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5 Numbers to Watch Every Year in Retirement To Avoid a Tax Day Surprise

5 Numbers to Watch Every Year in Retirement To Avoid a Tax Day Surprise

January 23, 2026

A lot of people assume taxes get “simpler” in retirement. In reality, they often get more strategic. You may have fewer income sources, but more control over which accounts you pull from, how much income you create, and what that does to your total tax picture.

Here are five numbers worth checking every year to avoid unpleasant surprises and to spot opportunities before they disappear.

1) Your taxable income (and what bracket you’re sitting in)
Your bracket is the most important tax planning tool. The goal isn’t necessarily “pay the least taxes possible this year.” It’s to avoid accidentally drifting into higher taxes later because you delayed planning now.

2) Your MAGI (Modified Adjusted Gross Income)
MAGI is one of the most important “hidden” numbers in retirement because it affects more than taxes. It’s also used to determine certain Medicare costs and phaseouts. Two retirees can have the same lifestyle spending and completely different MAGI depending on where their money is coming from.

3) Your IRA/401(k) distribution amount (especially if RMDs apply)
Once Required Minimum Distributions (RMDs) begin, they can push you into higher tax brackets, whether you need the income or not. Knowing your required amount early in the year gives you time to adjust around it, instead of reacting in December.

4) How much of your Social Security is being taxed
Social Security can be tax-free, partially taxed, or heavily taxed, depending on your overall income. The surprise for many retirees is that an extra withdrawal—even for something reasonable like a big trip or home project—can cause more of your Social Security to become taxable.

5) Your realized capital gains (from brokerage accounts)
Brokerage accounts can be extremely tax-efficient, but only if you’re intentional. Some years you can realize gains at favorable rates, or harvest losses to offset gains. In other years, one large sale can stack on top of IRA withdrawals and create a much higher tax bill than expected.

Bottom line: Retirement tax planning is less about “doing taxes” and more about managing the levers before they manage you.

If you want help reviewing your five numbers and building a tax-aware withdrawal plan, we can map it out together.