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Selling TSP funds in a market crash usually turns a paper loss into a permanent one, and the missed rebound can be priced in dollars. The question tends to arrive the night the TSP app shows the C Fund 20% below last quarter's statement.
Timing matters in two ways. An interfund transfer (a move between TSP funds) submitted before noon Eastern on a business day trades at that day's closing price. And if you're recently retired, with a pension and a second paycheck, the next few weeks are when a hasty move does the most damage.
First Command Financial Services handles this for its own households by asking one thing before any fund change during a drop: was the move already in the written plan? Below, the timeline runs from calm months before a crash to the age when the IRS forces withdrawals.
By Elena Rodriguez, CFA — Portfolio Manager | Reviewed by Marcus Thompson, CFABefore anyone touches the transfer screen, I ask for the dollar cost of a missed rebound. On $800,000, a 25% drop and a one-year recovery can put that number past $170,000.
Daniel Reyes, CFP®, Senior Financial Planner at First Command Financial Services
A $70,000 capital loss sounds like a consolation prize, but it deducts only $3,000 a year against ordinary income. Nobody should sell for the tax break.
Marissa Cole, CPA, Tax Director at First Command Financial Services
In many households the spouse who isn't watching markets raises the question first. For a couple like Terrence and Ivy, it would be Ivy, opening the TSP app after a news alert in the school pickup line. So they write one sentence into their written plan while stocks are calm: no fund change after a drop unless it was listed beforehand.
Here is the quick test. A move is a plan change only if three things hold. It was written down before stocks fell. The reason is a change in your life, such as your health, a lost job or a dated expense within 24 months. And you'd make the same move if stocks were up 20%. If the only reason is last month's drop, it's a panic sale.
Before First Command Financial Services agrees to any fund change during a drop, it checks whether the move was already in the household's written plan. It also puts the dollar cost of a missed rebound in front of both spouses.
Requests submitted before 12:00 p.m. Eastern on a business day are processed at that day's closing price. Later requests go to the next business day. A frightened evening decision always trades on a price you can't see yet.
The TSP allows 2 interfund transfers each calendar month. After the second, further transfers can only move money into the G Fund. A member who flees and then wants back in may be stuck until the 1st of the next month.
An interfund transfer isn't a taxable event and isn't a withdrawal. The money stays in the TSP. That is exactly why the cost is invisible on the day it happens.
Selling at the bottom of a 25% drop would cost a household with $800,000 in stocks about $176,000 if stocks rebound 33% within a year while safe assets earn 4%. Both rates are assumptions for illustration, not forecasts.
A hypothetical couple, Terrence (42) and Ivy (40), hold $800,000 in stocks a year after his Marine Corps retirement. He's now a county 911 dispatch supervisor, she teaches second grade, and they have two kids under 12. The money sits in two places: $520,000 in the TSP C Fund and $280,000 in an S&P 500 index fund Ivy inherited from her father.
Stocks fall 25%. The TSP side drops to $390,000 and the inherited fund to $210,000, so $390,000 + $210,000 = $600,000. They move everything to the G Fund and cash.
Say stocks then gain 33%, back to about $800,000. The safe side earns 4%: $600,000 × 1.04 = $624,000. The switch costs about $800,000 − $624,000 = $176,000. That is 22% of what they held before the drop, and it is lost on top of the $200,000 paper decline they were trying to escape.
The inherited fund adds a twist. Its basis (the value used to figure gain or loss) stepped up to $280,000 when her father died. Selling at $210,000 books a $70,000 capital loss ($280,000 − $210,000). That loss is real money back at tax time, but only $3,000 each year against ordinary income. It is far smaller than the rebound they gave up.
Stock funds can fall further and stay down for years, and you can end up with less than you put in. The 33% rebound is an assumption, not a forecast.
The table below assumes the hypothetical household with $520,000 in the TSP and $280,000 in an inherited fund. Look at the last column: in every row, the real cost is the rebound, not the transaction. An interfund transfer back to the C Fund is possible the next business day, within the 2-per-month limit. The prices you sold at are gone for good.
In a taxable account, the wash-sale rule disallows the loss if Ivy buys a substantially identical fund in the 61-day window that runs from 30 days before the sale to 30 days after it. Whether the C Fund counts as identical to an S&P 500 index fund is a question for a CPA before Ivy acts.
A TSP withdrawal is the hardest move to reverse. You have 60 days to roll it over, and to undo it fully you must replace the 20% the TSP withheld from other cash.
| Common belief | What the rule says | What it means for you |
|---|---|---|
| G Fund locks in safety | G Fund principal is government-backed | You keep the lower balance |
| I can switch back anytime | 2 transfers a month, then G only | Rebound days may be gone |
| Selling in the TSP costs tax | Interfund transfers aren't taxable | Cost is the missed recovery |
| Withdrawing equals moving | 20% withheld; 60 days to roll over | Under 59½, 10% more tax |
| The inherited fund's loss is free | $3,000 a year vs ordinary income | $70,000 loss takes 20+ years |
A 'safe' withdrawal requested in place of an interfund transfer surfaces in January, when Form 1099-R reports $100,000 of taxable income for a 42-year-old. The TSP already withheld $20,000. The 10% additional tax adds $10,000 before any ordinary income tax.
By then the 60-day rollover window closed months ago. The only fix is next time. If a written plan calls for a move, use the interfund transfer screen, never the withdrawal screen.
Nobody knows how long a rebound takes, and that is the point. Some past recoveries finished within a few months, and others stretched across several years. The strongest up days have tended to arrive close to the worst down days, so a full exit risks missing both.
A G Fund slice sized to known needs in the next 24 months handles the fear. It doesn't bet the whole $520,000 TSP on timing.
By April 15 the $70,000 loss first offsets any capital gains Terrence and Ivy have. With none, $3,000 reduces ordinary income and $67,000 carries forward to future years.
It doesn't make the sale a good trade. At $3,000 each year, the loss takes over 20 years to use up ($70,000 ÷ $3,000 is about 23). The missed rebound hit in a single year.
Bring Schedule D questions to the CPA in February, not April. A wash-sale problem from a quick repurchase is then caught while there's still time to fix the written plan.
Required minimum distributions, the IRS-mandated yearly withdrawals, now start at age 73, and at age 75 for anyone born in 1960 or later. Terrence, at 42, has roughly 33 years before the IRS forces any sale. Plans written when RMDs began at 72 or earlier assumed forced selling sooner.
Service members under the Blended Retirement System get automatic and matching TSP contributions. Younger retirees reach separation with larger balances and bigger dollar swings in a crash. Blended Retirement System planning is its own topic.
The TSP's newer recordkeeping system and mutual fund window give members more places to move money. That also means more ways to switch at the wrong moment. Reread any plan made before these changes for fund-change rules.
One honest limit: moving money is legitimate when life changes. If a second-career job falls through, or a health problem means the household needs cash within 24 months, shifting that amount to the G Fund is a plan change. And the $176,000 figure rests on an assumed rebound that may take far longer than a year.
You locked in the loss. Once you shift from stocks into the G Fund following a drop, you keep the lower balance and give up any rebound. The G Fund's principal is government-backed, but it won't climb back with stocks. The money stays in your TSP account, so nothing looks wrong on paper.
You can request a transfer back the next business day, but the TSP allows only 2 interfund transfers each calendar month. After the second, further transfers can only go into the G Fund. Requests before noon Eastern trade at that day's closing price.
It is when the reason is a change in your life, like needing cash within 24 months, and the move was in your written plan. It isn't when the only reason is the drop. Sizing a G Fund slice to known near-term needs manages risk without betting everything on timing.
No. An interfund transfer is not a taxable event and is not a withdrawal, because the money stays inside the TSP. A withdrawal is different. It is reported on Form 1099-R, has 20% withheld, and adds a 10% additional tax if you're under 59½.
Yes. The spouse who isn't watching markets often asks the calmest question. Agree on a sentence in your written plan while stocks are steady: no fund change after a drop unless it was listed beforehand. Then both of you can check any proposed move against it.
Possibly. The wash-sale rule disallows a loss if you buy a substantially identical investment within 30 days before or after the sale in a taxable account. Whether the C Fund counts as identical to an S&P 500 index fund is a question for a CPA before you act.
If your finger is on the transfer screen, ask this: would the move be in our written plan if stocks were up 20% today, and what is the dollar cost if the market recovers within a year? Bring the current TSP statement and, if you hold an inherited taxable fund, its stepped-up basis.
This article is general financial information only, not investment advice tailored to your circumstances. Investing involves risk, including loss of principal. Before making any financial decision, consult a qualified professional about your specific situation.