Most HELOCs use a variable rate built from a public index—commonly the U.S. prime rate—plus or minus a lender-specific margin. Your final offer depends on both market rates and your application.
Index plus margin
If the index changes, the HELOC rate generally changes by the same amount. The margin is set by the lender and can reflect credit, CLTV, property, occupancy, documentation and line size.
APR, introductory rates and fees
A promotional rate may last only months. Compare the post-introductory formula, annual fee, origination or closing costs, minimum draw, inactivity fee and early-closure charge.
Rate floors, caps and fixed-rate locks
A floor can prevent the rate from falling below a minimum; periodic or lifetime caps limit increases. Some lines let you convert selected draws to fixed-payment segments.
How to improve your offer
Lower CLTV, stronger credit, stable documented income and fewer monthly debts can improve options. Compare offers with the same requested line and assumptions.
Frequently asked questions
Questions homeowners ask
Why do HELOC rates change?
Most are tied to a changing benchmark. When the index moves, the rate and payment can move.
Is the lowest advertised rate guaranteed?
No. Advertised pricing commonly assumes specific credit, CLTV, line size or relationship requirements.
Can I lock a HELOC rate?
Some programs permit fixed-rate conversions on drawn balances, often with separate terms or fees.