What happens if you over-contribute to an IRA?
Last updated August 2026
Short answer
The penalty is small in any single year and it recurs, which is how a $500 mistake quietly becomes a recurring line on a tax return.
How it usually happens
Income rises above the Roth phase-out after a contribution has already been made early in the year.
Contributing more than your taxable compensation, which is a separate cap from the dollar limit.
Funding IRAs at two providers, since the $7,500 limit for 2026 applies across every IRA you own rather than per account.
The clean fix
Ask the custodian for a return of excess contribution, specifying the amount and the tax year.
They calculate the net income attributable to it and distribute both, which removes the excess from the account.
Done before the filing deadline including extensions, no excise tax applies. The earnings are taxable in the year they were earned, and may carry the additional tax if you are under 59.5.
If the deadline has passed
The 6% applies for that year and is reported on Form 5329.
Withdrawing the excess afterwards, without earnings, stops it accruing for subsequent years.
Alternatively, contributing less than the limit in a later year absorbs the excess into that year's allowance, which suits someone who wants the money to stay invested.
Try it in Walnut
Walnut connects to your brokerage and reads your IRA balances across providers, which is the view that catches a double contribution before the year ends.
Recharacterisation
A contribution made to a Roth IRA can be recharacterised as a traditional IRA contribution, or the reverse, within the deadline.
That resolves an excess caused by exceeding the Roth income limits without removing the money from a tax-advantaged account.
Conversions can no longer be recharacterised, so this applies to contributions only, which is a distinction people frequently miss.
Avoiding it next time
Contribute after the year ends, once income is known, rather than in January when it is a forecast.
If income is close to the Roth phase-out, using the backdoor route avoids the question entirely, since conversions have no income limit.
Keep one running total across providers, because nobody else is aggregating your accounts for you.
The 401(k) version
Excess elective deferrals must be identified and returned by the April deadline following the contribution year.
Left in place, the amount is taxed in the contribution year and again when eventually distributed, which is worse than the IRA outcome.
It arises most often when changing jobs mid-year, because two payroll systems cannot see each other.
A worked case
Somebody contributes $7,500 to a Roth IRA in January 2026, then earns above the phase-out and is only permitted $3,000.
The $4,500 excess, plus the earnings attributable to it, is withdrawn before the filing deadline. No excise tax applies and only the earnings are taxable.
Had it been left in place, the excise tax would be $270 for 2026 and another $270 for every year it remained, on money that was meant to be tax-advantaged.
Sources
Excess contributions, the 6% excise tax, corrective distributions and recharacterisation are covered in IRS Publication 590-A, with the reporting form described at About Form 5329. Walnut is informational and is not an investment adviser. This guide is educational and not personalized tax advice.
FAQ
What happens if I contribute too much to an IRA?
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A 6% excise tax applies to the excess for each year it remains in the account. It is not a one-off charge: leaving the excess in place means paying 6% again every year until it is corrected.
How do I fix it?
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Withdraw the excess plus any earnings attributable to it before the tax filing deadline for that year, including extensions. Done in time, no excise tax applies, though the earnings are taxable in the year they were earned.
What if I miss the deadline?
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The 6% applies for that year. You can then either withdraw the excess, without the earnings, or absorb it by contributing less than the limit in a following year, which stops the tax accruing further.
What causes an over-contribution?
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Most commonly income rising above the Roth phase-out after the contribution was made, contributing more than earned income, or funding accounts at two providers without adding up the total.
Can I recharacterise instead?
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Yes, in some cases. Recharacterising a Roth contribution as a traditional one, or the reverse, is still permitted for contributions, and it can resolve an excess caused by exceeding the Roth income limits.
How are the earnings calculated?
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By a formula based on the change in account value over the period the excess was in the account. The custodian normally calculates it, and it can be negative, in which case less than the contribution comes out.
Which form reports it?
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Form 5329 reports the excise tax, and Form 8606 may be involved if basis is affected. The custodian issues a Form 1099-R for the corrective distribution with a code indicating what it was.
Does the same apply to a 401(k)?
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The mechanism differs. An excess deferral must be returned by the April deadline following the contribution year, and if it is not, the amount is taxed twice: in the contribution year and again on distribution.
How much is the tax in practice?
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6% of the excess each year. On a $4,500 excess that is $270 for the first year and another $270 for every year it stays in the account, which is why correcting it promptly matters more than the headline percentage suggests.