Most retirement pensions are taxable income, but the amount you owe depends on what kind of pension you have and how much other income you earn

When you receive a pension payment, the IRS treats it as ordinary income. That means you report it on your tax return and pay federal income tax on it at your regular tax rate. Some pensions are fully taxable, some are partially taxable, and a small number are tax-free — it depends on whether you or your employer paid the contributions and whether the pension comes from a government or private source.

The key distinction is whether contributions were made with pre-tax or after-tax dollars. If your employer contributed money to fund your pension and you did not pay income tax on those contributions when they were made, the pension payments are fully taxable. If you contributed your own after-tax money, only the portion that comes from your employer's contributions and investment earnings is taxable.

Key Takeaways

  • Most private pensions funded by employer contributions are fully taxable as ordinary income at your regular tax rate.
  • Government pensions (federal, state, local) may be partially taxable depending on when you started work and whether you paid into Social Security.
  • If you contributed after-tax money to your pension, you can exclude that portion from taxable income using IRS Form 8606.
  • Your pension income may push you into a higher tax bracket or affect how much of your Social Security is taxed.
  • Your pension payer should send you a Form 1099-R each January showing how much was paid and how much is taxable.

How employer pensions are taxed

A traditional employer pension — the kind paid by a company or union after you retire — is taxable income in the year you receive it. Your pension payer (the company's benefits department or a pension administrator) withholds federal income tax from each payment automatically, unless you tell them not to. The amount withheld is based on a W-4P form you fill out, which works like a W-4 for employment income.

At the end of the year, you receive a Form 1099-R showing the total pension payments you received and the amount already withheld. You report this on your tax return. If too much was withheld, you get a refund; if too little, you owe the difference when you file.

The tax rate you pay depends on your total income for the year. If your pension is your only income, you pay tax only on the amount above the standard deduction for your filing status. If you have other income — Social Security, investment earnings, part-time work — your pension is taxed on top of that, which may push you into a higher bracket.

Government pensions and the Windfall Elimination Provision

Federal, state, and local government pensions follow different rules than private pensions, and the rules changed depending on when you started work. If you worked for a government employer and did not pay into Social Security, your pension is fully taxable. If you worked for a government employer and did pay into Social Security, your pension may be partially taxable under a rule called the Windfall Elimination Provision (WEP).

The WEP reduces the amount of your government pension that is tax-free, which means more of it becomes taxable. The exact reduction depends on your birth year and how long you worked in government. This rule applies only to people who receive both a government pension and Social Security benefits.

If you receive a government pension but no Social Security, the WEP does not apply and your pension is fully taxable. If you receive a government pension and Social Security, you should ask your pension payer or a tax professional whether WEP affects you, because the calculation is complex and mistakes are common.

Pensions funded by your own contributions

If you contributed your own after-tax money to a pension plan — meaning you paid income tax on that money when you earned it — you can exclude that portion from taxable income when you receive pension payments. This is called the cost basis or employee contributions.

To claim this exclusion, you must file IRS Form 8606 with your tax return. You will need to know the total amount you contributed over your working years (your pension payer or former employer can provide this) and the total amount of your pension payments for the year. The IRS then calculates what percentage of each payment is your contribution (tax-free) and what percentage is employer contribution and earnings (taxable).

This calculation applies to all your pensions combined. If you receive multiple pensions, you cannot pick and choose which ones to treat as after-tax contributions; the IRS pro-rates across all of them.

How pension income affects Social Security taxation

Receiving a pension can increase the amount of your Social Security benefits that becomes taxable. Social Security is not taxed if it is your only income, but when you add other income — including pensions — the taxation formula changes. The more income you have, the more of your Social Security becomes subject to tax.

This happens because the IRS uses a calculation called combined income, which includes your adjusted gross income, tax-exempt interest, and half of your Social Security benefits. If your combined income exceeds a certain threshold (which varies by filing status), up to 50 percent or 85 percent of your Social Security becomes taxable.

A pension can easily push you over that threshold, especially if you also have investment income or part-time earnings. This is one reason to review your tax situation with a professional before you retire, so you understand how your pension will interact with your other income sources.

Withholding and estimated taxes

Your pension payer will withhold federal income tax from your payments if you ask them to, but withholding is optional. Some retirees choose not to have taxes withheld and instead pay estimated taxes quarterly using Form 1040-ES. Others have taxes withheld from their pension and also make quarterly payments if they have other income.

If you do not have enough tax withheld during the year, you may owe a penalty when you file your return, even if you ultimately get a refund. To avoid this, you can adjust your withholding on Form W-4P or make quarterly estimated tax payments. Your pension payer can tell you how to change your withholding, or you can contact the IRS for guidance on estimated taxes.

Some retirees also receive a pension and work part-time. In that case, you may have withholding from both your job and your pension, which can complicate your tax situation. A tax professional can help you coordinate withholding across multiple income sources.

State and local income taxes on pensions

In addition to federal income tax, some states and cities tax pension income. A few states — including Illinois, Mississippi, and Pennsylvania — do not tax pension income at all. Most other states tax pensions the same way the federal government does: as ordinary income. A handful of states tax only pensions from government employers, not private pensions.

Your pension payer may withhold state and local taxes if you request it on your W-4P form, but you need to know your state's rules. If you move to a different state after you retire, your tax situation may change. Some states do not tax pensions for residents who were already retired when they moved there, but the rules vary widely.

Check your state's tax agency website or ask your pension payer which state taxes apply to your pension. If you live in one state and your pension is from an employer in another, you may owe taxes to both.

Frequently Asked Questions

Do I have to pay taxes on my entire pension?

Not necessarily. If you contributed after-tax money to your pension, that portion is not taxable. You can exclude your contributions using Form 8606. However, the employer's contributions and all investment earnings are taxable. Most people do pay tax on the majority of their pension.

What if my pension payer did not withhold enough tax?

You will owe the difference when you file your tax return. To avoid this in future years, you can adjust your withholding on Form W-4P or make quarterly estimated tax payments. Contact your pension payer to change your withholding, or file Form 1040-ES to pay estimated taxes.

Can I avoid paying taxes on my pension by rolling it into an IRA?

Rolling a pension into an IRA does not eliminate taxes — it defers them. You still owe income tax when you withdraw money from the IRA. Some pensions cannot be rolled over; others can only be rolled into specific types of IRAs. Ask your pension payer whether a rollover is an option for you.

Will my pension affect my Medicare premiums?

Yes. Medicare premiums are based on your income from two years prior. A pension increases your income, which can raise your Part B and Part D premiums. This is called Income-Related Monthly Adjustment Amount (IRMAA). Review your income carefully if you are turning 65 and starting Medicare.

What is the difference between a pension and Social Security?

A pension is paid by an employer or union based on your work history with that specific employer. Social Security is a federal program funded by payroll taxes and available to most workers. Both are taxable, but they are calculated differently and have different rules for taxation and survivor benefits.