Short answer
Traditional TSP is usually tax-deferred, while Roth TSP is after-tax money with different qualified withdrawal rules.
The TSP explains traditional and Roth contribution treatment, while IRS distribution rules govern how retirement withdrawals show up for tax purposes. The retirement plan needs both balances, not one combined TSP number.
Start here
What you actually came to find out
Plain answers first. Sources stay below for checking details.
What is traditional TSP?
Pre-tax contribution treatment that can create taxable withdrawals later.
What is Roth TSP?
After-tax contribution treatment with different qualified withdrawal rules.
Why split them in the plan?
A single TSP balance can hide future taxes if traditional and Roth dollars are mixed.
What else matters?
FERS pension, Social Security, state tax, RMDs, and Medicare premiums all shape the tax year.
Traditional
Tax later
The TSP explains traditional tax treatment.
Source trail: Thrift Savings Plan
Roth
After-tax
The TSP explains Roth contribution treatment.
Source trail: Thrift Savings Plan
Withdrawals
Tax year
IRS Publication 590-B explains retirement distribution context.
Source trail: IRS: Publication 590-B: Distributions from Individual Retirement Arrangements
RMDs
Timing
IRS RMD rules can affect retirement accounts later.
Source trail: IRS: Required Minimum Distributions FAQs
A neutral way to read Roth versus traditional TSP is this: one account label changes taxable income later, and the full plan decides which years need which kind of dollar.
Neutral landscape
The shape of the question
The TSP source explains traditional and Roth contributions as different tax treatments inside the plan.
Source trail: Thrift Savings Plan
The withdrawal source explains how TSP money can leave in retirement after separation.
Source trail: Thrift Savings Plan
The IRS source explains why traditional retirement distributions can become taxable income.
Source trail: IRS: Publication 590-B: Distributions from Individual Retirement Arrangements, IRS: Tax Inflation Adjustments
Curator core
What the authorities say
These sources are here for the reader who wants to check the work. The plain-English answer stays above them.
Source 01
Thrift Savings Plan
Traditional and Roth Contributions
The TSP explains traditional and Roth contribution treatment, matching contributions, and how taxes differ.
Source framing
The TSP frames traditional and Roth as different tax treatments inside the same plan.
Strongest for: official TSP traditional versus Roth account treatment
Read at Thrift Savings PlanSource 02
Thrift Savings Plan
Withdrawals in Retirement
The TSP explains withdrawal options for participants in retirement.
Source framing
The TSP explains that retirement withdrawals can be structured in different ways after separation.
Strongest for: retirement withdrawal options
Read at Thrift Savings PlanSource 03
IRS
Publication 590-B: Distributions from Individual Retirement Arrangements
Publication 590-B is the IRS source for IRA distributions, Roth ordering rules, and required minimum distributions.
Source framing
IRS Publication 590-B explains distribution rules that matter after money leaves an IRA.
Strongest for: RMDs, Roth distribution rules, and IRA withdrawals
Read at IRSSource 04
IRS
Required Minimum Distributions FAQs
The IRS RMD FAQ explains which accounts have required withdrawals and when the first withdrawal generally begins.
Source framing
IRS says required minimum distributions apply to many retirement accounts, with Roth IRAs treated differently during the original owner lifetime.
Strongest for: official RMD age and account rules
Read at IRSSource 05
OPM
FERS Information: Computation
OPM explains FERS annuity computation and related retirement benefit mechanics.
Source framing
OPM explains how FERS retirement benefits are calculated from service, age, and salary inputs.
Strongest for: FERS calculation vocabulary
Read at OPMSource 06
SSA.gov
Retirement Estimator
SSA explains how workers can estimate future benefits using their own earnings record.
Source framing
SSA points people to personal estimates because benefits depend on earnings history and claiming age.
Strongest for: personal Social Security estimates
Read at SSA.govPlain-English forks
The forks people face
Most retirement questions hide a few smaller decisions. These are the practical pieces that change the plan.
How much is traditional versus Roth?
Why it matters: The tax label of the balance matters as much as the total TSP number.
In real life: This fork changes taxable withdrawals later.
What to look at: What to look at: TSP balance details.
What income already fills the tax return?
Why it matters: FERS pension and Social Security can use bracket space before TSP withdrawals arrive.
In real life: This fork changes the tax stack.
What to look at: What to look at: federal pension and SSA estimates.
When do RMDs begin?
Why it matters: Forced withdrawals can change later-year taxable income.
In real life: This fork changes the future TSP draw.
What to look at: What to look at: IRS RMD rules.
Does Medicare income matter?
Why it matters: Taxable income can affect Medicare premium layers in later years.
In real life: This fork connects TSP withdrawals to health costs.
What to look at: What to look at: the plan Medicare section.
Common questions
Quick answers
Short, plain answers for the questions people usually have next. The source trail stays available below.
Is Roth TSP the same as traditional TSP?+
No. The TSP explains traditional and Roth as different tax treatments inside the plan.
Are traditional TSP withdrawals taxable?+
Traditional retirement distributions can be taxable under IRS distribution rules.
Does Roth TSP avoid all planning issues?+
No. Roth treatment is different, but withdrawal timing, income needs, account balances, and estate facts still matter.
Does TSP have RMDs?+
IRS RMD rules can apply to retirement accounts, with details depending on account type and law.
Where does this belong in a federal plan?+
It belongs next to FERS pension, Social Security, FEHB or Medicare, and tax projections.
Can TSP money be rolled over?+
IRS rollover guidance explains eligible retirement plan transfers.
How this page is curated
This page uses TSP traditional and Roth guidance, TSP retirement withdrawals, IRS distribution and RMD sources, OPM FERS computation, and SSA benefit-estimate sources.
Read the planner methodologyTrust anchor
Sources used on this page
Every source named above is listed here in one place.
IRS. Publication 590-B: Distributions from Individual Retirement Arrangements
https://www.irs.gov/publications/p590bIRS. Required Minimum Distributions FAQs
https://www.irs.gov/retirement-plans/retirement-plan-and-ira-required-minimum-distributions-faqsOPM. FERS Information: Computation
https://www.opm.gov/retirement-center/fers-information/computation/SSA.gov. Retirement Estimator
https://www.ssa.gov/benefits/retirement/estimator.htmlThrift Savings Plan. Traditional and Roth Contributions
https://www.tsp.gov/making-contributions/traditional-and-roth-contributions/Thrift Savings Plan. Withdrawals in Retirement
https://www.tsp.gov/withdrawals-in-retirement/
Before you act on this
This plan is educational. It is not personalized financial, tax, or insurance advice. Projections illustrate the math, they do not predict the future. Talk to your own licensed financial professional before acting on any of it.