Deficit hits $1.99 trillion for fiscal 2026 as net interest tops $1.05 trillion

The federal government closed fiscal 2026 on September 30 with a deficit of $1.992 trillion, up from $1.775 trillion a year earlier, according to Treasury's Monthly Treasury Statement. That is a 12.2% increase. CNBC and Bloomberg both led with the headline figure. The line items underneath it say more about where the pressure is coming from.

The gap widened because spending outran revenue

Source: Treasury Monthly Treasury Statement, September 2026, tables 1, 4 and 9. Percentages are our arithmetic on Treasury's figures.

The number behind the headline: tariffs

Tariffs were sold partly as a revenue source, so the customs line is worth reading closely. Gross customs receipts for the year were $317.8 billion, but the net figure Treasury books is $173.2 billion, a gap of $144.6 billion, and it is lower than last year's $194.9 billion. CNBC, citing a Treasury official, reported record gross duties but said refunds required after this year's Supreme Court ruling against many of the tariffs sent billions back to importers. We have not seen Treasury break out the refund total itself, so we will not put a number on it beyond the gap in its own tables.

Corporate tax receipts fell about $71 billion, which CNBC attributed to the tax cuts in last year's budget law. Individual income taxes rose $190 billion and carried most of the revenue growth.

Interest is now the story

Net interest cost $1.052 trillion, which works out to roughly $2.9 billion a day and 19.5% of all receipts. A year ago the equivalent figure was 18.5%. The bill rises because the debt is larger and because the Treasury keeps refinancing at higher yields. The 10-year yield sat at 5.19% on our markets board this afternoon, after the highs we covered in our 10-year yield report. September itself showed a $27 billion monthly deficit, compared with a $198 billion surplus in September 2025, according to Treasury's monthly table.

Who it actually hits

A deficit this size means heavy, continuous Treasury issuance, and that supply is one of the forces holding long yields high. Mortgage and commercial real estate rates take their cue from those yields. Freddie Mac's 30-year rate is 7.4% on our board.

• A contractor with a floating-rate line: floating rates track the Fed's policy rate, not the 10-year, so the deficit reaches this borrower indirectly. If the Fed turns toward a hike, as some analysts now argue, each added point costs $2,500 a year on a $250,000 balance.
• A landlord or owner-operator refinancing a building: pricing is tied to longer Treasury yields. A loan resetting this winter will price off a 10-year near 5.2%, not the levels of the last few years.
• An importer: the net customs figure shows the tariff regime is still in legal and administrative flux. Duties paid and refunds due can both change a cash forecast, so keep the paperwork on every entry.

Nothing in the statement changes next week's Fed decision on its own. The next scheduled policy decision is October 28, and the next jobs report is November 6. For now the practical point is that the deficit is not shrinking, interest is the fastest-growing large line, and long-term borrowing costs are unlikely to get relief from Washington.

Sources: U.S. Treasury Fiscal Data; CNBC; Bloomberg. This is market information, not investment advice.