Retirement Social Security

You Have Until April 15 to Make This Social Security–Saving Tax Move

And who can benefit the most.

By David Maina

Edited by Laura Hohenstein

Updated March 10, 2026

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Many retirees assume their tax situation for the previous year is fixed once January arrives. In some cases, there is still time to adjust it. A deductible Traditional IRA contribution made by April 15 can still be applied to the 2025 tax year.

This matters because Social Security taxes depend on your total income, not your benefit alone. Lowering your adjusted gross income (AGI) with a last-minute IRA deduction can sometimes reduce how much of your senior benefits count as taxable.

Here's how the strategy works, when it can help, and the key limits to understand before the deadline passes.

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How Social Security taxes are triggered

Social Security taxation largely comes down to your combined income, which includes your adjusted gross income, any tax-exempt interest, and half of your Social Security benefits.

The IRS (Internal Revenue Service) then compares that combined amount with fixed income thresholds. For single filers, the key breakpoints are $25,000 and $34,000, and for married couples filing jointly, $32,000 and $44,000.

Below the first threshold, benefits are not taxed. Once income crosses that line, a portion becomes taxable, and the share generally rises as income increases.

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Why a traditional IRA contribution can change the outcome

A deductible Traditional IRA contribution reduces your adjusted gross income, and because AGI feeds directly into the combined income formula, that deduction can also reduce how much of your Social Security becomes taxable.

This move tends to matter most when you're close to a cutoff. If you're just over a threshold, a deductible contribution can sometimes pull you back under it. Even when it doesn't, lowering AGI can reduce the portion of benefits that gets pulled into taxable income.

One important detail is that this strategy only works with deductible Traditional IRA contributions. Roth IRA contributions don't reduce AGI, so they don't help on the Social Security tax calculation for a prior-year return.

A worked example of the tax impact

Take a single retiree receiving $1,950 a month in Social Security, or $23,400 a year. For tax purposes, half of that benefit counts toward combined income, which is $11,700.

Now assume they also had $18,000 of taxable IRA withdrawals in 2025. Their combined income would be $29,700 ($18,000 plus $11,700), which puts them above the $25,000 threshold where part of Social Security becomes taxable.

If they then make a $2,000 deductible Traditional IRA contribution for 2025 by April 15, their AGI drops by $2,000. Combined income drops by the same amount, to $27,700.

In this simplified example, that reduction can shrink the taxable portion of Social Security by roughly $1,000, in addition to the deduction from the contribution itself.

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Eligibility requirements and contribution limits

First, you generally need earned income during the year. IRA contributions must be based on taxable compensation such as wages or self-employment income. Social Security benefits, pensions, and IRA withdrawals do not count as compensation for contribution purposes.

Also, if you're married filing jointly, and your spouse had earned income, you may be able to contribute through a spousal IRA, even if you didn't work yourself. In that case, one spouse's earnings can support contributions for both spouses, subject to the overall limits.

For the 2025 tax year, the IRA contribution limit is $7,000, or $8,000 if you're age 50 or older. You can't contribute more than your earned income for the year, and the limits apply across all IRA contributions.

Deductibility can also phase out if you or your spouse is covered by a workplace retirement plan and your income is above certain ranges, so the key is confirming the contribution will actually be deductible.

Deadline requirements and how to designate the tax year

To count for the 2025 tax year, the contribution has to be made by April 15, 2026. After that date, you can still contribute to an IRA, but it won't reduce your 2025 income or affect how your 2025 Social Security benefits are taxed.

There's also a small but important detail that is easy to overlook. If you make the contribution in early 2026, you need to designate it as a 2025 contribution with your IRA provider. Many brokerages let you choose the tax year at the time you deposit, but if you don't select it, the contribution may default to 2026.

To put it simply, the contribution must be made by April 15 and designated for 2025.

Bottom line

A prior-year deductible Traditional IRA contribution is one of the few moves that can still change your 2025 tax picture after the year ends. Lowering your adjusted gross income may also reduce how much of your Social Security becomes taxable, especially if you're close to one of the income thresholds.

The key is confirming eligibility and making the contribution by April 15, while designating it for the 2025 tax year. Understanding the mechanics can help you make the right moves before that window closes for good.

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