Tax Day doesn’t have to mean a nasty surprise. The single most important thing retirees can do to survive — and even win — on April 15 is understand which income sources are taxable, how much of your Social Security counts toward your federal bill, and whether you can still make moves today that shrink what you owe. The good news: even on Tax Day itself, several strategies remain on the table, and planning ahead by even a few weeks can protect your income for the rest of the year.

How much of my Social Security is taxable?

Up to 85% of your Social Security benefit can be subject to federal income tax — but the exact percentage depends on your “combined income” (also called provisional income). That’s your adjusted gross income, plus any tax-exempt interest, plus half of your Social Security benefits.

  • If your combined income is below $25,000 (single) or $32,000 (married filing jointly), none of your Social Security is taxed.
  • Between $25,000–$34,000 (single) or $32,000–$44,000 (joint), up to 50% may be taxable.
  • Above those thresholds, up to 85% is taxable.

Those thresholds have not been adjusted for inflation in decades, which means more retirees get pulled into taxation every year — a phenomenon sometimes called “bracket creep.” If you’re close to a threshold, a Roth conversion or charitable contribution strategy could keep you in a lower tier.

When should I claim Social Security to maximise my benefit?

For most people, waiting to claim Social Security pays off significantly. Every year you delay past your full retirement age (which is 67 for anyone born in 1960 or later), your benefit grows by about 8% — up until age 70, when increases stop. Claiming at 62, the earliest possible age, permanently reduces your benefit by as much as 30%.

That said, the right answer is personal. If you’re in poor health, have a shorter life expectancy, or need the income now, claiming earlier may make sense. Married couples especially benefit from a coordinated strategy — often having the higher earner delay to 70 while the lower earner claims earlier — because the surviving spouse inherits the larger benefit.

What are the RMD rules for 2025 and 2026?

Required Minimum Distributions (RMDs) are the amounts the IRS requires you to withdraw from traditional IRAs, 401(k)s, and most other tax-deferred retirement accounts each year. Missing an RMD used to trigger a 50% penalty; that was reduced to 25% under the SECURE 2.0 Act, and can drop to 10% if corrected quickly.

Here’s where things stand:

  • The RMD starting age is now 73 for most retirees (rising to 75 for those born in 1960 or later, starting in 2033).
  • Your RMD amount is calculated by dividing your account balance (as of December 31 of the prior year) by a life-expectancy factor from IRS tables.
  • Qualified Charitable Distributions (QCDs) let you send up to $105,000 per year directly from your IRA to a qualifying charity — it satisfies your RMD but doesn’t count as taxable income, a powerful move for retirees who don’t need the cash.

If you turned 73 in 2025 or 2026, this is likely your first or second RMD year. Don’t wait until December — taking distributions early in the year gives you time to plan around the tax impact.

How do I avoid Medicare IRMAA surcharges?

IRMAA stands for Income-Related Monthly Adjustment Amount. It’s an extra charge added to your Medicare Part B and Part D premiums if your income exceeds certain thresholds. In plain English: if you earned too much two years ago, Medicare charges you more today.

For 2026, Medicare looks at your 2024 tax return. The standard Medicare Part B premium in 2025 was $185.00 per month — but IRMAA surcharges can push that well above $500 per month for higher earners. The thresholds for 2026 IRMAA are set based on modified adjusted gross income (MAGI):

  • Single filers above ~$106,000 or joint filers above ~$212,000 begin paying IRMAA surcharges.
  • Higher brackets apply at $133,000 / $266,000 and above.

The key strategies to avoid or reduce IRMAA:

  1. Manage Roth conversions carefully — large conversions spike your MAGI and can push you into a surcharge bracket.
  2. Use QCDs instead of taxable IRA withdrawals for charitable giving.
  3. Appeal if your income dropped — if you retired, lost a spouse, or had another life-changing event, you can file Form SSA-44 to request a lower IRMAA based on more recent income.

Planning your income two years in advance is the real secret to IRMAA avoidance. The decisions you make today about Roth conversions, capital gains, and RMDs affect what Medicare charges you in 2028.

What last-minute tax moves can retirees still make today?

Even on April 15, a few doors are still open:

  • Fund your IRA for 2025. You have until the tax filing deadline (April 15, 2026) to contribute to a traditional or Roth IRA for the 2025 tax year. If you have earned income, you can contribute up to $7,000 ($8,000 if you’re 50 or older).
  • File for an extension. Filing Form 4868 gives you until October 15, 2026 to file your return — but it does not extend the time to pay any tax you owe. Pay your estimate today to avoid interest and penalties.
  • Check your withholding. Retirees who under-withheld on Social Security, pension, or IRA distributions may face a penalty. Adjusting your W-4P or W-4V forms now prevents the same problem next April.
  • Consider a SEP-IRA if you have self-employment income. Freelance, consulting, or side income? A SEP-IRA contribution can be made up to your filing deadline (including extensions) and is fully deductible.

Tax Day marks a deadline, but smart retirees treat it as a starting line — the moment to begin making better decisions for next year. The retirees who pay the least in taxes aren’t the ones scrambling in April; they’re the ones who spent the prior year quietly managing their income brackets, timing their withdrawals, and making the most of every rule Congress gave them.

Frequently Asked Questions

Frequently Asked Questions

When should I claim Social Security to maximise my benefit?

Delaying Social Security until age 70 gives you the largest possible monthly benefit, with roughly 8% growth for each year you wait past your full retirement age. However, the best age to claim depends on your health, financial needs, and whether you’re married. Married couples often benefit most from a split strategy where the higher earner delays while the lower earner claims earlier.

How much of my Social Security benefit is taxable?

Between 0% and 85% of your Social Security benefit may be subject to federal income tax, depending on your combined income (your AGI plus tax-exempt interest plus half your Social Security). Single filers with combined income below $25,000 and married filers below $32,000 owe nothing on their benefits. Above $34,000 (single) or $44,000 (joint), up to 85% becomes taxable.

What are the RMD rules for 2025 and 2026?

The required minimum distribution (RMD) starting age is currently 73, thanks to the SECURE 2.0 Act. You must withdraw a minimum amount each year from traditional IRAs and 401(k)s based on your account balance and IRS life-expectancy tables. Missing an RMD carries a 25% penalty on the amount not withdrawn, reduced to 10% if corrected promptly.

How do I avoid Medicare IRMAA surcharges?

IRMAA surcharges are triggered when your modified adjusted gross income (MAGI) exceeds set thresholds — in 2026, roughly $106,000 for single filers. Because Medicare looks at your income from two years prior, planning your Roth conversions, RMDs, and capital gains carefully can keep you below the threshold. If your income has dropped due to retirement or another life event, you can appeal using IRS Form SSA-44.

What is the Medicare Part B premium for 2025?

The standard Medicare Part B premium for 2025 is $185.00 per month. However, retirees subject to IRMAA surcharges can pay significantly more — potentially over $500 per month — based on their 2023 income. Keeping your modified adjusted gross income below the IRMAA thresholds is the most effective way to stay at the standard premium rate.