08/28/2026
Your HELOC rate can jump more than you think.
Not knowing the cap exposes you.
Fixed margins are not the full story.
A first-lien HELOC rate has two moving parts.
You start with a fixed margin.
But the real action comes from the SOFR index.
Most people ignore the variable piece until the bill hits.
Hereās what lenders donāt highlight enough:
- The lifetime cap is set: your rate can go up by as much as 6 percentage points above your starting rate.
- If you start at 7%, you could hit 13% down the road.
- SOFR changes trigger rate jumps.
- You cannot control SOFR.
Have you asked yourself if you can handle the payment if rates spike?
Stress-test your numbers.
- Use a worst-case rate, not todayās rate, in your spreadsheets.
- Calculate if you stay cash flow positive when rates jump.
- Make sure your emergency fund covers bigger payments.
- Look at your budget with the capped HELOC payment, not the teaser rate.
I ran these numbers before my last HELOC.
Rates looked low, but the cap told a different story.
Donāt ignore risk because the payment looks easy today.
Do you know the cap on your own HELOC?
Would your finances survive hitting it?