What Happens If You Receive an IRS Letter About Crypto Transactions?
An envelope from the IRS mentioning crypto activity tends to trigger immediate worry, but in most cases it’s a routine mismatch notice rather than an accusation of wrongdoing, and it has a fairly standard response process.
The short answer
An IRS letter about crypto transactions most often means the income or transaction data the IRS received from an exchange or broker doesn’t match what was reported on a filed return. The typical next step is reviewing the letter carefully, gathering supporting transaction records, and responding by the stated deadline, either confirming the IRS figures, providing the correct numbers, or explaining the discrepancy with documentation.
Why these letters get sent
Exchanges and brokers report certain transaction information to the IRS, and the IRS uses automated matching systems to compare that data against what taxpayers report on their own returns. When those two sources don’t line up, whether because a form wasn’t included, a figure was transposed, or a broker’s reported cost basis differs from a taxpayer’s own records, the system flags the return for a letter. This is closely related to the general challenge of tracking crypto cost basis accurately, since a lot of these mismatches trace back to incomplete basis information rather than any intentional underreporting.
What the letter usually asks for
- A specific explanation of the discrepancy. The letter typically identifies the tax year and the transactions or income figures in question, asking for either agreement with the proposed changes or an explanation of why the original return was correct.
- A response by a defined deadline. These letters come with a specific date by which a response is expected, and missing that date can result in the IRS proceeding with its proposed changes.
- Supporting documentation, if disputing the figures. Purchase records, wallet histories, and exchange statements are the kind of evidence that supports a filer’s own numbers over the IRS’s initial figures.
How to respond
Reading the letter carefully to understand exactly which tax year and which transactions are being questioned is the first step, since responses need to address the specific issue raised rather than crypto activity in general. From there, pulling together the underlying transaction records, purchase dates, sale dates, amounts, and cost basis, allows a comparison between what was reported and what the IRS believes happened. If the IRS figures turn out to be correct, the response usually involves agreeing to the change and, if applicable, paying any additional tax owed. If the original return was accurate, the response should lay out the correct figures along with documentation supporting them. Because how crypto is taxed generally is still an evolving area with rules that continue to be refined, and because these letters can occasionally touch on more serious matters, like unreported foreign exchange accounts, working with a tax professional to draft the response is often a reasonable step, particularly for anything beyond a simple, clearly explainable mismatch.
What happens if it’s ignored
Ignoring an IRS letter doesn’t make the underlying issue go away; it typically leads to the IRS proceeding with its own proposed adjustment, which can include additional tax, interest, and potentially penalties. Responding by the deadline, even if only to request more time or clarify what’s being asked, keeps the process moving in a way that leaves room to correct the record if the IRS’s information is wrong.
The takeaway
Most IRS letters flagging crypto activity are mismatch notices, not the start of an audit, and they’re generally resolved by comparing the IRS’s figures against a filer’s own transaction records and responding with whatever documentation supports the accurate numbers. Because tax rules around crypto reporting keep changing and outcomes depend on individual circumstances, treating the letter as a prompt to gather records and respond carefully, rather than something to set aside, is the more reliable path.