What is a HELOC introductory or teaser rate?
When you shop for a HELOC, you may notice that some lenders advertise a low rate for an initial period before the “regular” rate kicks in. That promotional rate is commonly called an introductory rate or teaser rate.
The appeal is real: paying a lower rate in the early months can reduce your interest costs while you are in the draw phase. But the rate is temporary, and what happens after the introductory period ends matters just as much as the headline number.
How does the reset work?
HELOC rates are almost always variable, indexed to a benchmark — most commonly the prime rate as published in the Wall Street Journal. A lender adds a fixed margin on top of that index to arrive at your ongoing rate.
During the introductory period, a lender may:
- Charge a flat discounted rate (for example, prime minus a set percentage), or
- Offer a fixed low rate that bears no relationship to current market levels.
Once the introductory period expires, the rate resets to the standard formula: index + margin. If prime has moved during the teaser period, your new rate will reflect wherever prime sits at the time of reset — not where it was when you opened the line.
What to compare when you see a teaser offer
Not all introductory offers are equally attractive. Use this checklist before comparing lenders side by side:
| What to check | Why it matters |
|---|---|
| Length of intro period | A 3-month teaser saves less than a 12-month one at the same rate. |
| Intro rate level | A rate of, say, 2% for 3 months may cost more overall than a rate of 5% for 12 months, depending on your balance. |
| Post-intro index + margin | This determines your actual ongoing cost. A low teaser followed by a high margin is not a bargain. |
| Rate floor | A floor sets the minimum rate regardless of how low the index falls. This limits your upside if rates drop. |
| Rate cap | A periodic cap limits how much the rate can rise per adjustment period; a lifetime cap limits the total increase over the life of the line. |
| APR | Federal law requires lenders to disclose the APR, which factors in fees. Compare APRs — not just the teaser rate — across lenders. |
When can a teaser rate make sense?
A short-term introductory rate can be genuinely useful if you plan to draw funds and pay down a meaningful portion of the balance during the promotional period. In that scenario, you benefit from the lower rate at exactly the moment your balance is highest.
A teaser rate is less useful if you plan to draw slowly and carry a large balance after the introductory period ends. In that case, the post-intro margin and ongoing variable rate are the numbers that will determine most of your interest cost over time.
What the fine print often contains
Before signing, review the loan agreement for these items:
- Exact reset date — Is it a set calendar date or a number of months from the first draw?
- Index definition — Which version of the prime rate does the lender use, and how often does it update?
- Margin — Margins can range widely across lenders. A lower margin means a lower ongoing rate at any given prime level.
- Floor clause — Some lenders specify that the rate cannot fall below a certain level, even if the index does.
- Minimum draw requirements — Some introductory offers require you to draw a minimum amount at closing to qualify for the promotional rate.
- Prepayment or early-closure fees — Closing the line within a specified period (often 2 to 3 years) can trigger a fee that offsets your introductory-rate savings.
How to evaluate total cost, not just the intro rate
A straightforward way to compare two HELOC offers with different teaser structures is to estimate total interest over the first 24 months using a simple assumption about your average balance. For example:
- Offer A: 4% for 6 months, then prime + 0.75%
- Offer B: 6% for 12 months, then prime + 0.25%
If prime is at a given level, Offer B could cost less over 24 months despite the higher teaser rate, because the lower ongoing margin applies for 18 months after the teaser ends. The math shifts based on your balance and how long you plan to hold the line.
Running this exercise with realistic balance assumptions — rather than focusing only on the advertised introductory rate — gives you a clearer picture of which offer is more competitive for your situation.
Questions to ask lenders directly
When you receive a HELOC disclosure or loan estimate, consider asking:
- What is the margin that will apply after the introductory period?
- Is there a rate floor, and if so, what is it?
- Does the introductory rate require a minimum initial draw?
- Are there fees if I close the line within the first few years?
Lenders are required to provide the Truth in Lending Act (TILA) disclosure, which includes the index, margin, and caps. Reading that document carefully — not just the marketing materials — is the most reliable way to understand what you are agreeing to.