The federal government's gross interest bill reached $1.17 trillion through July. Of its five biggest marketable pieces, the only two shrinking are the short, floating end.

The U.S. government's gross accrued interest on the public debt reached $1.170 trillion in the first ten months of fiscal 2026 — October 2025 through July 2026 — up from $1.017 trillion in the same ten months a year earlier and $956.3 billion two years earlier. The wire numbers stop at that total. We read the Treasury's full interest-expense ledger underneath it, every security type and every month, and the single figure hides five pieces moving in two directions. Of the $900.1 billion owed this fiscal year on securities held by the public, five categories carry 98.4% of it: Treasury notes ($410.5 billion), bills ($209.2 billion), bonds ($147.1 billion), inflation-protected securities — TIPS, counting the inflation-compensation the dataset files under accrued interest ($97.0 billion) — and floating-rate notes ($22.1 billion). Read against the same ten months of the prior two years, they split in two directions. Three rose: notes 17.8% year over year and 53.4% over two years; bonds 13.5% and 30.1%; TIPS 58.3% and 42.3%, the last driven almost entirely by its inflation-compensation line. Bills and floating-rate notes went the other way. Interest accrued on Treasury bills fell to $209.2 billion, from $227.4 billion a year earlier and $254.3 billion two years earlier — down 8.0% and 17.7%. Floating-rate notes fell to $22.1 billion, from $23.8 billion and $25.8 billion — down 7.2% and 14.3%. They are the only two of the five largest categories whose interest cost is lower than a year ago and lower than two years ago. They are also the two that reprice with short-term rates: bills are sold at a discount that tracks the current bill rate, and floating-rate notes reset off it.

The following is analysis, not fact. A gross interest bill climbing past $1.17 trillion for ten months reads as one force pushing one way. The composition says otherwise. The total keeps rising because the largest pieces keep growing: fixed-coupon notes and bonds issued in the higher-rate years since 2022 lock in their coupons for the life of the security and the stock of them keeps building, while TIPS climbs on accrued inflation compensation rather than any rate reset. The short, floating end reprices in weeks, so when short-term rates ease, its cost falls almost at once. That is the pattern only the full ledger surfaces: the government got cheaper money on exactly one part of its debt — the part that turns over fastest — while the fixed-rate bulk it financed at higher yields grinds the total upward. The relief sits where the debt is shortest and smallest; bills and FRNs together are about a quarter of the marketable interest bill, and it is absent where the bill is largest. We report the direction, not a decomposition. Interest on bills depends on both the rate they carry and how many are outstanding, and this series alone cannot separate a rate effect from a change in issuance — a lower bill total is consistent with lower short-term rates but not proof of them ^sspeculative. External trackers of the same period reach a compatible read — a larger debt stock and high long-term rates pushing costs up, lower short-term rates giving "some relief" — a framing we note but did not independently test.

The strongest caution is the one just made: a falling bill total is not proof of falling bill rates. If the Treasury simply issued fewer bills this year, their interest would drop even at an unchanged rate — and this dataset carries no outstanding-balance or rate column to isolate the two. We scope the claim to the observed dollar change and label the rate explanation consistent-with, not established. Second, "gross" matters. This is the Treasury's gross interest expense on the public debt; it does not net out the interest the government pays itself through trust funds, so it runs above the roughly $963 billion in net interest that budget trackers report for the same ten months. The direction of each category is unaffected, but the two measures are not level-comparable. Third, this is a ten-month fiscal-year-to-date snapshot through July 31, 2026, not a full year — a heavy or light final quarter of bill issuance could narrow or widen the split. And accrued interest is what the period owes, not cash paid; some of it (bill discount, note coupons) settles later.