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Form 1099-B

The broker statement reporting sales of stocks, bonds, and other securities with proceeds and, for covered shares, cost basis.

What is Form 1099-B?

The broker statement reporting sales of stocks, bonds, and other securities with proceeds and, for covered shares, cost basis.

Why it matters on your return

For stock the basis is usually right. For RSUs it is often reported as zero because the broker does not know the value was already taxed as wages, which double-taxes the vesting amount unless corrected on Form 8949.

Example

Your 1099-B shows an RSU sale with $25,000 proceeds and $0 basis. The shares vested at $24,000, which was in your W-2. You report $24,000 basis with adjustment code B and a $1,000 gain.

Do crypto exchanges issue 1099-B?

Some did historically; since 2025 the crypto form is the 1099-DA. Treat any older 1099-B from an exchange the same way: proceeds are right, basis usually is not.

Last reviewed September 15, 2026. Tax rules change; confirm current law before acting.

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