What's Actually in Your Monthly Mortgage Payment?
Gaurav Yadav
Plenty of first-time buyers work out a loan payment, decide they can afford it, and then get to closing and find the real monthly figure is several hundred dollars higher. Nothing went wrong. They just calculated one of four components and assumed it was the whole payment.
Here’s what’s actually in there.
PITI: the four parts
Your monthly payment is made up of Principal, Interest, Taxes, and Insurance. Lenders call it PITI, and it’s the number they use when deciding what you qualify for.
Principal reduces the loan balance. This is the only part that builds equity.
Interest is the lender’s charge on the outstanding balance. Early in a 30-year loan this dwarfs the principal portion — on a $400,000 loan at 6.5%, the first payment is roughly $2,167 of interest against about $361 of principal. It takes about eighteen years before the split evens out.
Property taxes are set by your county and typically run 0.5% to 2.5% of assessed value annually, depending on where you live. On a $400,000 home that’s anywhere from $167 to over $800 a month. This is the single biggest reason two identical houses in different states carry very different payments.
Homeowners insurance is required by every lender. Budget roughly $100 to $250 a month for a typical home, considerably more in areas exposed to hurricanes, wildfire, or flood.
Most loans collect taxes and insurance monthly and hold them in escrow, paying the bills on your behalf when they come due. You don’t get a separate tax bill — it’s folded into the payment.
Our Mortgage Calculator builds the full PITI figure rather than just the loan repayment, so what you see is closer to what you’ll actually pay.
The two extras that catch people out
PMI (private mortgage insurance) applies when you put down less than 20% on a conventional loan. It typically costs 0.3% to 1.5% of the loan amount per year — on a $380,000 loan, somewhere between $95 and $475 a month. It protects the lender, not you.
The useful part: PMI isn’t permanent. You can generally request cancellation once your balance reaches 80% of the original value, and it’s required to terminate automatically at 78%. Many people carry it for years past the point they could have removed it, simply because nobody tells you when you cross the line. Track it yourself. FHA loans work differently — their mortgage insurance often lasts the life of the loan.
HOA dues aren’t part of PITI and don’t go through escrow, but they’re a genuine monthly obligation and lenders count them when assessing what you can afford. Condos and planned communities can run anywhere from $50 to $700 a month or more.
Why a “fixed-rate” payment isn’t fixed
This surprises people. On a 30-year fixed loan, the rate is locked and the principal-and-interest portion never changes for thirty years.
Your total payment absolutely can change, because taxes and insurance both move. A county reassessment, a new local levy, or an insurance market hardening in your region all flow straight into your escrow. Payment increases of $100 to $300 a month from escrow adjustments alone are routine, and in states with rapidly rising assessments or difficult insurance markets they can be much larger.
Budget with some headroom for this. A payment that only just works at closing is a payment that stops working in year three.
What you can actually afford
Lenders use two ratios.
The front-end ratio — housing costs as a share of gross monthly income — is conventionally kept at or below 28%.
The back-end ratio — all monthly debt payments, housing included, as a share of gross income — is conventionally kept at or below 36%, though many programmes will approve considerably higher, into the mid-40s.
Together these are the 28/36 rule. On a $100,000 household income, that’s roughly $2,333 a month for housing and $3,000 for all debt combined.
Your back-end ratio is just your debt-to-income ratio, which is worth calculating before you talk to a lender rather than after — the Debt-to-Income Calculator will give you the number they’ll be looking at.
One caution about approval amounts. Lenders approve based on gross income and the debts that appear on your credit report. They don’t see your childcare costs, your retirement contributions, your actual tax withholding, or what you spend on anything. Maximum approval is a ceiling, not a recommendation, and the gap between “approved for” and “comfortable at” is often $100,000 or more of purchase price.
Work out your own number from your take-home pay and your real spending, then treat the lender’s figure as an upper bound you probably shouldn’t approach.
Conforming limits and jumbo loans
There’s a threshold worth knowing about. Loans up to the conforming loan limit can be bought by Fannie Mae and Freddie Mac, which makes them cheaper and easier to underwrite. Above it, you’re in jumbo territory — typically higher rates, larger down payments, and stricter income and reserve requirements.
For 2026, the baseline conforming limit for a one-unit property is $832,750 across most of the US, up from $806,500 in 2025. In designated high-cost areas the ceiling is $1,249,125, and Alaska, Hawaii, Guam and the US Virgin Islands use that higher figure as their baseline.
If you’re buying near that line, it’s often worth adjusting the down payment to land just under it. The financing terms on either side can differ enough to matter.
The 15-year question
A 15-year loan carries a lower rate and dramatically less total interest. On $400,000, the difference over the life of the loan is frequently more than $200,000.
The catch is the monthly payment, which runs roughly 40–50% higher. That’s a real constraint on the rest of your financial life for fifteen years.
A reasonable middle path: take the 30-year for the flexibility of a lower required payment, then pay it like a 15-year when you comfortably can. You capture most of the interest savings and keep the ability to fall back to the lower payment in a bad year. Just confirm your servicer applies the extra to principal rather than crediting it forward.
The number to actually check
Before you commit, calculate your full PITI plus HOA plus a realistic maintenance allowance — 1% of the home’s value per year is the usual rule of thumb — and compare that against your take-home pay, not your gross.
If that combined figure sits comfortably under a third of what actually lands in your account each month, you’re in reasonable shape. If it needs everything to go right, it isn’t a payment you can afford. It’s a payment you can just barely make.
Conforming loan limits are from the FHFA announcement of November 2025 and apply through 2026. Property tax rates, insurance costs, and PMI pricing vary widely by location and lender. This article is general information, not financial advice.