IRA contribution: one number that can change your tax bill before April 15

By Jordan Keller

With the April 15 tax filing deadline looming, many savers are weighing whether to make last-minute IRA deposits for the 2025 tax year. These decisions can affect your tax bill now and your retirement income later, so it matters whether you choose a Roth or a traditional IRA — and whether you’re even eligible to contribute.

Brokerage data show a predictable rush: Fidelity reports a noticeable uptick in IRA activity in the weeks before the deadline, with average contributions jumping and a large share flowing into Roth accounts. That pattern underscores a common year-end behavior — and the need to confirm eligibility before you hit submit.

Who can put money into a Roth IRA for 2025

Not everyone can contribute to a Roth IRA at full value; eligibility depends on your modified adjusted gross income (MAGI). Calculating MAGI can be confusing because it starts with your adjusted gross income and then adds or subtracts specific tax items such as certain deductions, student loan interest, and amounts from conversions or rollovers. The IRS uses slightly different MAGI definitions for different tax benefits, which is why people sometimes misjudge their room to contribute.

Practically speaking, for the 2025 tax year the rules look like this:

Item Single filer Married filing jointly
Maximum contribution $7,000 ($8,000 if age 50 or older)
Full Roth eligibility (MAGI) < $150,000 < $236,000
Phaseout range (partial eligibility) $150,000 – $165,000 $236,000 – $246,000
Complete phaseout (no contribution) ≥ $165,000 ≥ $246,000

If your MAGI sits inside the phaseout band, you can still contribute but the allowable amount is reduced. Above the top threshold, direct Roth contributions aren’t permitted — though some higher-income savers use strategies like a backdoor Roth conversion to get around those limits.

When traditional IRA contributions are deductible

Anyone with earned income can put money into a traditional IRA, but whether that deposit lowers your taxable income today depends on a few factors. The key is whether you or your spouse participate in an employer-sponsored retirement plan, such as a 401(k), and where your MAGI falls.

Participation can include salary deferrals, employer matches, profit sharing or other plan-based contributions. If you (or your spouse) are covered by a workplace plan, the ability to deduct traditional IRA contributions phases out as income rises. If neither spouse is covered by an employer plan, the deduction is generally available regardless of income.

Beyond deduction rules, think about tax strategy: a deductible traditional IRA gives you a current-year tax break but means future withdrawals are taxed as ordinary income, while Roth contributions offer no immediate deduction but grow tax-free and are typically withdrawn tax-free in retirement.

Financial planners caution against contributing simply because of the deadline. Joon Um, a certified financial planner, advises taking a moment to match the move to your broader tax and retirement goals rather than making an automatic deposit at the last minute.

  • Check your MAGI before contributing — eligibility hinges on that figure, and it’s not the same as gross pay.
  • Confirm your earned income is at least equal to the amount you plan to contribute.
  • Weigh current vs. future tax rates to decide between traditional and Roth approaches.
  • Consider tax diversification across account types to manage uncertainty in retirement.
  • Don’t assume a deduction if you or your spouse are covered by a workplace plan — phaseout rules may apply.

Fidelity’s recent data show the behavior many advisers expect: contributions climb as the deadline nears, and most of that uptick has gone into Roth accounts. That trend reflects a preference for tax-free growth, but it doesn’t make Roth the right choice for everyone.

If you’re uncertain, review last year’s tax return to estimate MAGI, run the numbers against the thresholds above, and consider speaking with a tax professional before making a deadline-driven decision. A hurried contribution that doesn’t match your tax situation can create paperwork and possible penalties you’ll regret later.

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