What the Fed Rate Hike Means for Your HELOC

A variable-rate HELOC charges the prime rate plus a margin fixed on the day the line opened, so when prime moves, the rate moves with it, point for point. The Federal Reserve's quarter-point increase on September 16th took prime from 6.75% to 7.00%. On a $60,000 balance at a typical margin, that adds $12.50 to the monthly interest bill.

That is a small number, and it is the right one to start from. The question homeowners are now asking is whether to lock the balance into a fixed rate before the next hike, and the answer turns on how many more $12.50 increments are coming. On the figures available, locking is close to a break-even bet on price. It is worth doing mainly for borrowers who will carry the balance for years and would rather not find out.

Prime is not set by the Fed, but it might as well be. Banks post it at 3 percentage points above the upper bound of the federal funds target range. The FOMC voted 12 to 0 to raise that range to 3.75% to 4.00%. Four plus three is seven, which is what the Fed's H.15 release records as the prime rate through September 24th.

The margin is the lender's part, set at closing on the strength of credit score, combined loan-to-value and line size. Per RefiGuide's breakdown, it stays fixed for the life of the line. RefiGuide put the average at about 0.68 points in July, when the national average HELOC rate was 7.43% against a prime of 6.75%.

Take a borrower at that average margin with $60,000 drawn. The rate goes from 7.43% to 7.68%. During the draw period, when payments are mostly interest, the monthly bill rises from about $371.50 to $384.00. RefiGuide's rule of thumb is $10.42 a month per $50,000 drawn for each quarter point, which scales to the same $12.50.

When the new rate reaches the statement depends on the line's adjustment terms. The sources do not standardize those, so the agreement is the place to check. Typical contracts cap increases at about 2 points a year and around 18% over the life of the line, so the ceiling sits a long way above today's rate.

In the surveys. HELOC rates recorded their "biggest jump of the year" one week after the hike, according to Bankrate. Its average on a $30,000 line rose 17 basis points to 7.28% as of September 23rd. That is an average across lenders. Any individual line indexed to prime moved the full 25.

In the forecasts. The Fed's September projections, as tallied by BondSavvy, have 12 of 19 participants expecting another quarter point by year end, to 4.00% to 4.25%. By the formula, that puts prime at 7.25% and the $60,000 borrower at about $396.50 a month. The 2027 median holds there. Four participants see cuts; the other 14 see rates flat or higher.

In the precedent. From 2022 to 2023, prime rose 525 basis points, from 3.25% to 8.50%. A borrower with $150,000 drawn paid about $656 more a month. Nobody is forecasting a repeat. The episode shows what "variable" means once the increments stop being small.

Homeowners who hear "the Fed raised rates" often assume their whole housing bill moved. It did not. An existing fixed mortgage is untouched. New mortgage rates follow the bond market, and they fell on 9 of the 11 days the Fed hiked during 2022 to 2023. Fixed home equity loans track the 10-year Treasury yield rather than prime.

The price of certainty is the gap between fixed and variable, and the two main surveys disagree on its size. Yahoo Finance's September 25th figures, for top-tier borrowers with a 780 score or better, put HELOCs at 7.09% and fixed home equity loans at 7.42%. Experian's figures, from Curinos data, show 7.53% against 7.69%. The gap is therefore 0.16 to 0.33 points. On $60,000, that is $8.00 to $16.50 a month in extra interest for the privilege of a fixed rate.

One more hike adds $12.50, which lands squarely inside that range. A single further increase roughly closes the gap, and a second puts the fixed borrower ahead. The median Fed projection calls for one.

The fixed payment will look much larger, but that is a different thing. A home equity loan repays principal from the first month. Experian's $50,000, 10-year example costs $598.48 a month at 7.69%. That figure is a repayment schedule, not a penalty.

The strongest objection is that the dot plot is not a promise. In March it projected cuts, and four participants still expect them in 2027. If rates fall, a borrower who locked in pays more than one who waited, possibly for years. That is true, and it is the nature of insurance. Locking is not a bet that rates will rise. It is a premium of roughly one hike, paid to avoid another 2022, and it is worth buying only by those who could not absorb one.

What the sources do not supply is closing costs. None quotes fees for a lender's fixed-rate conversion option or for refinancing a HELOC into a home equity loan. Any fee is paid up front. Dividing it by the expected monthly saving gives the number of months to break even.

Where the balance came from matters too. A line drawn to clear high-rate cards raises a separate question about paying off credit card debt. For the rate question itself, a borrower whose margin sits above the 0.68-point average has the most to gain from a fresh quote. That borrower is paying for a risk profile the lender set years ago.