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Home / Form 8949 adjustment codes for crypto

CryptoForms and schedules

Form 8949 adjustment codes for crypto

The letter codes in column (f) of Form 8949 that explain why your reported basis or gain differs from what a broker reported.

What is Form 8949 adjustment codes for crypto?

The letter codes in column (f) of Form 8949 that explain why your reported basis or gain differs from what a broker reported.

Why it matters on your return

Three codes do most of the crypto work. Code B: the broker's basis is wrong or missing and you are correcting it. Code T: the broker's holding period is wrong. Code W: a wash sale (applies to crypto ETFs, not directly held coins). Using the codes tells the IRS matching system that a difference is deliberate and documented rather than an omission.

Example

Your 1099-DA reports a sale with $0 basis. On Form 8949 you enter the proceeds as reported, your actual $40,000 basis, code B in column (f), and the $40,000 adjustment in column (g).

Which Form 8949 code do I use when my 1099-DA has no cost basis?

Code B, with the correct basis in column (e) and the adjustment amount in column (g). Keep the records that support the basis.

Source: IRS Form 8949 instructions

Last reviewed September 18, 2026. Tax rules change; confirm current law before acting.

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Form 8949 adjustment codes for crypto

What is Form 8949 adjustment codes for crypto?

Why it matters on your return

Example

Which Form 8949 code do I use when my 1099-DA has no cost basis?

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