In February 2024, the IRS announced a significant enforcement initiative targeting high-income individuals who have failed to file federal income tax returns. Using funding from the Inflation Reduction Act, the IRS is sending compliance letters to more than 125,000 individuals who have not filed returns since at least 2017 — many of whom earn more than $400,000 per year and some of whom earn more than $1 million. This initiative represents a shift in IRS enforcement priorities and a warning to non-filers that the era of reduced enforcement is ending.^[1]

The Scope of the Problem

Non-filing is one of the most significant contributors to the tax gap — the difference between what taxpayers owe and what they actually pay. The IRS estimates that non-filing accounts for tens of billions of dollars in unpaid taxes each year. For years, the IRS lacked the resources to pursue non-filers systematically, particularly high-income non-filers whose returns require more complex analysis. Budget cuts and staffing reductions left the IRS focused primarily on processing returns and issuing refunds, with enforcement activity declining across the board.

The Inflation Reduction Act changed this calculus. With $80 billion in new funding over ten years (later reduced to approximately $58 billion through subsequent legislation), the IRS has the resources to rebuild its enforcement capabilities. The non-filer initiative is one of the first visible results of this investment, and the IRS has signaled that more enforcement actions targeting high-income individuals, large corporations, and complex partnerships are forthcoming.

What the Compliance Letters Mean

The compliance letters — which the IRS began sending in early 2024 — are not audit notices. They are a first step in the IRS's effort to bring non-filers back into compliance. The letters notify the recipient that the IRS has information (from W-2s, 1099s, and other third-party reports) indicating that the individual had income in the relevant year but did not file a return. The letters request that the recipient file the delinquent returns or explain why no return was due.^[2]

Recipients should take these letters seriously. Ignoring a compliance letter does not make the problem go away — it escalates it. If the taxpayer does not respond, the IRS may prepare a substitute for return (SFR) under IRC § 6020(b), which is typically calculated using the most unfavorable assumptions (filing status of single, no deductions beyond the standard deduction, no credits). The IRS will then assess tax based on the SFR and begin collection proceedings, which can include liens, levies, and passport revocation for seriously delinquent tax debts.

Consequences of Non-Filing

The consequences of willful failure to file extend beyond the tax itself. The failure-to-file penalty under IRC § 6651(a)(1) is 5% of the unpaid tax for each month or part of a month that the return is late, up to a maximum of 25%. This penalty runs in addition to the failure-to-pay penalty and interest on the underlying tax liability. For a taxpayer who owes $500,000 and has not filed for several years, the combined penalties and interest can easily double or triple the original tax liability.^[3]

More seriously, willful failure to file a tax return is a criminal offense under IRC § 7203, punishable by up to one year in prison and a $25,000 fine (plus the costs of prosecution) for each year of non-filing. While the IRS does not criminally prosecute most non-filers, the risk increases significantly for high-income individuals — particularly those who have taken affirmative steps to conceal income or avoid detection. The IRS Criminal Investigation division has indicated that non-filer cases are a priority, and the new funding will support additional criminal investigations.

Voluntary Disclosure and Coming Into Compliance

For non-filers who receive a compliance letter — or who recognize that they need to come into compliance before the IRS contacts them — the critical question is how to re-enter the system in a way that minimizes penalties and avoids criminal exposure. Several options are available, and the right approach depends on the facts.

The simplest approach is to file the delinquent returns, pay the tax, and request abatement of the failure-to-file penalty based on reasonable cause. The IRS will abate the penalty if the taxpayer can demonstrate that the failure to file was due to reasonable cause and not willful neglect. Common reasonable cause arguments include serious illness, death of a family member, reliance on a tax professional who failed to file the return, and inability to obtain necessary records. The success of a reasonable cause argument depends heavily on the facts, and taxpayers should work with experienced tax controversy counsel to develop the strongest possible case.^[4]

For taxpayers with potential criminal exposure — those who have willfully concealed income, used offshore accounts, or taken other affirmative steps to evade tax — the IRS's voluntary disclosure practice may be appropriate. Under this practice, a taxpayer who comes forward before the IRS initiates an investigation may be able to resolve the matter civilly (through the payment of back taxes, interest, and penalties) without criminal prosecution. The voluntary disclosure practice is not a formal program with guaranteed outcomes, but it has historically provided a reliable path to resolving criminal exposure for taxpayers who come forward in good faith.

What To Do Now

For high-income individuals who have unfiled returns, the message is clear: act now, before the IRS acts for you. Filing delinquent returns voluntarily — before the IRS prepares a substitute for return or initiates an investigation — puts the taxpayer in the strongest possible position to negotiate penalty abatement and avoid criminal exposure. The longer a non-filer waits, the more limited the options become and the higher the stakes.

If you have received a compliance letter, or if you have unfiled returns and have not yet heard from the IRS, the first step is to consult with a tax professional who can assess the situation, determine the best approach for coming into compliance, and represent you before the IRS. The sooner you address the issue, the better the outcome is likely to be.^[5]