Construction Loan Interest Reserves Were Sized for Rate Cuts. The Fed Decides Wednesday.

Construction Loan Interest Reserves Were Sized for Rate Cuts. The Fed Decides Wednesday.

An interest reserve is the line in a construction loan budget that pays your interest during the build. It gets sized once, at closing, off an assumed rate and an assumed schedule. If either one moves against you, the reserve empties before the building is finished, and the gap lands at the worst possible moment: after the money is spent, before there is any income.

Most reserves funded in the last two years were sized on the quiet assumption that rates would drift down. That assumption gets tested on Wednesday.

The Fed's own vote changed direction in July

At the July 29 meeting the Committee held the target range at 3-1/2 to 3-3/4 percent on a 9 to 3 vote. The three dissenters, Beth Hammack, Neel Kashkari and Lorie Logan, were not pushing for a cut. They wanted a quarter-point increase. The statement is blunt about why: inflation "remains elevated relative to the Committee's 2 percent goal," and "the Committee will deliver price stability."

The data since has pushed the same way. Producer prices ran hot on Thursday, August CPI came in at 3.4 percent year over year on Friday morning, and the market repriced quickly.

> CME FedWatch odds of a quarter-point hike at the September 16 meeting moved from 48.4 percent on August 11 to 85.6 percent on the morning of September 11.

The 10-year Treasury closed at 4.83 percent on September 9. SOFR, the index most construction loans float on, sat at 3.64 percent the same day. Those are the numbers your reserve is now being spent against.

Banks are easing on finished buildings, not on new ones

The Fed's July survey of senior loan officers, covering the second quarter, is worth reading before you ask anyone for a construction loan. Banks reported easing standards on loans secured by nonresidential and multifamily property. Standards on construction and land development loans did not move at all.

Then the survey asked banks where their standards sit relative to the full range they have run since 2005. Construction and land development was the one commercial real estate category where a significant net share of banks placed themselves at the tighter end. It was also the only category where banks reported weaker demand.

Put those together and the picture is specific. Credit is loosening for buying a finished building and sitting still for building a new one.

What a shortfall actually costs

The mechanic is arithmetic, and the FDIC wrote it down years ago: average outstanding balance, times the interest rate, times the expected construction period. On an adjustable-rate loan, the regulator says, the lender "factors the potential for rate changes into the interest reserve calculation." In practice, plenty do not.

Take a $2,500,000 loan, an 18-month build, an average outstanding balance of 55 percent, priced at SOFR plus 350. At the September 9 SOFR print that is about 7.14 percent, and a reserve of roughly $147,000 carries the term. Move the rate up 100 basis points and the monthly burn rises to about $9,300. The same $147,000 now covers a little under 16 months.

You are two months short, and they are the last two months, when the building is nearly done, the contractor still wants paying, and there is no certificate of occupancy yet.

There is a second-order problem the FDIC primer names directly. A loan with a bank-funded reserve stays current while the reserve lasts, because the bank is paying itself. The usual early warning, a late payment, never fires. Both sides find out at the same time, and it is late.

The check to run this week

Pull the loan agreement and find three things: the index and the margin, how often the rate resets, and who funds a reserve shortfall. On most bank paper that last one is the borrower, out of pocket, on demand.

Then rerun the reserve 150 basis points above your closing assumption. If the project only works at the rate you signed at, it was never a construction budget. It was a rate bet with a building attached.

Sources

Federal Reserve. FOMC statement, July 29, 2026, holding the target range at 3-1/2 to 3-3/4 percent on a 9 to 3 vote, with three dissents preferring a quarter-point increase: https://www.federalreserve.gov/newsevents/pressreleases/monetary20260729a.htm

Federal Reserve. July 2026 Senior Loan Officer Opinion Survey on Bank Lending Practices, covering the second quarter of 2026: https://www.federalreserve.gov/data/sloos/sloos-202607.htm

FDIC Supervisory Insights. A Primer on the Use of Interest Reserves, the regulator's description of how reserves are calculated and how they can mask distress: https://www.fdic.gov/regulations/examinations/supervisory/insights/sisum08/sisummer08-article3.pdf

FRED, Federal Reserve Bank of St. Louis. Secured Overnight Financing Rate, 3.64 percent on September 9, 2026: https://fred.stlouisfed.org/series/SOFR

FRED, Federal Reserve Bank of St. Louis. 10-Year Treasury Constant Maturity, 4.83 percent on September 9, 2026: https://fred.stlouisfed.org/series/DGS10

24/7 Wall St. CME FedWatch hike odds at 85.6 percent for the September 16 meeting, published September 11, 2026: https://247wallst.com/investing/2026/09/11/with-just-5-days-to-next-fomc-meeting-odds-of-fed-rate-hike-surge-to-over-85/

Rates and odds are as of September 11, 2026 and move daily. This is general information, not legal, tax or investment advice.