How to Calculate Your Monthly Mortgage Payment
Calculating a mortgage payment involves more than just splitting the home purchase price over 15 or 30 years. Lenders look at your total PITI payment—Principal, Interest, Property Taxes, and Homeowners Insurance—to evaluate loan qualification.
The Standard Mortgage Formula
The principal and interest payment is calculated using the standard compounding loan equation:
M = P [ r(1 + r)^n ] / [ (1 + r)^n - 1 ]- M = Monthly Principal & Interest Payment
- P = Principal Loan Balance (Home Price minus Down Payment)
- r = Monthly Interest Rate (Annual Rate divided by 12)
- n = Total Payment Months (Years multiplied by 12)
Understanding PITI Components
- Principal: The portion of your payment that directly reduces your remaining loan balance.
- Interest: The fee charged by the lender for borrowing money.
- Property Taxes: Assessed by your local county or municipal government, usually paid into an escrow account.
- Homeowners Insurance: Protects your property against fire, hazards, and structural damage.
Frequently Asked Questions (FAQ)
What is included in a PITI mortgage payment?
PITI stands for Principal, Interest, Taxes, and Insurance. It reflects your full monthly housing obligation by adding property taxes and homeowners insurance to your principal and interest payment.
How can I avoid paying Private Mortgage Insurance (PMI)?
You can avoid PMI by making a down payment of at least 20% of the home purchase price. If your down payment is below 20%, PMI is automatically added to protect the lender.
How does a 15-year mortgage compare to a 30-year mortgage?
A 15-year mortgage has higher monthly payments but saves tens of thousands of dollars in total interest and builds home equity much faster than a 30-year loan.