Pay off or invest

Pay off your mortgage early or buy a rental property?

Extra cash raises a fair question: send it to the mortgage, or put it to work in another property? Paying down debt is a guaranteed, risk-free return equal to your interest rate. A rental can earn more, but it adds leverage, vacancy, repairs and time. This hub sets out the comparison without assuming either answer.

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Couple reviewing a mortgage statement and laptop at a kitchen table — AI-generated concept illustration; not a photo of a specific place or property.

Quick answer

Compare your mortgage interest rate — the certain return from prepaying — with the realistic after-cost return of a rental, after vacancy, repairs, management, insurance, tax and the risk of being wrong. If your rate is low, a rental with solid positive cash flow can outperform; if your rate is high, your cash reserves are thin or the rental only works with optimistic rent, paying down the loan is usually the safer choice. Keep an emergency fund either way: equity in a paid-down house is not cash until you sell or borrow. A recast can lower your payment after a lump-sum prepayment while keeping your rate, and borrowing against your home (HELOC or cash-out refinance) to buy a rental puts your own house behind the investment.

Your rate

Prepaying earns a guaranteed return equal to your mortgage interest rate

Itemize only

Mortgage interest lowers tax only if you itemize deductions (IRS Publication 936)

Illiquid

Home equity is not cash until you sell or borrow against it

Questions this hub answers

pay off mortgage or invest
should i pay off my mortgage early
pay off house or buy rental property
pay off mortgage or buy investment property
extra mortgage payments vs investing
mortgage recast
heloc to buy rental property

Five-step comparison

01
Write down your real mortgage rate
Use the rate on your note, and ask a tax adviser whether you itemize — if you take the standard deduction, the interest gives you no tax benefit.
02
Underwrite the rental conservatively
Use market rent from comps, then subtract vacancy, repairs, capital reserves, insurance, property tax, HOA and management. Use the down payment you would actually invest as the base.
03
Price the leverage
If the rental would be financed with a HELOC or cash-out refinance, use that rate and remember the loan is secured by your home.
04
Protect liquidity
Set aside an emergency fund before either option. Prepaid principal cannot be pulled back without a new loan.
05
Check payment flexibility
Ask your servicer whether the loan allows a recast after a lump-sum payment and whether any prepayment penalty applies.

Prepay, recast or buy a rental?

Option	Return	Risk	Liquidity
Extra principal payments	Guaranteed: your interest rate	Very low	Low — locked in the house
Lump sum + recast	Same rate saving, lower monthly payment	Very low	Low
Buy a rental with cash	Rent + appreciation − all costs	Vacancy, repairs, market	Low
Buy a rental with a HELOC	Rental return − HELOC interest	Higher: your home secures the loan	Low
Keep cash invested elsewhere	Varies with the investment	Varies	Usually higher

Craftsman rental house with a blank yard sign in an autumn Seattle neighborhood — AI-generated concept illustration; not a photo of a specific place or property.

Checklist

Numbers to gather first

Mortgage rate, balance and remaining term
Whether you itemize deductions
Emergency fund in months of expenses
Rent comps for the target rental
Full rental cost sheet incl. vacancy and reserves
HELOC or cash-out rate quote, if borrowing
Servicer answer on recast and prepayment penalty
Tax adviser review of rental income and depreciation

Pay off or invest FAQ

Is paying off my mortgage early a good idea?

It is a guaranteed return equal to your interest rate with no market risk, which makes it attractive when your rate is high or you dislike debt. It is less attractive when your rate is low and you have higher-return options you understand.

What is a mortgage recast?

After you pay a lump sum toward principal, the lender re-amortizes the remaining balance over the original term, lowering the monthly payment while keeping the same rate. Not every loan or servicer offers it, and fees vary.

Should I use a HELOC to buy a rental?

Only with a margin of safety. The HELOC rate is often variable, and the loan is secured by your home, so a vacancy or rate rise affects your own housing. Run the rental numbers at the HELOC rate.

Is rental income taxed?

Yes. Rental income is reported on your tax return, with deductible expenses and depreciation; IRS Publication 527 explains the rules. Ask a tax adviser for your situation.

Sources

Last checked November 13, 2026. Official sources for the key rules on this page; they describe general rules, and your contract, lender, tax adviser, association documents and each agency's current rules control your specific case.