Rental Property Refinance Interest Rate Calculator

This calculator estimates the monthly principal-and-interest payment and total interest for a rental-property refinance using the loan amount, APR, and term you enter. It does not determine the interest rate a lender will offer; enter a rate quoted for your situation to see how the loan arithmetic changes.

Formula

The calculator uses the standard fixed-rate, fully amortizing loan payment formula. It first converts the annual percentage rate (APR) to a monthly rate, then calculates a level monthly payment over the loan term:

• Monthly rate: r = APR / 1200, where APR is entered as a percentage per year.
• Number of payments: n = years × 12.
• Monthly payment: M = P × r / [1 − (1 + r)⁻ⁿ].
• Total interest: I = M × n − P.

P is the refinance loan amount in dollars, r is the monthly interest rate as a decimal, n is the number of monthly payments, and M is the payment in dollars. The displayed payment is rounded to cents; total interest is calculated from that rounded payment. This is an estimate for principal and interest, not a quote or a complete rental-property cash-flow calculation.

Worked Example

Using the calculator’s defaults—$20,000 principal, 8% APR, and a 5-year term—the calculation is:

1. Convert the APR to a monthly rate: 8 / 1200 = 0.0066667.
2. Convert the term to payments: 5 × 12 = 60 months.
3. Apply the payment formula: M = 20,000 × 0.0066667 / [1 − (1.0066667)⁻⁶⁰].
4. The monthly principal-and-interest payment is $405.53.
5. Total interest using the rounded payment is $405.53 × 60 − $20,000 = $4,331.80.

The defaults are only a worked mathematical example. They do not represent a current, typical, or offered rental-property refinance rate. Replace them with figures supplied for the loan being evaluated.

Assumptions

• The interest rate stays fixed throughout the stated term.
• Payments are equal monthly payments, made at the end of each monthly period.
• Interest compounds monthly at APR / 12.
• The calculation excludes lender fees, closing costs, taxes, insurance, mortgage insurance, escrow, prepayment charges, and any costs rolled into the loan unless those amounts are included in the principal input.

What Rate Applies to a Rental Property Refinance?

There is no single interest rate for a rental-property refinance. The rate is a lender-specific offer based on the loan and borrower details at the time of application. A rate that applies to an owner-occupied home should not automatically be assumed to apply to a property held for rent. For an accurate estimate, use the rate and APR shown in a lender’s written quote or disclosure, and check whether the quoted figure is an interest rate or an APR that also reflects certain costs.

Rates can differ with factors such as the requested loan amount, term, property type, occupancy, equity, credit and income assessment, and whether the rate is fixed or adjustable. The lender determines which factors it considers and how they affect an offer. This calculator cannot estimate a personalized rate, infer approval, or account for every loan structure. No particular rate or eligibility outcome can be established from the property being a rental alone.

How to Use the Estimate

Enter the amount expected to be borrowed after any payoff, cash-out, or costs financed into the new loan. Use the APR as a percentage—enter 7.5 for 7.5%, not 0.075—and select the loan term in years. The first result is the estimated monthly principal-and-interest payment; the second is the interest paid across all scheduled payments under the assumptions above.

For example, a refinance may replace an existing mortgage balance with a new loan, and a cash-out refinance may increase the amount borrowed. The payment calculation only sees the new principal, rate, and term. It does not determine how much equity is available or whether a lender will approve a requested amount. If fees are financed, include them in the loan amount to see their effect on payment and interest; if paid separately, the calculator will not include them in the totals.

When comparing quotes, keep the principal and term consistent, and compare the quoted APR as well as the interest rate and itemized charges. A lower monthly payment alone does not prove the refinance costs less: extending the term can reduce the payment while increasing the number of months during which interest accrues.

Costs and Limits to Consider

A refinance’s overall cost can include charges that are not part of the payment formula. Obtain the lender’s itemized estimates and identify which charges are paid up front and which, if any, are added to the balance. The calculator does not estimate a break-even date because that requires actual refinance costs and a defined comparison with the existing loan.

Other limitations matter when interpreting results:

• Variable rates: an adjustable rate can change, so one fixed APR cannot describe every future payment.
• Payment timing and rounding: actual servicing schedules, daily interest conventions, and rounding can cause small differences.
• Escrow and property expenses: rent, vacancy, repairs, management, taxes, and insurance are not included. The displayed payment is not a measure of rental profit.
• Prepayment or payoff amounts: a payoff quote may differ from the loan balance because of accrued interest or other charges; use the lender’s figures when preparing a comparison.

A common misconception is that refinancing automatically lowers the total cost whenever the new rate is lower. The rate is only one input: the new balance, fees, term, and how long the loan is kept also affect the dollars paid. Conversely, a lower payment may result mainly from a longer term rather than a lower total borrowing cost. The calculator shows scheduled loan arithmetic, not a recommendation to refinance.

Frequently Asked Questions

What is the interest rate for a rental property refinance?
It varies by lender, loan details, and borrower circumstances, and there is no universal rate. Request a current quote for the specific property and financing structure; this calculator can then estimate payments using that quoted APR.

Is a rental-property refinance rate different from an owner-occupied mortgage rate?
They may be treated differently in a lender’s pricing, but the amount and terms depend on the particular offer. Do not use an owner-occupied quote as a substitute for a rental-property quote.

Should I enter the interest rate or APR?
Enter the annual percentage rate (APR) when available, because it is intended to reflect the annual borrowing cost in a standardized form. Check the quote’s definitions and included charges; this calculator does not independently convert fees into APR.

Does the monthly payment include taxes and insurance?
No. The result is principal and interest only. Taxes, insurance, escrow, property expenses, and lender charges are excluded unless included in the principal amount you enter.

Why can a refinance have a lower payment but more total interest?
A longer repayment term spreads payments over more months. That can lower each payment while allowing interest to accrue for longer; compare the complete payment schedule and costs, not just the monthly figure.

This result is an estimate, and the lender’s disclosure gives the exact figures.

Related

• Interest Rate Duration: Meaning and Bond Sensitivity
• Interest Rate Differential Calculator and Explanation
• Interest Rate Dot Plot: What It Shows and How to Read It

in p | Loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
out pmt | Monthly payment | $ | p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2