TSP installments vs. the life annuity: income for life, two ways

1. Turning savings into income

After decades of contributing, the hardest TSP decision comes at the end: how to convert the balance into a reliable monthly income. The TSP gives you several paths — single or partial withdrawals, a rollover to an IRA, recurring installment payments, or a life annuity. The last two both deliver a monthly check, which is why they’re so easily confused. But the mechanics, the risks, and the legacy outcomes diverge sharply.

The choice isn’t really about the size of the check — it’s about who bears the risk. With installments, you keep control and accept the responsibility of making the money last. With the annuity, you trade control for a guarantee. Understanding that trade is the whole decision.

2. Installments: you stay in control

With installment payments, your money stays invested in the TSP and you draw a recurring amount — monthly, quarterly, or annually. You can set it two ways: a fixed dollar amount you choose (the single most popular TSP withdrawal method), or an amount based on the IRS life-expectancy table, recalculated each year.

The defining feature is flexibility. You can raise or lower the payment multiple times a year, pause it, restart it, or take an extra withdrawal when life demands it. You retain ownership of the balance — available for emergencies or opportunities — and whatever remains at your death passes to your beneficiaries. The cost of all that flexibility is responsibility: the money is exposed to markets, and a fixed-dollar draw that’s too high can run the account dry.

3. The life annuity

The TSP life annuity is a different animal entirely. You take some or all of your balance and use it to purchase a single-premium immediate annuity from MetLife, the TSP’s annuity provider. In return, MetLife pays you a fixed monthly amount for the rest of your life — guaranteed, regardless of how markets move or how long you live.

What you gain is certainty: predictable income, no investment decisions, and no chance of outliving the money. What you give up is just as real. The purchase is irreversible — a single-premium immediate annuity can’t be surrendered, so the lump sum is gone for good. In its basic life-only form, payments stop at your death with nothing left to heirs. And the guarantee rests on MetLife’s financial strength, not the federal government.

4. Control vs. certainty

Lined up side by side, the contrast is clean:

Neither column is “right.” If your worst fear is outliving your money, the annuity’s guarantee is exactly the medicine. If your worst fear is losing access and leaving nothing behind, installments keep the money in your hands. The next tool helps you see which risk is real for your numbers.

5. How long will your money last?

The central question for installments is whether the money lasts. Enter your balance, age, a monthly withdrawal, and an expected return; the calculator projects when installments would run out and what might remain for heirs — the contrast the annuity’s “never runs out, but $0 legacy” makes vivid.

6. Annuity options that change the math

If you do lean toward the annuity, the features you pick reshape the payment and the protection:

• Single vs. joint life. A single-life annuity pays for your life only. A joint life annuity (with a spouse or someone with an insurable interest) continues to a survivor — you choose a 50% or 100% survivor benefit, with 100% paying less per month because the insurer carries more risk.
• Level vs. increasing. Level payments stay flat for life — simple, but inflation steadily erodes them. Increasing payments rise about 2% a year to fight inflation, in exchange for a lower starting amount.
• Cash refund / ten-year certain. A cash refund returns any unused balance to your beneficiaries. A ten-year certain feature continues payments to heirs if you die within ten years (single-life only). Both restore some legacy — at the cost of a smaller monthly check.

One bright spot: annuity payments aren’t subject to the mandatory 20% withholding or the early-withdrawal penalty that can apply to other distributions — though they’re still taxed as ordinary income, like any traditional TSP money.

7. Why installments win for most feds

Here’s the reason the annuity has long been the least popular TSP choice: federal retirees usually already own two guaranteed lifetime income streams — their FERS or CSRS pension and Social Security. Both are inflation-adjusted (the FERS supplement aside) and paid for life. If those already cover your essential expenses, there’s little reason to convert your one flexible, growth-oriented, inheritable account into a third fixed annuity.

Add the annuity’s irreversibility, the inflation erosion of level payments, and the loss of legacy, and most feds reasonably keep the TSP in installments — where it can keep growing and still pass to family. The annuity earns its place mainly when your guaranteed income would otherwise fall short of your essential costs, and you want to close that gap for certain.

8. The hybrid answer

The decision isn’t binary, and the best answer is often both. You can use a portion of your TSP to buy a life annuity — enough to lift your guaranteed income up to your essential expenses — and keep the rest in installments that stay flexible and inheritable.

This “income floor” approach captures the annuity’s certainty where you need it most while preserving liquidity and legacy with the remainder. Don’t forget that the traditional portion of whatever you keep is still subject to required minimum distributions at 73 — another reason to keep your income plan, your RMDs, and any annuity decision lined up together rather than made in isolation.

9. Frequently asked questions