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Tax season isn’t just about paying the IRS — it’s a time to take care of your nest egg. The choices you make on your 2025 tax return may affect your 2026 finances.
Everything from Social Security taxation to Medicare premiums can affect your retirement accounts if you make the wrong moves. Here’s what tax experts say retirees need to know.
How 2025 taxes affect your 2026 retirement
Making strategic changes before filing is often your last chance to protect your money.
“Because the U.S. tax system is progressive, the timing of income and deductions matter as much as the amount.” peter diamondFederally-licensed tax and accounting specialist. “Changes in income or spikes in deductions can move someone into a different tax bracket. Once the year ends, those decisions are locked in — making proactive planning essential.”
The hidden costs of Medicare premiums and IRMAA
For retirees, tax planning doesn’t just affect the amount they owe the IRS — it can also determine how much they pay for Medicare coverage.
“Many retirees are surprised to learn that Medicare Part B and Part D premiums are based on income from two years prior,” said Jenny Groberg, founder and CEO of Medicare. BookSmart Accounting & Bookkeeping. “One-time income increases – such as Roth conversions or large IRA withdrawals – can increase Medicare costs for the entire year.
These surcharges are called income-related monthly adjustment amounts (IRMAA). Kiplinger. Even if your higher income is temporary, it could cause premiums to increase in 2026, leaving less money in your pocket.
Ripple effect of Social Security taxation
Your reported income also determines how much of your Social Security benefits are taxable.
“If your combined income – adjusted gross income plus nontaxable interest and half of your Social Security benefits – exceeds certain limits, up to 85% of the benefits may be taxed,” Diamond explains. “Simple timing adjustments on 2025 returns could help mitigate this impact and preserve more cash flow in 2026.”
Income reported in one year doesn’t just affect taxes that year — it can also impact retirement benefits and costs years later, according to MedicareResources.org.
Strategic Steps That Can Protect Retirement Income
Planning strategies can help retirees manage both current taxes and future income, such as a Roth IRA conversion, which allows you to move assets from a traditional IRA to a Roth IRA by paying taxes on the amount converted now. Loyalty.
“In turn, if you are at least 59 1/2 years old and the Roth account has been open for at least five years, future qualified withdrawals are tax-free,” Diamond said.
Additionally, for retirees age 70 1/2 and older, qualified charitable distributions (QCDs) allow direct donations from an IRA to a qualified charity. charles schwab. QCDs reduce taxable income and can help reduce the IRMAA surcharge.
“Using a strategic Roth conversion or QCD during low-income years can reduce taxable income and protect retirement cash flow,” Groberg said. “These are relatively simple steps that can have a lasting impact.”
However, Diamond cautioned against assuming that retirement automatically means lower taxes.
“If taxes are lower, it may simply be because income is lower and most people don’t want less income in retirement. Retirees often have more free time and more spending, which makes active planning even more important.”
Timing decisions are important
Simple decisions made on the 2025 return could inadvertently increase taxes or reduce benefits the following year. According to Diamond, the most frequently seen disadvantages include:
- Taking large distributions from traditional IRAs or 401(k) plans can push the income into a higher tax bracket.
- Performing large lump sum transactions, such as major Roth conversions or realizing substantial capital gains, can increase modified adjusted gross income (MAGI) and trigger the IRMA surcharge.
- Scheduling Social Security benefits or other income without considering the joint income limit increases the taxable portion of the benefits.
Most ignored mistakes
One of the most overlooked but impactful choices on the 2025 tax return is how large discretionary income events are handled.
“Significant IRA distributions, Roth conversions or capital gains don’t just affect the current year’s tax bill,” Diamond said. “They could also increase the taxation of future Medicare premiums or Social Security benefits.”
Spreading these events out over several years – rather than concentrating them in one year – can materially improve net retirement income.
The second mistake Diamond recommends paying attention to involves cryptocurrencies.
“Unlike stocks and securities, most direct cryptocurrency holdings are not currently subject to wash sale rules,” he said. As a result, if an investor bought Bitcoin for example for $100,000 and saw it fall to $50,000, he could sell the asset, realize a capital loss of $50,000 and repurchase it immediately thereafter, effectively maintaining the same market exposure.
That realized loss can be used to offset capital gains recognized in the same year, improving overall tax efficiency. As retirees look toward 2026, thoughtful planning before filing 2025 taxes is a chance to secure retirement accounts and a financially comfortable future.