Step 1 · The two numbers are never the same
What you can afford is not what you're approved for
A lender approves you on a ratio. They take your gross income, add up your debts, and tell you the largest payment the guidelines allow. That number is a ceiling, not a recommendation, and nobody in the transaction is paid to tell you it's too high.
The payment itself is PITIA — principal, interest, taxes, insurance and association dues. In most of the country the last three are a rounding error. In Florida they routinely run $900 to $1,400 a month on a $425,000 house, and they are the three that rise.
Here is the specifically Florida trap, and almost every first-time buyer walks into it. The tax figure quoted to you is often the seller's — and if the seller has had homestead exemption and the Save Our Homes cap for fifteen years, their assessed value may be less than half what you're paying. The county reassesses at your purchase price. Your tax bill in year two can be double the number on the listing, and it is entirely predictable if anyone bothers to run it.
Budget off the seller's homesteaded tax bill and a placeholder insurance quote, and the real year-two payment on a $425,000 Florida home lands roughly $750 a month higher than you planned — about $9,000 in the first full year, every year.
Where I earn the fee
Before you look at a single house I run the real PITIA: the tax at your purchase price rather than the seller's, a live insurance quote instead of a guess, and the actual HOA and CDD figures for that specific address. Then we pick a number you're comfortable with, which is usually well below what you were approved for.