How Much of Your Social Security Is Taxed?

A common retirement surprise: Social Security benefits can be taxed. Not always, and rarely in full, but depending on your other income, up to 85 percent of your benefit can be subject to income tax. The rules are quirky and decades old, but understanding them lets you plan withdrawals to keep more of your benefit.

Here is how the taxation works and what you can do about it.

How the thresholds work

The IRS looks at your provisional income, roughly your other income plus half your Social Security benefit. Below a first threshold, none of your benefit is taxed. Above it, up to 50 percent becomes taxable; above a higher threshold, up to 85 percent does. Crucially, it is never 85 percent as a tax rate, it means up to 85 percent of the benefit is included in your taxable income, then taxed at your ordinary rate.

Enter your income and benefit above to see how much of your Social Security is taxable in your situation.

Why it catches people out

The thresholds were set decades ago and have never been adjusted for inflation, so more retirees cross them every year. A part-time job, a pension, required minimum distributions from a traditional IRA, or investment income can all push provisional income up and pull more of your benefit into the taxable column, often unexpectedly.

How to plan for it

Because the tax depends on your other income, you have levers. Roth withdrawals do not count toward provisional income, so a pool of Roth savings gives you tax-free income that does not trigger benefit taxation. Managing the timing of IRA withdrawals, and sometimes converting to Roth before claiming, can keep provisional income lower. Coordinating when you claim and when you draw from which account is where real savings hide.

Estimate your situation above, and consider how Roth savings and withdrawal timing could lower the bill.

Frequently asked questions