First-lien HELOC: using a line of credit in place of your mortgage

7 min read · LenderMatch Learn

A first-lien HELOC is a home equity line of credit that sits in first position on your home, usually because it pays off your mortgage at closing and takes its place. Instead of a loan with a fixed payment schedule, you have a revolving line: you can draw, repay and draw again during the draw period, often paying interest only, then repay what is left over a set term. It can fit a borrower with large, steady cash balances; for most homeowners, the variable rate and the end of the draw period make it riskier than a fixed mortgage.

Below: how a first-lien HELOC works, a side-by-side with a regular mortgage on a $200,000 balance, who it can fit, the risks and the alternatives. If you are weighing one against a refinance or a regular HELOC, comparing lender offers shows the margin and fees you would actually get.

What is a first-lien HELOC?

Lien position is the order in which lenders get paid if a home is sold to settle its debts. Your mortgage is normally first. A regular HELOC sits behind it in second position (our guide is a HELOC a second mortgage? explains why that matters).

A first-lien HELOC flips that. Experian describes it as a HELOC that combines your existing mortgage with a traditional HELOC: the line pays off your mortgage and becomes the only loan on the home. Its example is a $500,000 home with $200,000 owed. A $300,000 first-lien line pays off the $200,000 balance at closing and leaves $100,000 available to draw.

A HELOC on a home with no mortgage is also in first position, since it is the only lien. This article is about the other case: using a line of credit in place of a mortgage you have now.

How a first-lien HELOC works

• Draw period. Typically up to 10 years, according to Experian. You can borrow up to your limit, and you may be allowed to pay interest only.
• Repayment period. Draws stop and you repay principal and interest, usually over 20 years.
• Interest. Charged on the balance you carry, and Experian notes it accrues daily. Every dollar you pay in lowers the next day’s interest, and you can draw it back out later.
• Rate. Usually variable: an index such as the prime rate plus a margin. See how a variable-rate HELOC works.

One credit union’s first-lien line shows typical terms: a 10-year draw period with interest-only payments, a 20-year repayment period, a $50,000 minimum line, up to 90% loan-to-value, a 640 minimum FICO score, and a prime-based rate with a 4.95% floor and an 18.00% maximum APR (accessed October 27, 2026).

First-lien HELOC vs mortgage

Worked example: a $200,000 balance

Say your home is worth $400,000 and you owe $200,000 at 6.75% with 25 years left. Your principal and interest payment is $1,381.82. A lender offers a first-lien HELOC with a $320,000 limit (80% of value) at 7.50%: the prime rate of 7.00% (Federal Reserve H.15, as of October 21, 2026) plus an example margin of 0.50 point. The line pays off the mortgage, so you start with a $200,000 balance.

The HELOC column assumes the rate stays at 7.50% and you pay the same $1,382 a month during the draw period; interest figured monthly for simplicity. Closing costs not included. Calculated by LenderMatch. Illustrations, not quotes.

• The lower payment comes from skipping principal, not from a lower rate. The line’s rate is 0.75 point higher, which costs about $1,500 more interest in year one.
• The line has to earn that back. Cash you keep in the line instead of a checking account lowers the balance that day. To make up a 0.75-point gap on $200,000 at 7.50%, you would need about $20,000 sitting in the line all year, every year.
• Rate moves cut both ways. If prime rose 1 point, the interest-only payment would go from $1,250 to about $1,417. If it fell 1 point, the line would charge less than the mortgage.

Who a first-lien HELOC can fit

• High, steady cash balances. Someone who keeps tens of thousands in savings or business cash flow and is willing to park it in the line.
• A mortgage rate at or above today’s HELOC rates. Experian notes the product may suit borrowers with a high-interest first mortgage.
• A plan to pay off the home fast. With no fixed schedule during the draw, the payoff speed is up to you.
• Strong credit and equity. Experian cites a typical 680 minimum score, debt-to-income limits of 35% to 45%, and loan-to-value of 85% or lower, varying by lender.

First-lien HELOC risks

• The rate is variable. The CFPB says HELOCs usually have a variable rate, so your payments may change from month to month. Your whole home debt now carries that risk, not just a small second line.
• The line can be frozen or reduced. Under Regulation Z, a lender may stop new draws or cut the limit if your home’s value falls significantly or it reasonably believes a material change in your finances means you can’t repay. If you have parked your savings in the line, that money may not be available when you need it.
• The draw period ends. The CFPB says payments are often significantly higher once you enter repayment. In the example, an interest-only payment of $1,250 becomes $1,611 if nothing was paid down.
• You can lose your home. “If you fall behind or can’t repay the loan on schedule, you could lose your home,” the CFPB says.
• Costs. Experian puts closing costs at roughly 2% to 5% of the amount borrowed. On $200,000 that is $4,000 to $10,000, before any annual fee.

First-lien HELOC vs velocity banking

A first-lien HELOC is a loan product. Velocity banking is a payoff strategy that runs your paychecks and lump-sum “chunks” through a HELOC, usually a second-lien line next to your mortgage. The two come up together because a first-lien line lets you route income straight against your whole home balance. The math is the same either way: the savings come mostly from extra money paid toward the debt, and the HELOC rate compared with your mortgage rate decides whether the line helps. Our velocity banking guide runs those numbers.

Alternatives to a first-lien HELOC

• Keep your mortgage and add a regular HELOC. Your fixed rate stays on the big balance and only new borrowing is variable. The blended rate calculator shows the combined rate.
• Refinance. Freddie Mac’s 30-year fixed averaged 7.32% the week of October 22, 2026; on $200,000 that is $1,374 a month, fixed for 30 years. The refinance calculator finds your break-even.
• Pay extra principal on your mortgage. It shortens the loan without a new rate or fees, though you can’t draw the money back out.

Frequently asked questions

Is a first-lien HELOC a good idea?

It can be for a borrower with steady income, large cash balances that can sit in the line, and the discipline to pay principal without being required to. For most people it adds risk: the rate is variable, the line can be frozen, and payments rise when the draw period ends. In our example it cost about $92,600 more in interest than keeping the mortgage.

What credit score do you need for a first-lien HELOC?

It depends on the lender. Experian says a typical minimum is 680, and one credit union’s first-lien line lists 640. Lenders also look at your income, debts and how much of the home’s value you borrow against.

Does a first-lien HELOC have closing costs?

Usually. Experian puts closing costs at roughly 2% to 5% of the amount borrowed, and fees vary by lender. Ask for an itemized list, plus any annual fee or early closure fee.

What happens when a first-lien HELOC’s draw period ends?

You can no longer borrow, and the balance is repaid with principal and interest, often over 20 years. If you paid interest only, the payment can jump: $200,000 at 7.50% goes from $1,250 a month interest-only to $1,611 over 20 years.

Is a HELOC on a paid-off house a first-lien HELOC?

Yes. With no mortgage on the home, the HELOC is the only lien, so it sits in first position. See borrowing against a paid-off house.

Compare HELOC offers from several lenders →