Consumers in the market for a home have been patiently waiting for the Federal Reserve to cut interest rates — a move it seems poised to make in September.

But without action from Congress, there could be another change at the end of that month that makes it temporarily trickier to buy or sell a home in some areas, or to refinance an existing mortgage.

That’s because the National Flood Insurance Program — the government-sponsored public insurance program that is the largest flood insurer in the U.S. — needs to be reauthorized by Sept. 30 to continue to issue new policies or increase coverage on existing policies.