The Retirement Income Tax Rules That Can Surprise People Who Thought They Were Done Paying Taxes

Rightfully, retirement should be the time to enjoy the money you've worked decades to save. Without a full-time paycheck and fewer work-related expenses, you might expect your monthly budget to become easier to manage.

Still, there's one expense that doesn't go away: taxes.

If you build your retirement plan on the assumption that your retirement income will be tax-free or that your expenses will automatically fall, you could end up using up your savings quicker than anticipated. Here's what you need to know about the tax rules that govern your retirement income.

Social Security benefits aren't always tax-free

"Social Security is always a dependable source of tax-free income." Not true. Whether your benefits are subject to federal income tax depends on your combined income, which includes your adjusted gross income, non-taxable interest, and half of your Social Security benefits.

Single filers with combined income above $25,000 and married couples with combined income over $32,000 incur taxes on some benefits. Thresholds of $34,000 for single filers and $44,000 for joint filers may result in up to 85% of benefits being included in taxable income.

Still, that doesn't mean you pay an 85% tax rate. It means that portion of your benefits is subject to the applicable federal income tax rate.

Traditional retirement-account withdrawals may increase your taxable income

Traditional IRA and 401(k) accounts receive tax-deferred treatment, meaning you deduct eligible contributions or exclude them from taxable income when you make them, then pay income tax on withdrawals in retirement.

The money doesn't become tax-free once you stop earning a salary.

Traditional retirement-account withdrawals count as ordinary income. How much you withdraw affects your federal tax bracket, taxes on your Social Security benefits, and, in some circumstances, your Medicare premiums.

Qualified withdrawals from a Roth IRA are tax-free under federal rules, and they don't count toward the combined-income calculation used to determine whether Social Security benefits are taxable. Non-qualified withdrawals have different rules.

It's important to know which accounts you may draw from and when.

Required minimum distributions may add another layer

Required minimum distribution (RMD) rules govern traditional IRAs and many employer-sponsored retirement plans. Most seniors must begin taking RMDs at age 73 (the applicable age depends on birth year; some workplace plan exceptions apply).

These withdrawals are considered taxable income even if you don't need the money to pay your bills. You must withdraw the money and pay taxes on it. Failing to do so could trigger a tax penalty.

Pension income may push your tax bill higher

While pensions provide welcome stability after a lifetime of work, their tax treatment depends on their type and how they were funded.

Traditional pensions are taxable as ordinary income when you contributed pretax dollars. If you contributed after-tax money to your pension, that portion may be tax-free.

Government pensions and military retirement benefits may have different rules. However, don't assume your pension is tax-free because it comes from a public-sector job.

Pension income may also increase the combined income used to determine the taxable portion of your Social Security benefits. Add a traditional IRA on top, and these three income sources may produce a large tax bill you didn't expect.

State tax rules may change the retirement math

As expected, federal taxes are only part of the picture. States set their own rules for retirement income, and they may create a substantial difference.

Some states don't impose an individual income tax. Others exempt Social Security benefits but tax certain pension payments or traditional retirement-account withdrawals. Some offer age-based deductions, income limits, or partial exemptions, while others tax a broader range of retirement income.

Moving states doesn't automatically make retirement cheaper, either. A state with no individual income tax may have higher property insurance costs, housing expenses, or other taxes that offset some of the savings.

Tax rules for a married couple: worked example

Let's look at a hypothetical married couple over 65 with a total annual cash income of $80,000 before taxes:

• $36,000 in annual Social Security benefits
• $24,000 in pension income
• $20,000 in traditional IRA withdrawals

Because their combined income exceeds the threshold for married couples, up to 85% of their Social Security benefits is taxable. With the above figures, that means $30,600 is included in their taxable income.

To calculate their adjusted gross income, we look at the couple's pension and IRA withdrawals, or $44,000. Add their $30,600 in taxable Social Security benefits, and their adjusted gross income is $74,600.

For 2026, the couple may claim the $32,200 standard deduction for married couples filing jointly. Because both spouses are at least 65, they also qualify for the regular additional standard deduction for older taxpayers, totaling $3,300 for the two of them.

They may also qualify for the new enhanced senior deduction of $6,000 per person, or $12,000 combined. At their income level, they fall below the $150,000 modified adjusted gross income threshold for married couples filing jointly.

Here's their taxable income, worked out:

Bottom line

While retirement comes with fewer expenses, it doesn't eliminate every bill. Taxes, health care, home maintenance, insurance, and everyday living costs still take up part of your income even after the mortgage is paid off and your career is behind you.

Assuming your expenses will automatically fall after retirement may leave you with a budget that looks good on paper but doesn't reflect your actual costs.

To keep extra cash in your pocket, estimate your annual income after federal and state taxes, then build a budget that includes irregular expenses like home repairs and medical costs. Review your withdrawal strategy every year, particularly after RMDs begin. Consult a tax professional or financial planner to understand how your income sources interact and find ways to make your savings last longer.

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