Will Your Social Security Be Taxed If You Have a FERS Pension? 2026 Combined Income Rules

‍

Yes, your Social Security benefits can be taxed if you have a FERS pension (Federal Employees Retirement System). The question of Social Security tax with a federal pension comes down to one number: your combined income. The taxable portion of your FERS annuity counts as ordinary income. That raises your combined income, which can make 50% to 85% of your Social Security benefit taxable at the federal level. This guide explains how the 2026 combined income rules work, why FERS income can push you over the thresholds, and how the numbers break down.
‍

What Combined Income Means for Social Security Tax with a Federal Pension
‍

Combined income, also called provisional income, is the figure the Internal Revenue Service (IRS) uses to decide how much of your Social Security is taxable. The formula is straightforward. Take your adjusted gross income (excluding Social Security), add any tax-exempt interest, then add one-half of your annual Social Security benefit. This is the standard simplified formula. Certain excluded income items can require additional adjustments under IRS Publication 915.
‍

For federal retirees, the critical point is that the taxable portion of your FERS annuity generally enters adjusted gross income and can increase your combined income. Part of a FERS annuity may represent a tax-free recovery of your previously taxed employee contributions, and that portion doesn't count.
‍

The same principle applies to a traditional TSP (Thrift Savings Plan), the federal government's tax-advantaged retirement savings program. The taxable portion of a traditional TSP distribution generally enters adjusted gross income and can therefore increase combined income. These income sources are common reasons a FERS retiree's combined income rises toward or past the taxation thresholds. Understanding this formula is important when planning withdrawals and estimating how much of your Social Security may be taxable.
‍

The 2026 Combined Income Thresholds
‍

The IRS applies three fixed tiers to your combined income. Below the lower threshold, none of your Social Security is taxed. Between the two thresholds, up to 50% becomes taxable. Above the upper threshold, up to 85% becomes taxable.
‍

According to IRS Publication 915, for 2026 the Social Security taxation thresholds remain $25,000 and $34,000 for single filers, heads of household, and qualifying surviving spouses. For married couples filing jointly, they remain $32,000 and $44,000.
‍

Here is how the 2026 thresholds map to each filing status:

‍

‍

Source: IRS Publication 915. These statutory Social Security taxation thresholds remain unchanged for 2026. The married-filing-separately rules are an important exception federal couples should confirm against their own return.
‍

One detail matters enormously for your planning: these thresholds aren't indexed to inflation. The $25,000 and $32,000 base amounts date to the 1983 Social Security amendments. The $34,000 and $44,000 higher thresholds and the 85% rule were added in 1993.
‍

Because they've never been adjusted since, benefit and income growth can push more retirees across them over time. The Social Security Administration reports that the 2026 cost-of-living adjustment (COLA) was 2.8%. So a retiree who sat below a threshold last year may cross it this year through no change in behavior.
‍

Why FERS Income Can Push Combined Income Above the Thresholds
‍

Your Social Security benefits can become taxable when your combined income exceeds the applicable IRS thresholds. FERS is a three-part system. Two of those parts, the annuity and the TSP, can add taxable income that feeds directly into the combined income formula.
‍

The FERS annuity is the first driver. Under FERS, the standard annuity formula is 1% of your High-3 average salary multiplied by your years of service. It rises to 1.1% if you retire at age 62 or older with at least 20 years of service. Your High-3 is your highest average basic pay over any three consecutive years of creditable service.
‍

This is the standard formula for regular FERS employees. Certain special-provision employees, such as law enforcement officers, firefighters, and air traffic controllers, use different annuity formulas. For a career federal employee, the taxable portion of this annuity alone can approach or exceed the $25,000 single-filer threshold before Social Security or TSP is even counted.
‍

The TSP is the second driver. The taxable portion of a traditional (pre-tax) TSP distribution counts toward adjusted gross income and therefore toward combined income. If you take required minimum distributions from a large traditional TSP balance, you can add tens of thousands of dollars to combined income annually.
‍

Add Social Security itself as the third leg, and the interaction is clear. A single FERS retiree with a $30,000 annuity, a traditional TSP withdrawal, and a Social Security benefit can easily land in the 85% taxation tier. The federal retirement system provides stable, layered income, and that layering is exactly what can push your combined income past the fixed thresholds.
‍

A Worked Example: Single FERS Retiree
‍

Consider a single FERS retiree, age 66, with the following 2026 income:
‍

• Taxable FERS annuity amount: $32,000
• Taxable traditional TSP distribution: $10,000
• Annual Social Security benefit: $24,000

Assume both the annuity and TSP amounts shown are fully taxable for this example. To find combined income, add the annuity and TSP withdrawal ($42,000), then add half of the Social Security benefit ($12,000). Combined income is $54,000.

That figure sits well above the $34,000 upper threshold for single filers. So up to 85% of the $24,000 benefit, as much as $20,400, becomes taxable and is added to ordinary income.

Here's what the 85% figure means. The IRS treats 85% as the maximum portion of benefits that can be taxed, not the tax rate itself. The taxable portion is added to your income and taxed at your ordinary income tax rate. Under current federal law, no more than 85% of Social Security benefits can be included in taxable income, no matter how high your FERS annuity and TSP withdrawals run.

FERS vs. CSRS: Does the Retirement System Change the Tax?

Many federal retirees ask whether the older CSRS (Civil Service Retirement System) is treated differently from FERS for Social Security tax purposes. The federal tax rules on Social Security are identical regardless of which system you retired under. The combined income formula and thresholds don't change. What differs is how much Social Security you have to tax in the first place.
‍

‍

To be precise about CSRS: Social Security isn't a core component of regular CSRS. CSRS retirees may still qualify for Social Security based on other Social Security-covered work or other eligibility, and CSRS Offset employees are covered by Social Security during their offset service. Where a CSRS retiree does receive Social Security, the same combined income formula and thresholds apply.
‍

One current-rules development matters here. The Social Security Administration reports that the Social Security Fairness Act, signed into law on January 5, 2025, repealed the Windfall Elimination Provision (WEP) and the Government Pension Offset (GPO) for benefits payable beginning in January 2024. Those provisions no longer reduce Social Security benefits because of a CSRS pension, and the SSA specifically lists CSRS-covered federal employees among those affected by the repeal.
‍

The takeaway is not about the tax rule. Social Security is a core component of FERS, while it is not a core component of regular CSRS. When a retiree receives Social Security, the same combined-income rules apply.
‍

Does the New OBBBA Senior Deduction Eliminate the Tax?
‍

A widespread myth in 2026 is that recent legislation made Social Security tax-free for seniors. The One Big Beautiful Bill Act (OBBBA) did not make Social Security tax-free. The combined income thresholds and the 50%/85% tiers remain fully in force.
‍

What OBBBA created is a separate senior deduction. The IRS allows eligible taxpayers age 65 or older to claim an enhanced deduction of up to $6,000 per person, or up to $12,000 when both spouses qualify and file a joint return, for tax years 2025 through 2028.
‍

You can claim the deduction whether you take the standard deduction or itemize, and each qualifying individual must have a valid Social Security number. The deduction is reduced by 6% of modified adjusted gross income (MAGI) above $75,000 for single filers and $150,000 for joint filers. Under the IRS calculation, the deduction phases out fully at $175,000 of MAGI for a single filer and $250,000 for joint filers. This $250,000 ceiling applies even when both spouses qualify, because each spouse's $6,000 amount is reduced in parallel against the same MAGI.
‍

For you as a FERS retiree, the deduction can reduce your overall taxable income, and in some cases push a lower-income retiree's total tax toward zero. But it doesn't change whether your Social Security benefit is taxable under the combined income test. Those are two separate calculations. Don't assume the deduction erases your Social Security tax. Run the actual numbers.
‍

How FERS Retirees Can Manage Combined Income
‍

Combined income is the trigger. Planning can be especially useful when your income sits near one of these thresholds. Federal Employee Advisor Network, a retirement planning firm specializing in federal employee benefits, works with retirees to sequence withdrawals so that combined income stays as low as feasible in a given year.
‍

Several levers exist. Qualified Roth TSP distributions and tax-free Roth IRA distributions generally don't increase adjusted gross income, so they generally don't increase combined income. Building a Roth balance during your working years gives you an income source that doesn't push you toward the thresholds. Taxable amounts from nonqualified Roth distributions can still affect the calculation, so the distribution must be qualified to get the full benefit.
‍

Timing large traditional TSP withdrawals in lower-income years and coordinating a spouse's income can shift combined income across threshold lines. Depending on your circumstances, delaying your own Social Security retirement benefit beyond full retirement age and up to age 70 can increase your eventual monthly retirement benefit, while drawing from other assets earlier may change future combined income. Federal Employee Advisor Network models these scenarios against each retiree's specific annuity and TSP balances rather than applying generic rules of thumb.
‍

The Bottom Line for Federal Retirees
‍

Many FERS retirees may owe tax on their Social Security benefits, because the taxable portion of a FERS annuity and traditional TSP distributions can increase combined income. And because the 2026 thresholds of $25,000 (single) and $32,000 (joint) haven't moved in decades, income that once stayed below the line can cross it over time.
‍

The rules are fixed, but your income timing is not. Coordinating when and how you draw from each source is where meaningful tax savings live. Federal Employee Advisor Network, a retirement planning firm specializing in federal employee benefits, helps federal employees build a withdrawal strategy tailored to their annuity, TSP, and Social Security so they keep more of what they earned.
‍

Frequently Asked Questions
‍

1. Will my Social Security be taxed if I have a FERS pension?

It can be. The taxable portion of your FERS annuity counts toward combined income, which can push you above the IRS thresholds. Once combined income exceeds $25,000 for single filers or $32,000 for joint filers, up to 50% of your Social Security becomes taxable, rising to 85% at higher income.
‍

2. How is combined income calculated for Social Security tax?

Combined income equals your adjusted gross income (excluding Social Security), plus any tax-exempt interest, plus one-half of your annual Social Security benefit. For FERS retirees, adjusted gross income can include the taxable portion of your FERS annuity and taxable traditional TSP distributions, which can increase combined income.
‍

3. What is the maximum amount of Social Security that can be taxed?

Up to 85% of your Social Security benefit can be taxed at the federal level, according to the IRS. Under current federal law, no more than 85% of Social Security benefits can be included in federal taxable income. The 85% figure is the maximum taxable portion, not the tax rate.
‍

4. Did the OBBBA make Social Security tax-free?

No. The One Big Beautiful Bill Act created a separate $6,000 senior deduction for filers age 65 and older, but it didn't change the combined income thresholds or the rules taxing Social Security benefits. Your benefit can still be taxed up to 85% based on combined income in 2026.
‍

5. Can I collect FERS and Social Security at the same time?

Yes. If you're eligible for Social Security, you can receive Social Security benefits while also receiving your FERS annuity, since FERS combines the annuity, Social Security, and the Thrift Savings Plan. Both are income sources that can raise your combined income and affect how much of your benefit is taxed.
‍

6. Do Roth TSP or Roth IRA withdrawals affect combined income?

Qualified Roth TSP distributions and tax-free Roth IRA distributions generally don't increase adjusted gross income, so they generally don't increase combined income, according to IRS guidance. Taxable amounts from a nonqualified Roth distribution can increase it. This makes Roth accounts a valuable tool for federal retirees who want to draw income without pushing themselves over the taxation thresholds.

‍

Disclaimer

This article is for informational and educational purposes only and does not constitute individualized financial, tax, legal, or retirement benefits advice. Social Security, FERS, TSP, and tax rules can change. Verify current information with IRS.gov, SSA.gov, OPM.gov, and TSP.gov, and consult a qualified professional regarding your individual circumstances.