HELOC vs cash-out refinance for a Miami investment property down payment (2026)

Last updated: July 2026

If you own a Miami home with equity and want to fund the down payment on an investment property, a HELOC is usually the sharper tool than a cash-out refinance in the current rate environment, and the reason is arithmetic, not preference. A cash-out refinance replaces your entire first mortgage at today's pricing, which averaged 6.55 percent for a 30-year fixed the week of July 16, 2026 per Freddie Mac [1]. If your existing loan carries a rate from 2020 or 2021, refinancing means repricing every dollar you already owe just to reach the equity. A HELOC leaves that first mortgage untouched and adds a second-position line of credit against your home, priced off the prime rate, currently 6.75 percent [2], plus or minus a margin. You pay the higher variable rate only on what you draw. The tradeoffs cut the other way too: HELOC rates float, the collateral is your primary residence, and underwriters will count the new payment against you. Here is how each path works, how the tax treatment differs, and how lenders view borrowed down payments.

This article is general information, not financial, tax, or legal advice. Talk to a lender and a tax professional about your own numbers.

How each option actually works

HELOC: a second lien, drawn as needed

A home equity line of credit sits behind your existing first mortgage as a second lien. The bank approves a credit limit based on your home's value, your combined loan-to-value ratio, and your income. During the draw period, typically several years, you borrow what you need, when you need it, and pay interest only on the outstanding balance. Rates are variable and generally track the prime rate plus a margin set by the lender, so when prime moves, your rate moves with it [2].

For an investment purchase, the appeal is precision. If you need a down payment on a Brickell condo, you draw exactly that amount, and the rest of the line sits unused at zero cost. You can browse what that inventory looks like on our Brickell neighborhood page.

Cash-out refinance: one new, larger first mortgage

A cash-out refinance pays off your current first mortgage and replaces it with a larger loan, and you take the difference in cash at closing. You end up with one loan, one payment, and a fixed rate if you choose a fixed product. The catch in 2026 is the repricing problem. The whole balance, not just the cash you extract, moves to the new rate.

Why sub-4 percent first mortgages change the math

A large share of American homeowners locked in first mortgages below 4 percent during 2020 and 2021. For those owners, a cash-out refinance at current levels near 6.55 percent [1] means voluntarily giving up a below-market liability. The blended cost of keeping a low fixed first mortgage and layering a HELOC on top is usually far lower than the cost of repricing everything, even though the HELOC's own rate is higher than the refinance rate.

Run the comparison on blended cost, not on the sticker rate of each product. A HELOC at prime plus a margin can look expensive next to a 6.55 percent refinance until you account for the fact that the refinance applies that rate to your entire existing balance. The larger your existing balance and the lower its rate, the more the HELOC wins.

The calculus flips for owners whose current first mortgage is already at or above today's rates. If you bought or refinanced in 2023 through 2025 at 7 percent or higher, a cash-out refinance may reprice your debt sideways or even down while pulling equity, and the fixed rate removes the variable-rate risk that comes with a HELOC.

Tax treatment: the part most people get wrong

The interest rules here are specific, and they hinge on what the borrowed money is used for, not just what secures the loan.

Under IRS Publication 936, interest on home equity debt, including a HELOC or the cash-out portion of a refinance, is deductible as home mortgage interest only if the proceeds are used to buy, build, or substantially improve the home that secures the loan, subject to a $750,000 total acquisition debt limit for most loans originated after December 15, 2017 [3]. Pulling equity out of your primary residence to buy a different property does not meet that test, so the interest is not deductible as home mortgage interest on Schedule A.

That is not the end of the analysis. When borrowed funds are used to acquire a rental property, interest tracing rules can allow the interest to be treated as a rental expense against that property's income on Schedule E, based on how the proceeds were actually used [4]. The mechanics matter: commingling draws, or using one line for both personal and investment purposes, complicates the tracing. Keep the paper trail clean, document that the draw funded the purchase, and have a CPA who handles rental real estate structure it before you close, not after.

Risk framing: what you are actually signing up for

Neither path is free money, and both put your primary residence on the line in ways worth stating plainly.

Variable rate exposure. HELOC rates float with prime. Prime sits at 6.75 percent as of July 2026 [2], and it moves when the Federal Reserve moves. Underwrite your deal assuming the rate can rise, and know whether your lender offers a fixed-rate lock option on drawn balances.
Your home is the collateral. Both a HELOC and a cash-out refinance are secured by your primary residence. If the investment property underperforms and you cannot service the debt, the exposure lands on the home you live in, not the one you bought.
Payment shock at the end of the draw period. Many HELOCs convert from interest-only to fully amortizing repayment. Model that future payment now.
Closing costs and break-even. Cash-out refinances carry meaningful closing costs on the full new loan amount. A HELOC is typically cheaper to open but carries rate uncertainty. Compare total cost over your expected hold period.

How underwriters count a borrowed down payment

A common misconception is that a down payment must be your own idle cash. Lenders distinguish between unsecured borrowing, which is generally not acceptable, and borrowing secured by an asset you own, which generally is.

Conventional financing

Under Fannie Mae's Selling Guide, borrowed funds secured by an asset, which includes real estate you own, are an acceptable source of funds for a down payment [5]. The key mechanics: a loan secured by real estate, such as a HELOC on your primary home, must be entered as a mortgage liability on the application, and its payment counts in your debt-to-income ratio. So the HELOC does not disqualify the down payment, but it does consume DTI capacity. Get the HELOC in place and know its payment before your lender runs the investment-loan numbers, and expect the lender to document where the funds came from.

Cash-out refinance proceeds work similarly. The cash is yours at closing and is documented through the refinance closing disclosure, and the new, larger first-mortgage payment is what hits your DTI.

DSCR loans

DSCR lenders qualify the deal primarily on the subject property's rent covering its own payment, not on your personal income. That makes them popular with investors whose DTI is already loaded. Down payment sourcing still gets documented, and most DSCR programs season or paper-trail large deposits, but a HELOC draw is a routine, explainable source. Guidelines vary significantly by lender, so confirm the specific program's sourcing and reserve requirements in writing.

Either way, plan the sequencing. Open the credit line, let the funds land, and document the trail before you go under contract. If you want help modeling a specific purchase against current inventory, that is exactly what a buyer consultation is for.

Frequently asked questions

Is HELOC interest deductible if I use it to buy a Miami rental property?

Not as home mortgage interest. Publication 936 limits that deduction to proceeds used to buy, build, or substantially improve the home securing the loan [3]. However, interest traced to the acquisition of a rental property may be deductible as a rental expense against that property's income [4]. Work with a CPA on the tracing before you draw.

Can I use a HELOC for the down payment on a conventional investment loan?

Generally yes. Borrowed funds secured by an asset you own are an acceptable down payment source under Fannie Mae guidelines, but the HELOC payment is counted as a mortgage liability in your debt-to-income calculation [5].

When does a cash-out refinance beat a HELOC?

Mainly when your existing first-mortgage rate is at or above current market rates, when you want a fixed rate on the full amount, or when you need a large lump sum and prefer one predictable payment. If your first mortgage is well below current rates, repricing it usually costs more than the HELOC's rate premium.

Do DSCR lenders care where my down payment came from?

They still document it, but they qualify the loan on the property's rent-to-payment coverage rather than your personal DTI. A HELOC draw is a common, acceptable source under most programs, subject to each lender's sourcing and reserve rules.

How much can I borrow against my Miami home?

It depends on your home's current value, your existing mortgage balance, and the lender's combined loan-to-value cap. Knowing what your home is actually worth is the starting point, and a professional valuation of your home will give you a realistic equity number before you talk to lenders.

Gabriel

Sources

Gabriel A. Moyers, PA. eXp Realty. Florida License #3407280. Equal Housing Opportunity. This article is general information as of July 2026 and is not legal, tax, or financial advice. Verify current figures against authoritative sources before acting.