How to Calculate If Refinancing Saves Money

Deciding whether to refinance your mortgage can be a complex financial decision. This guide explains how to calculate if refinancing saves money by comparing the costs and benefits of your current mortgage with potential refinancing options.

What Is Refinancing?

Refinancing a mortgage involves replacing your current loan with a new one, typically to take advantage of lower interest rates or better loan terms. There are several types of refinancing:

Rate-and-term refinance: Extends the loan term while taking advantage of lower interest rates.
Cash-out refinance: Borrows more than the current mortgage balance to use for home improvements or other expenses.
Streamline refinance: Available to FHA loan holders, simplifies the refinancing process with minimal documentation.

Refinancing can save money if the new interest rate is significantly lower than the current rate, but it's important to consider closing costs, fees, and the impact on your monthly payments.

How to Calculate If Refinancing Saves Money

To determine if refinancing saves money, compare the total cost of your current mortgage with the potential refinanced mortgage. The key factors to consider are:

Current mortgage balance and interest rate
New loan terms (interest rate, loan term)
Closing costs and fees
Monthly payment differences
Total interest paid over the life of the loan

Refinancing Savings Formula

The total savings from refinancing can be calculated by comparing the total interest paid on both loans:

Savings = (Current Interest Paid) - (New Interest Paid) - (Closing Costs)

To calculate the total interest paid on each loan, use the mortgage payment formula:

Mortgage Payment Formula

Monthly Payment = P * (r(1+r)^n) / ((1+r)^n - 1)

Where:

P = Principal loan amount
r = Monthly interest rate (annual rate divided by 12)
n = Number of payments (loan term in years multiplied by 12)

Once you have the monthly payments for both loans, multiply by the loan term to get the total interest paid. Subtract the closing costs from the difference in total interest to determine the net savings.

Key Factors to Consider

When calculating if refinancing saves money, consider these important factors:

Interest rate difference: The primary benefit of refinancing is a lower interest rate. Even a small reduction can save thousands over the life of the loan.
Loan term: Extending the loan term can lower monthly payments but may increase the total interest paid.
Closing costs: Refinancing typically involves closing costs, which can offset potential savings.
Private mortgage insurance (PMI):strong> If you have less than 20% equity, you may need PMI, which can increase monthly payments.

Home value appreciation: If your home has appreciated in value, you may qualify for a lower interest rate.

Tip: Use our refinancing calculator to compare different scenarios and see how changes in interest rates, loan terms, and closing costs affect your savings.

Example Calculation

Let's look at an example to illustrate how to calculate if refinancing saves money.

Current Mortgage

Loan amount: $200,000

Interest rate: 5.5% (0.4583% monthly)

Loan term: 30 years (360 months)

Monthly payment: $1,107.76

Total interest paid: $162,527.20

Potential Refinanced Mortgage

Loan amount: $200,000

Interest rate: 4.5% (0.375% monthly)

Loan term: 30 years (360 months)

Monthly payment: $1,007.76

Total interest paid: $132,527.20

Closing costs: $3,000

Savings Calculation

Difference in interest paid: $162,527.20 - $132,527.20 = $30,000

Subtract closing costs: $30,000 - $3,000 = $27,000

Monthly payment difference: $1,107.76 - $1,007.76 = $100

In this example, refinancing saves $27,000 over the life of the loan, with a monthly payment reduction of $100.

Frequently Asked Questions

How long does it take to refinance a mortgage?

The refinancing process typically takes 30 to 45 days, but it can vary depending on the type of loan, lender, and your financial situation.

What are the closing costs for refinancing?

Closing costs for refinancing typically range from 2% to 5% of the loan amount and may include appraisal fees, credit report fees, title insurance, and origination fees.

Can I refinance if I have bad credit?

Yes, but you may need to look for specialized lenders or programs designed for borrowers with less-than-perfect credit. Interest rates may be higher.

What happens if interest rates rise after refinancing?

If interest rates rise, you may be able to refinance again to take advantage of lower rates. Some loans include rate adjustment clauses that allow you to refinance without penalties.