Why Your Mortgage Payment Is Higher Than Principal and Interest
A mortgage payment quoted as "principal and interest only" is almost always lower than the actual monthly payment, because property tax, homeowners insurance, PMI (if applicable), and sometimes HOA dues are added on top and collected together as one combined monthly payment — commonly abbreviated PITI.
Getting a mortgage quote that's lower than what actually shows up on the first bill is one of the most common sources of home-buying frustration, and it almost always traces back to the same handful of add-on costs.
The four extra line items, one at a time
Property tax is collected monthly by most lenders and held in an escrow account, then paid to the local government on your behalf once or twice a year — even though you're paying it monthly, it doesn't appear in a bare P&I quote.
Homeowners insurance works the same way — collected monthly, paid annually, and required by virtually every lender before closing.
PMI applies only below a 20% down payment and is a separate monthly charge added specifically because the lender is taking on more risk with a smaller down payment.
HOA dues, when they apply, are typically billed directly by the homeowners association rather than collected by the lender, but still need to be budgeted as part of the true monthly housing cost even though they're technically outside the mortgage payment itself.
How to catch this before it surprises you
The fix is simple but often skipped: when comparing a quote, confirm explicitly whether it's P&I only or the full PITI figure. A Loan Estimate document (a standardized form lenders are required to provide) always itemizes these separately, so cross-checking against it before assuming a quoted number is your full payment avoids the surprise entirely.