▟ Treasury Rate Watch Data as of Aug 31, 2026

Average interest rate

Government Account Series Inflation Securities

The inflation-indexed slice of the trust-fund holdings. Like TIPS, the rate shown is the real coupon, with inflation compensation paid through principal rather than interest — which is why it reads far lower than the nominal Government Account Series.

Latest (Aug 2026)
1.39%
■ no change MoM
Year-over-year
▲ +0.151 pp
vs. Aug 2025
13-year low
0.99%
Oct 2021
13-year high
1.39%
Jul 2026

This is an average, not today's rate. For today's market real yields on inflation-indexed Treasuries, see TIPS real yields — 2.62% on the 10-year.

Government Account Series Inflation Securities — average rate history

Monthly, Jan 2013 – Aug 2026.

0.9%1.1%1.2%1.3%1.4%2014201620182020202220242026 1.39%

Download: rates-government-account-series-inflation-securities.csv · CSV · public domain

Last 24 months

MonthAvg. rateMoM
Aug 20261.392%■ no change
Jul 20261.392%▲ +0.001 pp
Jun 20261.391%▲ +0.042 pp
May 20261.349%▲ +0.001 pp
Apr 20261.348%■ no change
Mar 20261.348%▲ +0.001 pp
Feb 20261.347%▲ +0.050 pp
Jan 20261.297%▼ -0.014 pp
Dec 20251.311%■ no change
Nov 20251.311%■ no change
Oct 20251.311%▲ +0.070 pp
Sep 20251.241%■ no change
Aug 20251.241%■ no change
Jul 20251.241%■ no change
Jun 20251.241%■ no change
May 20251.241%■ no change
Apr 20251.241%▲ +0.001 pp
Mar 20251.240%■ no change
Feb 20251.240%▲ +0.062 pp
Jan 20251.178%▼ -0.013 pp
Dec 20241.191%■ no change
Nov 20241.191%■ no change
Oct 20241.191%▲ +0.061 pp
Sep 20241.130%—