How to Calculate the Extra Monthly Payment to Pay Off a Mortgage Early in Excel
Question details
The user wants to calculate the exact additional monthly payment required to pay off a 30-year mortgage in an accelerated timeframe of 15 years.
- Product
- Spreadsheet
- Device & OS
- not provided
- Scenario
- Comparing two mortgage terms (such as a 30-year versus a 15-year loan) under the same interest rate and principal amount to identify the extra monthly cost for early payoff.
- Observed behavior
- Requires a reliable financial formula or a loan calculator template to accurately compute the difference between the payments of the two different loan terms.
Gather your loan specifics beforehand, including the total principal amount, the fixed annual interest rate, and the current payment frequency (typically monthly).
Use the PMT Function to Calculate the Extra Payment
Calculate both the 30-year and 15-year monthly payments using the built-in PMT function, and subtract the results to find your extra monthly payment.
The PMT (Payment) function computes the periodic payment for a loan based on constant payments and a constant interest rate. To find the extra payment needed to finish paying in 15 years rather than 30, you need to calculate both payment scenarios and find the difference.
Launch your spreadsheet application and open a new blank workbook to start your calculation.
The basic structure is =PMT(rate, nper, pv). For monthly payments, you must divide the annual interest rate by 12, and multiply the number of years by 12 to get total months.
Select an empty cell and enter the formula subtracting the 15-year payment from the 30-year payment. For example, for a $250,000 loan at a 5% interest rate, type: =PMT(5%/12, 30*12, 250000) - PMT(5%/12, 15*12, 250000)
Press Enter. The cell will display the extra monthly payment required. For the example given, the result will be approximately $634.93.
Use a Pre-built Loan Amortization Template
Utilize a built-in loan calculator template to automatically calculate extra payments and visualize your early payoff schedule without writing formulas.
Calculate Mortgage Payments Easily with WPS Spreadsheet
WPS Office provides a highly capable Spreadsheet application equipped with over 400 functions, including financial formulas like PMT. It makes calculating complex mortgage amortizations and early payoff plans incredibly simple.
- 1. Download and Install: Download WPS Office from the official website and install it on your device.
- 2. Launch WPS Spreadsheet: Open WPS Office, click on 'Spreadsheet', and select a blank workbook or choose a loan template.
- 3. Input Financial Data: Type your principal, annual rate, and loan term into the spreadsheet.
- 4. Apply the PMT Formula: Use the PMT function to instantly calculate your regular and extra mortgage payments.
Frequently Asked Questions
Why does the PMT function return a negative number?
In financial spreadsheet functions, cash flows are directional. A negative number represents cash flowing out of your pocket (like a mortgage payment), while a positive number represents cash flowing in (like receiving the initial loan amount).
Does this calculation include my property taxes and home insurance?
No. The standard PMT function strictly calculates the principal and interest of the loan based on the rate and term. To determine your total monthly out-of-pocket cost, you must manually add your fixed monthly property taxes, insurance, and any HOA fees.
How much total interest will I save by paying off the mortgage in 15 years instead of 30?
To find your interest savings, calculate the total payments for both terms (Monthly Payment × Total Months) and subtract the original loan principal from both. Finally, subtract the 15-year total interest from the 30-year total interest to see your exact savings.
Can I use this formula if I have an Adjustable-Rate Mortgage (ARM)?
The standard PMT calculation assumes a fixed interest rate for the life of the loan. For an ARM, your monthly payment will change when the interest rate adjusts, so you would need a specialized amortization schedule to calculate payments period by period.
