How to Calculate Property Taxes and HOA Fees into Your Mortgage

When buying a home in the United States, your monthly payment to the bank is rarely just the cost of the house. Many first-time homebuyers make the mistake of only calculating the Principal and Interest, completely forgetting the hidden monthly costs that can add hundreds or even thousands of dollars to their monthly bill.

To get an accurate picture of what you will actually owe every month, you need to calculate PITI: Principal, Interest, Taxes, and Insurance.

In this guide, we'll explain how to calculate property taxes, Homeowners Association (HOA) fees, and Private Mortgage Insurance (PMI) into your total monthly payment.

If you want to skip the math, use our free Mortgage Calculator which handles all of these variables for you instantly.

1. Calculating Property Taxes

In the US, property taxes are levied by local governments (counties, cities, or school districts) and are based on the assessed value of your property.

Property tax rates vary wildly across the country. For example, a homeowner in New Jersey might pay over 2.4% in property taxes annually, while a homeowner in Hawaii might pay less than 0.3%.

How to Calculate It:

1. Find your local tax rate: Let's say your local property tax rate is 1.2%.
2. Multiply by the home's value: If your home is worth $400,000, your annual property tax is $400,000 × 0.012 = $4,800.
3. Divide by 12: To find the monthly cost that will be added to your mortgage, divide by 12. ($4,800 ÷ 12 = $400/month).

Most mortgage lenders will collect this $400 every month and put it into an escrow account, paying the government on your behalf when taxes are due.

2. Factoring in HOA Fees

If you are buying a condo, a townhouse, or a home in a planned community, you will likely have to pay Homeowners Association (HOA) fees.

These fees cover the maintenance of shared spaces (pools, landscaping, roofs, security) and can range anywhere from $50 to over $1,000 a month depending on the amenities.

Important: Unlike property taxes, HOA fees are usually paid directly to the HOA, not your mortgage lender. However, mortgage lenders absolutely factor this fee into your "Debt-to-Income" (DTI) ratio when deciding if you qualify for the loan.

Always subtract the estimated HOA fee from your total monthly budget before looking at houses!

3. Don't Forget PMI (Private Mortgage Insurance)

If you put down less than 20% on a conventional loan in the US, the lender will usually require you to pay Private Mortgage Insurance (PMI). This protects the lender in case you default on the loan.

PMI typically costs between 0.5% to 1.5% of the original loan amount per year.

How to Calculate It:

1. Determine your loan amount: If you buy a $400,000 house with a 10% down payment ($40,000), your loan amount is $360,000.
2. Estimate the PMI rate: Assume a 1% PMI rate based on your credit score.
3. Calculate annual cost: $360,000 × 0.01 = $3,600 per year.
4. Divide by 12: $3,600 ÷ 12 = $300/month added to your mortgage.

The good news? PMI is not permanent. Once you have paid off enough of your principal to reach 20% equity in the home, you can request your lender to cancel the PMI!

Calculate It All Instantly

Doing this math by hand for every house you look at on Zillow or Redfin can be exhausting.

That's why we built our Advanced Mortgage Calculator. Simply enter the home price, your down payment, and your estimated interest rate, and the tool will automatically calculate your Principal, Interest, Property Taxes, HOA fees, and PMI to give you your true monthly payment.