Last-minute IRA contribution: cut last year's taxes in April

By Tom, CPA · Updated October 27, 2026

Part of: Easy Tax Strategies

TL;DR: You can contribute to a traditional or Roth IRA for a tax year until that year's unextended filing deadline, typically April 15. A deductible traditional IRA contribution made in April reduces the prior year's tax. For 2026, the limit is $7,500, plus $1,100 at 50+, and the deadline is April 15, 2027.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

Most tax moves die at midnight on December 31. The IRA is the zombie that keeps walking until April. You can sit down to do your taxes, see the number you owe, contribute to an IRA, and watch the number shrink. It feels like time travel, and it is fully legal.

This guide covers the deadline, who can deduct, how to make sure the deposit counts for the right year, the spousal IRA, and a worked example. Figures from IRS Notice 2025-67 and IR-2025-111, checked October 27, 2026. Part of easy tax strategies.

CPA Warning Label: Tell your IRA custodian which tax year a January-to-April deposit is for; if you do not, it is usually coded as the current year and the prior-year deduction disappears.

Deadline

Contributions for a tax year can be made from January 1 of that year through the due date of the return for that year, not including extensions. For 2026 contributions, that is generally April 15, 2027. Filing an extension does not extend the IRA deadline.

Disaster relief notices sometimes postpone deadlines for taxpayers in affected areas, and those postponements can include IRA contributions. Check the IRS disaster relief page for your county if that applies.

The same April deadline applies to direct HSA contributions, so a single sitting in March can handle both. Employer plan deferrals, by contrast, must come out of paychecks during the year; see the 1% raise trick.

The 2026 limits

• Contribution limit: $7,500 total across all your traditional and Roth IRAs.
• Catch-up at 50+: $1,100, now indexed under SECURE 2.0, for $8,600 total.
• Earned income cap: you cannot contribute more than your taxable compensation for the year (a spouse's compensation can count; see spousal IRA below).
• No age limit for traditional IRA contributions since 2020, as long as you have compensation.

The 2027 limits had not been announced as of October 27, 2026.

Deductibility

Anyone with compensation can contribute to a traditional IRA. Whether the contribution is deductible depends on workplace plan coverage and modified AGI. 2026 phaseout ranges:

"Covered" means you were an active participant in an employer plan during the year; box 13 of your W-2 usually shows it. Above the range, a nondeductible contribution is still possible and is the first step of a backdoor Roth. Phaseout math is detailed in IRS Publication 590-A.

Designating the year

Between January 1 and the April deadline, a deposit could be for either year. The custodian reports it on Form 5498 for the year you designate.

• Online: most custodians ask "Which tax year is this contribution for?" Select the prior year.
• By check: write "2026 contribution" in the memo and on the deposit form.
• Check the confirmation. If it is coded wrong, ask the custodian to recharacterize the tax year promptly; fixing it later is harder.

Roth IRA contributions follow the same deadline and the same designation. If you are deciding between them, see Roth or pre-tax, and for how Roth withdrawals are ordered, Roth IRA contribution ordering.

Spousal

A married couple filing jointly can fund an IRA for a spouse with little or no earned income, based on the working spouse's compensation. Combined contributions cannot exceed the couple's taxable compensation. Each spouse has their own account and their own $7,500 limit (plus catch-up if 50+).

Deductibility for the non-working spouse uses the $242,000 to $252,000 range if the working spouse is covered by a workplace plan. This makes the spousal IRA one of the easiest deductions for one-earner households and early retirees with a part-time earner.

Example

Illustration: In March 2027, Lavish Larry and his spouse prepare their 2026 return. Joint wages: $120,000; only Larry is covered by a workplace plan; they take the $32,200 standard deduction. Taxable income: $87,800, in the 12% bracket (which runs to $100,800 for joint filers in 2026). Their modified AGI is under $129,000, so both can make fully deductible contributions.

They also check the Saver's Credit: their AGI after the deduction is $105,000, above the $80,500 joint limit, so no credit. At 12%, they might also reasonably choose Roth IRAs instead, giving up $1,800 now for tax-free withdrawals later. Either way, they decide in April, after the year is over, with full information.

Traditional or Roth in April?

April is a uniquely good time to choose, because you know last year's actual income. Some patterns:

• Low bracket (10% or 12%) last year: a Roth contribution often makes more sense; the deduction is worth little.
• 22% or higher, and the deduction is available: traditional usually saves more now; compare with expected retirement rates.
• Income above the Roth phaseout ($153,000 to $168,000 single, $242,000 to $252,000 joint for 2026) and no deduction available: a nondeductible traditional contribution followed by conversion.
• Near a credit or subsidy cliff: a deductible contribution reduces AGI, which can help with the Saver's Credit, ACA premium tax credits and other phaseouts.

You can also split: part traditional, part Roth, as long as the total stays under the limit.

Pairing with the Saver's Credit

Lower-income savers get a double benefit. A deductible IRA contribution reduces AGI, and the contribution itself can qualify for the Saver's Credit of 10%, 20% or 50% of up to $2,000 per person. For 2026, the credit is available with AGI up to $40,250 single, $60,375 head of household and $80,500 joint. Because the April contribution counts for the prior year, a worker who discovers at tax time that they are just above a credit tier can sometimes drop below it with a deductible contribution. See the Saver's Credit guide.

A March to-do list

The order matters when you are doing this at tax time:

1. Draft your return first, without the IRA, to see your AGI, bracket and any credits near a threshold.
2. Check whether you or your spouse were covered by a workplace plan (W-2 box 13) and look up the deduction range.
3. Decide traditional, Roth or a split, and the amount, keeping total contributions under the $7,500 limit ($8,600 at 50+) and under your compensation.
4. Make the deposit, designate the prior year, and save the confirmation.
5. Enter the contribution on the return; for nondeductible amounts, file Form 8606 to track basis.
6. Invest the cash. An IRA contribution sitting in a money market for a decade is a missed opportunity, not a strategy.

If you are filing early in February, you can still contribute after filing and then amend, but it is far simpler to contribute before you file. Then, ideally, set up monthly contributions for the current year so next April is calmer.

Common mistakes

• Waiting for the extension. The IRA deadline does not move with a filing extension.
• Exceeding compensation. A teenager with $3,000 of wages can contribute $3,000, not $7,500; see custodial Roth IRAs.
• Ignoring the pro-rata rule before a backdoor Roth if you have pre-tax IRA balances.
• Contributing to an inherited IRA. You cannot add new contributions to an inherited IRA; see the inherited IRA 10-year rule.
• Excess contributions. Too much in one year triggers a 6% excise tax each year until fixed. Withdraw the excess and its earnings by the filing deadline (including extensions) to avoid it.