TSP G Fund in Retirement: A 5-Year Rule and a $150,000 Worked Example

The G Fund in retirement: no principal loss, full income tax on the way out

The G Fund holds special nonmarketable US Treasury securities, so it can't lose principal. That's the whole safety story. Traditional TSP dollars are still taxed as ordinary income when they leave the plan, whichever fund they sat in. Moving money between funds isn't a taxable event, and the TSP sends a Form 1099-R only when money actually leaves. So the G share is a risk decision. It never saves tax by itself.

How many years of income draws should the TSP G Fund in retirement cover?

Size the cushion at 5 times your yearly gap, which is spending minus pension minus steady earnings. A $30,000 gap means $150,000 in the G Fund. Count only the income draws the pension doesn't cover, because pension dollars already behave like a bond and don't get added a second time.

For scale, take a hypothetical retiree with a $900,000 TSP and a $36,000 gap. Five times $36,000 is $180,000 in G. That's 20 percent of the account. But don't read it as a fixed percentage of the balance. Someone with the same $900,000 and a $10,000 gap needs only $50,000, about 6 percent.

If the pension and earnings cover all spending, the gap is zero. Then hold about 1 year of irregular costs (a roof, a car, roughly $15,000) and no more. Extra G money in that case is just a drag on growth.

We would rather size the cushion to 5 years of gap than to an age-based percentage, because the gap, not the birthday, decides how many months you'd be forced to sell stock in a downturn.

At age 57 the 401(k) pays first, and the G Fund waits for 59½

Lyle and Thuy (hypothetical) are 49 and 47. Lyle retired as a Navy chief at 41 and now supervises utility line crews. Thuy runs a small salon. They plan for Lyle to stop work at age 57, and we'll use today's balances for illustration: $310,000 in his TSP and $250,000 in his utility 401(k), $560,000 in all.

Their spending is $7,500 a month. Subtract his $2,900 pension and $2,100 from Thuy's salon, and $2,500 a month is left. That's $30,000 a year. Five years of it is 5 × $30,000 = $150,000. The site's calculator runs this kind of gap math with your own numbers.

The age threshold changes where the money sits. Lyle left the Navy at 41, so TSP money he draws before age 59½ owes the 10 percent additional tax. His 401(k) is different: he separates from the utility at 57, and the IRS exception covers a job you quit in or after the calendar year you turn 55. So the first 2.5 years (2.5 × $30,000 = $75,000) sit in the 401(k)'s stable value or bond fund. The other $75,000 goes in the G Fund.

That $75,000 is 24 percent of the $310,000 TSP, 30 percent of the $250,000 401(k) and about 27 percent of the $560,000 combined. Pulling the first $75,000 from the TSP instead would cost $7,500 in penalties. That saving is real, unlike a mere shift of tax from one year to another.

The cushion costs something. At an assumed 3 percentage points less a year than stocks, $150,000 gives up about $4,500 a year. In a hypothetical 2-year, 25 percent stock drop, each $30,000 draw taken from the cushion avoids selling shares worth $40,000 before the drop ($30,000 ÷ 0.75), so it saves $10,000 a year. The cushion breaks even in year 4. Hold it past the decline and the cost overtakes the benefit again. Unlike G, stock funds can drop and take years to come back, and none of these figures is a forecast.

The TSP takes draws proportionally from every fund, so you can't pull from G alone. In a down year, take the draw, then make an interfund transfer from G to C for the stock portion that was sold. No tax applies, and the spending has effectively come out of G.

Sizing the gap and the cushion

Which account pays the first 2.5 years

Drawing from G in a bad year

$4,500 a year buys the cushion: how Edgepoint Wealth Management weighs it for 2 households

A bigger G share buys income draws you never have to time. You give up assumed growth: 3 percentage points on $150,000 is about $4,500 a year, for illustration. Lyle and Thuy should accept that cost, because they'll sell investments every month for 10 years before Social Security starts at age 67.

Now a contrast household (hypothetical). A retired Army master sergeant is also 57 with $560,000. Her $4,800 pension plus $2,700 of part-time pay cover the same $7,500 a month. Her gap is zero and her draws are optional, so about $15,000 in G (under 3 percent) is enough. The rest can stay in stock funds.

Same age, same balance, opposite answers. Edgepoint Wealth Management asks for the gap before it asks for the risk tolerance score.

4 beliefs about the G Fund that cost retirees money

Treasuries are tax-free, so G money is too. Wrong. Traditional TSP draws are ordinary income federally, whichever fund they came from, and state treatment follows each state's retirement-income rules, so check yours.

In a bad year I'll just take my draw from the G Fund. The TSP takes draws proportionally from all funds, so that isn't a choice you get. The fix is the no-tax interfund transfer from G to stocks after the draw.

Moving to G after a drop protects me. It locks in the loss on the shares you moved. And the limit of 2 transfers a month makes a quick reversal awkward.

My pension is a bond, so I need no G at all. That holds only when the pension covers spending. Lyle's $2,900 covers well under half of $7,500.

How long do you have to undo a G Fund move?

A fund mix can be changed any day at no tax. The TSP allows 2 interfund transfers per calendar month that move money among funds, and after that, transfers can only go into G until the next month. A draw is different. Once paid, it is taxed and any penalty stays.

The only way back is rolling most one-time payments into an IRA or eligible plan within 60 days, which installment series of 10 years or more can't do.

A code 1 on the January 1099-R and 2 other errors with a price tag

A $40,000 TSP draw at age 58 shows up in January on Form 1099-R with distribution code 1, and the preparer adds Form 5329 with a $4,000 additional tax. The retiree had left the Navy at 41, so the 10 percent penalty applied to the TSP even though a 401(k) left at 57 would have been open. The IRS counts the separation age plan by plan.

Moving 100 percent of $560,000 into G and stable funds at retirement gives up about $16,800 a year of assumed growth (3 percentage points, for illustration). Over 10 bridge years that adds up to $168,000 before compounding. It feels safe. It's a slow leak.

Taking the 401(k) cushion as 1 lump sum triggers 20 percent mandatory federal withholding and puts $75,000 on one return instead of about $30,000 a year. Check whether the plan allows partial payments after separation before counting on it. Tax planning for veterans covers how to spread income across years.

The penalty letter

The all-safe portfolio

The lump sum

6 lines to check in your TSP and 401(k) before the first income draw

Run these against your own accounts. If you can't fill in a line, that's your first task.

Then the first moves, in order. Write down spending minus pension and steady earnings, and multiply by 5. Confirm the penalty-free age for each account. Put the first years of cushion in the account that opens first. Set the G share last, with an interfund transfer that costs no tax. Edgepoint Wealth Management goes through these steps, in this order, with each client before a single dollar moves between funds.

One honest limit: the 5-year rule doesn't fit someone whose 401(k) allows only a single lump-sum payment after separation, or whose gap closes within 2 or 3 years. And because the G Fund trails stocks over long stretches, a cushion bigger than the gap years becomes a steady drag.

• The age you left each employer, military and civilian
• Whether each plan allows partial payments after separation
• Your G share today in dollars, versus 5 × your yearly gap
• Which account is penalty-free first
• How many interfund transfers you've used this month
• Whether a stable value or bond fund exists in the 401(k)

What age opens each account without a penalty? The question for Edgepoint Wealth Management

Bring this to Edgepoint Wealth Management: which of my accounts can I draw from penalty-free in the year I stop working, and how big should the G share be once those first years are covered? The answer turns on the age you left each employer, so bring separation dates for the military and the current job.