How Does a HELOC's Variable Rate Move With Prime and the Fed?
A HELOC's rate is usually the prime rate plus a margin the lender sets when you open the line. The margin stays put. Prime moves, and it moves with the Federal Reserve: when the Fed raises or cuts its federal funds rate target, prime follows, and so does your HELOC rate. Nothing about your credit or your home has to change for your payment to go up or down.
Last updated September 29, 2026Why is a HELOC's rate variable?
A HELOC is a revolving line of credit against your home, unlike a home equity loan, which pays out a lump sum. Its rate has two parts: an index, most often the prime rate, and a margin the lender adds based on things like your credit and how much of your equity you're borrowing against. The margin is set at the start and usually stays the same for the life of the line. The index doesn't, so the total rate rises and falls.
How is the prime rate tied to the Fed?
Prime is a benchmark banks use to price loans. It's conventionally set at about 3 percentage points above the federal funds rate, the rate banks charge each other for overnight loans, though it can vary a little by bank. When the Fed changes its target, prime usually follows within a short time, and any HELOC balance tied to prime adjusts with it.
Can any part of a HELOC rate be fixed?
It depends on your situation:
- A standard HELOC balance: the whole balance floats with the index. Only the margin is fixed.
- Your lender offers a fixed-rate conversion: many HELOCs let you lock all or part of what you've borrowed at a fixed rate for a set term, while the rest of the line keeps floating.
- You want a fixed rate from day one: a home equity loan is built that way from the start.
| Rate structure | Index (usually prime) plus a margin set by the lender |
|---|---|
| What moves | The index, which follows the Fed's federal funds rate |
| What stays fixed | The margin, set when you open the line |
| Prime rate | About the federal funds rate plus 3 percentage points |
| Fixed-rate options | A conversion feature on part or all of the balance, or a separate home equity loan |
Related questions
- HELOC vs home equity loan vs cash-out refinance
- is there a prepayment penalty if I pay off my mortgage, HELOC, or home equity loan early
- can I get a cash-out refinance or HELOC on an investment, rental, or non-primary property
- how long do I have to wait before taking cash out (seasoning periods)
- what determines your mortgage rate quote
Sources
- https://www.consumerfinance.gov/ask-cfpb/what-is-a-home-equity-line-of-credit-heloc-en-107
- https://www.consumerfinance.gov/ask-cfpb/what-is-the-difference-between-a-home-equity-loan-and-a-home-equity-line-of-credit-heloc-en-247
- https://www.consumerfinance.gov/ask-cfpb/for-an-adjustable-rate-mortgage-arm-what-are-the-index-and-margin-and-how-do-they-work-en-1949
- https://www.investopedia.com/terms/p/primerate.asp
- https://www.bankofamerica.com/home-equity/fixed-rate-loan
- https://www.bankrate.com/home-equity/heloc-with-fixed-rate-option
Sourced from licensed loan officers and brokers in the FreeRateUpdate network.
Educational information only, not individualized financial or legal advice. Program details and rates change; verify current terms with a licensed loan officer before making a decision.