The federal debt closed August at $40,175,641,071,634.14, up $404.02 billion from the July 31 close, according to the Treasury Department’s Debt to the Penny series. That is the largest single-month increase of fiscal 2026 and the first month-end close above $40 trillion on record. The debt first crossed $40 trillion on August 18 and has not closed below that line on any of the nine business days since. August edged past October 2025, which had held the fiscal-year record at $402.54 billion, by $1.48 billion. Borrowing ran at an average of $13.03 billion a day across the month, and settlement flows on August 31 alone added $71.54 billion. With one month left in fiscal 2026, the government has added $2.54 trillion since the fiscal year opened on September 30, 2025 at $37.64 trillion. The pace matters to households because Treasury closes that gap by selling securities into a market already demanding more yield, and those yields anchor mortgage rates, auto loans and deposit returns. The prime rate has held at 6.75% since the Federal Reserve’s July 28-29 decision, and policymakers return to the table at the September 15-16 FOMC meeting with the 10-year Treasury yield at its highest close of 2026.
- Federal debt closed August at $40.18 trillion, up $404.02 billion from July 31.
- That is the largest month of fiscal 2026, beating October 2025 by $1.48 billion.
- It is also the first month-end close above $40 trillion. The line was crossed August 18.
- Public holders own $32.42 trillion, or 80.68% of the total. Federal trust funds hold the rest.
- Prime holds at 6.75% into the September 15-16 FOMC meeting.
What Changed: A $404 Billion August
Treasury publishes the total public debt outstanding every business day in a series called Debt to the Penny. The July 31 entry read $39,771,617,162,466.97. The August 31 entry read $40,175,641,071,634.14. The difference, $404,023,909,167.17, is the largest gap between two consecutive month-end closes in fiscal 2026, and the first time the later figure carries a four followed by eleven zeros’ worth of trillions. October 2025 had held the fiscal-year record since autumn at $402.54 billion, a month inflated by the start-of-year borrowing surge that follows every September 30 fiscal turn. August beat it by $1.48 billion without that seasonal tailwind, which is what makes the print notable rather than routine.
The composition of the increase is conventional. Debt held by the public, the portion sold into markets to investors, pension funds, foreign central banks and the Federal Reserve, stood at $32.42 trillion on August 31, or 80.68% of the total. Intragovernmental holdings, the balances the Social Security and Medicare trust funds are credited with, stood at $7.76 trillion, or 19.32%. Those shares have barely moved all year, which tells you the growth is coming from cash borrowing rather than from an accounting shift inside the trust funds. Every dollar of that public share had to find a buyer at auction, at whatever yield the auction cleared.
Inside the Month: How Treasury Reached $40.18 Trillion
The month did not climb in a straight line. The debt opened August at $39.74 trillion on the third, ground higher through the first two weeks, and cleared $40 trillion for the first time on August 18 at $40,047,425,768,420.22. It then slipped back to $40.01 trillion on the nineteenth without breaching the line, and spent the rest of the month grinding upward. The single largest daily move came at the very end. Between the August 28 close of $40,104,097,482,666.58 and the August 31 close, the total rose $71.54 billion in one settlement day, a jump that reflects the standard month-end and quarter-adjacent settlement of notes auctioned the previous week rather than any new policy decision.
Those settlements were priced at the top of the year’s yield range. Treasury sold seven-year notes at 4.512% on August 27, the highest yield that maturity has drawn since December 2024, on a bid-to-cover ratio of 2.50. Five-year notes went at 4.393% the day before. Both settled August 31, which is why the closing balance jumped when it did. On September 1, Treasury followed with $52 billion of 52-week bills and $85 billion of six-week bills, both settling September 3. The running national debt total updates each business day as those settlements clear.
What the New Debt Costs to Carry
The average interest rate across all interest-bearing federal debt was 3.447% as of July 31, the most recent monthly reading Treasury has published. That average has been climbing steadily because the securities maturing today were issued when money was cheap, and their replacements are not. Treasury bills, which mature within a year of issue and therefore reprice fastest, totaled $6.99 trillion at the end of July, about 17.6% of all federal debt and 22.2% of the marketable portion. That balance turns over continuously, so today’s yields feed into the government’s actual cash interest bill within months rather than decades.
Yields moved against Treasury during the month. The 10-year Treasury yield closed August 31 at 4.75%, its highest close of 2026. The five-year closed at 4.49%, a level last seen in January 2025. The two-year finished at 4.34% and the 30-year at 5.25%. Measured against second-quarter output of $32.48 trillion, the August 31 debt works out to roughly 123.7% of gross domestic product, a ratio tracked in detail on our debt to GDP page. The compounding arithmetic of a rising balance meeting a rising average rate is laid out on our interest on the national debt tracker.
What Changes for Your Money
Nothing changed on your statement this morning. The prime rate is set at 3 percentage points above the upper bound of the federal funds target range, and the Federal Reserve left that range at 3.50% to 3.75% on July 29. Prime therefore stays at 6.75%, exactly where the Fed’s H.15 release has carried it every business day through August 31. Variable-rate credit cards and home equity lines that price off prime are unchanged, and they will stay unchanged until the Fed itself moves at the September 15-16 meeting or later.
Longer-dated borrowing is a different story, because it prices off Treasury yields rather than off prime. A 10-year yield at its 2026 high pulls 30-year mortgage rates up with it, and it does so before any Fed decision. The same force works in savers’ favor. Banks and credit unions competing for deposits against a 4.49% five-year Treasury have to pay more, which is why certificate of deposit yields and high-yield savings rates have held up through the summer. Fixed personal loan rates sit in between, repricing on a lag as lenders reset their funding assumptions.
If you are shopping for a fixed-rate product, watch the five-year Treasury rather than the fed funds rate. Bank CD pricing and auto loan pricing track intermediate Treasury yields far more closely than they track prime, and the five-year just reached a 19-month high. Lenders reprice deposit specials on a two to four week lag, so a rate you see advertised today usually reflects where yields sat in early August. Locking a CD term before the September 15-16 FOMC meeting removes the guesswork about which way the committee moves.
Frequently Asked Questions
How much is the U.S. national debt right now?
The total federal debt stood at $40,175,641,071,634.14 at the close of business on August 31, 2026, according to the Treasury Department’s Debt to the Penny series. That is roughly $40.18 trillion. The figure rose $404.02 billion during August, the largest one-month increase of fiscal 2026, and it is the first month-end reading ever recorded above $40 trillion. Treasury updates the number every business day, usually in the afternoon, so the live figure runs one business day behind the current date. The debt first closed above $40 trillion on August 18.
How much U.S. debt is coming due in 2026?
Treasury bills, every one of which matures within a year of issue, totaled $6.99 trillion at the end of July. That is about 17.6% of the total federal debt and 22.2% of the marketable portion. All of it has to be refinanced within twelve months, on top of the notes and bonds reaching maturity on their own schedules. Treasury handles the rollover continuously rather than in one event. On September 1 alone it sold $52 billion of 52-week bills and $85 billion of six-week bills, both settling September 3.
Does a bigger national debt raise the interest rate on my loan?
Indirectly, and unevenly. Heavier Treasury issuance means more supply hitting the bond market, and buyers generally demand a higher yield to absorb it. Those yields set the benchmark for 30-year mortgages, auto loans and student loans. Products tied to the prime rate, including most variable credit cards and home equity lines, work differently. They follow the Federal Reserve’s policy decisions, not Treasury’s borrowing schedule. So an August like this one can push your mortgage quote higher while leaving your credit card APR untouched.
What does a $404 billion month mean for the September Fed meeting?
Directly, very little. The Federal Open Market Committee sets the federal funds target range against its inflation and employment mandates, and fiscal borrowing is not one of its policy levers. The indirect channel runs through the bond market. Heavy issuance that pushes long yields higher tightens financial conditions on its own, which some committee members read as work the market has already done for them. The committee meets September 15-16 with the target range at 3.50% to 3.75% and prime at 6.75%.
Is the national debt the same thing as the deficit?
No. The deficit is the shortfall in a single period, the gap between what the government collects and what it spends. The debt is the accumulated total of every past shortfall, plus the interest owed on it. The two do not match month to month, because the debt figure also moves with cash management decisions, trust fund crediting and the timing of auction settlements. That is why a $71.54 billion single-day jump on August 31 reflects settlement timing rather than $71.54 billion of new spending on that date.
What should I do about my own borrowing costs right now?
Split the decision by product type. Anything priced off prime is frozen until the Fed moves, so paying down variable-rate balances is about your own interest cost rather than about timing the market. Anything priced off Treasury yields is already at or near a 2026 high, which cuts both ways. Borrowers locking a fixed rate today are locking near the top of the range. Savers opening a CD today are locking near the top as well. The September 15-16 meeting is the next scheduled catalyst for either side.
Watching the September Calendar
Fiscal 2026 ends September 30, and Treasury needs one more month of data before the year’s borrowing total is final. The August Monthly Treasury Statement, the September auction slate and the FOMC decision all land inside the next three weeks. Daily readings continue on our national debt tracker, with the policy side covered on the prime rate dashboard and the outlook on our 2026 Fed rate forecast.
References
- U.S. Department of the Treasury, Fiscal Data, Debt to the Penny. Daily closes for August 2026, retrieved September 2, 2026.
- U.S. Department of the Treasury, Fiscal Data, Monthly Statement of the Public Debt. Securities outstanding as of July 31, 2026.
- U.S. Department of the Treasury, Fiscal Data, Average Interest Rates on U.S. Treasury Securities. Total interest-bearing debt, July 31, 2026.
- Board of Governors of the Federal Reserve System, H.15 Selected Interest Rates. Bank prime loan rate and effective federal funds rate through August 31, 2026.
- Board of Governors of the Federal Reserve System, FOMC Meeting Calendars. 2026 meeting schedule.
- TreasuryDirect, Auction Query. Results for the August 26, August 27 and September 1, 2026 auctions.
- Federal Reserve Bank of St. Louis, FRED, Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity. Series DGS10, DGS5, DGS2 and DGS30.
- U.S. Bureau of Economic Analysis, Gross Domestic Product. Second quarter 2026 advance estimate.
