How the Treasury and Fed Manage the $40T+ National Debt

TL;DR: The Treasury borrows the money by auctioning bills, notes and bonds. The Federal Reserve does not manage the debt. It sets short-term interest policy, and its decisions change what that borrowing costs. With debt above $40 trillion, the split between those two jobs now shapes mortgage rates, private credit pricing and your own return hurdle.

According to The Conference Board, the U.S. has over $40 trillion of national debt, 123% of GDP, and now spends more each year on interest than on defense. A lot of investors assume the Fed runs that debt. It doesn't.

Who actually manages the national debt?

The Treasury does. The Conference Board's explainer notes that the Second Liberty Bond Act of 1917 gave the Treasury Secretary authority to determine the types of issues, terms and techniques to best manage the debt.

In practice that means auctions. The Bipartisan Policy Center lays out the menu: bills run four to 52 weeks, notes two to 10 years, and bonds 20 or 30 years. Treasury's own debt management overview adds that primary dealers must bid in every auction, a rule enforced by the Federal Reserve Bank of New York.

That's where the two institutions touch. The Fed's regional bank polices the dealers, but it doesn't decide how much Treasury borrows.

What does the Fed do, then?

The Fed sets the price of money. Its Federal Open Market Committee, according to the Federal Reserve, is a 12-person group that sets monetary policy at meetings held at least eight times a year. Its mandate, as Treasury Authority summarizes the statute, is maximum employment and stable prices.

The separation is deliberate. The same source points to the Treasury-Federal Reserve Accord of March 1951 as the event that established the modern split between monetary and fiscal policy. Treasury answers to elected officials who think in short budget cycles, while the Fed's governors serve 14-year terms so rate decisions sit outside election politics.

	Treasury	Federal Reserve
Main job on debt	Issues bills, notes and bonds at auction	Sets short-term rate policy through the FOMC
Who it answers to	Elected officials	Insulated by 14-year governor terms
Lever	How much it borrows and at what maturities	The policy rate
What you feel	Yields move when supply rises	Yields move when the policy rate moves

One institution cannot fix the other's problem. Treasury controls the volume of borrowing, the Fed controls the price signal, and neither controls what buyers will pay at auction.

Why does it matter to an accredited investor right now?

Because the bill is arriving. According to the Bipartisan Policy Center, nearly $1 of every $5 in federal revenue goes to interest on the debt, and net interest is now the second-largest government expenditure.

Markets are already repricing. Forbes contributor Garth Friesen reported that on October 7 the 10-year Treasury yield climbed above 5.35%, its highest since 2002, with the 30-year at 5.70%. He also reported that the FOMC raised its benchmark range to 3.75% to 4% on September 16, and that 30-year fixed mortgages reached 7.49%.

Trace it forward. Heavy Treasury supply and a higher policy rate push the risk-free yield up, and every private deal has to clear that bar. The Bipartisan Policy Center also cites an estimate that government borrowing crowds out private investment by about 33 cents per dollar.

Downside first. When a sponsor shows you a projected 9% return, ask what you give up versus a 5.35% Treasury with no lockup, because illiquidity is a cost and you should be paid for it. Projected numbers are marketing until a fund shows realized ones, and TVPI is a good example of a metric that flatters. I covered the leverage side of this in the 2026 BDC debt issuance wave, and the numbers in this look at the $2 trillion private credit market read differently once Treasuries yield this much.

What should you watch next?

Two things. The first is the next FOMC meeting, since the committee meets at least eight times a year and each one can move the policy rate. The second is auction sizes: Treasury's overview says issuance is meant to be regular and predictable rather than opportunistic, so I'd expect changes to arrive slowly.

One limit on what I know: the Conference Board's full report sits behind a sign-in, and I read only the excerpt available to me. The figures above come from that excerpt and the other linked sources.

Common mistakes

The classic error is crediting the Fed with debt policy. When yields spike, people blame the central bank, but Treasury's issuance and market demand are doing much of the work. Another is comparing a private deal's projected return to cash instead of to the Treasury yield for the same duration. And then there's treating one day's yield as a trend. A 24-year high tells you where rates are, not where they will be next quarter.

FAQ

Does the Federal Reserve manage the national debt? No. The Treasury issues and manages the debt through auctions. The Fed sets monetary policy through the FOMC, which affects borrowing costs but not how much the government borrows.

How big is the U.S. national debt? The Conference Board says it is over $40 trillion, which is 123% of GDP. The country now spends more each year on interest than on defense.

Why do Treasury yields affect my private investments? Treasuries set the risk-free benchmark. When a 10-year yield sits above 5.35%, a private deal has to pay you more for illiquidity and risk than it did when yields were lower.

Can the Fed and Treasury act together? Yes, in a crisis. Treasury Authority notes that Section 13(3) emergency lending needs Treasury approval, and in 2020 Congress appropriated $454 billion to Treasury to backstop Fed facilities.

What to do today

Pull up the projected return on the last private deal you looked at and compare it to the current 10-year Treasury yield. If the gap doesn't clearly pay you for the lockup and the sponsor risk, you have your answer. The free AIN briefing will keep sending you the rate and debt numbers that move that comparison.

Educational content only. Not investment, tax, or legal advice. Not an offer or solicitation to buy or sell securities. Past performance does not guarantee future results. Private-market investments are illiquid and involve risk of loss, including total loss of capital. Consult qualified advisers. Angel Investors Network is not a broker-dealer or investment adviser.