The mechanic in one paragraph
Your HELOC rate = Prime Rate + your fixed margin. In July 2026, Prime is 6.75%. A typical margin is 0.50%-1.50%, giving a rate of 7.25%-8.25%. 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 | [Upcoming — track post-meeting] | TBD |
| Sep 15-16, 2026 | Scheduled | TBD |
| Nov 3-4, 2026 | Scheduled | TBD |
| Dec 15-16, 2026 | Scheduled | TBD |
Six holds in a row through June 2026. The Fed cut 75 bps across three second-half 2025 meetings and hasn't moved since.
How the reset actually works on your statement
Most lenders use one of two patterns:
- Calendar-month reset (BofA, 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 (US Bank, PNC, TD Bank) 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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