These Costs Can Raise Your Mortgage Payment Even With A Fixed Rate

Most Americans, when applying for a mortgage, prefer a fixed-rate program instead of an adjustable one where the rate can change. In 2024, the Federal Reserve Bank of St. Louis reported how 92% of the mortgages were fixed. The appeal of this loan type is that the borrowers' principal and interest (P&I) payment will remain the same throughout the loan term, making budgeting for it straightforward. The principal is the amount borrowed to buy the home, paid back in term-based increments, while interest is the amount paid to the lender on top of the principal.

During the application process, lenders will make sure that borrowers can afford their mortgages based on their incomes. Financial institutions often rely upon the 28% rule, meaning that housing expenses should not take up more than 28% of the borrowers' pre-tax income. However, these expenses consist of more than a P&I payment: Most homeowners will have to pay their principal, interest, taxes, and insurance (PITI), and those latter two elements (TI) can increase even for those with a fixed-rate mortgage.

Municipalities can raise tax rates based on factors like area property values and community needs, causing higher bills for homeowners. Meanwhile, insurance rates tend to go up with rising home repair and replacement costs. Since many homeowners have their insurance and tax bills added to their mortgage payments via escrow accounts, they can expect their monthly housing bill to increase by roughly 8.3% — or ¹⁄₁₂ — of however much their TI expenses go up.

According to Lending Tree's analysis of data from the Census Bureau's 2024 American Community Survey, average property taxes rose by 5.1% from 2023 to 2024. In that same period, the average household saw its property tax burden increase by $150 per year. That's an increase of $12.50 a month, although that figure could vary widely based upon the homeowner's location.

That average increase may or may not sound affordable, but increases in homeowner insurance premiums can hit budgets more significantly. According to a 2025 report by the Consumer Federation of America, homeowners have endured an average of a 24% increase in homeowner insurance premiums over the previous three-year period. This increase outpaced overall inflation over the same period by 11%, totalling in an average premium increase of $648 per year. The report showed increases in 95% of the zip codes, making it a national trend, although regional differences can be significant: Utah homeowners experienced the largest increase at 59%, followed by Illinois, Arizona, Pennsylvania, and Nebraska. Meanwhile, residents of West Virginia and Mississippi actually experienced premium declines.

Savvy homeowners may consider putting enough funds away in their emergency savings account to ensure that they can cover increases in their housing expenses, even when they have a fixed interest rate. To plan for potential tax and insurance increases, looking over your bills from the previous few years could help give you a sense of what to expect in terms of potential increases.