Is A TSP a 401k or 403(b) Comparison Chart (Which is Better)
POINTS
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A TSP is not a 401(k), but both offer similar tax-advantaged retirement benefits.
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TSPs are available to federal employees and military members, while 401(k)s are offered by private-sector employers.
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Both plans support Traditional and Roth contributions with valuable tax benefits.
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TSPs are known for their exceptionally low investment fees.
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You can usually roll over funds between a TSP and a 401(k) without paying taxes.
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The better plan depends on your employer, investment options, fees, and retirement goals.
Thrift Savings Plan (TSP) is often compared with a 401(k) because both serve as employer-sponsored retirement accounts built around similar tax advantages and investment structures.
The comparison is common enough that the two are sometimes treated as interchangeable in general discussion, even though they operate under different systems and rules.
Overlap is significant, but the plans differ in key areas such as
- Contribution structures
- Withdrawal rules
- Investment options, and
- Plan administration.
Similarities
- Both are defined contribution retirement plans.
- Payroll deduction contributions.
- Traditional (pre-tax) and Roth (after-tax) options.
- Tax-advantaged investment growth.
- Same IRS contribution limits.
- 10% early withdrawal penalty before age 59½ (with exceptions).
- May allow participant loans.
Differences
- TSP is for federal employees and military; 401(k)s are for private-sector employees.
- TSP has fewer, low-cost index funds; 401(k)s typically offer more investment choices.
- TSP has low fees and standardized matching; 401(k) fees and matching vary by employer.
- Only TSP offers the G Fund, with principal protection.
Where they differ most sharply is on
- Fees
- Investment options
- Federal matching formula.
TSP is exclusively for federal civilian and uniformed services participants, while 401(k) plans are only offered by private-sector employers to their employees.
What Is a Thrift Savings Plan (TSP)?
The Thrift Savings Plan (TSP) is a retirement savings and investment plan for U.S. federal employees and uniformed service members.
All eligible federal civilian employees and military personnel under the BRS or earlier retirement systems can participate.
A TSP account works much like a 401(k):
- The employee chooses how much to defer
- Can choose between traditional (pre-tax) or Roth (after-tax) contributions.
- Contributions are invested among TSP’s fund options.
- Earnings compound tax-deferred.
Upon retirement or separation, the participant can leave funds invested, withdraw lump sums or installments, or convert to an annuity.
How a TSP Works
A TSP operates through a combination of what you put in, what the government adds on top, and how that combined pool gets invested.
1: Employee Contributions
While employed in a TSP-eligible position, participants can defer up to the IRS elective limit from their basic pay each year.
The choice of traditional (pre-tax) or Roth (after-tax) is yours to make and can be split between the two if you prefer.
2: Automatic Contributions
For FERS and BRS participants specifically, the government deposits 1% of your basic pay automatically into your TSP account, whether you contribute anything yourself or not.
This isn’t a match.
It’s a floor benefit. CSRS employees don’t receive this.
This automatic 1% vests after three years of service for most FERS employees and after two years for BRS members.
If you leave federal service before those thresholds, the unvested auto contributions revert to the government. After you’ve crossed the vesting mark, they’re yours permanently.
3: Matching Contributions
On top of the automatic 1%, FERS and eligible BRS participants receive matching contributions on their own deferrals.
For BRS military members specifically, matching contributions don’t begin until after two years of service.
4. Vesting
Your own contributions are always 100% yours immediately.
Matching contributions from the agency are also immediately vested; you own them the moment they’re deposited, unlike many private-sector plans where you have to stay employed for three to six years to own the employer match.
Only the automatic 1% has a vesting delay:
- 3-4 years for FERS
- 2 years for BRS
5. Investment of Funds
Participants choose their own fund allocations through the TSP’s online account system.
The core lineup consists of five index funds:
| Fund | What it invests in | Risk level |
|---|---|---|
| G Fund | Special U.S. government securities | Very low |
| F Fund | U.S. investment-grade bonds | Low–moderate |
| C Fund | Large and mid-cap U.S. stocks | High |
| S Fund | Small and mid-cap U.S. stocks (outside S&P 500) | High |
| I Fund | International developed market stocks | High |
| L Funds | Mix of G, F, C, S, and I funds with automatic rebalancing toward safer assets over time | Varies (high → low over time) |
For participants who want more investment options, an optional Mutual Fund Window opens up access to thousands of outside funds, but it requires a minimum of $10,000 in TSP assets and caps the window allocation at 25% of your total balance.
6. Withdrawals
While still employed, participants can take an in-service withdrawal once they reach 59½ from their vested balance, without penalty.
Hardship withdrawals are available under strict criteria but are rarely used compared to private-sector 401(k) hardship provisions.
- Negative monthly cash flow
- Medical expenses
- Personal casualty loss
- Legal expenses
- FEMA-declared disaster expenses
TSP vs. 401(k): Side-by-Side Comparison
The table below compares TSP and 401(k) plans across major features:
| Feature | TSP (Federal) | 401(k) (Private) |
|---|---|---|
| Type | Government 401(k)-like plan | Employer-sponsored retirement plan |
| Who can join | Federal employees & military | Private-sector employees (varies by employer) |
| Employer match | ~1% automatic + up to 4% match (FERS/BRS) | Varies (0–6% typical, or none) |
| Vesting | Your money: immediate; match: 2–3 years | Your money: immediate; employer: 3–6 years |
| Investments | Few low-cost index funds (G, C, S, I, F) | Many mutual funds; investment choices vary widely |
| Fees | Very low (~0.04–0.05%) | Higher (~0.1%–1%+) |
| Loans | Allowed (limited, strict rules) | Often allowed (depends on the plan) |
| Withdrawals | Limited hardship access; strict rules | More flexible hardship options |
| Roth option | Yes (Roth TSP) | Yes (Roth 401(k) in most plans) |
| Taxes | Traditional = taxed later; Roth = tax-free growth | Same tax structure |
| RMDs | Required around age 73 (unless still working) | Same IRS rule |
| Portability | Can roll into an IRA or another 401(k) | Can roll into an IRA or TSP |
Key age milestones that apply to both plans:
| Age | Rule (Applies to TSP & 401(k)) |
|---|---|
| 50+ | Eligible for IRS catch-up contributions. |
| 55* | If you separate from service at 55 or older, you can take penalty-free withdrawals from your current employer’s plan (Rule of 55). |
| 59½ | 10% early withdrawal penalty no longer applies to eligible distributions. |
| 60–63 | Higher IRS catch-up limit applies (e.g., $11,250 for 2026, if the plan permits). |
| 73 | Required Minimum Distributions (RMDs) generally begin for those subject to the age-73 rule. |
| 75 | RMD age is 75 for individuals born in 1960 or later. |
Can You Have Both a TSP and a 401(k)?
Yes, a person can participate in a TSP while also contributing to a private 401(k), provided they are eligible for both.
But the IRS elective-deferral limit is per individual, not per account.
This means that if you have both plans in the same year, your total contributions across all 401(k)-type accounts (TSP, 401(k), 403(b), 457(b), etc. cannot exceed the limit.
Can You Roll a TSP Into a 401(k) (or Vice Versa)?
Yes, the TSP is a qualified plan under IRS rules, so it can receive rollovers from other qualified retirement accounts and can be rolled out to such accounts.
401(k) to TSP
Federal employees may roll funds from a traditional 401(k) or IRA into their traditional (pre-tax) TSP account, or from a Roth 401(k)/Roth IRA into Roth TSP.
Such incoming rollovers do not count against the TSP contribution limit. This can be an attractive option since TSP offers lower fees than many private accounts.
Important Note
If you’re joining federal service and have a 401(k) from a previous private-sector employer, you can roll that balance directly into your Traditional TSP or Roth TSP.
Incoming rollovers do not count toward your annual TSP contribution limit.
Once the money is in the TSP, it benefits from the plan’s exceptionally low fees, often around 0.04% compared with roughly 0.5% to 1.5% in many private-sector retirement plans.
TSP to 401(k)/IRA
Similarly, when a federal employee leaves for a private-sector job, they may roll TSP savings into an employer’s 401(k) or into an IRA.
Traditional TSP rolled to a traditional 401(k)/IRA is tax-free, and Roth-to-Roth likewise.
No taxes or penalties apply so long as it’s done as a trustee-to-trustee transfer or within 60 days of distribution.
Roth conversions
TSP allows in-plan Roth conversions, but that’s separate from rollovers.
That means an existing traditional TSP balance can be converted to Roth within the TSP.
Traditional TSP ←→ Traditional 401(k) or Traditional IRA (tax-free in either direction)
Roth TSP ←→ Roth 401(k) or Roth IRA (tax-free in either direction)
Which Is Better: TSP or 401(k)?
| Plan | Pros | Cons |
|---|---|---|
| TSP |
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| 401(k) |
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Neither plan is inherently better in every case; it depends on your situation.
For a federal employee deciding between contributing to a TSP and another plan, the TSP is typically more cost-effective with strong matching.
For a private employee, the best strategy is to take full advantage of any employer match in their 401(k) before saving in an IRA.
TSP Vs 401(k) FAQs
No. The TSP is a federal retirement plan, but it works much like a 401(k), with similar tax benefits, contribution limits, and withdrawal rules.
No. The TSP is available only to federal civilian employees and members of the uniformed services.
Your account stays yours. You can leave it in the TSP, roll it into another retirement account, or take withdrawals subject to IRS rules.
Yes, but both plans share the same annual IRS employee contribution limit.
In many cases, yes. The TSP offers one of the most generous matching programs available, especially for employees under FERS.
Yes, if your account and plan rules qualify. Like a 401(k) loan, the money must be repaid or it may become a taxable distribution.
They work almost identically, allowing after-tax contributions with tax-free qualified withdrawals. Both follow similar IRS rules.
Yes. After leaving federal service, you can roll your Traditional TSP into a Traditional IRA and your Roth TSP into a Roth IRA without immediate taxes.
Yes. Eligible participants age 50 and older can make catch-up contributions, subject to annual IRS limits.
If you’re eligible for the TSP, it’s usually worth contributing enough to receive the full government match. You can also save in other retirement accounts if you stay within IRS contribution limits.
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