TSP Withdrawal Tax Rate: How Much Federal Tax You'll Owe on Distributions

The Short Answer: It Depends on How You Take the Money

There's no single "TSP tax rate." What you owe depends on the type of withdrawal, whether it comes from your traditional or Roth balance, and your total income for the year. The TSP handles withholding automatically, but the withholding rate and your actual tax rate are two different things.

Here's how the system works.

Traditional TSP: Taxed as Ordinary Income

Every dollar you withdraw from your traditional TSP is taxed as ordinary income — the same rates that apply to wages. In 2026, the federal income tax brackets for a single filer range from 10% to 37%, and for married filing jointly from 10% to 37% on income above $751,600.

A $40,000 TSP withdrawal doesn't automatically get taxed at one rate. It stacks on top of your other taxable income for the year — your FERS annuity, Social Security (up to 85% is taxable), any wages, investment income — and each portion fills the next bracket.

If your FERS annuity and Social Security already put you at $60,000 of taxable income, a $40,000 TSP withdrawal pushes your total to $100,000. For a single filer in 2026, that means the first portion of the withdrawal fills the 22% bracket and the rest may spill into the 24% bracket.

The Mandatory 20% Withholding Rule

For single lump-sum distributions and installment payments scheduled to last fewer than 10 years, the TSP withholds a mandatory 20% of the taxable amount for federal income taxes. This is a regulatory floor — you cannot reduce it below 20% for these distribution types.

This withholding is not your tax rate. It's an advance payment toward your tax bill. If your actual effective rate is 15%, you'll get the excess back as a refund when you file. If your effective rate is 28%, you'll owe the difference.

For a $100,000 partial withdrawal from a traditional TSP balance, the TSP sends you $80,000 and remits $20,000 to the IRS. Your Form 1099-R at tax time shows the $100,000 gross distribution and $20,000 withheld.

Installment Payments: A Different Withholding Default

If you set up installment payments scheduled to last 10 years or longer — or payments calculated based on IRS life expectancy tables — the withholding rules change. These are treated as periodic payments, and the TSP defaults to withholding at the rate for a married filer with three dependents.

This default often undertaxes retirees, especially single filers or those with significant income from other sources. The TSP lets you adjust the withholding rate through the My Account portal using W-4P equivalent settings. You can increase withholding, decrease it, or in some cases elect to have no federal tax withheld (though you'd still owe the taxes when you file).

Getting this right matters. If your withholding is too low, you'll face a large tax bill — and potentially an underpayment penalty — at filing time. If it's too high, you've given the IRS an interest-free loan.

Roth TSP: Usually Tax-Free

Qualified withdrawals from your Roth TSP are completely tax-free — both the contributions and the earnings. A withdrawal qualifies when you're 59½ or older (or disabled, or it's a death benefit distribution) and your Roth TSP has been open for at least five years.

If you meet both conditions, a $100,000 Roth TSP withdrawal adds exactly $0 to your taxable income. No withholding, no tax bill, no impact on your Medicare IRMAA bracket.

Non-qualified Roth withdrawals are partially taxable. The contributions portion comes out tax-free (you already paid taxes on it), but the earnings portion is taxed as ordinary income and may face the 10% early withdrawal penalty if applicable.

State Taxes: Another Layer

The TSP withholds federal taxes only — it doesn't withhold state income taxes. Most states tax TSP distributions as ordinary income, but several don't tax retirement income at all or offer significant exemptions for government pensions.

States with no income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming. Several other states — Illinois, Mississippi, Pennsylvania among them — fully exempt federal retirement income.

If your state does tax retirement distributions, you're responsible for making estimated state tax payments or adjusting withholding from other income sources. The TSP won't do it for you.

Direct Rollovers: No Tax at All

If you roll your TSP balance directly to an IRA or another eligible employer plan through a trustee-to-trustee transfer, no tax is withheld and no tax is owed. The money moves between accounts without being treated as a distribution.

This is one of the strongest reasons to use a direct rollover rather than an indirect one. With an indirect rollover, the TSP withholds the mandatory 20% — and you have to come up with that 20% from personal funds within 60 days to complete a tax-free transfer.

Managing Your Tax Bracket

The biggest tax mistake retirees make is taking a large lump-sum distribution in a single year, which can push them into a much higher bracket than necessary. A retiree whose normal taxable income puts them in the 22% bracket could jump to 32% or higher with one large withdrawal.

Strategies to manage bracket exposure include:

• Spread withdrawals across multiple tax years rather than taking one large distribution.
• Use Roth TSP withdrawals for large expenses — they don't increase your AGI.
• Time conversions and distributions around years with lower income (like the gap between separation and Social Security).
• Watch the IRMAA cliff. Traditional TSP withdrawals increase MAGI, which determines Medicare Part B and Part D premiums two years later.

Planning Your Tax-Efficient Drawdown

The TSP Withdrawal & Drawdown Strategy Guide covers the full tax landscape — withholding elections, bracket management, Roth conversion timing, and how to coordinate TSP distributions with your FERS annuity and Social Security to minimize your lifetime tax burden.

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