The Best Way to Take TSP Withdrawals (And What to Avoid)

For many federal employees, the Thrift Savings Plan (TSP) is the crown jewel of their retirement strategy. You’ve spent decades “climbing the mountain”—saving diligently, watching the markets, and reaching that peak where you finally have enough to step away from federal service.

However, many retirees soon realize that getting up the mountain is only half the journey. Getting down safely—meaning, getting your money out without losing a massive chunk to the IRS—is where the real challenge begins. If managed poorly, your TSP can turn from a dream nest egg into an absolute tax nightmare.

The Default Trap: The Traditional TSP

Most federal employees have the vast majority of their money in the Traditional TSP. This is the default for most careers: you get a tax deduction when you put the money in, but every dollar that comes out is fully taxable as ordinary income.

If you aren’t sure which type you have, it is almost certainly Traditional. While the Roth TSP allows for tax-free growth and tax-free withdrawals, most “old school” feds accumulated their wealth in the pre-tax bucket. This creates a “tax bomb” that can explode if you take large, unplanned withdrawals.

What to Avoid: The Lump-Sum Spike

Imagine you enter retirement with a $1 million TSP balance and a $100,000 mortgage remaining. It’s tempting to say, “I’ll just take $100,000 out, pay off the house, and live debt-free.”

Here is the problem: The TSP won’t just send you $100,000. Because it’s taxable, they are required to withhold federal taxes (often 20% or more). To actually net the $100,000 you need for the bank, you might have to withdraw closer to $130,000.

Why this is dangerous:

• Tax Bracket Creep: Adding $130,000 of taxable income on top of your FERS pension and Social Security could easily push you into a much higher tax bracket.
• Permanent Loss of Growth: That extra $30,000 you sent to the IRS is money that can no longer grow for you.
• Medicare Premiums: A massive spike in income can trigger IRMAA surcharges, making your Medicare Part B and D premiums much more expensive two years down the road.

The Fix: If you need a large sum, spread it out over multiple tax years to keep your income “smooth” rather than creating high peaks and deep valleys.

Three Main Ways to Access Your Money

As of 2026, the TSP offers three primary ways to withdraw your funds. Choosing the right one depends on your need for flexibility versus certainty.

1. Installment Payments

This is the most popular choice for creating a “paycheck” in retirement. You can set up monthly, quarterly, or annual payments.

• Fixed Dollar Amount: You choose the amount (e.g., $2,000/month).
• Life Expectancy: The TSP calculates the amount based on IRS tables.
• Flexibility: You can stop, start, or change these amounts at any time.

2. Single Withdrawals

In the past, the TSP was famous for its restrictive rules, including a frustrating 30-day waiting period between withdrawals. As of May 2024, that 30-day rule has been eliminated. You can now take partial withdrawals as often as you need, providing much-needed liquidity for life’s unexpected expenses.

3. The Life Annuity (Proceed with Caution)

The TSP offers an annuity through MetLife. You give them a portion of your TSP, and they guarantee you a monthly payment for life. While “guaranteed income” sounds great, most financial experts advise federal employees to be cautious here.

• Loss of Control: Once you buy the annuity, that money is gone. You cannot “undo” it if you have an emergency.
• Low Rates: Historically, the internal interest rates for these annuities are quite low compared to what you might earn by remaining invested.
• Redundancy: As a federal employee, you already have two “annuities”: your FERS pension and Social Security. Locking up your TSP—the only part of your retirement that is truly flexible—often leaves you “cash poor” when you need a lump sum.

Avoiding the RMD “Cliff”

The second big mistake retirees make is ignoring their TSP entirely. If you have a healthy pension and Social Security, you might not “need” the money at age 62. But the IRS eventually wants its cut.

Required Minimum Distributions (RMDs) are mandatory withdrawals you must start taking once you reach a certain age. Here is a great chart:

If you let your TSP grow untouched until age 75, your first RMD could be massive, forced-landing you into a high tax bracket exactly when you want to be relaxing.

The Strategy: Roth In-Plan Conversions

Starting in January 2026, the TSP introduced a game-changing feature: Roth In-Plan Conversions. You can now move money from your Traditional TSP to your Roth TSP within the plan.

• You pay the taxes now (ideally in those “low-income years” early in retirement).
• The money then grows tax-free forever.
• Crucially, Roth balances are no longer subject to RMDs.

By “smoothing” your taxes early through small, annual conversions, you can dismantle the tax bomb before it has a chance to go off.

Summary of Best Practices

Retirement is about more than just having money; it’s about having a plan to keep as much of it as possible. By avoiding the lump-sum trap and utilizing the new 2026 Roth conversion rules, you can ensure your “downward trek” from the mountain is as smooth as the climb up.