The average interest rate the U.S. government pays on its interest-bearing debt rose to 3.353 percent at the end of May, according to Treasury Fiscal Data published in early June. That reading is the highest since October 2025 and marks the fourth consecutive monthly increase, after the average bottomed at 3.316 percent in January. The move is small in any single month, roughly one basis point, but the direction matters because it is multiplied across a debt pile that reached 39.23 trillion dollars on June 4. The 10-year Treasury yield sat at 4.47 percent on June 4 and the 30-year bond at 4.97 percent, both far above the sub-2 percent coupons attached to much of the debt issued during the pandemic era. The timing is pointed: the Treasury heads into a heavy week of 3-year, 10-year, and 30-year coupon auctions, and every dollar of new issuance settles at a rate near the top of the past decade. For households, the same yield backdrop that lifts the government’s costs also keeps the current prime rate pinned at 6.75 percent and shapes what you pay on loans. Here is what the latest national debt data shows and why it is climbing.
Key Takeaways
- The average rate on interest-bearing federal debt rose to 3.353 percent in May, the highest since October 2025.
- It was the fourth straight monthly increase, up from a January low of 3.316 percent and 3.294 percent a year earlier.
- Total public debt reached 39.23 trillion dollars on June 4, so each basis point of average rate carries a large dollar cost.
- Maturing low-coupon debt is rolling into new issuance priced near 4 to 5 percent, lifting the blended rate.
- The prime rate held at 6.75 percent and a Fed hold is widely expected at the June 16-17 meeting.
What the May data shows
Treasury’s Average Interest Rates dataset put the rate on all interest-bearing debt at 3.353 percent as of May 31, up from 3.340 percent in April and 3.327 percent in March. The series had been drifting lower through the winter, reaching 3.316 percent in January, before reversing course each month this spring. The May figure is the highest since October 2025, when the average stood at 3.355 percent, and it is up from 3.294 percent in May of last year. Within the marketable categories, Treasury bills carried an average rate of 3.690 percent, notes 3.248 percent, and bonds 3.413 percent at month-end.
The dollar stakes scale with the size of the debt. Total public debt outstanding hit 39,232,150,577,284 dollars on June 4, with about 31.61 trillion dollars held by the public and 7.62 trillion dollars in intragovernmental accounts such as the Social Security and Medicare trust funds. At that scale, each basis point of average rate carries a large annual cost as the stock turns over. The Congressional Budget Office has projected that net interest will exceed 1 trillion dollars in fiscal 2026, a sum that now rivals major spending categories. The May uptick does not change that trajectory by itself, but it confirms that the realized cost of carrying the debt is rising again rather than easing.
Why the average rate keeps rising
The mechanism is refinancing, not new deficits alone. A large share of the debt was issued between 2020 and 2021, when the Treasury could sell notes and bonds at coupons well below 2 percent. Those securities are now maturing on a rolling basis, and the Treasury must replace them with fresh issuance priced at prevailing market yields. With the 2-year note yielding 4.05 percent, the 10-year at 4.47 percent, and the 30-year at 4.97 percent as of June 4, every maturing low-coupon security that rolls over lifts the blended average. The effect is gradual because only a slice of the debt matures in any given month, which is why the average moves in increments of a basis point or two rather than in jumps.
This is the feedback loop fiscal analysts watch most closely. Higher average rates raise interest outlays, wider deficits require more borrowing, and more borrowing means more securities sold into a market that sets the price. The Federal Reserve’s policy rate sits at a target range of 3.50 to 3.75 percent, which anchors the short end and keeps bill rates near 3.7 percent, but long-term yields are set by investors weighing growth, inflation, and the sheer supply of paper. So long as new and refinanced debt prices above the coupons it replaces, the average rate carries a built-in upward bias.
A heavy auction week meets higher yields
The refinancing dynamic plays out in real time at Treasury auctions. This week the Treasury runs its standard mid-month slate of coupon sales, offering 3-year notes, a 10-year note reopening, and a 30-year bond reopening, per the TreasuryDirect auction calendar. Those sales land just as yields sit near their highest levels in two weeks, with traders having lifted the odds of a Federal Reserve rate increase later in 2026 after the May jobs report showed payrolls rising by 172,000. Strong demand, measured by the bid-to-cover ratio and the share taken by indirect bidders, would hold yields steady and keep the government’s marginal borrowing cost contained. Weak demand, signaled by an auction that prices above the level trading before the sale, would push yields higher and feed directly into the average rate over coming months.
The 30-year bond is the figure to watch. At 4.97 percent it is the highest point on the curve and the most sensitive to concerns about long-run fiscal supply, since investors who buy it lock in three decades of exposure. A soft long-bond auction can ripple across the curve and into mortgage rates, which track the 10-year yield closely. With borrowing needs still heavy, that steady supply of new paper is the backdrop against which every auction is judged.
What higher debt costs mean for your rates
The government’s borrowing cost and your borrowing cost are driven by the same underlying yields. The prime rate, the benchmark most variable consumer products are indexed to, held at 6.75 percent through early June and moves only when the Fed changes its policy rate. With a hold widely expected at the June 16-17 meeting, variable credit card APRs and home equity lines should stay roughly where they are for now. You can track the benchmark on our current prime rate page and see lender pricing on the personal loan rates today tracker.
Longer-term borrowing follows the Treasury curve rather than prime. Because 30-year mortgages price off the 10-year yield, the firm 4.47 percent reading keeps home loans elevated; our current mortgage rates page shows where they stand today. The same high yields that strain the federal budget do reward savers: bill rates near 3.7 percent and competitive deposit accounts keep cash yields healthy, and our best high-yield savings accounts roundup tracks the top offers. The practical takeaway is that the debt-cost story and the household-rate story share one engine, the level of Treasury yields, so watching the curve tells you about both.
If you hold cash, the rising-rate backdrop is working for you. Lock part of an emergency fund into a Treasury bill or a competitive savings account while bill yields sit near 3.7 percent, and keep the rest liquid. If you carry variable-rate debt, treat the current prime rate of 6.75 percent as a ceiling that is unlikely to fall soon, and prioritize paying down the highest-APR balances rather than waiting for cuts that markets are no longer pricing for this summer.
Frequently asked questions
What is the average interest rate on the national debt right now?
Treasury Fiscal Data reported an average rate of 3.353 percent on all interest-bearing federal debt as of May 31, 2026. That is the highest reading since October 2025 and the fourth consecutive monthly increase, up from a January low of 3.316 percent. The average had been 3.294 percent a year earlier. Within the categories, bills averaged 3.690 percent, notes 3.248 percent, and bonds 3.413 percent. The figure is a weighted blend of every outstanding security, so it moves slowly even when current market yields swing more sharply, and it tends to lag the level at which new debt is actually being issued today.
Why is the average rate going up if the Fed is on hold?
The Fed sets short-term policy rates, but the average rate on the debt is driven mostly by refinancing. Securities issued at very low coupons during 2020 and 2021 are maturing and being replaced with new notes and bonds priced at today’s higher market yields, which range from about 4 percent at the 2-year point to nearly 5 percent at the 30-year. Each rollover lifts the blended average even without a Fed move. The policy rate matters at the short end, where bills reset quickly, but it is the long-term Treasury yields set by investors that determine how expensive the bulk of refinanced debt becomes.
How much is the United States paying in interest?
The Congressional Budget Office has projected that net interest on the federal debt will exceed 1 trillion dollars in fiscal 2026, a level that now rivals the largest single categories of federal spending. The exact figure depends on the path of yields and the pace of new borrowing, both of which remain elevated. With total public debt at 39.23 trillion dollars and the average rate climbing, interest costs are rising faster than the debt itself in percentage terms during months when the average rate increases.
Does the national debt affect my loan and credit card rates?
Indirectly, yes, through the level of Treasury yields. The government’s borrowing cost and consumer rates are both anchored to the same market. Variable products such as credit cards and home equity lines move with the prime rate, which sits at 6.75 percent and changes only when the Fed adjusts policy. Fixed products such as 30-year mortgages track the 10-year Treasury yield, currently around 4.47 percent. When heavy government borrowing or inflation concerns push Treasury yields up, fixed consumer borrowing tends to follow, while savers benefit as deposit and bill yields rise alongside the curve.
What are Treasury auctions and why do they matter this week?
Treasury auctions are how the government sells new debt to fund itself and refinance maturing securities. This week brings the standard mid-month slate of 3-year notes, a 10-year note reopening, and a 30-year bond reopening. Investors submit bids, and the auction sets the yield the government will pay. Analysts watch the bid-to-cover ratio, which compares total bids to the amount offered, and the share taken by indirect bidders, a proxy for foreign and institutional demand. Strong auctions keep yields contained and limit the rise in the government’s borrowing cost; weak auctions push yields higher and feed into the average rate over time.
Will the average rate on the debt keep rising?
It is likely to keep drifting higher as long as new and refinanced debt prices above the coupons it replaces. Much of the debt maturing in the coming months was issued at rates below 2 percent, while current market yields sit between roughly 4 and 5 percent, so each rollover adds to the blended cost. The trend would reverse only if Treasury yields fell back below the average run-off coupon, which would require either Fed rate cuts or a sustained market rally. With markets currently leaning against summer cuts after strong jobs data, the near-term path points to a gradual continued increase rather than a decline.
Watching the cost of the debt from here
The May data confirms a quiet but consequential shift: the realized cost of the national debt is climbing again, driven by the steady refinancing of cheap pandemic-era securities into a market that now prices Treasuries near 4 to 5 percent. This week’s auctions will offer the next read on demand, and the June 16-17 Fed meeting will set the tone for the short end. For ongoing tracking, follow the US debt dashboard, the US interest rates dashboard, and the Treasury yield curve as the picture develops through the summer.
References
- U.S. Department of the Treasury, Fiscal Data, Average Interest Rates on U.S. Treasury Securities. fiscaldata.treasury.gov
- U.S. Department of the Treasury, Fiscal Data, Debt to the Penny. fiscaldata.treasury.gov
- Federal Reserve Economic Data (FRED), 10-Year Treasury Constant Maturity Rate (DGS10). fred.stlouisfed.org
- Federal Reserve Economic Data (FRED), 30-Year Treasury Constant Maturity Rate (DGS30). fred.stlouisfed.org
- Federal Reserve Economic Data (FRED), Bank Prime Loan Rate (DPRIME). fred.stlouisfed.org
- Board of Governors of the Federal Reserve System, FOMC Meeting Calendars. federalreserve.gov
- TreasuryDirect, Upcoming Auctions. treasurydirect.gov
- Congressional Budget Office, The Budget and Economic Outlook. cbo.gov
