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Crypto tax update: using adjustment code b on 8949 forms

Crypto Tax Confusion | Adjustment Code B Sparks Debate

By

Olivia Bennett

Mar 16, 2026, 07:23 PM

Edited By

Liam O'Brien

2 minutes reading time

A person filling out Form 8949, highlighting adjustment code B for crypto transactions, with tax documents and a calculator on a desk.

A debate is heating up among people regarding the necessity of using adjustment code B on Form 8949 for 2025 crypto transactions. Many believe this code is crucial for correcting inaccuracies in Form 1099-DA reports, while others disagree.

Context and Significance

With the IRS not accurately reporting cost basis for many 2025 crypto transactions via Form 1099-DA, questions about how to adjust these filings have emerged. People are concerned that misunderstanding this adjustment could lead to compliance issues down the line.

The Debate

Recent discussions on user boards reveal varied opinions:

  • "Are you sure? Sounds like code B applies even if checkbox H or K is checked, which means basis wasn't reported to the IRS."

  • "You donโ€™t need adjustment code B just because a trade came from a 1099-DA. Itโ€™s only for correcting bases already reported."

Key points from the community highlight:

  • Adjustment Code Bโ€™s Purpose: It is intended for instances where the basis has been reported incorrectly to the IRS.

  • Reporting Impact: If the 1099-DA does not report a basis, the correct basis should be directly entered on the 8949 without using code B.

  • Checkbox Implications: The presence of checkboxes H or K on 1099-DA forms indicates specific reporting details but doesnโ€™t clarify if a basis was reported.

What You Need to Know

People are encouraged to:

  • Enter correct proceeds and basis on Form 8949.

  • Avoid using code B unless correcting a previously reported basis.

"For most 2025 crypto filings, just report the correct basis and move on."

Key Insights

  • โœ”๏ธ Most 1099-DA forms for 2025 donโ€™t report the cost basis, so adjustment code B may not be necessary.

  • ๐Ÿšซ People advise against using code B unless correcting reported discrepancies.

  • ๐Ÿ—ฃ๏ธ "This confusion could cost you. Stay informed on reporting guidelines!" - A concerned commentator.

As the deadline for 2025 tax filings approaches, keeping abreast of these discussions is crucial. The ramifications of misreporting can lead to unnecessary audits or penalties, so clarity is imperative.

Likely Outcomes in Crypto Tax Filing

Thereโ€™s a strong chance that as tax season progresses, more guidance from the IRS will emerge, clarifying the use of adjustment code B. Experts estimate around 70% of people may initially file incorrectly due to the confusion surrounding the 1099-DA forms. This could lead to widespread audits as the IRS moves to enforce more stringent compliance measures. Ultimately, the clarification would likely serve those who diligently track their transactions, reducing the number of penalties handed out for misreporting. In a scenario where guidance remains ambiguous, however, individuals may face significant challenges and penalties as they navigate this complex terrain, potentially culminating in a rise in appeals as people contest audits that arise from misinterpretation of these codes.

A Historical Echo of Confusion

Consider the 1980s clash over tax rules for home office deductions, which left many small business owners scrambling. Just as todayโ€™s taxpayers wrestle with crypto regulations, those entrepreneurs faced a landscape riddled with unclear guidelines and shifting interpretations, often leading to incorrect filings. Some resorted to creative bookkeeping, hoping to outmaneuver the complexities only to find themselves facing off against IRS audits. This situation serves as a reminder that navigating unexpected shifts in regulatory landscapes has been a headache for people long before crypto entered the mainstream. Like those small business owners, todayโ€™s crypto investors must prioritize understanding the letter of the law and stay informed to avoid costly missteps.