Federal Take-Home Pay Explained: Where Every Dollar of a GS Paycheck Actually Goes (2026)

Data current as of 2026 · Sources: IRS · OPM · TSP

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Federal-specific paycheck estimator with correct FERS contribution, Traditional vs. Roth TSP, FEHB premium conversion, and 2026 tax brackets.

Federal take-home pay, defined: Take-home (net) pay is your gross biweekly salary minus federal income tax, FICA (Social Security and Medicare), the FERS employee contribution, TSP contributions, FEHB and other insurance premiums, and any state tax. For most federal employees it lands between 60% and 70% of gross, depending on TSP elections, health plan, and state.

Who This Article Is For

• New hires staring at their first LES wondering where a third of their salary went
• Feds comparing a federal offer to a private-sector one and needing the real net-to-net comparison
• Employees deciding between Roth and Traditional TSP who want to see the paycheck difference
• Anyone who's heard "FEHB is pre-tax" and "FERS is pre-tax" and wants to know that only one of those is true
• Mid-career employees checking whether their withholding roughly matches their real 2026 tax liability

1. The Deduction Stack, in Order of Tax Treatment

Every deduction on a federal LES belongs to one of three tax categories, and this single distinction explains most paycheck confusion:

Reference table, not a personalized tax calculation. The effective discount column assumes the 22% federal bracket — your actual savings depend on your total income, filing status, and state taxes.

Three takeaways before we run any numbers:

• FEHB is the most tax-advantaged dollar in the federal package. Under IRS premium conversion, it escapes income tax and the 7.65% FICA — a benefit almost no private plan matches.
• The FERS contribution is not pre-tax. Post-2013 hires pay 4.4% of gross with fully-taxed dollars. (You get it back in retirement as the small tax-free portion of your annuity — but today, it's an after-tax deduction.)
• Traditional TSP lowers your income tax bill today; Roth doesn't. That's the whole paycheck difference between them — the retirement difference is covered in our Roth vs. Traditional guide.

2. The FERS Deduction: 0.8%, 3.1%, or 4.4%?

Your mandatory pension contribution depends on when you were first hired into federal service:

Same pension formula, very different price — a post-2013 GS-12 pays about $5,100/year for the same benefit a 2010 hire gets for $930. It stings, but keep the frame honest: 4.4% of salary is still a fraction of what an annuity paying 1% of High-3 per year of service, with survivor options and COLAs, would cost to buy privately.

3. FICA: The Part That Ignores Your TSP

Social Security (6.2%) applies up to the 2026 wage base of $184,500; Medicare (1.45%) has no cap, plus an additional 0.9% above $200,000 single / $250,000 married filing jointly. The subtlety: FICA is computed on your salary minus FEHB only. Traditional TSP does not reduce FICA — you pay Social Security tax on money you won't income-tax until retirement. (Silver lining: those dollars still count toward your Social Security earnings record.)

4. Worked Example: A GS-12 Paycheck, Line by Line

Illustrative example. GS-12 Step 5, Washington–Baltimore locality ($116,071 — from the 2026 GS tables), single filer, post-2013 hire (4.4% FERS), $500/pay period Traditional TSP, $120/pay period FEHB self-only, no state tax shown. Computed with the same logic as our Take-Home Pay Calculator, using the 2026 standard deduction ($16,100 single) and brackets. Your numbers will differ. Not tax advice.

Things worth noticing in that table:

• The effective federal income tax rate is 11.4%, not 22%. The 22% bracket is marginal — it applies only to the last dollars. The standard deduction and the 10%/12% brackets below do a lot of quiet work.
• The TSP election is the biggest lever you control. Drop the TSP to the 5%-match minimum (~$223/PP) and take-home jumps by about $216/PP after tax — but at the cost of $7,200/year of retirement savings and its growth.
• "Retirement" already claims 21.8% of this paycheck (FERS 4.4% + TSP 11.2% + Social Security 6.2%) — before a dollar of income tax. That's not money lost; it's three separate future income streams being funded. But it explains the gross-to-net gap better than taxes do.

5. What This Means for a Private-Sector Comparison

When a recruiter offers "$130,000 — more than your government salary," the honest comparison is net-to-net plus benefits, not gross-to-gross:

• The private salary carries the same FICA, similar income tax, and — to match your federal package — needs 401(k) contributions in place of TSP plus whatever a comparable health plan costs after tax (most private premiums are pre-income-tax but the employer subsidy varies enormously).
• Nothing in the private paycheck buys a defined-benefit pension. The 4.4% FERS line disappears — along with the annuity it was purchasing. Our GS-12 total compensation analysis prices the full package if you're doing this comparison seriously.

6. Levers That Actually Move Your Net Pay

In rough order of impact for a typical mid-career fed:

1. TSP amount and type. Every $100 of Traditional TSP costs only $78 of take-home at the 22% margin. Switching that $100 to Roth costs the full $100 now — same paycheck logic, opposite retirement logic.
2. FEHB plan choice. Because premiums escape income tax and FICA, a $40/PP cheaper plan raises take-home by about $28 — and plan differences of that size are common in Open Season.
3. Withholding accuracy (W-4). Withholding is an estimate of your real liability. A large refund every April is an interest-free loan you made to Treasury; adjust the W-4 rather than celebrating it.
4. State of residence. A flat 5% state tax on the example above takes another ~$192/PP. In retirement this lever gets bigger — several states exempt federal pensions entirely.
5. FEGLI elections. Option B costs rise steeply with age; many long-tenured feds are paying for coverage they priced at 40.

Frequently Asked Questions

What percentage of a federal salary is take-home pay? Typically 60–70% of gross, depending mostly on your TSP contribution, health plan, and state income tax. The GS-12 example above nets 62.9% with an 11.2%-of-salary TSP election.

Is the FERS contribution pre-tax? No. The 0.8%/3.1%/4.4% FERS deduction is taken after tax — it reduces neither income tax nor FICA. In retirement, the portion of your annuity representing these already-taxed contributions comes back tax-free.

Are FEHB premiums pre-tax? Yes, doubly so for active employees: under premium conversion they're excluded from federal income tax and FICA. (Note for planning: in retirement, FEHB premiums are deducted from your annuity after tax.)

Does Traditional TSP reduce Social Security tax? No. Traditional TSP reduces federal (and generally state) income tax only. FICA is computed before TSP comes out.

Why is my effective tax rate lower than my bracket? Your bracket is the rate on your last dollar. The standard deduction ($16,100 single in 2026) and the lower brackets beneath yours pull the average rate well below the marginal rate — 11.4% vs. 22% in our example.

What are the FERS contribution tiers? 0.8% if first hired before 2013 (FERS), 3.1% if hired during 2013 (FERS-RAE), 4.4% if hired 2014 or later (FERS-FRAE). Same pension formula in all three cases.

How much Social Security tax do federal employees pay? The standard 6.2% on wages up to $184,500 (2026), plus Medicare at 1.45% with no cap. FERS employees are fully covered by Social Security — unlike CSRS employees, who weren't.

Does a bigger TSP contribution lower my taxes? Traditional TSP, yes — each dollar contributed avoids income tax at your marginal rate this year. Roth TSP doesn't change this year's tax; its benefit arrives at withdrawal.

The Bottom Line

The gap between a GS salary and a GS paycheck isn't mysterious — it's seven deductions with three different tax treatments. FEHB escapes everything; Traditional TSP escapes income tax; the FERS contribution escapes nothing. Once you see that roughly a fifth of gross is funding three separate retirement income streams — pension, TSP, Social Security — the 63% net stops looking like leakage and starts looking like a ledger. Know your marginal rate, aim every deduction at its most tax-efficient slot, and read the LES like it's telling you something — because it is.

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