Most people sign their return, send it in, and forget about it. That is often the most expensive thing they do all year.
Every number on your tax form reflects a decision, or the absence of one. Retirement distributions reflect how and when withdrawals were taken. Taxable Social Security reflects whether income was managed around the thresholds that determine how much of benefits are taxed. Your final tax liability reflects what the year actually cost you, not what it necessarily had to cost you.
For many people with significant retirement assets, the difference between what they paid and what they could have paid with better planning may not be trivial. It is a gap that can repeat, compound, and grow if the underlying strategy does not change.
The question worth asking now, while the 2025 return is still fresh, is not whether it was filed correctly. It is whether 2026 can be materially better.
The Number Most People Miss Is Not on the Return
Some of the most important costs tied to your tax return do not appear on the form itself.
One example is Medicare’s Income-Related Monthly Adjustment Amount (IRMAA), a surcharge applied to Medicare premiums when income exceeds certain thresholds. In 2026, those thresholds begin at $109,000 for single filers and $218,000 for married couples filing jointly, with higher income levels resulting in progressively higher surcharges ranging from roughly $81 to $487 per month per person depending on tier.
What matters most is timing. IRMAA is based on a two-year lookback, meaning your 2025 tax return is already determining your 2027 Medicare premiums.
For retirees with substantial assets, a required minimum distribution, Roth conversion, capital gain, or one-time withdrawal can push income just over a threshold and trigger higher premiums for two years. Because the surcharge applies in tiers, even a small amount over a cutoff can result in the full increase for that bracket.
Most tax preparers do not model this impact, and many financial advisers do not either.
The Window Your 2025 Return Reflects
If you retired recently and have not yet reached the age for required minimum distributions, which is 73 for most people today, you may be in a key planning window.
Income may be lower, Social Security may not yet be drawing taxable income, and required withdrawals from retirement accounts may not have begun. This can temporarily place taxable income lower than it will be in later years.
This period is often used for Roth conversions, where amounts are moved from traditional IRAs into Roth IRAs and taxed at current rates. The converted funds then grow tax-free and are not subject to future required minimum distributions for the account owner.
The 2025 return reflects whether this type of planning was used. For many households, it was either not used or not fully used. The 2026 return does not have to reflect the same outcome.
The Tax Changes Reflected in Your Return
Two recent tax provisions may affect how 2025 income is evaluated.
The first is a new senior deduction available for tax years 2025 through 2028 for individuals age 65 and older, offering up to $6,000 per person in additional deduction. This benefit phases out starting at $75,000 of modified adjusted gross income for single filers and $150,000 for married couples filing jointly.
The second is the SALT deduction cap, which has been raised to $40,000 for 2025 for households with modified adjusted gross income below $500,000. For some taxpayers, this may change whether itemizing deductions is beneficial compared to taking the standard deduction.
Both provisions interact with withdrawal timing, Social Security income, IRMAA thresholds, and required minimum distributions, which is why the impact depends on the overall tax picture rather than any single rule.
The Question Your 2025 Return Should Raise
Is your current adviser actively building a tax strategy across multiple years, or primarily reviewing outcomes after the return is filed?
Many retirement portfolios were built around accumulation, while retirement income planning requires coordination between withdrawals, conversions, Social Security timing, and tax thresholds.
That includes modeling income decisions before they are realized, not just reporting them afterward.
Your 2025 return is already complete. Your 2026 return is still being shaped by the decisions made now.
The question is whether those decisions are being coordinated with taxes in mind year-round.
CITATIONS
IRMAA 2026 thresholds and Medicare premium surcharges: https://www.kiplinger.com/retirement/medicare/medicare-premiums-2026-irmaa-brackets-and-surcharges-for-parts-b-and-d
RMD starting age and SECURE 2.0 rules: https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-required-minimum-distributions-rmds
Senior deduction eligibility and phaseout thresholds: https://www.irs.gov/newsroom/one-big-beautiful-bill-act-tax-deductions-for-working-americans-and-seniors
SALT deduction cap under the One Big Beautiful Bill Act: https://www.irs.gov/newsroom/irs-releases-tax-inflation-adjustments-for-tax-year-2026-including-amendments-from-the-one-big-beautiful-bill
Roth conversion strategy and the pre-RMD window: https://www.fidelity.com/viewpoints/retirement/tax-savvy-withdrawals
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