Two mortgage forecasters, $177 billion apart on 2027

Two mortgage forecasters marked down their books. Fannie Mae's cut surfaced first, in Scotsman Guide on 17 September. The Mortgage Bankers Association's forecast, dated 16 September, was published on the 21st; National Mortgage News and HousingWire carried both cuts together that morning.

Behind both: the Federal Open Market Committee raised the federal funds target range a quarter point to 3.75%-4.00% on 16 September. Unanimous, the first increase since 2023, and a statement saying inflation remains elevated.

The number

The association now forecasts $2.101 trillion of single-family originations in 2027, down from $2.144 trillion a month earlier. A $43 billion cut in four weeks.

HousingWire made the sharper point on 21 September: that 2027 figure sits below the association's own 2026 figure of $2.123 trillion. It expects a smaller market next year than this one.

The 2026 line came down $24 billion, from $2.147 trillion. Against August, refinancing took $13 billion of that, $713 billion down to $700 billion, and purchases took $11 billion, $1.434 trillion down to $1.423 trillion. The refinance line has been sliding longer: $747 billion in July, $760 billion in January. These are forecast revisions, not counted volume.

Two houses, about $177 billion apart

Fannie Mae cut 2026 to $2.121 trillion from $2.168 trillion. Its 2027 number is $2.278 trillion in National Mortgage News and Scotsman Guide; HousingWire prints $2.279 trillion. The association says 2027 contracts. Fannie Mae says it expands. About $177 billion apart.

They differ on the Fed too, over different windows. The association expects two more increases over the coming year. Fannie Mae expects one more in 2026, with the funds rate averaging 4.0% in the fourth quarter and 4.1% through 2027.

Two clocks, two mechanisms

Prime could not move until the vote. The mortgage market did not wait for it. Mike Fratantoni, the association's chief economist, said longer-term rates including mortgage rates had already priced in hikes at this meeting and future ones.

Prime is the fast clock. KeyCorp raised its prime rate to 7.00% from 6.75% right after the decision (Reuters, 16 September), and prime generally follows the funds rate across the banks. Loans priced off prime reprice on their own, usually at the next billing cycle or reset date. No new paperwork and no notice. On a $250,000 line drawn in full, a quarter point is $625 a year; on $1 million drawn, $2,500. Undrawn balance does not carry it. If the association's two further increases arrive, prime reaches 7.50% and those figures roughly triple.

The mortgage is the slow clock, on a different index. A 30-year fixed tracks the 10-year Treasury yield, not the Fed's overnight rate. That yield touched 5.01% on 14 September, its first time above 5% since October 2023, and was back near 4.96% on 22 September. Higher mortgage rates mean fewer purchases and thinner refinancing; few borrowers swap a cheaper old loan for a dearer one. That is the core of the cuts, though both also trimmed existing-home sales and housing starts.

What a year of rate drift costs a buyer here

Freddie Mac's weekly survey put the 30-year fixed at 6.95% on 17 September, up 19 basis points in one week, against 6.26% the same week a year earlier.

On a $500,000 loan that is $3,309.74 a month against $3,081.84: $227.90 more a month, $2,735 a year, $82,044 over 30 years, for the identical house. The single week's move accounts for $63.42 of it. At $400,000 the year's gap is $182.32 a month. Ocean County's median sale price has run in the high $400,000s this year and Lakewood's in the low-to-mid $400,000s, per Redfin.

One trap. Freddie Mac says 6.95%; the association's own application survey says 7.32% for the same week, different loan mix, points treated differently. On $500,000 that 37 basis point spread is about $125 a month. Two benchmarks, one week, both correct.

What is scheduled

Thursday 24 September: Freddie Mac's next weekly survey, which supersedes the 6.95% above.

Mid-October: the association's next monthly forecast. Its rate line has been lifted twice across three forecasts, 6.5% to 6.7% to 6.8%.

Wednesday 28 October, 2:00 p.m. Eastern: the FOMC decision. Futures pricing reported by HousingWire on 22 September put a further quarter point at 53%, which would take prime to 7.25%.

Late October: third-quarter results from the large independent lenders. PennyMac closed $16.6 billion across July and August, about 28% a month below its second quarter (HousingWire).