As your first year of retirement progresses, it’s important to evaluate whether the financial plan you laid out to ensure your sustainable well-being is going according to plan. An appropriate plan should include tax calculations to understand how much of your income will truly be at your disposal for needs and wants. 

Some people may think that because you pay for Social Security benefits throughout your lifetime via payroll taxes, it’s a tax-free benefit. However, this is often not the case. Both the amount of your Social Security benefits subject to taxes and the tax rate itself will depend on a handful of factors personal to your situation.

How Your Social Security Benefits Are Taxed

In short, you might pay taxes on 0%, 50% or 85% of your Social Security retirement benefits. This is depending on your provisional income, though:

Provisional income = Taxable income + Tax-exempt interest + ½ of annual Social Security benefits

You then would compare your provisional income to that year’s income threshold to determine what portion of your Social Security benefits will be taxed. Your tax rate will be your marginal rate. For a single filer, the thresholds are as follows for the 2023 tax year:

For example, if you had $25,000 in 401(k) withdrawals, $5,000 in tax-exempt bond interest and $29,000 in annual Social Security benefits, your provisional income would be:

$25,000 + $5,000 + (½ x $29,000) = $44,500

Because this is beyond the $34,000 income threshold, 85% of your Social Security income will be taxed. 

So, nearly $25,000 of your Social Security benefits ($29,000 x 0.85 = $24,650) for the year would be taxable in this case. Again, that’s only the amount of money you’ll be charged taxes on – not what you’re actually paying in taxes. The other roughly $4,000 would be tax-free.