What is the Treasury quarterly refunding announcement?

The quarterly refunding is the Treasury Department's announcement, made each February, May, August, and November, of how much new debt it will sell over the next three months and across which maturities. It sets the size of 2-, 3-, 5-, 7-, 10-, 20-, and 30-year coupon auctions, along with TIPS and FRNs, and signals any change to the bill-vs-coupon mix or buyback program. The May 6, 2026 statement is the Q2 refunding.

Why does refunding affect mortgage rates?

30-year fixed mortgage rates are priced off the 10-year Treasury yield plus a spread (currently around 2.1 percentage points). When Treasury announces larger long-end coupon auctions, the bond market has to absorb more duration supply, which pushes the 10-year yield up and mortgage rates with it. Smaller-than-expected long-end sizes or an expanded buyback program tend to pull yields down. The move can be 10-20 basis points in a single session.

What should I watch in the May 6 refunding statement?

Three things. First, whether Treasury keeps coupon auction sizes unchanged for a fifth straight quarter (the recent guidance) or finally raises them to fund a wider deficit. Second, the share of issuance going to bills versus coupons; a heavier bill mix is friendlier to long-end yields. Third, the buyback program: any expansion of off-the-run buybacks supports liquidity and tends to compress yields modestly.

How much does a 10bp move in the 10-year cost on a mortgage?

On a $400,000 30-year fixed loan, every 10 basis points (0.10 percentage points) on the rate is roughly $26 per month, or about $9,400 over the life of the loan. A 20bp move is roughly $52 per month and $18,800 lifetime. That is why a single refunding statement can matter more to a borrower in escrow this week than the Fed's next meeting in June.

Should I lock my mortgage rate before the refunding announcement?

If you are within 30 days of closing and current pricing fits your budget, locking before a known event-risk date is the lower-stress choice. Refunding can move rates either direction, so floating into the announcement is a coin flip with real money on the line. If you are 45-60 days out and have float-down protection, the calculus shifts toward floating, especially if you believe the bias is toward smaller long-end sizes.

Is the mortgage-Treasury spread coming down in 2026?

Slowly. The spread averaged about 1.7 percentage points in the 2010s, blew out to 3pp in late 2022 on rate-volatility and prepayment fears, and has compressed to roughly 2.1pp in 2026. It would take a sustained drop in interest-rate volatility (the MOVE index) and a return of bank demand for Agency MBS to push the spread back toward 1.7pp. Until then, even a 4.0% 10-year would translate to a 6.0%+ mortgage rate.

Treasury's May 6 Refunding: Why It Moves Your Mortgage

What is the quarterly refunding?

Four times a year, the Treasury Department tells the bond market how much debt it plans to sell over the next three months and at which maturities. The statement covers:

Coupon auction sizes for 2-, 3-, 5-, 7-, 10-, 20-, and 30-year notes and bonds.
TIPS and FRN sizes across the curve.
Bill-vs-coupon mix. Treasury can fund any given deficit dollar with a 4-week bill or a 30-year bond; the mix materially shifts the duration the market has to absorb.
Buyback operations. Treasury repurchases off-the-run securities to support liquidity. Expanding buybacks tends to support long-end yields.

Since mid-2024, Treasury has guided that coupon sizes would stay steady "for at least the next several quarters." Each refunding is therefore as much about the next-quarter guidance as the immediate auction sizes.

Why does this matter for mortgage rates?

30-year fixed mortgage rates are priced off the 10-year Treasury yield plus a spread, which currently sits at roughly 2.1 percentage points. The math:

30-year mortgage rate ≈ 10-year Treasury yield + spread

6.40% ≈ 4.39% + 2.01%

When refunding announces larger long-end coupon auctions, dealers have to absorb more duration. They demand higher yields to do so, and the 10-year sells off. Mortgage rates follow within hours. Smaller sizes or an expanded buyback program work in the opposite direction.

The October 2023 refunding is the textbook example: a smaller-than- feared long-end size pulled the 10-year down 18 basis points the same day. Mortgage rates dropped roughly the same amount over the next 48 hours. That single statement mattered more to lock-or-float decisions than the FOMC meeting that same week.

What every 10bp move costs you

The cleanest way to feel refunding risk is in dollars per month on a real loan. Here is the impact of a 10bp and 20bp shift starting from a 6.40% base, 30-year fixed, principal and interest only:

Loan amount	6.40% (base)	6.30% (-10bp)	6.50% (+10bp)	6.60% (+20bp)
$300,000	$1,876	$1,857	$1,896	$1,915
$400,000	$2,502	$2,476	$2,528	$2,553
$500,000	$3,127	$3,095	$3,160	$3,192
$600,000	$3,753	$3,714	$3,792	$3,830

30-year fixed, P&I only. Confirm with the Mortgage Calculator.

On a $400,000 loan, a 20bp adverse move costs $51 a month and roughly $18,400 over the life of the loan. That is the kind of amount a refunding statement can move on its own.

What to watch in the May 6 statement

1. Coupon auction sizes

The base case heading in was for steady sizes for a fifth consecutive quarter. Any uplift to 10-, 20-, or 30-year sizes would be a hawkish surprise for long-end yields. With the 2025 deficit running near 6% of GDP, the market has been on watch for Treasury to finally signal a coupon-size increase later in 2026.

2. Bill-vs-coupon mix

Bills currently make up about 22% of total marketable debt, above the Treasury Borrowing Advisory Committee's long-recommended 15-20% range. A statement that explicitly aims to bring the bill share back toward 20% means more coupon issuance ahead, and is modestly bearish for the 10-year. A statement comfortable with the current mix is friendlier to long-end yields.

3. Buyback program

Treasury launched regular off-the-run buybacks in 2024. The May 6 statement is a chance to expand operation sizes or add new buckets (cash-management buybacks, for example). Any expansion supports liquidity in older issues and modestly compresses long-end yields.

4. The TBAC charge questions

Treasury publishes the questions it asked the Treasury Borrowing Advisory Committee. Those questions are a signal of what Treasury is thinking about for the next two-to-four quarters: stablecoin reserve demand, foreign holdings, regular buyback sizing. The charge is often a better leading indicator than the auction sizes themselves.

Lock-or-float math for buyers in escrow this week

If you are within 30 days of closing on a home purchase or refinance, the question is straightforward: is the current rate workable, and what is the cost of being wrong?

Days to close	Suggested action	Why
0-15	Lock	Not enough time to recover from an adverse 20bp move.
16-30	Lock if rate fits budget	Float-down protection is usually paper-thin this close to funding.
31-45	Float with float-down	Pays off if refunding is friendly; capped downside if it isn't.
46-60+	Float	Plenty of time for a rate cycle. Lock at the next 6.20% print or below.

On a $400,000 loan, a single 10bp adverse move outweighs the cost of most lock extensions, which run $50-150. The cost of being wrong on float is typically 5-10x the cost of being wrong on lock for borrowers near closing.

Why the spread is the bigger story

The 10-year is at 4.39%. In a normal 1.7pp spread environment that would mean a 30-year mortgage at 6.09%, not 6.40%. The 30bp difference is pure spread.

Two things have to happen for the spread to compress back to its 2010s average:

Lower interest-rate volatility. The MOVE index (Treasury vol) has eased from its 2022-2023 peaks but remains elevated. Mortgage investors price prepayment uncertainty into the spread; less Treasury vol means less prepayment vol.
Return of bank demand for Agency MBS. Banks were the marginal buyer of MBS in 2020-2021, retreated through the 2023 regional-bank stress, and have been slow to come back. Stablecoin and money-market growth has absorbed the front end instead.

Until those two normalize, refunding will keep being the swing factor that matters most for week-to-week mortgage pricing.

Price your loan at multiple rates

Our Mortgage Calculator models monthly P&I, total interest, and amortization at any rate and term. Pair it with the Loan EMI Calculator to compare 15- vs 30-year scenarios side-by-side before locking.

Frequently asked questions

What is the Treasury quarterly refunding?

Treasury's February, May, August, and November statements setting coupon auction sizes, bill-vs-coupon mix, and buyback operations for the next three months.

Why does refunding move mortgage rates?

Mortgage rates are priced off the 10-year Treasury plus a spread. Larger long-end auction sizes mean more duration to absorb, which pushes the 10-year up and mortgages with it.

What should I watch on May 6?

Whether coupon sizes hold for a fifth quarter, the bill share of total debt, and any expansion of the buyback program. Read the TBAC charge questions for the next-quarter signal.

How much does a 10bp move cost me?

About $26 a month on a $400,000 30-year loan, or roughly $9,400 lifetime. A 20bp move is double that.

Should I lock or float?

If you are 30 days or fewer from closing and the current rate fits, lock. If you are 45-60+ days out with float-down protection, floating is reasonable. The asymmetry favors locking near closing.

Data sources: U.S. Treasury Quarterly Refunding; Federal Reserve H.15 Selected Interest Rates; Freddie Mac Primary Mortgage Market Survey; Bankrate Mortgage Rates. Mortgage payments verified using the accurate.software Mortgage Calculator.