TSP withdrawal strategies and the 4% rule

Retirement reverses your relationship with the TSP. For decades you added money and let it grow, and now you take money out, with the goal of making it last. Sustainable income depends on what your balance can fund through bad markets, not on average returns.

That shift is harder than it sounds, because a plan that works in average years can still fail if a downturn hits early. So the real question is how fast you can safely spend what you have, not how much you saved.

Three things shape your drawdown. Your TSP withdrawal options set how you take money out. A withdrawal-rate rule of thumb sets a sustainable pace, and required minimum distributions eventually force a minimum withdrawal.

Each one gets its own section here, covering how it works and what it trades away. None of them adds up to a strategy on its own, since a workable plan rests on your income, your taxes, and your outlook.

You have several ways to take money from the TSP, and you can combine them. Since the TSP Modernization Act, the rules are flexible: you can take installment payments, single withdrawals, a life annuity, or a full payout or rollover.

Installments are the most common income stream. You can set monthly, quarterly, or annual payments, as a fixed dollar amount or based on your life expectancy, and you can start, stop, or change them at any time.

Single withdrawals and rollovers add flexibility. You can take one-time partial withdrawals whenever you need a lump sum (a new roof, say), even while installments run. You can also move part or all of the balance to an IRA.

A TSP life annuity trades flexibility for certainty. You can use part or all of your balance to buy a life annuity, which pays a guaranteed monthly amount for life. The trade is that the money is locked in and isn’t yours to draw from anymore.

One age rule matters before you start. Early withdrawals normally carry a 10% IRS penalty before age 59 and a half. Federal retirees get an important exception: if you separate in or after the calendar year you turn 55, TSP withdrawals are penalty-free. Special-provision retirees qualify even earlier, under their own rules.

The 4% rule is a rule of thumb for how fast to spend a retirement portfolio. You withdraw about 4% of your starting balance in year one, then adjust that dollar amount for inflation each year, with the aim of income that lasts roughly 30 years.

It came from historical research, in which studies of diversified portfolios over long periods found that a pace near 4% usually survived even bad stretches. The exact number matters less than the idea: spend at a rate your balance can sustain through downturns.

It’s a guideline, not a guarantee. Markets, your mix of investments, and how long you live all change the math. Some retirees use a lower rate to be safe; others adjust their spending up and down as markets move.

Treat it as a starting point. The 4% rule gives you a sane anchor to plan around, not a promise (it’s a rule of thumb, after all). Pair it with your FERS pension and Social Security, which cover part of your needs and ease the pressure on the TSP.

At some point, withdrawals stop being optional. Required minimum distributions (RMDs) force you to start taking money from your traditional TSP at a set age. The age is currently 73, and it’ll rise to 75 in 2033.

RMDs apply to your traditional balance. Once you reach the RMD age, the IRS sets a minimum you must withdraw each year, based on your balance and life expectancy, and you can always take more.

Roth TSP no longer has RMDs. As of 2024, your Roth balance isn’t subject to RMDs while you’re alive. Only your traditional balance counts toward the required amount, which can lower your RMD if you hold both.

Plan for RMDs early, since they can push up your taxable income later in retirement, sometimes by more than you need to spend. Many retirees coordinate earlier withdrawals or Roth conversions to soften the RMD years. A tax professional can help you map it out.

The first few years of retirement carry outsized weight. A market drop early on, while you’re withdrawing, can do lasting damage that good later years can’t fully repair. This is called sequence-of-returns risk.

In simple terms, selling investments to fund income during a downturn locks in losses and leaves less to recover. Two retirees with the same average return can end up very differently, depending on when the bad years hit.

It changes how you draw down, and two common approaches help. One is holding a cushion of stable assets to draw on during downturns, so you avoid selling stocks low. The other is shifting toward stable funds near retirement and trimming withdrawals after a bad year.

Tools exist to test this. Monte Carlo simulation runs your plan through many market sequences, including bad ones, to gauge how often your income covers your spending in every simulated year. A dedicated lesson covers sequence risk in more depth.

A good withdrawal plan starts with your other income, then sets a TSP pace to fill the gap. Your FERS pension and Social Security cover part of your needs for life, and the TSP covers the rest, at a rate you can sustain.

Weigh a few factors. The plan takes its shape from how much guaranteed income you already have and how flexible your spending is. Your tax picture across traditional and Roth, and how long you’ll need the money, matter too.

Questions worth working through:

Your TSP withdrawal plan ties into your whole retirement picture. To see how your pension, Social Security, and TSP fit together, run your free readiness score. For market risk, a Monte Carlo simulation can stress-test the plan. The choice of plan stays with you.

• Income floor. How much do your pension and Social Security already cover, and what gap is left for the TSP?
• Flexibility. Can you spend less after a bad market year, or do you need a steady amount?
• Taxes. Drawing from traditional versus Roth, and timing around RMDs, changes your tax bill.