Retirement sounds simple until taxes show up. That’s why federal retirement taxes trip up so many people. You may know roughly what your FERS pension, TSP, or military retirement will pay. But what matters is what lands in your bank account after federal tax, state tax, Medicare premiums, and withholding. A lot of retirees find out too late that a “good” income on paper can feel much smaller in real life.
Here’s the good news: this is very plan-able. If you understand how each piece is taxed, you can avoid bad surprises and keep more of your money. And if you want the fastest way to see your own numbers, try the free calculator at Is My Job Worth It. It helps you compare income and benefits in a way that’s much easier than building your own spreadsheet.
The basics of federal retirement taxes
Let’s start with the big picture.
Most federal and military retirees do not have just one income source. They often have some mix of:
- A FERS pension or military retired pay
- TSP withdrawals
- Social Security
- A spouse’s income
- Part-time work
- Traditional IRA or Roth IRA withdrawals
- VA disability compensation in some military cases
Each source can be taxed in a different way.
Is a FERS pension taxable?
Yes, in most cases, a FERS pension taxable amount is mostly subject to federal income tax. But not every dollar is taxed.
Why? Because while you worked, you paid part of your salary into FERS with after-tax money. That means a small part of each monthly pension check is treated as a return of your own contributions. That part is not taxed again. The rest is taxable.
You can review the pension formula on OPM’s FERS computation page.
For a refresher on how the pension itself is built, see our guide to FERS retirement benefits.
How TSP withdrawals are taxed
TSP withdrawal taxes depend on the type of money in your account:
- Traditional TSP: taxed as ordinary income when withdrawn
- Roth TSP: qualified withdrawals are tax-free
- Early withdrawals may face a 10% IRS penalty in some cases
The IRS explains retirement distribution rules here: IRS retirement topics: tax on distributions. You can also review TSP rules at TSP.gov.
Social Security taxation basics
Social Security is not always tax-free. Depending on your “combined income,” up to 85% of your Social Security benefits may be taxable at the federal level.
That does not mean an 85% tax rate. It means up to 85% of the benefit gets added to taxable income.
For official rules, use SSA.gov and IRS.gov.
FERS pension taxable rules: what federal retirees need to know
If you’re under FERS, your pension is usually one of the easiest pieces to understand, but there are still a few traps.
How the taxable part works
Most retirees get a monthly pension from OPM. Each payment has:
- A small tax-free part
- A larger taxable part
The tax-free part comes from your already-taxed employee contributions. The IRS spreads that amount over your expected lifetime using a rule called the “Simplified Method.”
Here’s a simple example.
Say you retire with:
- Total FERS contributions: $32,000
- Expected monthly payments under IRS tables: 310 months
Your monthly tax-free amount would be about:
If your monthly pension is $2,800, then:
- $103.23 is not taxed
- $2,696.77 is taxable for federal income tax purposes
That’s why the answer to “Is a FERS pension taxable?” is “mostly yes, but not fully.”
What about survivor benefits?
If you elect a survivor benefit for your spouse, your monthly pension is reduced. That lower payment may also lower your taxable income.
For example:
- Unreduced pension: $3,200 a month
- With survivor election: $2,900 a month
That $300 difference may help your spouse later, but it also changes your current tax picture.
State taxes matter too
Federal tax is only part of the story. Some states fully tax federal pensions. Some partly tax them. Some do not tax them at all.
If you are thinking about moving, our best states for federal retirees and best no-tax states for military and federal retirees guides can help.
Don’t forget the Special Retirement Supplement
Some FERS retirees can get the Special Retirement Supplement before age 62. That payment is meant to act like a bridge to Social Security. It is generally taxable for federal income tax purposes.
Learn more in our Federal Employee Special Retirement Supplement guide.
TSP withdrawal taxes: how timing changes your tax bill
This is where retirement income tax planning federal employees often miss big chances.
Traditional TSP vs Roth TSP
Traditional TSP lowers your taxable income while working. But later, every taxable withdrawal counts as ordinary income.
Roth TSP does the opposite:
- You pay tax now
- Qualified withdrawals in retirement are tax-free
That means the same $40,000 withdrawal can have very different tax results.
Example:
- Traditional TSP withdrawal: $40,000 added to taxable income
- Roth TSP withdrawal: $0 added to taxable income if qualified
That can affect:
- Your tax bracket
- Tax on Social Security
- Medicare IRMAA surcharges
- State taxes
For more on withdrawal choices, read our TSP withdrawal strategies for federal retirees and TSP rollover guide.
Early withdrawal penalties
Many retirees leave service before age 59½ and worry about the 10% penalty. The good news is that some federal retirees can avoid it.
In general:
- If you separate during or after the year you turn 55, TSP withdrawals may avoid the 10% early withdrawal penalty
- For certain public safety employees, that age can be lower
- If you roll TSP to an IRA first, you may lose that age-55 exception
That last point is a common and expensive mistake.
Required minimum distributions
At a certain age under IRS rules, you must start taking required minimum distributions, or RMDs, from traditional TSP unless an exception applies. These forced withdrawals can push you into a higher tax bracket.
That’s why some retirees do Roth conversions, partial withdrawals, or other planning before RMD age. Our Required Minimum Distributions: TSP vs IRA rollover strategies article covers that in more detail.
And again, if you want to test your own pension and TSP mix, Is My Job Worth It is a practical shortcut. It helps you see how different income sources change your take-home picture.
Social Security, military retired pay, and retirement income tax planning federal workers should not ignore
Federal retirees often focus on OPM and TSP, but Social Security and military retired pay can change the full tax picture.
How Social Security becomes taxable
The IRS uses “combined income”:
- Adjusted gross income
- Plus nontaxable interest
- Plus half of Social Security benefits
For many married couples, once combined income rises above certain levels, up to 85% of benefits can become taxable.
Simple example:
- Pension income: $30,000
- Traditional TSP withdrawals: $25,000
- Social Security: $24,000
- Half of Social Security: $12,000
Combined income = $67,000
At that level, a large part of Social Security will likely be taxable.
For more, see our Social Security and FERS guide.
Military retirement pay
Military retired pay is generally taxable as ordinary income for federal tax purposes. DFAS handles payments and tax withholding. See DFAS for official details.
But there are key exceptions:
- VA disability compensation is usually tax-free
- Some disability-related military retirement rules are different
- CRDP and CRSC have different tax treatment
If that applies to you, our CRDP explained guide and CRSC calculator article are worth reading.
Medicare IRMAA surprises
This is a tax-like hit many retirees miss. IRMAA stands for Income-Related Monthly Adjustment Amount. If your income is high enough, you pay more for Medicare Part B and Part D.
A big TSP withdrawal in one year can raise your Medicare premiums later. That’s why retirement income tax planning federal retirees need to look beyond just April 15.
Learn more in our IRMAA guide and the official CMS Medicare site.
Practical examples with real numbers
Let’s make this real.
Example 1: FERS retiree with pension and TSP
Maria retires at 62 with:
- FERS pension: $36,000 a year
- Tax-free pension recovery: $1,200 a year
- Traditional TSP withdrawal: $20,000
- Social Security: not started yet
Her federal taxable income from retirement sources is roughly:
- Taxable pension: $36,000 - $1,200 = $34,800
- Traditional TSP: $20,000
- Total taxable retirement income = $54,800
If Maria instead took $10,000 from Roth TSP and $10,000 from Traditional TSP:
- Taxable pension: $34,800
- Taxable TSP: $10,000
- Roth TSP qualified withdrawal: $0 taxable
- New total taxable retirement income = $44,800
That one choice cuts taxable income by $10,000.
Example 2: Married federal couple with Social Security
James and Tonya are married filing jointly:
- James FERS pension: $42,000
- Tonya Social Security: $18,000
- James Social Security: $24,000
- Traditional TSP withdrawal: $30,000
Combined income test:
- Pension: $42,000
- TSP: $30,000
- Half of total Social Security ($42,000 ÷ 2): $21,000
- Combined income = $93,000
At that level, up to 85% of their Social Security benefits may be taxable.
Potential taxable Social Security amount:
Estimated taxable income before deductions:
- Pension: $42,000
- TSP: $30,000
- Taxable Social Security: up to $35,700
- Total = $107,700
That is why TSP withdrawal size matters so much.
Example 3: Military retiree with VA disability
Rob is a retired E-7 with:
- Military retired pay: $32,400 a year
- VA disability compensation: $12,000 a year
- Part-time civilian work: $18,000
- Roth TSP from later federal service: $8,000 qualified withdrawal
Tax treatment:
- Military retired pay: taxable
- VA disability: not taxable
- Civilian work: taxable
- Roth TSP qualified withdrawal: not taxable
Taxable income from these sources:
- $32,400 + $18,000 = $50,400
Even though Rob receives total cash of $70,400, only $50,400 is taxable from those listed sources.
Example 4: The “big withdrawal” problem
Angela has:
- FERS pension: $28,000
- Social Security: $22,000
- Traditional TSP balance: $450,000
She wants to withdraw $80,000 in one year to pay off her mortgage.
That may:
- Push more of Social Security into taxable income
- Raise her tax bracket
- Increase Medicare IRMAA later
A better option might be:
- Take smaller withdrawals over 2-3 years
- Use Roth funds first if available
- Compare results before acting
This is exactly the kind of case where Is My Job Worth It can save you time. It’s easier to test a few “what if” cases before you make a permanent move.
Common mistakes people make with federal retirement taxes
Here are some of the biggest errors.
Mistake 1: Thinking withholding equals actual tax
Your pension or TSP withholding is just a prepayment. It is not your final tax bill. You can still owe more.
Mistake 2: Forgetting state taxes
A move from Virginia to Florida can change your net income. So can a move in the other direction. State rules matter.
Mistake 3: Pulling too much from Traditional TSP at once
Large withdrawals can trigger more tax on Social Security and higher Medicare premiums.
Mistake 4: Rolling TSP to an IRA too fast
That may remove the age-55 penalty exception for some retirees.
Mistake 5: Ignoring official sources
Always verify details with OPM.gov, TSP.gov, IRS.gov, SSA.gov, and DFAS.
For news and practical updates, many readers also follow FedWeek, GovExec, Federal Times, and Military.com.
A step-by-step plan for retirement income tax planning federal employees can use
You do not need to guess. Use this checklist.
Step 1: List every retirement income source
Write down expected yearly amounts for:
- FERS pension or military retired pay
- TSP withdrawals
- Social Security
- VA disability
- Part-time work
- IRA income
- Spouse income
Step 2: Mark each one as taxable, partly taxable, or tax-free
For example:
- FERS pension: mostly taxable
- Traditional TSP: taxable
- Roth TSP qualified withdrawals: tax-free
- Social Security: maybe partly taxable
- VA disability: usually tax-free
Step 3: Estimate your taxable income
Add up the taxable pieces. Then estimate whether Social Security becomes partly taxable too.
You can use IRS worksheets, a tax pro, or a calculator. For a quick first pass, Is My Job Worth It is one of the easiest tools to use because it helps you compare real take-home outcomes, not just gross numbers.
Step 4: Check for tax spikes
Ask:
- Will a large TSP withdrawal push me into a higher bracket?
- Will it increase Social Security taxation?
- Could it trigger IRMAA later?
- Would spreading withdrawals over several years help?
Step 5: Review your location and timing
State tax rules can change your result a lot. So can the year you start Social Security or begin TSP withdrawals.
Our state residency rules for military and federal retirees and benefits guide can help you think through the bigger picture.
Step 6: Verify with official sources
Before making a final move, check:
Bottom line on federal retirement taxes
Here’s the simple version. Your pension, TSP, and Social Security do not all get taxed the same way. A FERS pension taxable amount is usually mostly taxable, but not 100%. TSP withdrawal taxes depend on whether the money is Traditional or Roth. Social Security may be partly taxable, and large withdrawals can also affect Medicare premiums.
That’s why retirement income tax planning federal workers do before retirement can be worth real money. Even small choices, like taking $10,000 from Roth instead of Traditional TSP, can change your tax bill.
If you want a faster way to see your personal results, try the free calculator at Is My Job Worth It. Then confirm the details with OPM, TSP, IRS, and SSA. A little planning now can help you keep more of what you earned.