How HELOC Rates Work
HELOC rates are variable and tied to the prime rate. Understanding how your rate is set helps you shop effectively and budget for rate changes over time.
Your HELOC Rate Formula
Prime Rate
Variable
Your Margin
Fixed
HELOC APR
Changes Monthly
Rate Components Explained
Prime Rate
The prime rate is the benchmark lending rate set by major US banks, typically 3 percentage points above the federal funds rate target. When the Fed raises or lowers rates, the prime rate follows immediately. This is the index most HELOCs use.
Lender Margin
The margin is the fixed percentage the lender adds to the prime rate. It is set when you open your HELOC and does not change. A better credit score and lower LTV ratio typically earn a lower margin.
HELOC APR
Your actual rate is prime plus margin. Unlike a fixed-rate loan, this changes whenever prime changes. Most lenders recalculate your payment at the start of each billing cycle based on the current rate.
Rate Caps
Federal law requires all HELOCs to have a lifetime rate cap - the maximum rate can never go above 18% APR. Some lenders add a periodic cap limiting how much the rate can change per year. Read your agreement to know your specific caps.
Introductory Rate
Some lenders offer a promotional fixed rate for the first 6 to 12 months, then convert to the variable rate. These teaser rates can appear lower but the long-term rate is what matters for your total cost.
What Affects Your HELOC Rate
| Factor | Impact on Rate | Detail |
|---|---|---|
| Credit Score | Highest | Scores above 760 typically earn the lowest margins. Below 680 may mean higher margins or denial. |
| LTV Ratio | High | Lower LTV (more equity) means less lender risk and often a lower margin. |
| Loan Amount | Medium | Larger credit lines sometimes attract slightly better rates due to per-loan profitability. |
| Relationship Discount | Low to Medium | Having checking or savings accounts with the lender often earns 0.25-0.50% off the margin. |
| Debt-to-Income | Qualifying factor | High DTI may not increase your rate but can prevent approval altogether. |
How to Get the Best HELOC Rate
Improve your credit score first
Spending 6 to 12 months raising your score above 760 can reduce your margin by 0.5 to 1.0 percentage points, saving thousands over the life of a HELOC.
Shop at least 3 lenders
Margins vary significantly between lenders. Online lenders, credit unions, and your primary bank may all quote different spreads. Compare the APR, not just the rate.
Reduce your LTV ratio before applying
Making a few extra mortgage payments before applying lowers your LTV, which often qualifies you for a lower margin with most lenders.
Ask about relationship discounts
Moving your checking account to a lender before applying often earns 0.25% off the margin. This small discount is worth asking about when shopping.