Why a Fixed-Rate Mortgage Still Isn’t Fully Fixed

Imagine two homeowners with identical loan terms: a 30-year fixed-rate mortgage at 6.59%. One lives in Honolulu, while the other owns a home in Pensacola, Florida.

According to a study covering nearly 450 metro areas by Neighbors Bank, the Honolulu homeowner’s typical principal-and-interest payment is $4,243 a month. In Pensacola, it is $1,531.

That difference may ease the pressure for a buyer in Florida, but it also means the share of the total housing bill going to costs other than the loan is much larger in Pensacola.

The contrast highlights a lesson many buyers discover only after closing: “fixed” applies to the interest rate, not to the full monthly bill.

What a fixed rate really covers

A fixed-rate mortgage eliminates one major uncertainty: the interest rate. That means the principal-and-interest portion of your payment remains unchanged for the life of the loan. If market rates rise, you are protected. If they fall, refinancing may be an option.

That protection is valuable, but it applies to only one piece of the monthly cost.

The rest of homeownership does not stay locked in. As The Washington Post has noted, property taxes and homeowners insurance are two required expenses that many buyers underestimate while focusing on the home price and mortgage rate. Across the metro areas in the Neighbors Bank study, those two costs averaged about 21% of the monthly mortgage payment.

Costs that can still rise

Lenders usually collect taxes and insurance through an escrow account that is built into the monthly payment. Low down-payment loans backed by the FHA, USDA, or VA often require one, according to the report. The lender then pays the tax and insurance bills when they come due.

But there is a catch: those bills can change, and the lender will adjust the escrow amount to match. If taxes or insurance premiums increase, the monthly payment rises too, even if the mortgage rate does not.

Location matters as well. Pensacola, Florida, ranked first among the highest-burden markets. There, taxes and insurance account for 43.6% of the average payment, or $1,183 on top of $1,531 in principal and interest. At the other end, urban Honolulu ranked lowest at 9%, or $420 on top of $4,243.

That does not mean Honolulu is better than Pensacola, or the reverse. It does mean that looking only at the advertised principal-and-interest amount can lead a buyer to seriously underestimate monthly housing costs.

Jake Vehige, president of mortgage lending at Neighbors Bank, said it simply: “Many homeowners assume their payment will stay the same each year, but even if your mortgage rate doesn't change, taxes and insurance often do.”

Other expenses, including maintenance, repairs, and utilities, are not included in escrow at all. Those remain the homeowner’s responsibility.

How an adjustable-rate mortgage compares

An adjustable-rate mortgage, or ARM, adds another layer of uncertainty. It begins with a fixed rate for a set period. After that, the rate can change based on the loan terms, and the principal-and-interest payment can change with it.

It is easy to see the fixed-rate mortgage as the safe choice and the ARM as the risky one, but that is an oversimplification.

Both loan types leave the borrower exposed to taxes and insurance changes. The fixed-rate loan removes interest-rate risk, while the ARM keeps that risk once the introductory period ends. The real issue is which risks you can handle, and for how long.

If you expect to keep the home for decades, the adjustment terms matter greatly. If you plan to move or refinance sooner, the length of the initial fixed period may matter more. In either case, review the loan documents carefully to see how long the introductory period lasts, how often the rate may reset, and how high it can rise.

How to estimate what you can afford

Before choosing a loan or setting a home price, it helps to build your own monthly number.

Start with the full monthly cost

Add principal and interest, property taxes, homeowners insurance, and any HOA dues or mortgage insurance. That is your true monthly housing expense, not just the fixed-rate portion.

Get the real tax and insurance figures

Ask for the property’s current tax bill and find out whether a sale could trigger a reassessment. Get an insurance quote for that exact address before making an offer.

Stress-test the escrow

If taxes and insurance begin at $400 a month, a 5% annual increase would put them at roughly $650 a month after ten years. That is not a prediction, but it shows how a “fixed” payment can gradually climb. Consider whether you could still manage that increase.

If you are looking at an ARM, check the worst case

Identify the highest rate the loan permits and calculate what the payment would be at that level. If you could not afford that amount, the introductory discount may not be much of a deal.

Match the loan to your time horizon

Think about how long you realistically expect to own the home, and then consider which costs could increase during that period.

Leave room for maintenance

Maintenance is not part of the mortgage payment, but it is still part of owning a home.

The bottom line

A fixed-rate mortgage locks in one figure, but not your total cost of ownership. To avoid surprises and protect your budget, compare loans using the home’s full monthly cost and understand which expenses may rise over the years you expect to own it.

Before making an offer, get the property’s tax bill and a homeowners insurance quote, then revisit your budget using numbers that are slightly higher than today’s. If the home still works, you are buying with a cushion instead of just hoping your payment never changes.

This article is for informational purposes only and should not be considered investment advice.

Choice Home Warranty Benefits

• First month free
• Protection for unexpected expense
• 24/7 claims hotline
• Network of over 15,000 technicians