Quick answer
Most HELOC rates reset monthly, tracking the Wall Street Journal Prime Rate plus your fixed margin. Prime moves when the Fed changes rates, which can happen at up to 8 scheduled FOMC meetings a year; if the Fed holds, your rate holds. Changes usually show up on your next billing cycle, within limits set by a lifetime cap (usually 18%) and any rate floor.
The mechanic in one paragraph
Your HELOC rate = Prime Rate + your fixed margin. Since September 16, 2026, Prime is 7.00%. A typical margin is 0.50%-1.50%, giving a rate of 7.5%-8.5%. When the Fed changes the federal funds rate, banks change Prime within hours. Your HELOC statement reflects the change on your next billing cycle.
2026 FOMC schedule and HELOC impact
| Meeting | Outcome | Prime rate after |
|---|---|---|
| Jan 27-28, 2026 | Hold | 6.75% |
| Mar 17-18, 2026 | Hold (11-1) | 6.75% |
| Apr 28-29, 2026 | Hold (8-4) | 6.75% |
| Jun 16-17, 2026 | Hold (unanimous) | 6.75% |
| Jul 28-29, 2026 | Hold (9-3) | 6.75% |
| Sep 15-16, 2026 | Raise 0.25% (12-0) | 7.00% |
| Oct 27-28, 2026 | Scheduled | TBD |
| Dec 8-9, 2026 | Scheduled | TBD |
Five holds in a row through July 2026, then a 0.25% increase in September, the first move since the Fed cut 75 bps across three second-half 2025 meetings. See what the September increase means for HELOCs.
How the reset actually works on your statement
Most lenders use one of two patterns:
- Calendar-month reset (most banks): Rate = Prime on the last business day of the prior month + your margin. Applies to the whole month.
- Billing-cycle reset (some credit unions, fintechs): Rate = Prime on your billing cycle date + your margin. Applies until the next cycle.
Check your HELOC agreement for the exact language — search "index adjustment date" or "rate change date."
What a 25 bp Fed change means to your monthly payment
| Drawn balance | 25 bp change (monthly) | 50 bp change (monthly) |
|---|---|---|
| $25,000 | $5 | $10 |
| $50,000 | $10 | $21 |
| $100,000 | $21 | $42 |
| $200,000 | $42 | $83 |
Individually small — but compounded over a 10-year draw period with multiple rate cycles, it adds up.
Rate caps that limit how much your rate can move
Every HELOC agreement includes:
- Lifetime cap: maximum rate over the entire loan life. Federal law requires this — usually 18% for HELOCs. Some states have lower caps.
- Periodic cap: some HELOCs have a per-adjustment cap (rate can't move more than X per period). Less common than on ARMs but exists.
- Rate floor: minimum rate. Prevents the rate from going below a certain level even if Prime crashes. Common floor is your starting rate — so a HELOC opened at 7.43% may never go below 7.43% even if Prime drops significantly.
Rate floors matter more than most borrowers realize. Read your HELOC agreement carefully.
Protection strategies against rate hikes
- Accelerate paydown: fewer dollars at risk when rate moves. Most effective for balances you can pay off within 3-5 years.
- Convert to fixed home equity loan: rate is locked. Higher rate than variable HELOC (~65 bp premium currently) but stable.
- Fixed-rate lock feature: some HELOC lenders, mostly larger banks, let you convert a portion of your balance to a fixed rate mid-draw. Usually 3-5 conversions allowed per year, small fee ($50-$100 each).
- Cash-out refi: replace the HELOC entirely with a fixed first mortgage. Only makes sense if your existing first mortgage rate isn't materially lower.
- Do nothing: if you have a small balance and stable income, riding out variable rate risk is often the right call.
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