The trap in this sector |
|---|---|---|---|---|
| 1099-DA | Gross proceeds from digital asset sales effected by a custodial broker from 2025; basis on covered assets from 2026 | Any amount | February 28 paper, March 31 electronic; customer copy February 15 | Notice 2024-56 waived backup withholding for 2025; for 2026 the relief applies only where the broker submitted the TIN to TIN Matching and received a match. Non-custodial platforms are out after Congress repealed the DeFi broker rule in 2025. |
| 1099-K | Payments settled for merchants and sellers by a payment settlement entity | $20,000 and 200 transactions (restored by Pub. L. 119-21) | February 28 on paper, March 31 electronically; recipient copy January 31 | The gross amount the buyer paid, not the net payout (PLR 201719009); one processed payment is one transaction (PLR 201907006). |
| 1099-NEC | Creators, contractors and gig workers paid by the platform for services | $2,000 | January 31 (next business day if a weekend); no automatic extension | A payment reportable under 6050W is not also reported under 6041 (PLR 202112002); decide which regime a flow is in before building either. |
| 1099-MISC box 3 | Promotions, referral bonuses, staking and reward income paid by the platform | $2,000 | February 28 on paper, March 31 electronically; recipient copy January 31 | Reward income is reportable when the customer has dominion over it (Rev. Rul. 2023-14); broker reporting of staking transactions on 1099-DA is deferred by Notice 2024-57. |
| 1099-INT | Interest on cash balances and yield products paid as interest | $10 | February 28 on paper, March 31 electronically; recipient copy January 31 | Backup withholding from the first dollar on an uncertified account; the signup W-9 is the control. |
| Form 8300 | Digital assets received as payment of more than $10,000 | $10,000 | 15 days | Section 6050I covers digital assets since 2024 but the IRS has said no filing is required until regulations issue (Announcement 2024-4); Carman v. Yellen (below) is the pending challenge. |
| 1042-S | Interest and other FDAP income paid to foreign customers documented on W-8 | None | March 15 | A U.S. address or phone number on a W-8BEN account is a reason to know; the FATCA guide covers the account-holder side. |
Backup withholding on a platform is a ledger feature, not a year-end report: 24 percent of gross proceeds on a 1099-DA sale, of the settlement on a 1099-K merchant, or of the payout to a 1099-NEC creator, deposited and reconciled on Form 945. Peretz (below) is what happens to a customer who does not understand the refund clock the withholding started.
Where a platform's notices come from
- Display names. KYC verified a passport; the W-9 line 1 was filled from the profile name. The IRS compares the name control of line 1 to the TIN, and 'Mike' is not 'Michael' when the surname is also shortened; the name control calculator shows what survives.
- Entity accounts opened by individuals. A founder opens the company account with her SSN; the 1099-K or 1099-DA goes out under the company name and her number. Nurumbi (below) is the mirror image: a driver who wanted his LLC to report got a 1099-K in his own name because that is the W-9 he gave.
- ITINs and new SSNs. A customer who gave an ITIN at signup and later got an SSN, or a resident alien whose W-8BEN should have become a W-9; the ITIN guide covers the transitions.
- Synthetic identities. A real SSN with a fabricated name passes document checks and fails the IRS match; the match is the fraud control, which is why the IRS tied the 1099-DA withholding relief to it.
- Volume. A platform with millions of customers receives its CP2100 as a file, not a letter, and the 15-business-day B-Notice clock runs on all of it; the CP2100 guide and the deadline calculator cover the mechanics.
The checks that sit on top of the TIN
| Check | Source | When | What a failure means |
|---|---|---|---|
| Name/TIN match | IRS TIN Matching Program; the match result and date stored on the account | At signup, before funding; bulk match of the existing base before each filing cycle | No backup withholding relief on 1099-DA sales; a CP2100 line; 24 percent out of the next sale |
| Identity (KYC/CIP) | Document verification, liveness, database checks under the platform's BSA program | At signup | An account that exists for a person who does not; passes without the TIN match |
| Sanctions | OFAC SDN list, including designated digital asset addresses and mixers | At signup, on list updates and at transaction screening | A blocked account and an OFAC report; see the screening guide and the twelve fintech and digital asset cases in the OFAC enforcement action finder (IP geoblocking at signup but not at trade time, Crimea missing from the block list, pended payments auto-released during backlogs) |
| U.S. status | W-9 or W-8; U.S. indicia review for W-8 accounts (address, phone, standing instructions) | At signup and when indicia change | A foreign-documented account that should be in the 1099 system, or a U.S. account in the 1042-S one |
| Regime classification | Which flow is 6045 (DA), 6050W (K), 6041 (NEC, MISC) or 6049 (INT) | At product design | The right TIN on the wrong form, or two forms for one payment |
Design points
- Collect the W-9 electronically at signup with the certification text and e-signature, and match the name/TIN pair by API before the account is funded; store the match result and date as evidence for the withholding relief.
- For existing customers, run a bulk match of the whole base and solicit corrections before the next 1099-DA/1099-K/1099-INT cycle.
- Model backup withholding as a ledger feature (a withholding flag on the account, applied at disposition or payout), not a year-end report.
- Keep the sanctions screen on the same customer record; OFAC has designated digital-asset addresses and mixers, and screening customers is table stakes.
- Track the notice landscape: the 1099-DA rules are still being phased in, and the transition relief has dates.
A worked example: the base that was never matched
An exchange with 2.4 million U.S. customers collected a W-9 from each at signup and never submitted the file to TIN Matching. For 2026 it must report gross proceeds and basis on Form 1099-DA and the withholding relief in Notice 2024-56 applies only to customers whose TINs it matched.
A bulk match in October returns 144,000 mismatches, 6 percent. The exchange has three months to solicit corrections (the solicitation rules set what counts) and must backup withhold 24 percent of gross proceeds on every sale by a customer still unmatched on January 1, taking it in kind or from cash balances and depositing it on Form 945. The spring CP2100 will list whatever is left, and the 972CG proposes those returns at $340 each, capped at $4,191,500 and capped again under 6722.
The signup W-9s with dates are the initial solicitation; the October campaign and the B-Notices are the annual solicitations; together they are the reasonable cause record under Reg. 301.6724-1. What they do not recover is the withholding relief the exchange could have had by matching in 2025.
Annual maximum at the $340 rate: $4,191,500, or $1,397,000 for a filer with average gross receipts of $5 million or less. Section 6722 charges the same amounts again for the payee statements. Returns due in 2027, Rev. Proc. 2025-32. Full tables: the 972CG estimator and the figures page.
Questions platforms ask
We verified identity documents for every customer. Why match TINs too?
Because the IRS match is a different test. KYC confirms a document and a face; TIN Matching confirms that the name and number pair exists in IRS records. The 1099-DA withholding relief for 2026 is conditioned on the match, not on KYC, and a synthetic identity passes the first and fails the second.
Are we a TPSO or a 1099-NEC payer for the people we pay?
If you contract with the sellers, settle the buyers' payments and guarantee payment, you are a third party settlement organization and the payment is a 1099-K item at $20,000 and 200 transactions (PLRs 201719009, 201907006). If you are paying for services rendered to you, it is a 1099-NEC. A payment reportable under 6050W is not also reported under 6041. The 1099-K topic in the finder has every ruling.
A customer gave us a W-8BEN but logs in from a U.S. address. Do we rely on it?
Not without curing the indicia. A U.S. address or phone on a W-8BEN account is a reason to know unless the customer explains it in writing or supplies a certificate of residence; the foreign payee guide and the validity calculator cover the cure and the expiry.
Do we file Form 8300 for a $15,000 payment received in crypto?
Not yet. Section 6050I has covered digital assets since 2024, but the IRS announced that no filing is required until regulations issue (Announcement 2024-4) and the rule is under constitutional challenge in Carman v. Yellen. Watch the regulations; keep the records.
We backup withheld in kind from a customer's sale. Can we give it back when the W-9 arrives?
No. Deposited withholding is the customer's credit on their return, recoverable only by a timely return or claim (Peretz). Stop withholding on the next transaction, report the amount in box 4 and tell the customer about the clock.
Our customer wants the 1099-K in his LLC's name after the year closed.
The form follows the W-9 on file when the payments were made (Nurumbi). Correct it only if the account was documented in the LLC's name and the form is wrong; otherwise the customer gives you the LLC's W-9 for next year.
What the IRS and the courts have said about platforms
- Carman v. Yellen, 112 F.4th 386 (6th Cir. 2024): the constitutional challenge to treating digital assets as cash for Form 8300 is ripe and goes forward on the Fourth and First Amendment and enumerated-powers claims; no ruling on the merits, and the IRS has said no filing is required until regulations issue.
- Nurumbi v. Commissioner, T.C. Memo. 2021-79 (docket record): Uber's 1099-K and 1099-MISC under a driver's own name and SSN, backed by weekly statements and bank deposits, fixed $542,420 of income on him although he had routed it to an LLC; the W-9 the platform holds decides whose return the income lands on.
- Private Letter Ruling 201719009: a marketplace with more than 50 sellers that collects buyers' payments and pays sellers net of fees is a TPSO, and the 1099-K shows the gross amount buyers paid, fees included.
- Private Letter Ruling 201907006: a software company processing card and ACH payments to its customer organizations under payment guarantees is a TPSO; each successfully processed payment is one transaction, however often the company remits.
- Private Letter Ruling 201836008: a booking platform is a TPSO if it is not the providers' common law employer; each service sold is one transaction even when several people pay for it, and worker classification was expressly left open.
- Private Letter Ruling 201604003: the platform that sees the gross transaction and deducts its fees is the settlement entity that files the 1099-K, not a payout processor downstream that only sees the net.
- Private Letter Ruling 201240005: a U.S. tax-reporting designee for a foreign payment settlement entity may rely on the payor's foreign-status determinations and is not liable for failures caused by the payor's missing documentation; the payor is.
- Peretz v. United States (Fed. Cl. 2020): $121,288 a broker backup withheld from a nonresident alien's sale proceeds was recoverable only by a timely claim; withholding is deemed paid on April 15 of the next year and the look-back ran. Withholding in kind from proceeds puts the customer on a clock.
- Florida Bankers Association v. U.S. Department of the Treasury, 799 F.3d 1065 (D.C. Cir. 2015): an information reporting rule cannot be challenged before enforcement because the 6721 penalty is treated as a tax; a broker that objects to the 1099-DA rules files, or refuses and litigates the penalty after paying it.
The 1099-K and platforms and Form 8300 topics of the finder hold the series of TPSO rulings; TIGTA's digital asset reports (2020-30-066 and its successors) are on the oversight page, and the IRSAC's asks on 1099-DA electronic delivery and 1099-K definitions are in the advisory tracker.