If you're a federal employee heading into the private sector, one of the biggest financial questions you'll face is what to do with your Thrift Savings Plan (TSP) account. A popular option is to roll it into your new employer's 401(k), but this is a decision that requires careful thought. You're essentially choosing between the TSP's well-known simplicity and rock-bottom fees and the broader investment choices and consolidation a new 401(k) might offer.

This choice isn't trivial—it will shape how you manage your retirement funds and could impact their growth for years to come.

Is a TSP to 401k Rollover Right for You?

Once you've left federal service, you have a few options for your TSP money. You can leave it right where it is, move it to an IRA, or roll it into your new company's 401(k). For many people, consolidating everything into a new 401(k) is appealing simply because it's easier to manage one account instead of two.

But this is more than just a matter of convenience; it’s a strategic financial move. The TSP is a titan in the retirement world. As of September 30, 2025, it held an incredible $1.1 trillion in assets, a huge slice of the $13.9 trillion held in all U.S. employer retirement plans. These retirement statistics show just how many people are in your shoes, weighing the pros and cons of moving away from the TSP system that dominates federal retirement.

Weighing the Key Factors

Before you pull the trigger on a rollover, you need to do a real side-by-side comparison. The right answer for you comes down to your personal financial situation, how hands-on you want to be with your investments, and, frankly, how good your new 401(k) plan actually is.

Here are the main things I tell people to think about:

• Investment Choices: The TSP is famously simple, offering a handful of core funds (G, F, C, S, I) and target-date Lifecycle (L) funds. On the other hand, a good 401(k) can open the door to hundreds of mutual funds, ETFs, and sometimes even individual stocks, giving you much more control to build a specific portfolio.
• The Cost of Investing (Fees): This is where the TSP shines. It has some of the lowest expense ratios you'll find anywhere. You have to investigate your new 401(k)'s fees very carefully, as many plans have higher administrative and fund-level costs that can silently eat away at your returns over the long haul.
• Access to Loans: This is a key difference. Once you separate from federal service, you can no longer take a loan from your TSP account. Many 401(k) plans, however, allow active employees to borrow from their vested balance, which can be a valuable feature if you ever need it.
• The Simplicity of Consolidation: Let's be honest—managing one retirement account is a lot easier than juggling several. Rolling your TSP over brings everything under one roof, giving you a single, clear picture of your retirement savings.

A common mistake I see is people getting dazzled by a 401(k)'s long list of investment options and completely overlooking the fee schedule. A 0.5% difference in annual fees might not sound like much, but on a $250,000 balance, that’s $1,250 a year you're losing—money that's not growing for your future.

To help you visualize these trade-offs, here’s a quick rundown of what you’re weighing.

Quick Comparison: TSP vs. 401(k) Rollover Considerations

This table breaks down the main differences to help you see which plan aligns better with your priorities.

Feature	Thrift Savings Plan (TSP)	Typical 401(k) Plan
Fees & Expenses	Extremely low, often one of the biggest advantages.	Varies widely; can be significantly higher than the TSP.
Investment Options	Limited, straightforward menu of index-style funds.	Often a much broader selection of mutual funds, ETFs, etc.
Loan Availability	Not available after you've separated from federal service.	Often available for active employees (plan-dependent).
Account Management	Simple, "set-it-and-forget-it" approach.	Requires more active management due to more choices.
Consolidation	Stays as a separate account from your new employer's plan.	Allows you to combine old retirement funds into one account.

Ultimately, you have to decide what matters more to you. Are you willing to pay potentially higher fees in exchange for more investment control and the convenience of one account? Or does the TSP's unbeatable low-cost, hands-off structure feel like the smarter long-term play? There’s no single right answer, only the one that’s right for your financial journey.

Why Would You Roll Your TSP into a 401(k)?

The Thrift Savings Plan is famous for its rock-bottom costs and beautiful simplicity. So why mess with a good thing? As it turns out, a thrift savings plan rollover to 401k can be a savvy strategic move, especially when your career path takes you out of federal service.

The decision really hinges on your new financial reality, your investment style, and what your new employer’s 401(k) brings to the table.

For most people, the biggest motivator is simple consolidation. You’ve spent years building your TSP balance, and now you have a brand-new 401(k) at your private-sector job. Juggling two different retirement accounts is just a hassle. It's tough to get a single, clear picture of your overall asset allocation when you're logging into two separate dashboards.

Bringing your TSP funds into your new 401(k) cleans things up immediately. You get one statement, one login, and a unified view of your entire retirement portfolio. This makes big-picture planning and rebalancing so much easier.

Go Beyond the Basics with a Wider Investment Universe

The TSP’s lineup—the C, S, I, F, and G funds—is a double-edged sword. Its simplicity is great for avoiding "analysis paralysis," but it can feel pretty confining if you want more hands-on control. Most modern 401(k) plans open the door to a much broader menu of investment choices.

This expanded access is a game-changer if you're looking to:

• Pinpoint Specific Sectors: Want to put more weight into technology, healthcare, or green energy? Many 401(k)s have specific funds for that, which the TSP just doesn’t offer.
• Invest with Your Values: Environmental, Social, and Governance (ESG) funds are becoming standard in 401(k)s, letting you align your retirement savings with what matters to you.
• Explore Different Asset Classes: Some plans offer things like real estate investment trusts (REITs) or international small-cap funds that can diversify your portfolio far beyond the TSP's core five.

A rollover gives you the power to build a portfolio that truly matches your risk tolerance and market outlook, freeing you from the TSP's one-size-fits-most approach.

For many people I work with, the "aha!" moment comes when they realize their new 401(k) has a fund that perfectly matches their investment thesis. It could be a specific emerging markets fund or an aggressive growth fund they couldn't access before. That level of control is often worth the effort of a rollover.

Get More Flexible Access to Your Money

Another huge factor comes into play as you get closer to retirement: how you actually get your money out. While the TSP has gotten better with its withdrawal options, many 401(k) plans are simply more sophisticated. They might offer more nuanced systematic withdrawal schedules or permit penalty-free distributions in certain situations.

Even more importantly, once you leave federal service, you can no longer take a loan from your TSP. Your new 401(k), however, likely allows you to borrow against your vested balance. Having that loan option in your back pocket can be a lifesaver for unexpected emergencies, preventing you from having to sell off investments at the wrong time.

It's also worth noting how contribution limits work here. For 2026, the elective deferral limit is projected to be $24,500, with an $8,000 catch-up for those 50 and over. These caps apply across all your plans (TSP and 401k combined). But the rollover itself doesn't count against these limits—a critical detail for the 2.1 million federal employees and service members planning their futures. You can dive into the specifics by checking out the new retirement rates and key numbers for 2026.

Ultimately, a thrift savings plan rollover to 401k is about more than just moving your money. It's about gaining access to a new set of tools and features that might be a better fit for where you are in life now. By carefully comparing your new 401(k)'s investment menu, fees, and rules, you can make a powerful choice that puts you in the driver's seat.

The Powerful Case for Keeping Your Money in the TSP

While consolidating accounts into a new 401(k) can feel like a neat and tidy move, it’s not always the smartest one. Before you initiate a thrift savings plan rollover to 401k, you need to understand what you might be giving up.

Frankly, leaving your money right where it is can be an incredibly powerful financial strategy. For many federal employees, the TSP’s built-in advantages are simply too good to walk away from.

The Unbeatable Advantage of Low Fees

Let's cut to the chase: fees are the silent killer of investment returns. This is where the TSP absolutely trounces nearly every 401(k) plan out there.

The expense ratios inside the TSP are astonishingly low—we're talking about hundredths of a percent. Your new company's 401(k) might have fees that seem small, maybe 0.50% or even 1.0%. But that seemingly tiny difference compounds into a staggering amount of lost money over the decades.

Let me put this into real-world numbers. Imagine you have a $200,000 balance.

• TSP Annual Fee: With a typical expense ratio around 0.04%, your annual cost is a mere $80.
• Typical 401(k) Annual Fee: A fairly standard 0.75% all-in fee would cost you $1,500 per year.

That’s a difference of over $1,400 in a single year. That’s cash that’s no longer in your account, no longer growing, and no longer compounding for your retirement. Over 20 years, that "small" fee difference could easily rob you of tens of thousands of dollars in growth.

The single greatest factor in long-term investment success is minimizing costs. The TSP accomplishes this better than almost any other retirement plan available, making it a formidable foundation for your financial future.

This cost advantage alone is why so many experienced investors keep their TSP account active long after leaving federal service. To make the most of this structure, you can learn more about top TSP investment strategies for federal employees in our guide.

The Unique Stability of the G Fund

Beyond the rock-bottom fees, the TSP offers something you simply cannot replicate in the private sector: the Government Securities Investment (G) Fund.

What makes the G Fund so special? It invests in nonmarketable U.S. Treasury securities issued exclusively to the TSP. It provides a guaranteed rate of return and, most importantly, your principal is protected from loss by the full faith and credit of the U.S. government.

You won't find a direct equivalent in a 401(k). Sure, you'll see money market or stable value funds, but none come with that same ironclad government guarantee against losing your principal while still earning a respectable return. For anyone nearing retirement or who simply can't stomach market volatility, the G Fund is an invaluable tool for preserving capital.

The Overlooked Benefit of Simplicity

In a world filled with endless and often confusing investment choices, the TSP's simple five-fund lineup (plus the target-date L Funds) is a feature, not a bug. It’s a powerful defense against "analysis paralysis"—the state of being so overwhelmed by options that you end up making poor decisions, or worse, no decision at all.

This streamlined menu encourages a disciplined, long-term approach. It helps you build a solid, diversified portfolio and stick with it, rather than chasing the latest hot trend or getting tangled in complex products often peddled in 401(k) plans. For anyone who values a straightforward "set-it-and-forget-it" path to retirement, the TSP’s elegant simplicity is a huge, often underrated, benefit.

How To Navigate The TSP Rollover Process

Moving your Thrift Savings Plan funds into a 401(k) can feel like a major undertaking, but it’s a well-worn path if you know the steps. Let's walk through exactly how to get it done right, making sure your hard-earned retirement money lands safely where it's supposed to.

First things first, you can only initiate a rollover once you've separated from federal service. Assuming that's you, the next call you need to make is to your new 401(k) provider. Confirm they accept rollovers from the TSP—most do, but you never want to assume. Once you get the green light, your key document is Form TSP-70, Request for a Full Withdrawal.

Think of this form as your official transfer order. Every detail on it has to be perfect. One wrong digit in an account number or a misspelled name can send the whole process grinding to a halt, adding weeks of frustrating delays. Take your time and get it right the first time.

The Critical Choice: Direct vs. Indirect Rollover

This is where you need to pay close attention. On Form TSP-70, you'll be asked to choose between a direct and an indirect rollover, and this decision has huge tax consequences. It’s arguably the most important box you'll check.

A direct rollover is the clean, simple, and overwhelmingly recommended route. The TSP sends the money straight to your new 401(k) administrator. You never touch it. The check is made out to the new institution, not to you, so the money stays in its tax-deferred cocoon, and no taxes are withheld. It’s the safest play by far.

Then there's the indirect rollover, which is full of pitfalls. Here, the TSP cuts you a check directly, but not before withholding a mandatory 20% for federal taxes. You then have a strict 60-day window to get the full original amount into your new 401(k). Miss that deadline, and the entire withdrawal is considered taxable income, potentially hit with an extra 10% early withdrawal penalty.

A Cautionary Tale: The 60-Day Trap

Let's look at a real-world example. Imagine Sarah leaves federal service with $100,000 in her TSP and opts for an indirect rollover. The TSP mails her a check for $80,000, holding back $20,000 for the IRS. To complete the rollover correctly and avoid taxes, Sarah has to deposit the full $100,000 into her new 401(k) within 60 days. That means she has to come up with $20,000 from her own savings to make the deposit whole. If she only deposits the $80,000 she received, that missing $20,000 is treated as a taxable distribution.

It’s a high-stakes game that rarely makes sense to play.

Of course, a rollover isn't the right move for everyone. This flowchart breaks down the simple, powerful reasons many federal employees keep their money right where it is.

The TSP's rock-bottom fees, the exclusive G Fund, and its no-fuss nature are hard to beat. For a lot of people, these core benefits outweigh the flexibility a 401(k) might offer.

Your Actionable Checklist For Your TSP To 401k Rollover

To keep things organized and prevent any missteps, a checklist is your best friend. This table breaks down the entire process from start to finish, so you can track your progress and know exactly what to do next.

Phase	Action Item	Key Tip
1. Preparation	Confirm your new 401(k) plan accepts rollovers and request their specific rollover instructions.	Get the exact legal name of the financial institution and the correct mailing address for rollover checks. Precision is everything.
2. Documentation	Download and carefully complete Form TSP-70, Request for a Full Withdrawal.	Always select the direct rollover option. Double-check the 401(k) plan number and the institution’s name you wrote down.
3. Submission	Submit the completed and signed Form TSP-70 to the TSP.	Make a digital or physical copy of the completed form for your personal records before you send it off.
4. Tracking	Follow up with the TSP to confirm they’ve processed your request.	Give it about 1-2 weeks, then check the status of your request on the official TSP website or by calling.
5. Confirmation	Contact your new 401(k) administrator to confirm they've received the rollover check.	Don't wait for them to call you. The check is sent via standard mail, so be proactive. Ask about their processing timeline.
6. Verification	Log into your new 401(k) account and verify the funds have been correctly deposited and invested.	Make sure the full amount has landed and is invested according to your selections, not just sitting in a default money market fund.

Following these steps methodically will ensure a smooth transition for your retirement funds.

Taking Charge By Asking The Right Questions

Don't ever hesitate to pick up the phone. Clear communication with both the TSP and your new 401(k) administrator is the best way to prevent confusion and keep the process on track. And remember, a 401(k) isn't your only option; if you're exploring alternatives, our guide on how to roll over your TSP to an IRA is another great resource.

Here are a few scripts you can use to get the ball rolling:

Questions for the TSP (ThriftLine Service Center):

• "I submitted my Form TSP-70 on [Date]. Can you confirm it was received and is in good order?"
• "What's the estimated date my rollover check will be mailed to my new 401(k) provider?"
• "Could you confirm the exact amount that is being processed for my rollover?"

Questions for Your New 401(k) Administrator:

• "I'm initiating a direct rollover from the federal TSP. Can you confirm the exact payee information and mailing address I need to put on my withdrawal form?"
• "After you receive the check from the TSP, how long does it typically take for the funds to post and be invested in my account?"
• "How are incoming rollover funds initially invested? Do they go directly into my chosen funds, or do they sit in a settlement fund first?"

When you take control of the conversation, you shift from being a passenger to the driver of your retirement journey. This proactive stance is the key to ensuring your thrift savings plan rollover to 401k is a complete success.

Understanding Rollover Tax Rules and Roth Conversions

When you're executing a thrift savings plan rollover to 401k, it’s about more than just filling out forms. You've got to get a sharp handle on the tax implications.

Getting this wrong can lead to a nasty, unexpected tax bill. But if you play it smart, you can set yourself up for much greater tax efficiency down the road in retirement.

The most straightforward move is a "like-to-like" transfer. This is where you simply move your Traditional TSP funds (all your pre-tax contributions and earnings) directly into a new Traditional 401(k).

This kind of direct rollover is a non-taxable event. The IRS doesn't see it as income because the money never leaves its tax-deferred bubble. Your funds just shift from one pre-tax retirement plan to another, ready to keep growing without any immediate tax hit. The exact same principle applies if you're moving from a Roth TSP to a Roth 401(k).

The Roth Conversion Strategy During a Rollover

Now, this is where things get interesting and where some powerful planning opportunities open up. Instead of a simple like-to-like transfer, you have the option to move funds from your Traditional (pre-tax) TSP into a Roth 401(k). This move is called a Roth conversion.

So, why on earth would you willingly pay taxes now? By converting, you're choosing to pay income taxes on the entire rolled-over amount today, at whatever your current marginal tax rate is. The massive benefit is that in exchange, every qualified withdrawal you take from that Roth 401(k) in retirement will be 100% tax-free.

This strategy is built on the belief—or educated guess—that your tax rate will be higher in retirement than it is today. Paying the tax now could save you from a much bigger tax bite on a much bigger pile of money years from now.

This isn't just a simple transfer; it's a proactive tax planning move. You're effectively prepaying your retirement taxes at a rate you know today, rather than gambling on whatever future tax rates Congress comes up with.

How The Conversion Tax is Calculated

A Roth conversion creates a taxable event because you're officially moving money from a pre-tax account to a post-tax one. The entire amount you convert from your Traditional TSP to the new Roth 401(k) gets added to your ordinary income for the year you make the move.

Let’s walk through a quick example to see how this plays out in the real world.

Scenario: A Retired Federal Employee’s Rollover

Imagine you're leaving federal service with $150,000 sitting in your Traditional TSP. You decide to roll this entire balance into your new employer's Roth 401(k).

• Rollover Amount: $150,000
• Your Federal Marginal Tax Rate: 24%
• Your State Marginal Tax Rate: 6%
• Total Combined Tax Rate: 30%

The tax liability is calculated on the full conversion amount.

• Tax Calculation: $150,000 (conversion amount) x 30% (combined tax rate) = $45,000

In this situation, you'd owe an extra $45,000 in taxes for the year you do the conversion. This is a big upfront cost, which is why it's absolutely critical to have money set aside outside of your retirement accounts to cover the tax bill. Using the retirement money itself to pay the tax is a rookie mistake that can trigger penalties and defeats much of the long-term benefit.

If you want to dig deeper into the mechanics of moving pre-tax money to a Roth account, you might find value in our guide to the TSP to Roth IRA rollover, which follows many of the same tax principles.

Making The Right Tax Decision For You

Deciding whether to do a Roth conversion during your thrift savings plan rollover to 401k really comes down to your personal financial picture and your outlook for the future.

Before you make a call, think through these key factors:

• Your Current vs. Future Income: Do you realistically expect to be in a higher tax bracket in retirement? If you're a high-earner now with a large pension and other income streams waiting for you, paying taxes now could be a very smart move.
• Your Timeline to Retirement: The more years your money has to grow tax-free in that Roth account, the more powerful the conversion becomes. This is a long-term play.
• Your Ability to Pay the Tax: This is the big one. Can you comfortably write a check to the IRS for the conversion tax from a non-retirement source, like a savings or brokerage account? If not, a conversion probably isn't the right move.

This is not a decision to take lightly. It's a strategic choice that exchanges a known, immediate tax payment for the promise of completely tax-free income in the future.

Common Questions About TSP to 401k Rollovers

Even with the best-laid plans, questions are bound to come up when you’re moving your TSP funds. It’s a big decision, and it's completely normal to want to get every detail right. Let's walk through some of the most common questions we hear from federal employees, so you can move forward with confidence.

Getting these things straight from the start is the key to a smooth transition and helps you sidestep any costly surprises down the road.

Can I Roll Over Just a Portion of My TSP?

Yes, absolutely. After you've separated from federal service, you can do what's called a partial rollover, and it's a very common strategy.

Many people go this route because they want to keep some money in the TSP—often to hang on to the low fees or the unique stability of the G Fund. At the same time, they'll move another chunk of their savings over to a new 401(k) to get access to specific investment options the TSP just doesn't offer. You'll just need to specify the exact dollar amount or percentage you want to move on Form TSP-70.

The big takeaway here is flexibility. It doesn't have to be an all-or-nothing move. A partial rollover can give you the best of both worlds, but just make sure you confirm that your new 401(k) plan actually accepts partial rollovers before you get the ball rolling.

What Happens to My TSP Loan if I Roll Over My Account?

This is a huge one, and getting it wrong can have some pretty serious tax consequences. The short answer is: you cannot roll over an outstanding TSP loan. Once you separate from federal service, you have a 90-day window to repay that loan in full.

If you don't pay it back within that timeframe, the TSP will declare the entire outstanding balance a "taxable distribution." This means it gets treated as ordinary income for that year, and if you're under age 59½, you'll almost certainly get hit with an extra 10% early withdrawal penalty. You absolutely need a plan to pay off any TSP loans before you even think about starting a rollover.

How Long Does a TSP to 401k Rollover Take?

This is one of those times where a little patience goes a long way. From start to finish, a direct rollover from the TSP to a 401(k) usually takes anywhere from three to six weeks.

A few different things can affect that timeline:

• TSP Processing: How long it takes them to process your Form TSP-70.
• Mail Delivery: The time it takes for the physical check to get from the TSP to your new plan’s administrator.
• New Plan Processing: How quickly your new 401(k) provider gets that check deposited and invested.

Honestly, the most common reason for a delay is a simple paperwork error. The best thing you can do is double-check every single detail on your forms and don’t be shy about following up with both the TSP and your new provider to keep things moving.

Are There Fees for Rolling Over My TSP?

The good news is that the TSP itself won't charge you a fee to process the rollover request. But don't mistake that for the move being completely "free."

The real cost you need to look at comes from the new 401(k) plan. While there isn't an upfront transaction fee from the TSP, you are moving money from one of the lowest-cost retirement plans on the planet to one that almost certainly has higher fees. Before you make a final decision, you need to dig into the fee disclosure for your new 401(k).

Pay close attention to two things:

• Annual Administrative Fees: These are the costs just to keep the plan running.
• Fund Expense Ratios: These are the internal fees charged by the specific mutual funds you choose.

So, while the rollover itself has no direct TSP fee, the long-term cost of higher annual expenses in the new plan is a critical piece of the puzzle.

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Navigating these details can be complex, but you don't have to do it alone. At Federal Benefits Sherpa, we specialize in helping federal employees understand every aspect of their benefits to secure a confident retirement. For a personalized review of your situation, schedule a free 15-minute consultation at https://www.federalbenefitssherpa.com.