TSP Fund Returns July 2026: S Fund Falls 4.12%, I Fund Leads

Last Updated: August 5, 2026 Reading Time: 7 min

If you saw a headline in early August claiming three of the five core funds gained in July, it was wrong. One large federal-news outlet ran that line while its own data table showed the losses above. The G Fund was July's only gainer.

The S Fund's two red months erased chunks of its gains, and it still sits at +13.52% for the year. The fund that punished you in March delivered +9.96% four weeks later. That whipsaw is the price of owning small caps, and it cuts both directions.

The G Fund has now "won" two months of 2026, both by simply not losing. That is its entire job. It earns a statutory rate and cannot lose principal, which looks brilliant in months like July and costs you badly over full years: +2.57% YTD against the I Fund's +15.35%.

The I-over-S gap is now $1,830 on a $100,000 balance. At the June 30 midpoint, the S Fund led the I Fund. One month flipped the order.

Why Each Fund Moved in July

S Fund (-4.12%): The Russell 2000, the index of small and mid-cap U.S. companies the S Fund tracks, declined in July. A stronger-than-expected jobs report pushed out expectations for Federal Reserve rate cuts, and small companies carry more debt relative to their size, so fading rate-cut hopes hit them hardest. The pullback concentrated in the back half of the month.

C Fund (-0.07%): Large-cap stocks essentially held their ground. The 4-point spread between the C and S Funds in a single month is the size-factor risk of the S Fund made visible.

F Fund (-1.29%): The same rate dynamic that hurt small caps pushed bond yields up, and bond prices move opposite yields. A 1.29% monthly loss is a meaningful move for a bond fund, and it dragged the F Fund negative for the year at -0.56%. It is the only core fund underwater for 2026.

I Fund (-1.01%): International developed markets slipped modestly, and a firmer dollar reduced the converted value of overseas holdings. The I Fund is not currency-hedged. Even so, its smaller July loss was enough to retake the YTD lead.

G Fund (+0.39%): Congress sets the G Fund's rate structure, and it cannot lose principal. In a month where everything else fell, it did exactly what it exists to do.

The Month After the Record Is Where Mistakes Happen

The sequence matters more than the numbers. June handed the S Fund its best month of the year and the 2026 lead. On July 1, FRTIB data showed a record 224,420 TSP millionaires, up more than 21% in a single quarter. Then July took 4.12% back.

That sequence is where mistakes get made. Anyone who shifted into the S Fund after June's headlines bought within weeks of a 4% drop. The drop itself feels worse than it should, because losing money right after seeing a record stings more than the same loss in a flat month, and that amplified sting is what pushes people to sell. And July made the G Fund look smart, but swapping into it after a red month locks in the loss and trades a +13.52% YTD position for a +2.57% one.

The 224,420 millionaires got there by contributing through months like July for decades, not by dodging them. We covered how that record was built in our TSP millionaire analysis.

Model Your Own Allocation

One red month reads very differently at 30 than at 59. Use the free TSP Calculator to model how your current mix of funds compounds to retirement, and what a 4% down month actually does to a 25-year projection. If you are weighing a mix change, run both allocations side by side before you touch anything.

Frequently Asked Questions

What did TSP funds return in July 2026?

The S Fund fell 4.12% and the I Fund dropped 1.01%. The F Fund lost 1.29% and the C Fund was nearly flat at -0.07%. Only the G Fund gained, returning +0.39%.

Which TSP fund is leading 2026 year-to-date after July?

The I Fund reclaimed the lead at +15.35% through July 31. The S Fund is second at +13.52%, the C Fund third at +10.13%. The F Fund is the only core fund negative on the year at -0.56%.

Why did the S Fund drop 4.12% in July 2026?

The Russell 2000 declined as a strong jobs report cooled rate-cut expectations, and small caps are more rate-sensitive than the large caps in the C Fund. The C Fund's flat month next to the S Fund's 4% drop shows exactly that split.

Was July the S Fund's worst month of 2026?

No. March was steeper at -4.58%. July is the second-worst month, and the S Fund is still up 13.52% on the year.

How did the L Funds perform in July 2026?

All declined modestly, from L Income at -0.06% to the long-dated L 2055-2075 funds at -0.92%. Shorter-dated funds lost less because they hold more G Fund. Every L Fund remains positive for 2026.

Should I move my TSP out of the S Fund after July?

The scoreboard argues no. Leadership has changed six times in seven months. Chasing the rotation means buying after gains and selling before recoveries. Set the allocation that matches your timeline and let the months cancel out.

Related Resources

• TSP Calculator: Model your balance growth by fund mix and contribution rate.
• TSP Fund Returns June 2026: The record month that set July up.
• TSP Millionaires: Consistency Beats Timing: How 224,420 accounts crossed $1 million.
• Best TSP Allocation by Age: Benchmark mixes for each career stage.

Sources: FRTIB monthly returns via TSP.gov fund performance, FedSmith (Aug 2, 2026), GovExec (Aug 2026).