The most important thing to do right after filing your taxes is to use what you just learned about your income, benefits, and deductions to make smarter retirement money moves for the rest of the year. Your tax return isn’t just a receipt for the IRS—it’s a detailed financial snapshot that can guide decisions about Social Security timing, Required Minimum Distributions (RMDs), and Medicare costs. Taking even a few hours this week to review that snapshot could save you hundreds or thousands of dollars before December 31.
Why does tax season matter so much for retirees?
For most working people, taxes are fairly predictable: wages come in, withholding goes out, done. In retirement, the picture is more complicated. Your income can come from Social Security, pensions, investment accounts, part-time work, and retirement account withdrawals—and each source is taxed differently. More importantly, the total of all those income streams affects things you might not expect, like your Medicare premiums. That’s why the weeks right after Tax Day are actually one of the best planning windows of the year.
What should I do with my tax return right now?
Start by pulling out your 2025 return (or your just-filed 2025 return if you filed for this year) and finding one number: your Modified Adjusted Gross Income, or MAGI. This is essentially your total income before certain deductions. You don’t need to be an accountant to find it—it’s on Line 11 of Form 1040, and your tax software will show it clearly.
Here’s why that number matters so much:
- Medicare IRMAA surcharges are based on your MAGI from two years prior. So your 2024 income determined your 2026 Medicare premiums. If your income dropped significantly in 2025, you may be able to appeal and lower your 2027 premiums.
- Social Security taxation kicks in once your combined income (MAGI plus half your Social Security benefit) exceeds $25,000 for single filers or $32,000 for married couples filing jointly. Up to 85% of your benefit can become taxable.
- RMD planning for the rest of the year depends on knowing where you stand income-wise, because RMDs count as ordinary income and can push you into a higher bracket.
How much of Social Security is taxable?
This surprises a lot of people: Social Security benefits can be partially taxable at the federal level, and the threshold hasn’t been updated for inflation in decades, which means more retirees are affected every year. If your combined income is between $25,000 and $34,000 (single) or $32,000 and $44,000 (married filing jointly), up to 50% of your benefit is taxable. Above those limits, up to 85% is taxable. State taxes vary—some states exempt Social Security entirely, others don’t. Checking your 2025 return now tells you exactly how much was taxed last year, so you can plan withholding or estimated payments for 2026.
What are the RMD rules I need to know for 2025 and 2026?
Required Minimum Distributions are the annual withdrawals the IRS requires you to take from traditional IRAs, 401(k)s, and most other pre-tax retirement accounts once you reach a certain age. Under current rules, RMDs begin at age 73. If you turned 73 in 2025, you had until April 1, 2026 to take your first RMD—meaning some people may have just taken two RMDs in a single year, which can spike income and taxes. For 2026, you must take your annual RMD by December 31. Missing an RMD carries a penalty of 25% of the amount you should have withdrawn (reduced to 10% if corrected quickly), so calendar reminders are worth setting today.
If your RMDs are pushing your income higher than you’d like, talk to a financial advisor about strategies like Qualified Charitable Distributions (QCDs)—a way to send up to $108,000 per year directly from your IRA to a qualified charity, which satisfies your RMD without the amount counting as taxable income.
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How do I avoid Medicare IRMAA surcharges?
IRMAA stands for Income-Related Monthly Adjustment Amount—it’s the extra amount higher-income Medicare beneficiaries pay on top of the standard Part B and Part D premiums. In 2026, the standard Medicare Part B premium is $185.00 per month. But if your 2024 MAGI exceeded $106,000 (single) or $212,000 (married filing jointly), you’re already paying more.
The good news: if your income dropped in 2025 due to retirement, job loss, divorce, or another life-changing event, you can file Form SSA-44 with the Social Security Administration to request that they use your more recent income instead. This is one of the highest-value moves a newly retired person can make, and Tax Day—when your income figures are fresh—is the perfect time to act.
For ongoing planning, watch out for income spikes from large Roth conversions, selling a vacation home, or taking unusually large IRA withdrawals, all of which can trigger IRMAA two years down the road.
When should I claim Social Security to get the most money?
If you haven’t claimed yet, your fresh tax return is a great prompt to revisit the timing question. The basics: you can claim as early as 62, but your monthly benefit is permanently reduced. Waiting until your Full Retirement Age (67 for anyone born in 1960 or later) gives you your full benefit. Waiting until 70 earns you an extra 8% per year in delayed retirement credits—a guaranteed return that’s hard to beat.
The right answer depends on your health, other income sources, whether you’re married, and your overall financial picture. But here’s a useful rule of thumb: if you’re in good health and don’t urgently need the income, every year you wait past your Full Retirement Age adds significantly to your lifetime benefit. Run the numbers with the Social Security Administration’s free online calculator at ssa.gov, and consider discussing the decision with a fee-only financial advisor.
What else should be on my post-Tax Day checklist?
Beyond the big-ticket items above, a few practical tasks are worth tackling this week:
- Store your tax documents securely. Keep returns and supporting documents for at least three years (seven years if you claimed a loss). A fireproof box or a password-protected digital folder both work.
- Adjust withholding if needed. If you owed a large amount or got a very large refund, update your W-4P (for pension or annuity withholding) or make estimated quarterly tax payments. The next estimated payment deadline is June 16, 2026.
- Check your Social Security earnings record. Log in at ssa.gov/myaccount and verify your earnings history is accurate. Errors are rare but they do happen, and they affect your eventual benefit.
- Schedule a mid-year financial check-in. Set a calendar reminder for July to review your income, estimated taxes, and any Roth conversion opportunities before year-end decisions get rushed.
Tax Day felt like the finish line, but for smart retirees it’s really the starting gun for the rest of the year’s planning. A little attention now pays off every month.
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Frequently Asked Questions
When should I claim Social Security to maximise my benefit?
Claiming Social Security at 70 gives you the largest possible monthly payment, thanks to delayed retirement credits of 8% per year past your Full Retirement Age (67 for those born in 1960 or later). Claiming at 62 permanently reduces your benefit by up to 30%. The right timing depends on your health, other income, and whether you are married, so running personalised estimates at ssa.gov is a smart first step.
How much of my Social Security benefit is taxable?
Up to 85% of your Social Security benefit can be subject to federal income tax, depending on your combined income—your Modified Adjusted Gross Income plus half of your annual Social Security benefit. Single filers with combined income above $34,000 and married couples above $44,000 hit the 85% threshold. Some states also tax Social Security, while others exempt it entirely.
What are the RMD rules for 2025 and 2026?
Required Minimum Distributions must begin at age 73 under current law, and the annual deadline is December 31 each year (with a one-time extension to April 1 of the following year for your very first RMD). Missing an RMD triggers a 25% penalty on the amount not withdrawn, reduced to 10% if corrected promptly. Qualified Charitable Distributions of up to $108,000 per year can satisfy RMDs without the withdrawal counting as taxable income.
How do I avoid Medicare IRMAA surcharges?
IRMAA surcharges are added to Medicare Part B and Part D premiums when your Modified Adjusted Gross Income from two years prior exceeds certain thresholds (starting at $106,000 for single filers in 2026). If your income dropped significantly due to retirement or another life event, you can appeal using Form SSA-44 to have Medicare use a more recent year’s income. Avoiding large one-time income spikes—such as oversized Roth conversions or big asset sales—also helps keep you below the thresholds.
What is the Medicare Part B premium in 2025 and 2026?
The standard Medicare Part B premium for 2025 was $185.00 per month, and it remains $185.00 per month for 2026 at the base level. Higher-income beneficiaries pay more through IRMAA surcharges, which add anywhere from roughly $74 to over $443 per month depending on income. If you believe your surcharge is based on outdated income information, you can request a review from the Social Security Administration.