Quick Read
Up to 85% of Social Security benefits can become taxable once provisional income rises above $34,000 for single filers or $44,000 for married couples.
Provisional income is calculated by adding adjusted gross income, tax-exempt interest, and 50% of your yearly Social Security benefits.
Holding retirement money in a Roth IRA or Roth 401(k) can help keep withdrawals out of provisional income calculations and potentially reduce Social Security taxes.
Many people qualify for Social Security in retirement by working and paying payroll taxes on their earnings. Some benefits, such as spousal benefits, can be claimed without a personal work history. Even so, the main path to Social Security is usually paying in enough through the payroll tax system to qualify.
That can lead to a surprise: those benefits are not always tax-free once you begin collecting them.
Depending on your overall income, as much as 85% of your Social Security benefit may be subject to federal tax. Understanding the rules can help you plan ahead.
Why Social Security benefits can be taxed
The tax on Social Security benefits was introduced in 1983, when Congress sought to treat these payments more like other forms of retirement income, including private pensions, which are generally taxable.
There is also a funding angle. Although payroll taxes provide most of Social Security’s revenue, the program also receives money from taxes collected on benefits. That may be unwelcome news for some recipients, but it helps support the system.
When the tax applies
You are not automatically taxed on Social Security. Whether you owe tax depends on your provisional income, which includes your adjusted gross income, tax-exempt interest, and half of your annual Social Security benefits.
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For single filers, provisional income between $25,000 and $34,000 can make up to 50% of Social Security benefits taxable. For married couples filing jointly, that 50% threshold applies when provisional income falls between $32,000 and $44,000.
Once provisional income goes above $34,000 for a single filer, as much as 85% of Social Security benefits can be taxed. For married couples filing jointly, that higher tax level can kick in once provisional income rises above $44,000.
The frustrating part is that these thresholds are very low and easy to hit. They have not been adjusted for inflation in decades.
But that is by design. Lawmakers have been unwilling to raise the thresholds because Social Security needs funding to remain solvent.
Ways to reduce Social Security taxes
If you would rather avoid paying tax on your benefits, there are steps that may help. One option is to keep retirement savings in a Roth IRA or Roth 401(k), since qualified Roth withdrawals are tax-free and do not count toward provisional income.
If that is not an option, another strategy is to do a Roth conversion before you start claiming Social Security. That may let you take future withdrawals without increasing provisional income.
Roth conversions, however, can trigger taxes when you make them, so they need to be handled carefully. You would not want to create a large tax bill while moving money into a Roth account.
You can also try to limit withdrawals from traditional IRAs or 401(k)s if you are not yet required to take required minimum distributions, or RMDs. Once those distributions begin, you have less flexibility over how much income you take from savings.
For people born before 1960, RMDs begin at age 73. Social Security can be claimed as early as age 62, so there may be a window where careful withdrawal planning can help.
Taxes on Social Security benefits can be frustrating, especially since you worked to earn those benefits. But the rules are unlikely to change soon, so it pays to understand them and plan ways to reduce what you owe.
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