Say you have equity in the home you live in and want to use it for your first rental’s down payment. A home equity line of credit, or HELOC, lets you borrow against that equity. It also adds a second loan payment to the deal, on a rate that can move, and that payment belongs in your numbers.
Can you use a HELOC for a down payment on a rental property?
Yes. Fannie Mae’s Selling Guide says money borrowed against something you own is an acceptable source for “the down payment, closing costs, and reserves,” and it lists real estate among the assets that can secure it.
The next rule is the catch. The lender “must consider monthly payments for secured loans as a debt” when it works out how much you can borrow. If your line doesn’t require a monthly payment, the lender has to calculate an equivalent amount and count that instead.
The other catch is your house. The Consumer Financial Protection Bureau’s HELOC explainer says that if you fall behind or can’t repay on schedule, “you could lose your home.”
What does a HELOC payment do to a rental’s cash flow?
It comes right out of it. Take the house the rental calculator opens with: $250,000, bought with 20% down on a 30-year loan at 7%, renting for $2,750. After its mortgage and running costs, it keeps $420 a month. Now say the $50,000 down payment came from a HELOC at 8.5%, and you pay only the interest while the line is open for borrowing.
| While you can draw | Repaying over 20 years | |
|---|---|---|
| Rental cash flow after its mortgage | +$420 | +$420 |
| HELOC payment on $50,000 at 8.5% | −$354 | −$434 |
| What you keep each month | +$66 | −$14 |
These are example figures, not a quote. The 8.5% rate and the interest-only payments are this example’s assumptions, and your line’s terms will differ.
Sixty-six dollars a month leaves little room. The calculator already sets aside 5% of the rent for empty weeks, but a whole extra month without a tenant means $2,750 of rent that never comes in, more than three years of what this house keeps.
Why does a Fed rate hike hit a HELOC faster than a mortgage?
Because a HELOC’s rate usually floats and a fixed mortgage’s doesn’t. The CFPB says HELOCs “usually have a variable interest rate, so your payments may change from month to month.” The Federal Reserve says changes in its benchmark rate are rapidly reflected in floating-rate loans, including “many personal and commercial credit lines.”
On September 16, 2026, the Fed raised that rate by a quarter point. If a line’s rate rises by the same amount, from 8.25% to 8.5% in this example, the interest on $50,000 goes from $344 to $354 a month. That’s about $10 more a month, or $125 a year, and it takes this rental from keeping $76 to keeping $66.
A quarter point is small, but a variable rate can keep moving for as long as you carry the balance. At 9.5%, the interest would be $396 a month, and this rental would keep $24.
What happens when the draw period ends?
Your payment can jump. A HELOC has a “draw period” when you can borrow, and the CFPB gives 10 years as an example. After it ends you enter the “repayment period,” and the lender may set a schedule to repay the full balance, “often over ten or 20 years.” The CFPB warns that monthly payments “are often significantly higher” then, and that in some cases the whole amount is due as soon as repayment begins.
In this example:
- Repaid over 20 years at 8.5%, the payment is $434 a month and the rental loses $14 a month. It would need about $2,768 in rent to break even, instead of $2,750.
- Repaid over 10 years, the payment is $620 and the rental loses $200 a month.
- Ten years of interest-only payments at 8.5% add up to $42,500, and the full $50,000 is still owed when repayment starts.
Why does a rental look better when you borrow the down payment?
Because the return is measured against your own cash, and a HELOC shrinks that number. Here, your own money is only the $7,500 of closing costs. Leave the HELOC payment out and $420 a month is a 67% yearly return on $7,500. Put the payment in and it’s 10.6%, on a house that keeps $66 a month.
The rental calculator doesn’t know where your down payment came from, so it counts all $57,500 as your cash and shows 8.8% before any HELOC payment. To see the monthly picture, type the HELOC payment into the HOA box under Operating expenses, a fixed monthly cost the calculator subtracts the same way. With $354 there, the cash flow reads $66, and the “What breaks it” box shows the rent the deal now depends on: $2,664 a month.
What should you ask before you borrow against your home?
The CFPB’s explainer points to the terms that change the math:
- How long is the draw period, and how is the balance repaid after it?
- How is the minimum payment set? Many lines base it on your current balance.
- Can you convert some of the balance to a fixed rate? Some lines allow it, and the CFPB says the fixed rate “is usually higher” but more predictable.
- What fees apply, and do you have to borrow or keep a minimum amount?
Then put the payment into your rental’s numbers, at the line’s current rate and a point higher, before you count on the deal. If you’re still adding up the cash a rental takes beyond the down payment, start with this breakdown. For what each quarter point does to the rental’s own loan, see how interest rates affect a rental property.