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The IRS has been matching cryptocurrency transaction records to taxpayer identities since 2016. The method has changed significantly, from court-ordered exchange subpoenas to automated Form 1099-DA matching, but the enforcement goal has not: identify who traded crypto, confirm what was reported, and pursue what was not.
If you received a letter from the IRS referencing cryptocurrency or digital asset activity, or if you traded crypto across multiple exchanges and wallets and know the reporting was not complete, your next move matters.
Your options change depending on whether the IRS has already contacted you, whether the relevant tax years are still open, and whether the non-reporting was accidental or deliberate.
The tax attorneys at Cumberland Law Group, with offices in Atlanta, GA and across North Carolina in Raleigh, Charlotte, and Durham, represent clients at every stage of IRS crypto enforcement, from soft warning letters through CP2000 notices, full examinations, voluntary disclosure, and criminal tax defense.
If you received IRS Letter 6173, Letter 6174, Letter 6174-A, a CP2000 notice, or an audit notice involving cryptocurrency, call Cumberland Law Group at (800) 960-5359 for a free consultation before responding.
The Three IRS Crypto Letters: What the IRS Is Telling You
The IRS has issued several waves of crypto-specific enforcement letters since 2019. The letters come in three main forms, and the differences between them are not cosmetic.
Letter 6174
Letter 6174 is the least severe of the three. The IRS knows you have or had cryptocurrency and is reminding you that digital asset income must be reported correctly.
No immediate response is usually required. But the letter functions as a documented warning. If your returns were not correct, the IRS has now put you on notice, which may affect the willfulness analysis if enforcement escalates later.
Letter 6174-A
Letter 6174-A is more serious. The IRS has specific information about your cryptocurrency activity, not just general knowledge that you own digital assets.
No mandatory response may be required, but the specificity of the language can signal that the IRS has exchange data that may not reconcile against your filed return. Tax practitioners often treat Letter 6174-A as a pre-audit notice that warrants immediate return review.
Letter 6173
Letter 6173 is the most serious of the three. The IRS states it has information suggesting that you failed to meet tax filing or reporting obligations for virtual currency transactions.
Letter 6173 requires a response. The taxpayer must generally do one of three things by the stated deadline:
- Certify, under penalty of perjury, that all cryptocurrency transactions were properly reported and no additional tax is owed
- File amended returns correcting any underreporting and pay the associated tax, interest, and penalties
- Provide an explanation for why no amendment is required
Certifying compliance when your returns are incorrect can create false statement exposure on top of the underlying crypto tax issue. Letter 6173 is where representation should begin, not after a response has already been submitted.
The IRS explains that its virtual currency letter campaign includes Letters 6173, 6174, and 6174-A, all designed to address potential noncompliance involving cryptocurrency transactions.
How the IRS Found You: Three Enforcement Mechanisms Running at the Same Time
IRS crypto enforcement is not based on guesswork. The agency uses exchange records, third-party reporting, blockchain analytics, and automated matching to identify taxpayers whose digital asset activity may not match their filed returns.
1. John Doe Summonses
A John Doe summons is a court-authorized IRS demand for information about an entire class of unidentified taxpayers. The IRS does not need to suspect one specific person. It needs a reasonable basis to believe that a class of people, such as exchange users over a transaction threshold, may include taxpayers who underreported income.
The first major crypto John Doe summons was served on Coinbase in 2016 and covered transactions from 2013 through 2015. After litigation, Coinbase produced records on thousands of U.S. accounts.
Subsequent summonses and enforcement efforts involved other exchanges and platforms, including Kraken, Poloniex, Circle, and others. These summonses can require disclosure of names, taxpayer identification numbers, addresses, email addresses, wallet addresses, and transaction records.
Every taxpayer whose account met the relevant transaction thresholds may have data in IRS possession, even if no IRS letter has arrived yet.
2. Blockchain Analytics
The IRS and IRS Criminal Investigation use blockchain analytics tools to trace on-chain transaction histories. These tools can connect wallet addresses to known identities by analyzing transaction flows, exchange records, and points of KYC verification.
The connection often starts when a taxpayer opens an account at a major exchange using personal identifying information. Once that exchange account is tied to a person, deposits, withdrawals, and associated wallet addresses can create a traceable map.
Moving coins from an exchange to a private wallet does not erase the connection. The exchange may have already logged the withdrawal and destination address.
3. Form 1099-DA Matching
Form 1099-DA is the newest and most systematic enforcement mechanism. The IRS states that Form 1099-DA is used to report digital asset proceeds from broker transactions, and taxpayers may need to reconcile those proceeds on Form 8949 and Schedule D.
Beginning with 2025 reporting, digital asset brokers may send taxpayers and the IRS Form 1099-DA showing proceeds from covered transactions. The IRS has reminded taxpayers that many 2025 Forms 1099-DA may not include basis, meaning taxpayers still must calculate basis to determine actual gain or loss.
If proceeds reported to the IRS do not appear correctly on Form 8949 and Schedule D, the IRS automated matching system may flag the gap and issue a CP2000 notice proposing additional tax.
If you have received a CP2000 notice involving digital assets, see Cumberland Law Group’s guide on CP2000 notices and third-party income matching.
The Statute of Limitations Problem: Old Crypto Years May Still Be Open
The standard IRS civil audit window is generally three years from the date a return is filed. If a taxpayer substantially omits income, the period may extend to six years. If fraud is involved, there may be no civil statute of limitations.
Crypto cases can create additional complications.
When the IRS uses a John Doe summons and an exchange resists compliance, the limitations period may be affected by tolling rules. That means certain older tax years may remain open longer than a taxpayer expects.
For taxpayers who traded through exchanges covered by John Doe summons litigation, the age of the return does not automatically mean the IRS is out of time. The summons history, the exchange involved, the tax years at issue, and the facts of the reporting all matter.
This is one reason taxpayers should avoid assuming that older crypto gains are safe simply because the transactions occurred several years ago.
The Form 1099-DA Mismatch Issue Hitting Returns Now
The first wave of Form 1099-DA matching creates a structural problem: brokers may report gross proceeds, while many taxpayers think in terms of net gain.
A taxpayer who bought one Bitcoin for $30,000 and sold it for $45,000 should generally report $45,000 in proceeds and $30,000 in basis on Form 8949, resulting in a $15,000 gain.
If the taxpayer reports only the $15,000 net gain and does not properly list gross proceeds and basis, the IRS system may see the $45,000 reported by the broker and treat the return as missing proceeds.
The IRS instructions for Form 8949 state that taxpayers should report proceeds shown on Form 1099-DA and reconcile basis to determine gain or loss.
Another common issue involves wallet transfers. Moving digital assets between wallets you control is generally not a taxable sale. But if an exchange or broker misclassifies a transfer as a disposition and reports proceeds on Form 1099-DA, the IRS may flag the amount unless the taxpayer can document the transfer.
That is why transaction reconstruction matters. The response cannot simply say, “This was crypto.” It must show what happened, where the asset moved, whether a taxable disposition occurred, and what basis applies.
The Penalty Exposure: Non-Willful, Willful, and Criminal
The difference between making an honest crypto reporting mistake and deliberately hiding gains can change both the penalty rate and the type of IRS proceeding.
| Conduct | Potential Penalty | Authority |
|---|---|---|
| Accuracy-related negligence or disregard | 20% of underpayment | IRC Section 6662 |
| Substantial understatement | 20% of underpayment | IRC Section 6662 |
| Civil fraud | 75% of underpayment | IRC Section 6663 |
| Criminal tax evasion | Possible imprisonment and fines | IRC Section 7201 |
| Filing a false return | Possible imprisonment and fines | IRC Section 7206 |
Interest accrues from the original due date of the return, regardless of penalty category.
The willfulness line is where the enforcement path changes. A taxpayer who did not understand that exchanging one cryptocurrency for another was taxable, or who did not know wallet transfers still needed tracking, may have a non-willful argument.
A taxpayer who answered “No” on the Form 1040 digital asset question while actively trading, moved funds to obscure exchange-reported transactions, or ignored multiple IRS warning letters may have a willfulness problem.
If an audit begins to involve fraud or evasion concerns, speak with a tax attorney before providing explanations, records, or amended returns. Cumberland Law Group handles tax fraud, tax evasion, and criminal tax defense matters.
The Three Mistakes That Make Crypto Audits Much Worse
1. Responding to Letter 6173 Without Reconstruction
Certifying compliance before verifying it is dangerous. Many traders who received Letter 6173 checked that they were in compliance because they believed they had reported everything, without actually reconciling all exchanges, wallets, and taxable events.
If the IRS’s exchange data later shows gaps, the certification itself may become a problem.
2. Assuming Wallet-to-Wallet Transfers Were Taxable
Moving Bitcoin from Coinbase to a Ledger hardware wallet is generally not a taxable sale. But taxpayers reconstructing their history without understanding taxable events sometimes treat every movement as a disposition.
That can overstate gains, distort basis, and create new reporting problems.
3. Using the Original Preparer for the IRS Response
The CPA or tax preparer who filed the original return generally does not provide attorney-client privilege. Their workpapers, emails, and notes may become evidence if the case escalates.
At the point where an IRS letter references potential noncompliance, the original preparer should not necessarily control the response. A tax attorney can manage communications, preserve privilege, and evaluate civil and criminal exposure before the taxpayer speaks to the IRS.
For more context, read Cumberland Law Group’s guide on Tax Attorney vs. CPA.
What Crypto Tax Defense Actually Looks Like
For taxpayers with open years involving unreported or incorrectly reported crypto gains, the first task is transaction reconstruction.
That means reviewing every exchange, every wallet, every DeFi interaction, every taxable event, every transfer, and every potential basis issue before communicating with the IRS.
From that foundation, three paths may exist.
1. Voluntary Disclosure or Amended Returns Before IRS Contact
If the IRS has not formally contacted you, filing accurate amended returns and paying additional tax, interest, and applicable penalties may reduce risk and help avoid escalation.
This option changes once the IRS has already made contact.
2. Protest and Documentation Response
If a CP2000 has arrived or a field audit has opened, the response should be built on the reconciled transaction record. Gross proceeds must be documented, basis must be established, wallet transfers should be excluded from taxable dispositions, and Form 8949 should reconcile against the Forms 1099-DA, 1099-B, or substitute data the IRS received.
The IRS proposal may be wrong or overstated, especially where the IRS assumed zero basis.
3. Criminal Tax Defense
If the case involves multiple years of incorrect digital asset answers, substantial unreported gains, and exchange records that contradict filed returns, the defense posture changes.
Everything said in a civil examination can potentially be used in a criminal proceeding. Representation from a criminal tax defense attorney from the first IRS contact is the safest way to manage that risk.
If you already have unfiled or incorrect returns, review our guide to unfiled tax returns and contact an attorney before deciding how to correct the issue.
Georgia and North Carolina Crypto Audit Context
High-income professionals, technology workers, entrepreneurs, and investors in Atlanta, Raleigh, Charlotte, and Durham were disproportionately likely to trade digital assets during the 2017 through 2021 crypto cycles.
Many taxpayers filed returns for those years without reporting gains because the reporting requirements were not widely understood, exchange reporting was inconsistent, or transactions across wallets were difficult to reconstruct.
Now, older exchange records, John Doe summons data, blockchain analytics, and Form 1099-DA matching may all be active at the same time.
Cumberland Law Group represents taxpayers across Georgia and North Carolina facing IRS crypto letters, CP2000 notices, audit notices, and criminal tax exposure involving digital assets.
Free Consultation with Cumberland Law Group
If you received Letter 6173, Letter 6174, Letter 6174-A, a CP2000 notice, or any IRS notice referencing digital assets or cryptocurrency, get legal review before your next move.
The same applies if you have unfiled or incorrectly filed returns for years when you traded actively, or if you are trying to reconstruct transaction history before the IRS contacts you.
Cumberland Law Group represents individuals and business owners in Georgia and North Carolina across the full range of IRS crypto enforcement, from soft letters and CP2000 responses through field examinations, voluntary disclosure, fraud issues, and criminal tax defense.
Free consultations are available at our offices in:
The enforcement window is open, and the matching is automated. Do not wait for a letter to force the decision.
Call Cumberland Law Group at (800) 960-5359 for a free consultation, or contact us online and we will call you back.
This page is for informational purposes only and does not constitute legal advice. Contact Cumberland Law Group directly for guidance specific to your situation.