Mortgage PITI Explained: The Real Cost of Owning a Home

When you ask "how much will my mortgage payment be?" the honest answer is "it depends on what you mean by mortgage payment." If you mean just principal and interest, that's one number. If you mean what you'll actually write a check for every month, that's a different, larger number. The difference is PITI.

This article explains exactly what PITI stands for, how each component is calculated, and why it's the only number that matters when you're trying to figure out whether you can actually afford a house.

What PITI stands for

PITI is the four components of a typical American mortgage payment:

• Principal — the part of your payment that pays down what you borrowed
• Interest — the part that pays your lender for the privilege of borrowing
• Taxes — your property taxes, paid monthly to the lender who then pays them annually to your county
• Insurance — your homeowner's insurance premium, similarly paid monthly to the lender

For most loans, all four are bundled into a single monthly payment. The lender holds the tax and insurance portions in an "escrow account" until those bills come due, then pays them on your behalf. You see one number on your bank statement: the PITI.

The trap of "principal and interest only" calculators

Here's where most first-time buyers get blindsided. Online mortgage calculators — including the one on every major real estate site — usually show only Principal and Interest (P&I). The P&I number is always smaller than your actual monthly payment. Sometimes much smaller.

Example: a $400,000 home with 20% down at 7% interest:

Component	Monthly amount
Principal & Interest	$2,129
Property Taxes (1.5% of value)	$500
Homeowner's Insurance ($1,800/yr)	$150
Total PITI	$2,779

The buyer who used a "P&I only" calculator budgeted for $2,129 a month and is now staring at a $2,779 payment. That's a $650/month surprise — $7,800 a year. People plan vacations, daycare costs, and car payments on numbers like that.

Always use a calculator that includes taxes and insurance. Always.

Component 1: Principal

Principal is the amount you borrowed. On a 30-year mortgage, your monthly principal payment starts very small (most of the payment goes to interest in early years) and grows over time. By year 15, you're paying down meaningful chunks of the loan. By year 25, almost the whole payment is going to principal.

This is just how amortization works. It's the reason most people who refinance after 5 years still owe nearly the original loan amount — they've barely paid down any principal yet.

Component 2: Interest

Interest is what the lender charges for the loan. The interest rate determines this. Today, 30-year fixed rates typically run between 6-8% depending on credit score, loan type, and market conditions.

A small change in interest rate has a big effect on the payment:

Loan	Rate	Monthly P&I	Total interest over 30 years
$320,000	6.0%	$1,919	$370,684
$320,000	6.5%	$2,023	$408,141
$320,000	7.0%	$2,129	$446,428
$320,000	7.5%	$2,237	$485,512
$320,000	8.0%	$2,348	$525,367

The difference between 6% and 8% on the same loan is over $400 a month and $155,000 in lifetime interest. This is why getting your credit score up before you apply for a mortgage matters so much — even half a point can save you tens of thousands.

Component 3: Property Taxes

Property taxes are the most variable part of PITI. They depend entirely on where you live. A $400,000 home pays vastly different taxes in different states:

State	Avg property tax rate	Annual on $400K home	Monthly
Hawaii	0.27%	$1,080	$90
Colorado	0.51%	$2,040	$170
Florida	0.83%	$3,320	$277
California	0.75%	$3,000	$250
Texas	1.68%	$6,720	$560
New Jersey	2.23%	$8,920	$743
Illinois	2.05%	$8,200	$683

The same house in New Jersey costs $653 more per month in taxes than the same house in Hawaii. When you're comparing two homes in different states or counties, look up the actual tax rate, not the national average.

Property taxes also go up over time. They're reassessed every 1-3 years in most jurisdictions. Budget for them to increase 2-4% per year over the life of your loan.

Component 4: Homeowner's Insurance

Homeowner's insurance is required by your lender. It protects the property (and them, since they have a stake in it) against fire, storms, theft, and liability. Premiums vary dramatically by location:

• Average US: $1,400-$1,800 per year ($117-$150/month)
• Florida (hurricane risk): $3,000-$8,000+ per year
• California (wildfire/earthquake): $1,500-$5,000+ per year
• Tornado Alley: $1,800-$3,500 per year
• Low-risk Midwest: $900-$1,400 per year

Get quotes from at least three insurers before locking in. Bundling with auto insurance typically saves 10-20%. Raising your deductible from $1,000 to $2,500 typically saves another 10-15%.

The "fifth letter": PMI

If you put less than 20% down on a conventional loan, you'll also pay Private Mortgage Insurance (PMI). It's a separate monthly fee that compensates the lender for the risk of you defaulting. PMI typically runs 0.5-1.5% of the loan amount per year.

Example: $360,000 loan with PMI at 0.7% = $2,520/year = $210/month extra. The good news: PMI drops off automatically once you've paid down to 78% of the original purchase price. The bad news: that takes years, and you can pay $20,000+ in PMI before it goes away.

FHA loans use a similar concept called Mortgage Insurance Premium (MIP), which often lasts the life of the loan unless you refinance.

What about HOA dues?

HOA dues aren't part of PITI but they're a real monthly cost. Condominiums often have HOAs of $300-$800/month. Single-family neighborhoods with HOAs typically charge $50-$300/month. Always factor HOA dues into your real monthly cost when comparing homes.

The 28% rule

The most widely-used rule of thumb is that your PITI shouldn't exceed 28% of your gross monthly income. That's gross, not net. So if you earn $8,000/month gross, your maximum PITI should be about $2,240.

Many lenders will approve you for more than this — sometimes much more. Just because they will doesn't mean you should. The 28% rule exists because going much higher leaves you "house poor" with no money for vacations, retirement savings, or unexpected expenses.

If your dream home pushes PITI to 35%+ of income, run the math twice and consider waiting another year to save more or to qualify for a better rate.

Bottom line

Your real monthly mortgage payment is PITI: Principal + Interest + Taxes + Insurance. The "P&I only" number you see on most online calculators is misleadingly low. Always calculate the full PITI before deciding what you can afford. Look up your actual property tax rate, get insurance quotes early, and factor in PMI if your down payment is under 20%.

The buyers who use real numbers don't get blindsided at closing. The buyers who use Zillow's "estimated monthly payment" sometimes do.