Tsp Payout Calculator 

A $600,000 TSP balance spread over 25 years at a 5% expected return pays $3,507.54 a month, for $1,052,262.07 in total. That single trade, a longer horizon for a smaller cheque, is the whole job of this calculator. Enter your balance, pick monthly or annual payments, set the horizon in years and the return you expect, and it returns the level payment that amortises the balance over that horizon.

Quick Answer

How to use the TSP payout calculator

Enter four things, read two numbers. The results stay hidden until you calculate.

1. Enter your total account balance: the TSP balance you want to draw down. The worked example has $600,000 pre-filled.
2. Choose a payout type: monthly payments, annual payments, or lump sum. Monthly is the usual retirement-income framing; annual suits a once-a-year draw.
3. Enter the payout horizon in years: how long the payments should last. The example uses 25 years. This field is ignored in lump sum mode.
4. Enter the expected return rate: the annual return you assume the remaining balance earns while you draw it down. The example uses 5%. This field is also ignored in lump sum mode.
5. Click Calculate payout: the headline payment appears, with the total paid over the horizon underneath. Copy or share it with the buttons in the results box.

Invalid inputs are rejected with a plain message instead of a silent $0.00: a blank balance, a negative balance, a blank or zero-or-negative horizon for monthly and annual payments, and a blank or negative return rate. The live tool used to fall back to zero on bad input and could show an infinite payment for a zero-year horizon; this draft blocks that case outright.

The payout formula

Monthly and annual payments use the standard amortising payment formula, the same one behind a loan payment, run in reverse. A balance drawn down at a steady rate over a fixed number of periods has one level payment that exactly exhausts it, assuming the assumed return holds every period.

Payment = balance × (r × (1 + r)ⁿ) ÷ ((1 + r)ⁿ − 1), where r is the periodic rate and n is the number of periods. For monthly payments, r is the annual rate divided by 12 and n is years × 12. For annual payments, r is the annual rate and n is years. When the assumed return is 0%, the formula divides by zero, so the tool falls back to balance ÷ periods, which is the only sensible answer with no growth.

Worked example, step by step: $600,000, monthly, 25 years, 5%. The monthly rate is 5% ÷ 12 = 0.4167%, and the periods are 300. The payment is $600,000 × (0.004167 × 1.004167³⁰⁰) ÷ (1.004167³⁰⁰ − 1) = $3,507.54 a month. Total paid is the unrounded payment × 300 = $1,052,262.07. Annual mode on the same inputs gives $42,571.47 a year and $1,064,286.86 in total, slightly more in total because annual compounding credits the return differently across the year.

What the horizon does to your payment

The horizon is the strongest lever in this tool, stronger than the return assumption. Every extra five years on a $600,000 balance at 5% buys a lower monthly cheque and a longer runway, at the cost of a larger total paid, because the balance stays invested longer.

Read that table with care. A higher total paid is not free money: it is the return earned on money that stayed invested while you waited. If you die before the horizon ends, the unspent balance does not vanish, it remains in the account under the TSP beneficiary rules. If you outlive the horizon, the payments stop, because the formula assumed the balance would be exhausted exactly at the horizon. That cliff is the main risk of a fixed-horizon plan, and it is why the TSP also offers life-expectancy installments that recalculate every year instead of fixing a horizon in advance.

Why this is not the TSP official installment payment

This distinction matters, and the old page blurred it. The TSP offers installment payments computed from IRS life expectancy tables: each January the TSP divides your prior December 31 balance by a factor from the IRS Single Life or Uniform Lifetime Table for your age, then pays that annual amount in monthly instalments. The payment moves every year as your balance and your factor change. This calculator does something different and simpler: it amortises a balance over a horizon you type in, at a return you assume, with one level payment that never changes.

Use this tool to answer "what level payment does this balance support for this many years?" Use the TSP own options, in your TSP account, to set an actual installment election. The two numbers will differ, and the TSP number is the one that governs what you are actually paid. The same caution applies to taxes: TSP installment payments are subject to federal withholding, and the 20% mandatory withholding that applies to eligible rollover distributions does not apply the same way to every installment type, so do not treat this page's pre-tax figure as take-home pay.

Four TSP tools, four different questions

The TSP cluster on this site holds four genuinely different tools, and confusing them is the easiest way to get a wrong answer. Keep them apart by the question you are asking.

If you are still working and contributing, start with the TSP savings calculator and come back here at retirement. If you need money and will pay it back, the TSP loan calculator is the repayable route. If you are retired and want a steady cheque, you are on the right page. If you want one lump sum now, the withdrawal calculator prices the tax and penalty this page deliberately leaves out.

What competing payout calculators miss

Most tools that rank for this query fall into one of two traps. The TSP own Retirement Income Modeler is the authoritative option, but it sits behind the My Account login, so it cannot be used for a quick anonymous check. Third-party annuity calculators, such as the generic TSP annuity tools that ask only for balance, rate and years, run the same amortising formula as this page but present the result as if it were a TSP payment, with no warning that the TSP official installment method differs, and no tax caveat at all.

The reverse-direction tools are a different job dressed in similar words: a monthly-withdrawal calculator that starts from a fixed $3,000 withdrawal and tells you how long the money lasts answers "how long?" where this page answers "how much?" Both are useful, and neither substitutes for the other. The gated income-estimate funnels that quote a single payout rate hide every assumption behind a phone-number form. This page shows its formula, lets you change the horizon and the return, and states plainly that the answer is pre-tax and horizon-fixed, which is more honest than a single-rate quote even though it is less flattering.

The winning moves built into this rewrite are: the horizon table that makes the horizon trade visible before you commit to a number, the explicit separation from the TSP official life-expectancy method, the lump-sum gross-figure warning with a route to the withdrawal calculator, and validation that refuses the old tool's silent $0.00 and infinite-payment cases. The TSP RMD calculator covers the mandatory-distribution side this page leaves out, and the 403(b) payout calculator is the equivalent tool for the 403(b) world.

Common mistakes

The first mistake is treating the horizon as a life expectancy. A 25-year horizon is a planning choice, not a prediction that you will live 25 more years, and the TSP official method does not use a horizon you type in at all. The second is forgetting tax: a $3,507.54 monthly figure from a traditional balance is not $3,507.54 of spending money. The third is assuming the return: 5% every year for 25 years is a smooth average, and real returns arrive in lumps, including bad years early in retirement that hurt more than bad years late, because early withdrawals lock in losses on a larger balance. The fourth is picking the longest horizon to make the monthly number look safe, then finding the payment does not cover core spending. Run the horizon table, compare the payment with your pension and Social Security, and pick the shortest horizon you can afford rather than the longest you can imagine.

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