Last-Minute Tax Moves You Can Still Make Before You File

Last-Minute Tax Moves You Can Still Make Before You File

The calendar flipped to a new year, but your 2025 tax picture is not completely written yet. A handful of powerful moves remain available between now and the April 15 filing deadline, moves that can reduce your taxable income, boost your retirement savings, and put more money back in your pocket before you sign and submit your return. Most people assume the window for tax planning closes on December 31. For a select group of strategies, that assumption is wrong.

The decisions you make in these final weeks before filing can be just as meaningful as anything you did during the calendar year itself. Whether you have a traditional IRA sitting unfunded, an HSA balance well below its limit, or a self-employment situation that opens the door to significantly larger deductions, the time to act is measured in weeks, not months. Each of the moves below is still on the table, and each one carries a deadline worth knowing precisely.

Key Takeaways

• IRA contributions for 2025 are still open: The deadline to contribute to a traditional or Roth IRA for the 2025 tax year is April 15, 2026, regardless of whether you file an extension. The limit is $7,000 for those under 50 and $8,000 for those 50 and older.
• HSA contributions must be made by April 15: Filing a tax extension does not extend the deadline to contribute to an HSA, prior-year HSA contributions for 2025 must be made by April 15, 2026. The 2025 limits are $4,300 for self-only coverage and $8,550 for family coverage, with a $1,000 catch-up for those 55 and older.
• SEP IRA limits are significantly higher: Self-employed individuals can contribute up to 25% of compensation, capped at $70,000 for 2025, and may have until October 15, 2026 if a tax extension is filed.
• The extension deadline applies to SEP IRAs but not HSAs: These two accounts operate under different rules, and confusing them is a costly mistake.
• Deductibility of traditional IRA contributions depends on your income and workplace plan coverage: High earners covered by a 401(k) at work may find their deduction phased out, the 2025 phase-out for married filers covered by a workplace plan runs from $126,000 to $146,000 MAGI.
• A contribution made today can still carry a 2025 designation: As long as you tell the custodian the contribution is for the 2025 tax year, any deposit made before April 15 counts toward last year’s limit.

Fund Your IRA Before the Deadline

Traditional IRA: A Deduction Still Available to Many

A traditional IRA contribution made before April 15 can reduce your 2025 taxable income by up to $7,000 if you are under 50, or $8,000 if you are 50 or older, provided your income and workplace plan participation allow the deduction. If neither you nor your spouse participates in an employer-sponsored retirement plan, the contribution is fully deductible at any income level. For those who are covered by a workplace plan, deductibility phases out based on modified adjusted gross income. Single filers see the phase-out between $79,000 and $89,000 MAGI for 2025, while married filers covered by a workplace plan see it phase out between $126,000 and $146,000.

Even when the deduction is partially or fully phased out, contributing to a traditional IRA still makes sense for many people. Non-deductible contributions grow tax-deferred and can serve as the first step in a backdoor Roth IRA strategy for higher earners who exceed the Roth contribution income limits. The contribution itself must be clearly designated for the 2025 tax year when you make the deposit, custodians default to the current year otherwise, and the correction process creates unnecessary hassle.

Roth IRA: Long-Term Tax-Free Growth Still Available

A Roth IRA contribution carries no current-year deduction, but the long-term value of tax-free growth on retirement assets is significant. The same April 15 deadline applies, and the same contribution limits — $7,000 under 50, $8,000 at 50 or older, govern how much you can put in across all your IRAs combined. For 2025, single filers are eligible to contribute if their MAGI falls below $150,000, with the contribution phasing out between $150,000 and $165,000. For married filers, the phase-out range runs from $236,000 to $246,000.

High earners above those thresholds are excluded from direct Roth contributions but may pursue a backdoor Roth strategy instead, contributing to a non-deductible traditional IRA and then converting it to a Roth. That conversion, though, must have been completed by December 31, 2025, to count for the prior tax year. If you missed the conversion window, the contribution step alone can still be completed before April 15 and set you up for a 2026 conversion.

Max Out Your HSA — But Act Before April 15

The Only Account With a Triple Tax Advantage

Health Savings Accounts carry a combination of tax benefits that no other savings vehicle matches: contributions reduce taxable income, growth inside the account accumulates tax-free, and withdrawals for qualified medical expenses are never taxed. The 2025 contribution limits are $4,300 for self-only coverage and $8,550 for family coverage, with an additional $1,000 catch-up contribution available to those 55 and older. If your employer contributed to your HSA during 2025, those contributions count toward your limit — so the amount you can still add is the total limit minus what you and your employer already deposited.

The critical rule to understand is that filing a tax extension does not extend the HSA contribution deadline. April 15 is a hard stop. For high earners who tend to file extensions as a matter of course, this is the one account where waiting until October will cost you the opportunity entirely. If your 2025 HSA balance is below the limit and you remain enrolled in an HSA-eligible high-deductible health plan, the deposit can be made directly to your HSA custodian and designated for the 2025 tax year, even if you have not yet filed your return.

Self-Employed? A SEP IRA May Be Your Largest Opportunity

Contribution Limits That Dwarf Standard IRAs

Self-employed individuals, freelancers, consultants, and small business owners with no full-time W-2 employees often have access to a Simplified Employee Pension IRA, which operates under contribution limits that make the standard IRA ceiling look modest by comparison. For 2025, SEP IRA contributions can reach up to 25% of net self-employment compensation, with a maximum of $70,000. For a self-employed individual earning $200,000 in net income, that translates to a potential deduction of around $37,000, a figure that can meaningfully reduce taxable income and the associated self-employment tax burden.

The deadline for SEP IRA contributions is tied to your tax filing deadline, including extensions. Sole proprietors and single-member LLCs who file an extension have until October 15, 2026 to make their 2025 SEP IRA contribution. Partnerships and S-corporations that file for extension generally have until September 15. This flexibility makes the SEP IRA one of the few meaningful tax planning opportunities that extends well beyond April 15, but taking advantage of it requires that the extension be filed on time.

What to Do If You Have Not Set Up a SEP IRA Yet

If you earned self-employment income in 2025 but have not yet established a SEP IRA, you can still open one and make a contribution before the deadline. Unlike a Solo 401(k), which required setup by December 31, 2025, a SEP IRA can be established as late as the tax filing due date, including extensions. The account opening process is straightforward at most major custodians and can frequently be completed online within a single business day. The contribution amount must be calculated correctly based on net self-employment earnings, so working with your advisor or CPA before making the deposit avoids costly corrections later.

Review Deductions and Credits Before You File

Items That Are Frequently Missed

The final weeks before filing are also an opportunity to audit your return for deductions and credits that tend to fall through the cracks. Education credits, including the American Opportunity Credit and the Lifetime Learning Credit, reduce your tax liability dollar-for-dollar rather than simply reducing taxable income, making them particularly valuable for families with qualifying tuition expenses in 2025. If you made qualified charitable contributions during 2025, those deductions require documentation, cash donations need receipts, and non-cash contributions above $500 require Form 8283.

For business owners and self-employed filers, retirement contributions made through the SEP IRA or other qualified plans also interact with the Qualified Business Income deduction. Reducing your net self-employment income through a SEP IRA contribution can restore or increase QBI deduction eligibility in cases where income was close to the phase-out threshold. These interactions are worth modeling carefully before you finalize your return, since the combined effect of a single contribution can cascade across multiple lines of your tax calculation.

Work With Us

Filing season has a way of feeling like a sprint to the finish line, but the strategies covered here, funding an IRA, topping off an HSA, establishing or contributing to a SEP IRA, and reviewing overlooked deductions, are available right up to the deadline for a reason. Congress designed these accounts to encourage retirement saving and health care planning, and the contribution windows reflect that intent. The question is whether you act on them before time runs out or leave money on the table simply because the calendar year ended.

At Avior, we help clients identify exactly which last-minute moves make sense for their income level, account structure, and overall tax picture before they file. The right contribution in the right account at the right time can reduce what you owe this April and compound into meaningful savings over the years ahead. If you want to make sure you are not leaving any of these opportunities behind, schedule a consultation with Avior before filing season closes.