Excess Contribution

An excess contribution is a contribution to a tax-favored individual account that exceeds the amount the law permits for the year. For an IRA that generally means more than the annual limit, more than your taxable compensation, or a Roth contribution made when income made you ineligible. Internal Revenue Code section 4973 imposes "for each taxable year a tax in an amount equal to 6 percent of the amount of the excess contributions," and the individual account holder pays it, reporting it on Form 5329. The word "excess" carries a specific consequence here: the tax is not a one-off penalty for a mistake, it is an annual charge for as long as the money remains where it does not belong.

Four different regimes share the name, and picking the wrong one produces a confidently wrong answer. This page covers the first.

Section 4973 is the individual-account rule described above: 6% per year, paid by the account holder, reported on Form 5329, with a ceiling of 6% of the account's year-end value. Section 4979 is what Publication 560 calls excess contributions in an employer plan, and it is a completely different animal: it arises from a failed actual deferral percentage or actual contribution percentage test, the tax is 10%, it is "paid by the employer," and it is reported on Form 5330. Section 402(g) excess deferrals are a third case, where an employee defers more than the annual elective deferral limit across all plans; the cure deadline is April 15 and is expressly not tied to the return due date, and an excess left in the plan past that date, in the IRS's own words, "is taxed twice, once when contributed and again when distributed." Section 4972 is a fourth, a 10% tax on contributions to a qualified employer plan that the employer cannot deduct, again paid by the employer.

The 4973 reach is wider than IRAs, and Form 5329's structure shows it. The statute lists individual retirement accounts and annuities, Archer MSAs, 403(b)(7) custodial accounts, Coverdell education savings accounts, health savings accounts, and ABLE accounts. Form 5329 carries a separate part for traditional IRAs, Roth IRAs, Coverdell accounts, Archer MSAs, health savings accounts, and ABLE accounts. So the same 6% mechanic that catches an over-funded Roth IRA also catches an HSA funded while the person was not covered by a qualifying high-deductible health plan, which is a far more common mistake. The one account on the statutory list that Form 5329 does not handle is the 403(b)(7) custodial account: that slice of the 6% tax goes on Form 5330, which is mostly an employer's form. It is one of only two entries on Form 5330's who-must-file list that reach an individual at all, the other being a prohibited transaction in one's own retirement account.

How the three cures actually work. The cleanest is to have the custodian return the excess plus the net income attributable to it on or before the due date of the return including extensions. Done that way, no 6% tax applies, the contribution is treated as never made, and only the earnings are taxable, in the year the contribution was made. There is a quiet extension worth knowing: a taxpayer who filed the return on time can still have the contribution returned within 6 months of the unextended due date, filing an amended return marked "Filed pursuant to section 301.9100-2." For a return due April 15, that runs to October 15 whether or not an extension was requested.

The second cure is a later withdrawal. After the deadline, the excess can still be taken out and left out of gross income where the year's total contributions were within the annual limit and no deduction was claimed for the amount being removed. Earnings stay in the account in this version, and the 6% applies for every year the excess was still there at year end.

The third cure requires no transaction at all. Because the statute reduces the running excess by any unused deduction capacity in a later year, an excess can simply be absorbed by contributing less than the maximum in a following year. It is the slowest route, since the 6% keeps applying until the absorption happens, but for someone who would have contributed anyway it costs one year of excise tax and nothing else.

One rule that changed and is still misreported. Before SECURE 2.0, the earnings pulled out with a timely-corrected excess IRA contribution could themselves attract the 10% additional tax on early distributions. Section 72(t)(2)(A)(ix) now exempts a withdrawal of net income attributable to a contribution returned under section 408(d)(4), and Publication 590-A confirms that "beginning on or after December 29, 2022, the 10% additional tax will not apply." The 6% excise and the correction window are unchanged.

When the problem is the wrong account rather than too much money, recharacterization is often the better tool. A Roth contribution made by someone over the income limit can be moved to a traditional IRA and treated as having been made there all along, which removes the excess without taking the money out of a retirement account at all.

Identify the excess amount and the year it belongs to. Decide whether the fix is removal, recharacterization, or absorption. If you are removing it, ask the custodian for a "return of excess contribution" rather than an ordinary distribution, because the calculation of attributable earnings is the custodian's job and the coding on the resulting Form 1099-R differs. Then report the year on the return: earnings on a timely return of excess are income for the year the contribution was made, and any 6% tax owed is computed on Form 5329.

A hypothetical example. Nadia contributes $7,500 to her Roth IRA in February 2026. A December bonus pushes her modified adjusted gross income above the top of the Roth range, so the whole $7,500 is an excess contribution. She notices in March 2027 and has the custodian return the $7,500 plus $310 of attributable earnings before the filing deadline. Result: no 6% tax, the $310 is ordinary income for 2026, and no 10% additional tax applies to it. Had she done nothing, the 6% tax would have been $450 for 2026, and another $450 for every later year the excess was still sitting there at year end.

Pros

• The correction window is generous. Removing the excess with its earnings by the filing deadline, or within six months of it for a timely filer, avoids the excise tax entirely.
• The 6% tax is capped at 6% of the account's value, so it cannot exceed what the account is actually worth.
• Absorbing the excess into a later year's unused limit is a legitimate fix that requires no distribution.
• Since 2023, correcting promptly no longer costs the 10% additional tax on the earnings.

Cons

• The tax recurs annually. An uncorrected excess from a decade ago has been charged 6% ten times over.
• Nothing flags it. Custodians accept contributions up to the statutory limit without knowing your income, your compensation, or what you put in elsewhere.
• Removing an excess after the deadline still costs the 6% for each year it remained, so discovering it late has a fixed and unavoidable price.
• The shared name makes research treacherous, because most search results about "excess contributions" are describing an employer's testing failure rather than an individual's account.