Dale retired from a regional Forest Service office in the spring of 2022 with a healthy TSP balance and a plan he'd been polishing for years. He was 85 percent in stock funds, a posture that had served him well through a long bull market. Then came the fall. By October his balance was down roughly a fifth, and he was pulling monthly withdrawals out of it for the first time in his life.

He didn't panic. But he told me something I've heard in various forms for twenty years: "I wasn't afraid of losing money. I was afraid of losing it now."

He had put his finger on sequence-of-returns risk. A bond tent is one way to manage it, and the G Fund happens to be a very good tool for the job.

What a bond tent actually is

Picture your stock allocation over time as a line on a chart. In a typical glide path, it slopes steadily downward as you age. In a bond tent, the stock line dips as you approach retirement, hits its lowest point around the day you stop working, then climbs back up over the following years. Plot the bond allocation and it looks like a tent, peaking at retirement.

The logic is simple. A big market drop hurts most when your balance is at its largest and you're about to start withdrawing. Sell shares in a down market to fund living expenses, and those shares aren't there for the recovery. A rough first few years can damage a portfolio permanently, while the same losses ten years in barely register.

So you hold more in safe assets during that danger window, then rebuild stock exposure once the early-retirement risk has passed.

Why the G Fund fits

The G Fund holds special-issue Treasury securities available only to TSP participants. It carries no credit risk and, unusually, no price risk. Its share price never falls, and it has never had a down month. Its interest rate tracks the average yield on Treasuries with four or more years to maturity, so you get something close to intermediate-term rates without the price swings that normally come with them.

Most bond funds can't say that. The F Fund dropped sharply in 2022 when rates rose, which is exactly the kind of year a bond tent is supposed to protect against. The G Fund simply kept paying.

Check tsp.gov for current and historical G Fund rates. They move month to month.

A worked example

Take Maria, 61, who plans to retire at 62 with $800,000 in her TSP. She's currently 80 percent in stock funds (C, S, and I) and 20 percent in the G Fund.

At 80/20, she holds $640,000 in stocks. A 35 percent decline, not unheard of, takes $224,000 off her balance, about 28 percent of the total.

Now suppose she shifts to 50/50 by retirement: $400,000 in stocks, $400,000 in G. The same 35 percent stock decline costs $140,000, or 17.5 percent of her total. Painful, but survivable. And her withdrawals for the next several years can come from a stable pool rather than depleted shares.

Her glide path might look like this:

  • Age 57: 70 percent stocks
  • Age 62 (retirement): 50 percent stocks
  • Age 67: 60 percent stocks
  • Age 72: 70 percent stocks

Those are illustrative numbers, not a prescription. Your own tent should reflect your pension, Social Security timing, spending needs, and nerve.

The part federal retirees often overlook

If you're under FERS with a pension and a Social Security check coming, your portfolio may only need to cover a gap. A retiree whose guaranteed income covers 80 percent of expenses has far less sequence risk than someone drawing everything from savings. For some people, a pronounced tent solves a problem they barely have.

That doesn't mean ignore it. Pension income can make a more aggressive stock allocation reasonable. But if your pension is modest, or you're retiring before your Social Security kicks in, the tent deserves real consideration.

The mechanics inside the TSP

This is where theory meets the system's quirks.

Lifecycle funds won't build a tent. L Funds shift steadily toward the G and F funds over time, and they keep going. If you want the rising-equity second half of the tent, you'll need to build the allocation yourself with individual funds.

TSP withdrawals come out pro rata. When you take money from your account, it draws proportionally from every fund and from your traditional and Roth balances. You can't say "take it all from the G Fund this year." That makes the rebuilding phase a rebalancing job. Once a year, move money from the G Fund into your stock funds through an interfund transfer to follow your glide path. The TSP limits how many transfers can move into non-G funds each month, so check tsp.gov for current rules before planning anything frequent. For an annual rebalance, it's rarely an issue.

A split-account approach is possible. After separation, you can transfer part of your TSP to an IRA. Some retirees keep the TSP as their bond bucket, heavy in G, and hold stock index funds in the IRA. Then withdrawals can come from the TSP side deliberately. It adds complexity, and the TSP's low fees are worth weighing against IRA costs, but it solves the pro rata problem. The IRA can't hold the G Fund itself, so the safe money has to stay in the TSP. Confirm current partial-transfer rules at tsp.gov.

What can go wrong

A bond tent is insurance, and insurance has a premium.

The G Fund's long-run return is modest. Over some stretches it has barely kept pace with inflation, and in a few it has lagged. Park half your portfolio there for years and you give up growth. If markets rise sharply in your first retirement years, you'll watch gains you didn't capture.

The research is also less settled than the headlines suggest. Studies supporting rising equity glide paths show the benefit is real but depends on assumptions about returns, withdrawal rates, and starting valuations. It reduces the odds of a bad outcome. It doesn't eliminate them.

And there's the behavioral risk. Rebuilding stock exposure in year six or seven means buying more stocks, possibly after a market decline, which feels wrong when you're nervous. A plan only works if you follow it. Write the schedule down now, while you're calm.

Putting it into practice

Start by figuring out how much your guaranteed income covers. That sets how much sequence risk you're carrying.

Then choose a retirement-date stock allocation you could live with through a 30 percent drop. Not one you hope to tolerate. One you'd actually hold through.

Pick your glide path, set an annual date to rebalance (many people use their birthday or January), and note the plan somewhere you'll find it. If you aren't sure how your pension and withdrawals interact, a fee-only planner who understands FERS can earn their fee here.

Dale, for what it's worth, moved to 60 percent stocks that winter and plans to climb back slowly. He sleeps better. His balance still has a few good years in front of it, and he's counting on the G Fund to keep the lights on while they arrive.