Mischler Cash Flash
Money Market & Front-End Liquidity · Quick Take
Drive Interest Expense higher, as Fed hikes, steeper curve break to new highs.
FY2027 Gross Bill supply may need to grow by $1.04 trillion, $550-675 billion of it for private investors net of Fed purchases. Refinancing pandemic-era 5s and 7s will push the average rate on Treasury debt to about 3.8% - 3.9% vs. 3.50% currently as Fed delivers another 50bps of hikes.
Our monthly cash model puts FY2027 net bill issuance at about $1 trillion. Interest expense to rises about $88 billion as low-coupon notes roll with a deficit of about $1.86 trillion, up from $1.67 trillion in FY26. Treasury's cash-balance assumptions ($850 billion at year-end, $950 billion next September) and about $185-$190 billion of liquidity-support buybacks. . Fed will need to takes a larger share, after RMP paused through November, but will have to get back to $20 billion a month after, plus $15 billion MBS reinvestment, investors will have to absorb about $650-$700 billion, a range of $475 to $850 billion depending on RMPs and MBS prepayments. Bills reach about $8 trillion, 23.9% of marketable debt, against the TBAC's 20% recommended target.
Interest expense will continue to add to the pressure. if we can hold rates stable or lower (3-month 4.25%, 2-year 4.80%, 10-year 5.15%, 30-year 5.50%). Average rate on Treasury debt, 3.49% will climb to 3.80% by next summer. Annualized gross interest moves from $1.40 trillion to about $1.625 trillion, and FY27 gross interest expense of $1.57 trillion, up from roughly $1.37 trillion in FY26.
Maturing coupons of $3.18 trillion of notes and bonds maturing over the next 12 months. Average coupon is 2.96%, against about ~ 5.00% at current levels, adding $66 billion a year. Maturing 5-year notes (2.17%) and 7-year notes (0.96%) total $1.26 trillion, 40% of the maturities, and would add $43 billion of the $66 billion in interest expenses. $1.63 trillion of 2- and 3-year notes add only ~$16 billion. Additional interest cost gets pushed into 2028: with 0.375% to 0.5% 7-years maturing May through Sept 2027, only about $33 billion of the interest expense gets added in FY27 but the rest will be felt in 2028.
Market and FOMC expecting more hikes. Market pricing ~75bp by next Sept, an implied effective rate near 4.58%. About $8.7 trillion of bills and FRNs resets within a few months (Bill average maturity ~ 67 days), so each 25bp is worth about $22 billion a year. 2027 interest rises another $32 billion to about $1.60 trillion, headed to $1.68 trillion pace by the end of Sept 2027, and average rate about 3.93%. Bessent's bill-heavy financing mix means Fed hikes reach the Treasury's interest bill by year-end and higher into 2027.
| +$1 Trillion2027 net bills ~ $650bn including Fed buys | 3.81-3.93%Avg rate Sep-27 vs 3.49% now | $1.575-1.60TFY27 gross interest, given curve and FOMC | +$22bnAnnual cost per 25bp hike |
Month by Month: About $1 Trillion of New Bills
Bills fill the gap in the big spending months and wait for Tax receipts.
Bills Head to $8.3 Trillion
Gross bills peak near $8.3 trillion in August 2027, 23.9% of marketable debt. Net of the Fed portfolio Bill supply to grow by $660 billion; (shading shows RMPs from zero to $40 billion a month).
Pandemic-Era 5s and 7s Drive the Refinancing Bill
Maturing 5- and 7-year notes are 40% of the refi about two-thirds of the $66 billion annual refinancing cost. 2- and 3-year will roll without adding much to the bill. 1996-97 30-year bonds are maturing at 6.50% actually may save money, unless we continue on our current pace.
Interest Expense: About $1.57 Trillion in FY27
2026 interest expense ~$1.37 trillion. Given the curve, 2027 will climb to $1.57 trillion and the average rate about 3.80-85%. If the market proves right and Fed hikes ~ 75bps, 2027 may break $1.60 trillion and push our average cost to ~ 3.90-95%.
$224 Billion Comes From
Refinancing debt at market levels adds about $100 billion a year, as much as all the new borrowing. Even with no deficit funding, the interest bill would still rise by about $100 billion. Implied hikes adds another $50-55 billion.
Where the Interest Goes: Money Funds Recycle It Into Bills
Interest Expense ends up being another one Revenues. It's higher return may end back in bill and repo demand. Money funds held $3.8 trillion of Treasuries directly at the end of August ($2.88 trillion of bills, $526 billion of floaters, $422 billion of coupons), 95% of it in government and Treasury funds. Given today's curve, it should be generated about $157 billion a year incoming, roughly $13 billion a month, or about 11% of Treasury's gross interest bill. Government funds reinvest that income in bills, repo and agencies, so it lands back in the front end.
At about $9.25 trillion and a net yield near 3.8%, reinvested dividends add roughly $29 billion a month, $88 billion a quarter and $351 billion a year. Government and Treasury funds account for about $23 billion a month, $69 billion a quarter and $275 billion a year. If the hikes the market prices are delivered, the annual pace rises toward $410 billion. That is close to what the bill market needs.
Money funds own about 43% of the bills the Fed does not hold, keeping consistent share of 2027's $662 billion of net supply means taking about $285 billion, almost exactly the organic growth of government funds. Reinvested yield alone keeps money funds' share of bills steady; any new cash lets them take more. Higher rates speed the loop: Treasury pays more interest, part of it lands in money funds, and it comes back as
bill demand.
Bottom Line
Can the market handle the new Supply; Interest Cost is becoming real burden.
Money funds, Stablecoin and the Fed will have to absorb about $1 trillion of new bills. The interest expense adding roughly $200-225 billion more a year will increasingly be a burden and weight to carry. The Fed maybe a swing factor with each 25bp hike is worth ~ $20-25 billion a year, and the current market pricing adding about $55-60 billion next year, a bill that will continue higher into 2028 without a rally or Fed cuts.
Sources: U.S. Treasury (Daily Treasury Statement through 9/24/26, Monthly Statement of the Public Debt incl. CUSIP-level detail as of 8/31/26, auction results, average interest rates, daily par yield curve 9/25/26, Treasury presentation to TBAC August 2026), Federal Reserve, Bloomberg Finance L.P., BofA Global Research (7/31/26) and Barclays (monthly bill forecasts), Mischler Financial Group calculations. Scenario, not a forecast: curve held at 9/25/26 levels unless noted, nominal coupon, TIPS and FRN auction sizes unchanged, FY27 bills from the Mischler monthly cash model (receipts and non-interest outlays +5.8%, TGA $850bn Dec / $950bn Sep, buybacks $16bn/month, RMP paused Oct-Nov then $20bn/month, MBS reinvestment $15bn/month), trust-fund (GAS) balances and rates held flat. Hike case: bill and FRN rates follow the fed funds futures path (Bloomberg WIRP, 9/15/26) as the bill stock rolls; coupon yields stay at 9/25 levels. Interest is gross interest on the public debt, which includes interest paid to federal trust funds; net interest in the federal budget is lower (FY26 through July: $963bn net vs $1,170bn gross).
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