Last Updated: September 9, 2026

Federal retirees face a unique tax challenge that most Americans don't: multiple income streams that stack together and push you into higher brackets. Your FERS pension, TSP withdrawals, and Social Security all hit at once, and the IRS doesn't give you a break for planning well.

The good news? 2026 brings some opportunities. A new $6,000 senior deduction, TSP Roth in-plan conversions launching January 28, and strategies that can save you tens of thousands over your retirement. The bad news? Social Security taxation thresholds haven't changed since 1984, and IRMAA can cost you over $1,000 per year if you're just $1 over the threshold.

This guide covers exactly how each income source is taxed, what changed for 2026, and the strategies that actually work for federal retirees.

How Each Federal Income Source Is Taxed

Understanding how each piece of your retirement income is taxed is the foundation of smart planning.

FERS Pension: ~95% Taxable

Your FERS annuity is mostly taxable as ordinary income. The small tax-free portion represents your prior after-tax contributions, recovered over your life expectancy.

Component Tax Treatment
Monthly annuity ~95% taxable as ordinary income
Tax-free portion Your prior contributions ÷ life expectancy months
Form you receive 1099-R from OPM (Box 2a shows taxable amount)

The IRS uses the Simplified Method: divide your total after-tax contributions by expected payments based on your retirement age. For a single-life annuity, the expected-payment count comes from IRS Publication 575 Table 1: 360 for retirees 55 and under, 310 for ages 56 to 60, 260 for ages 61 to 65, 240 for 66 to 70, and 210 for 71 and older. If you elected a survivor annuity, use Table 2 instead, which is keyed to the combined ages of you and your survivor and gives a larger count. A retiree at 62 with $30,000 of after-tax contributions divides by 260, so $115 of each monthly payment is tax-free. Only a small fraction of each payment escapes tax.

FERS Supplement: 100% Taxable

Here's what catches many early retirees off guard: the FERS Supplement is 100% taxable.

Component Tax Treatment
Monthly supplement 100% taxable as ordinary income
Earnings test Reduced $1 for every $2 earned above $24,480
Duration Paid until the month you turn 62

Critical difference from Social Security: The FERS Supplement has no "return of contribution" component. Every dollar is taxable. Meanwhile, actual Social Security is only up to 85% taxable depending on your income.

TSP Withdrawals: Depends on Account Type

Account Type Tax Treatment
Traditional TSP 100% taxable as ordinary income
Roth TSP (qualified) 100% tax-free
Roth TSP (unqualified) Contributions tax-free; earnings taxable, plus the 10% additional tax unless a 72(t) exception applies (age-55 separation, disability, death)

Qualified Roth: You must be 59 1/2 or older (or the distribution is made after your death or because of your disability) AND it must be at least 5 years since your first Roth TSP contribution.

Age 55 exception: If you separate from federal service in or after the calendar year you turn 55 (age 50 for eligible public safety employees), you can withdraw from TSP without the 10% early withdrawal penalty. This does NOT apply if you roll to an IRA.

Withholding is not the same as your tax. TSP must withhold 20% federal tax on any withdrawal or installment schedule expected to last fewer than 10 years, because the IRS treats those as eligible rollover distributions. You can elect more than 20% but not less, and you cannot waive it, even when 20% is far above your bracket. Installments spread over 10 or more years, or based on life expectancy, skip the mandatory 20% and use W-4P-style withholding instead. The difference between withheld and owed is settled on your return.

Social Security: Up to 85% Taxable

Social Security taxation thresholds haven't changed since 1984. That means more retirees get taxed every year.

Combined Income (Single) Taxable Portion
Under $25,000 0% taxable
$25,000 - $34,000 Up to 50% taxable
Over $34,000 Up to 85% taxable
Combined Income (MFJ) Taxable Portion
Under $32,000 0% taxable
$32,000 - $44,000 Up to 50% taxable
Over $44,000 Up to 85% taxable

Combined income formula: AGI + tax-exempt interest + 1/2 of Social Security benefits

Reality for federal retirees: Most FERS retirees with a pension, TSP, and Social Security will have combined income well above these thresholds. That means 85% of your Social Security is taxable.

The $6,000 Senior Deduction: New for 2025-2028

The One Big Beautiful Bill Act added a temporary deduction for taxpayers 65 and older. This is on top of the standard deduction.

Eligibility Requirements

Requirement Details
Age 65 or older by December 31
Filing status Single, HOH, MFJ, or surviving spouse (NOT married filing separately)
Income limit Phases out above $75,000 (single) / $150,000 (MFJ)
Phase-out rate Reduced $0.06 for every $1 over threshold

How It Affects Federal Retirees

Scenario Deduction Amount
Single retiree, $60,000 MAGI Full $6,000
Single retiree, $80,000 MAGI $5,700 (reduced by $300)
MFJ couple, $175,000 MAGI $4,500 (reduced by $1,500)
MFJ couple, $250,000 MAGI $0 (fully phased out)

Planning opportunity: Reducing your MAGI through TSP contributions, Roth conversions in earlier years, or deferring income can maximize this deduction.

Sunset warning: This deduction expires after 2028 unless Congress extends it.

IRMAA: The Hidden Tax on Federal Retirees

Federal retirees are uniquely vulnerable to IRMAA (Income-Related Monthly Adjustment Amount) because your multiple income streams stack together. The higher your career salary, the more IRMAA matters, use our GS Pay Calculator to understand how your current grade and locality affect your future MAGI.

2026 IRMAA Brackets (Based on 2024 Income)

Single MAGI MFJ MAGI Part B Premium Part D Surcharge
Up to $109,000 Up to $218,000 $202.90 $0
$109,001-$137,000 $218,001-$274,000 $284.10 $14.50
$137,001-$171,000 $274,001-$342,000 $405.80 $37.50
$171,001-$205,000 $342,001-$410,000 $527.50 $60.40
$205,001-$499,999 $410,001-$749,999 $649.20 $83.30
$500,000+ $750,000+ $689.90 $91.00

Looking ahead to 2027. The Medicare Trustees project a 2027 Part B premium of $209.50, and private forecasters put it at $216 to $219. CMS publishes the official figure in November. Our 2027 Part B projection tracks it.

The Cliff Effect

Unlike tax brackets, IRMAA applies the FULL surcharge when you exceed a threshold by even $1. A $110,000 MAGI pays the same surcharge as $136,999.

Federal retiree example:

  • FERS pension: $50,000
  • Social Security: $30,000 (at most 85%, $25,500, is taxable and counts toward MAGI)
  • TSP RMD: $35,000
  • Total MAGI: about $110,500 (at most 85% of Social Security, $25,500, enters MAGI; still above the first threshold)
  • Result: $81.20/month surcharge = $974.40/year in extra Medicare costs

One-time events like a large Roth conversion, home sale, or TSP withdrawal can spike your MAGI and trigger IRMAA surcharges two years later. Plan accordingly.

State Tax Considerations

Where you live dramatically affects your retirement taxes.

States With No Income Tax (9 States)

State Notes
Alaska No income tax, no sales tax, no estate tax
Florida No income tax, moderate property taxes
Nevada No income tax, higher sales tax
New Hampshire Dividend tax repealed 2025, no sales tax
South Dakota No income tax, no estate tax
Tennessee Hall tax repealed 2021
Texas No income tax, higher property taxes
Washington No income tax, higher sales tax
Wyoming No income tax, lowest combined sales tax (5.44%)

States That Exempt Federal Pensions (8 Additional States)

State Notes
Illinois Pensions, IRAs, 401k exempt; 4.95% flat tax on other income
Pennsylvania Pensions, IRAs, Social Security exempt; 3.07% flat tax
Mississippi Pensions exempt (except early retirement)
Alabama Federal pensions exempt
Hawaii Federal pensions exempt
Iowa Federal pensions exempt for age 55+
Kansas Social Security exempt; federal civil service annuities exempt
New York Federal, state, and local government pensions fully exempt; 4% to 10.9% on other income

Michigan is the 2026 change. Its retirement-income deduction rose to $65,987 for a single filer and $131,794 for a joint return for tax year 2026, which removes state tax on the pension for nearly every federal retiree. Colorado did not change: the bill that would have removed its caps (SB25-136) died in committee in February 2025, and the subtraction stays at $20,000 for ages 55 to 64 and $24,000 at 65 and older. Georgia, Maryland, New Jersey, and Virginia offer partial exemptions worth checking against your own numbers.

States That Still Tax Social Security (8 States in 2026)

Colorado, Connecticut, Minnesota, Montana, New Mexico, Rhode Island, Utah, Vermont

West Virginia completed its phase-out of Social Security taxation as of January 2026, joining the 41 states plus DC that do not tax it.

Tax-Efficient Withdrawal Strategies

The "Stacking" Problem

Federal retirees face a unique challenge: FERS pension + Social Security + TSP RMDs all hit at once after age 73, pushing you into higher brackets.

Strategy 1: Early Retirement Roth Conversions (Ages 55-72)

The years between retirement and RMDs are often your lowest-income years. Use this window to convert Traditional TSP to Roth.

Tax Bracket 2026 Single Income Conversion Strategy
10% $0 - $12,400 Fill bracket with conversions
12% $12,401 - $50,400 Sweet spot for Roth conversions
22% $50,401 - $105,700 Still attractive for many
24% $105,701 - $201,775 Consider if RMDs will push higher

Taxable-income thresholds for a single filer under IRS Rev. Proc. 2025-32. Joint filers roughly double each line ($24,800, $100,800, $211,400, $403,550). Our TSP Roth conversion guide turns these into a year-by-year conversion ladder.

Example: A 58-year-old retiree with $30,000 FERS pension could convert $20,000 Traditional TSP to Roth, pay 12% tax now ($2,400), and have tax-free growth and withdrawals later.

New for 2026: TSP Roth in-plan conversions launch January 28, 2026. You can now convert Traditional TSP to Roth TSP directly within your account (minimum $500, max 26 conversions per year).

Strategy 2: Delay Social Security to Reduce "Triple Stack"

Claiming Age Benefit Level Tax Impact
62 70% of full benefit Adds to taxable income 5+ years longer
67 (FRA) 100% of full benefit Balanced approach
70 124% of full benefit 8% guaranteed return + delayed taxation

Federal retiree advantage: Your FERS pension and TSP can cover expenses while Social Security grows 8% per year from FRA to 70.

Strategy 3: Roth TSP for Tax-Free Income

Benefits of Roth TSP withdrawals:

  • Don't count toward IRMAA calculations
  • Don't increase Social Security taxation
  • No RMDs on Roth TSP (SECURE 2.0)
  • Provide tax diversification in retirement

Strategy 4: Income Smoothing

Avoid lumpy income years that trigger IRMAA or push you into higher brackets:

  • Spread large Roth conversions across multiple years
  • Time capital gains realizations carefully
  • Coordinate TSP withdrawals with other income sources
  • Consider QCDs (Qualified Charitable Distributions) after 70 1/2. The 2026 limit is $111,000 per person ($222,000 per couple), and a QCD must come from a traditional IRA, not from TSP directly, so the strategy requires rolling traditional TSP to an IRA after separation
  • High-income itemizers in high-tax states: the 2026 SALT deduction cap is $40,400, phasing down above $505,000 of income to a $10,000 floor

What a GS-13 Retiree Couple Actually Pays: A Computed First Year

Every source above stacks on the same return, so here is one full household under 2026 rules. A GS-13 retiree, age 58, drawing a $48,000 FERS pension (95% taxable) and a $14,000 FERS supplement, takes a $30,000 traditional TSP withdrawal. The spouse, 66, collects $18,000 of Social Security. They file jointly, and only one of them qualifies for the senior deduction.

Social Security first. Other taxable income is $89,600 ($45,600 pension plus $14,000 supplement plus $30,000 TSP). Half the Social Security is $9,000. Combined income of $98,600 is far past the $44,000 joint threshold, so the Publication 915 worksheet lands at the ceiling: $15,300 of the $18,000 is taxable. Adjusted gross income is $104,900.

Without the senior deduction With the $6,000 senior deduction (one spouse 65+)
Standard deduction (joint, 2026) $32,200 $32,200
Age-65 additional deduction (one spouse) $1,650 $1,650
OBBBA senior deduction $0 $6,000
Taxable income $71,050 $65,050
Tax at 10% (first $24,800) $2,480 $2,480
Tax at 12% (remainder) $5,550 $4,830
Federal tax $8,030 $7,310

FedTools 2026 analysis under IRS Rev. Proc. 2025-32 brackets as amended by the One Big Beautiful Bill Act. The senior deduction saves $720, which is $6,000 times the 12% marginal rate; at $104,900 of income the couple is nowhere near the $150,000 joint phase-out. Effective federal rate on $110,000 of gross income: about 7%.

One more $10,000 TSP withdrawal costs exactly $1,200. Add $10,000 of traditional TSP and taxable income moves to $75,050, still inside the 12% bracket, for $8,510 of tax. The Social Security worksheet does not move, because the couple is already at the 85% ceiling. Below that ceiling, the same $10,000 would also drag more Social Security into taxable income and cost more than its bracket rate. Above it, a withdrawal is taxed at a flat marginal rate with no hidden surcharge. Most FERS households with a pension, TSP, and Social Security stacked together sit above the ceiling, which is why bracket-fill planning works for them.

Your First Retirement Year, Month by Month

When What to do
Month 1 File a W-4P with OPM through Retirement Services Online. The default is single with zero allowances, which under-withholds nearly every married retiree. Set your TSP withholding election if you take installments.
January to February Watch for OPM's CSA 1099-R (by January 31) and TSP's 1099-R (mid-February online) for any prior-year distribution.
April 15 File, and pay the first estimated payment if withholding on pension, TSP, and Social Security together falls short. This is the most common first-year surprise.
May to June Run the IRS Withholding Estimator on a full year of pension plus TSP plus Social Security, then adjust the W-4P and TSP elections. Second estimated payment June 15.
The year you turn 65 Enroll in Medicare Part B in your Initial Enrollment Period. This year's income sets your IRMAA bracket two years out, so a large leave lump sum or Roth conversion now surfaces as a surcharge in year three.
September 15 Third estimated payment.
November CMS announces next year's Part B premium and IRMAA brackets. Re-check where your year-to-date income lands.
December Last day for a TSP Roth in-plan conversion in the tax year, for a QCD if you are 70 1/2 or older, and for the RMD unless it is your delayed first-RMD year.
The following January First full-year 1099-Rs arrive. Check Box 2a against your own Simplified Method figure before filing.

Model Your Retirement Taxes

Use the FERS Retirement Calculator to estimate your pension and see how it fits into your total retirement income. Then use the TSP Calculator to model withdrawal scenarios, and the separate TSP Roth Conversion Calculator to model Roth conversion strategies.

Planning ahead can save you tens of thousands in taxes over your retirement. The key is understanding how your income sources interact.

7 Common Tax Mistakes Federal Retirees Make

1. Taking Social Security Too Early

Problem: Claiming at 62 while still receiving FERS pension and taking TSP withdrawals creates unnecessary income stacking.

Solution: Delay Social Security to 70 if possible. Use TSP to bridge the gap.

2. Ignoring the FERS Supplement Earnings Test

Problem: Part-time work while receiving FERS Supplement can reduce or eliminate it.

2026 limit: $24,480. For every $2 earned above this, your supplement is reduced by $1.

Solution: Track earnings carefully or consider delaying additional work until after 62.

3. Not Planning for RMDs

Problem: At 73, RMDs begin whether you need the money or not. Large Traditional TSP balances create large RMDs.

Solution: Partial Roth conversions before 73 to reduce your Traditional balance.

4. Overlooking IRMAA

Problem: One-time events (Roth conversion, home sale, large TSP withdrawal) spike MAGI and trigger IRMAA surcharges 2 years later.

Solution: Plan income smoothing. Be aware of bracket cliffs.

5. Not Adjusting Withholding

Problem: FERS pension withholding is often insufficient. Retirees face surprise tax bills.

Solution: Review Form W-4P quarterly. Consider increasing TSP withholding to compensate.

6. Rolling TSP to IRA Before 59 1/2

Problem: Rolling TSP to IRA loses the age 55 penalty-free withdrawal exception.

Age 55 rule: If you separate from federal service in or after the year you turn 55, you can withdraw from TSP without the 10% penalty. IRAs require 59 1/2.

Solution: Keep money in TSP until at least 59 1/2 if you might need early access.

7. Moving to a High-Tax State

Problem: Retirees move for lifestyle without considering state tax impact.

Solution: Model your total tax burden (income + property + sales) before relocating.

Important Dates for 2026

Date Event
January 28, 2026 TSP Roth in-plan conversions begin
January 31, 2026 TSP mails 1099-R forms for 2025 distributions
April 15, 2026 Tax filing deadline
December 31, 2026 Annual RMD deadline
December 31, 2028 $6,000 senior deduction expires (unless extended)

Frequently Asked Questions

Is my FERS pension taxable?

Yes, approximately 95% of your FERS pension is taxable as ordinary income at the federal level. The small tax-free portion represents your prior after-tax contributions, recovered over your life expectancy using the IRS Simplified Method. State taxation varies, with by our count 17 states exempting qualifying federal pensions.

How is the FERS Supplement taxed differently than Social Security?

The FERS Supplement is 100% taxable as ordinary income, unlike Social Security where only up to 85% may be taxed depending on your combined income. This means every dollar of FERS Supplement adds to your taxable income until you turn 62.

What are the Social Security taxation thresholds for 2026?

For single filers, up to 50% of benefits are taxable if combined income is $25,000-$34,000, and up to 85% taxable above $34,000. For married filing jointly, the thresholds are $32,000-$44,000 (50%) and above $44,000 (85%). These thresholds have not changed since 1984, meaning more retirees get taxed every year due to inflation.

When do I have to start taking Required Minimum Distributions?

If you were born 1951-1959, RMDs begin at age 73. If born 1960 or later, RMDs begin at age 75. You can delay your first RMD until April 1 of the year after you turn the RMD age, but this means taking two RMDs in one year, which could spike your taxes. Under SECURE 2.0, Roth TSP accounts are no longer subject to RMDs.

What is the $6,000 senior deduction and do I qualify?

The One Big Beautiful Bill Act (2025) created a temporary $6,000 deduction for taxpayers 65 and older with MAGI below $75,000 (single) or $150,000 (MFJ). It phases out at $0.06 per dollar above those limits and expires after 2028. The deduction is in addition to the standard deduction.

What states are most tax-friendly for federal retirees?

Nine states have no income tax (FL, TX, NV, WA, WY, TN, SD, AK, NH). Beyond those, Pennsylvania, Illinois, and Mississippi exempt federal pensions entirely while having income taxes on other income. For 2026, 41 states do not tax Social Security benefits.

How can I avoid Medicare IRMAA surcharges?

IRMAA is based on your income from 2 years prior. For 2026 premiums, your 2024 MAGI matters. If it exceeded $109,000 (single) or $218,000 (MFJ), you'll pay higher Part B and Part D premiums. Strategies include Roth conversions before 73 (reduces future RMDs), tax-loss harvesting, and income smoothing to stay below bracket cliffs.

Do federal retirees pay state tax on their pension?

It depends on the state. Nine states have no income tax, and several more, including New York, Pennsylvania, and Illinois, exempt qualifying federal pension income while taxing other income, some with age or other conditions; the state table in this post lists the ones we track. Michigan effectively removed state tax on most federal pensions for 2026 with a $65,987 single and $131,794 joint retirement deduction. The rest, including California, tax a federal pension as ordinary income.

What is the mandatory withholding rate on TSP withdrawals?

TSP must withhold 20% federal tax on the taxable portion of any withdrawal or installment schedule expected to last fewer than 10 years, because the IRS treats those as eligible rollover distributions; required minimum distribution amounts are excluded from that category and escape the mandatory 20%. You can elect more than 20% but not less, and you cannot waive it. Installments over 10 or more years, or based on life expectancy, avoid the mandatory 20% and use W-4P-style withholding.

How much federal tax does a GS-13 retiree couple owe on a pension, supplement, TSP, and Social Security combined?

Under 2026 rules, a household with a $48,000 FERS pension, $14,000 supplement, $30,000 TSP withdrawal, and $18,000 of spousal Social Security owes about $7,310 with one spouse's senior deduction, or $8,030 without it. That is an effective federal rate of about 7%. One more $10,000 TSP withdrawal costs $1,200 because the couple is already at the 85% Social Security taxation ceiling.

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