Florida Mortgage & True Monthly Payment Calculator

PITI is only part of the number on the coast. This tool runs principal, interest, property taxes, homeowner's insurance, HOA and PMI together, and the notes below cover the piece most calculators skip — what flood zone and windstorm exposure add on top. Built by Tim Sherman, a Navy veteran and licensed Florida Realtor (SL3392180) working the beaches, Amelia Island, and coastal St. Johns County.

Why this calculator adds the water back in

I grew up working the water on the Chesapeake, and one habit stuck: check the chart before you commit to anything. On this coast, the "chart" for a mortgage payment is the flood zone and elevation, and most calculators skip straight past it to give you PITI and call it done. Run your home price, down payment, rate, and term through the fields above, then read on for what a waterfront, near-water, or even a few-blocks-back property in Coastal Duval, Nassau, or Coastal St. Johns can add to that number.

Principal & Interest

This is the piece that goes to your lender, calculated with the standard amortization formula: M = P [ i(1+i)^n ] / [ (1+i)^n − 1 ], where P is the loan amount, i is the monthly rate, and n is the number of payments. On a $360,000 loan at 6.5% over 30 years, principal and interest runs about $2,275 a month, with roughly $459,000 in interest paid over the full term.

Florida property taxes

The statewide average effective property tax rate sits around 0.80%–0.90%, though it moves county to county — coastal parcels aren't automatically higher or lower, it depends on the local millage rate and assessed value. If this will be your primary residence, the Florida Homestead Exemption knocks roughly $51,000 off your taxable value and caps future increases at 3% or CPI, whichever is lower.

Windstorm and homeowner's insurance

Hazard insurance here runs well above the national average, generally $2,400 to $6,000 or more a year, and coastal exposure is a real driver of where a given home lands in that range. Impact windows, a newer roof, hurricane shutters, or a recent wind mitigation inspection can meaningfully lower the premium — ask for the mitigation report before you assume the worst on an older home.

Flood insurance and base flood elevation

A standard homeowner's policy does not cover flood damage, full stop. If the parcel sits in a FEMA-mapped flood zone, your lender will require a separate flood policy through the NFIP or a private carrier, and even outside the mapped zones I tell buyers to price one anyway — a meaningful share of flood claims come from homes that were never in a high-risk zone on paper. The number that actually drives your premium is the elevation certificate: how many feet the structure sits above or below base flood elevation. Two homes a couple of feet apart in elevation, on the very same street, can land in very different premium brackets. See the Florida flood zones guide for how the zone letters and elevation certificates work together.

HOA and dock or marina dues

Florida carries more HOAs and condo associations per capita than almost any other state, with monthly dues ranging from a modest deed-restriction fee to four figures in a full-amenity building. On the water, also ask whether a dock, lift, or boat slip carries its own separate association or marina fee — that's a cost that never shows up in a standard HOA estimate but belongs in your monthly math if you're buying to keep a boat.

PMI — when it applies and when it comes off

Private Mortgage Insurance kicks in on conventional loans with less than 20% down, generally running 0.3%–1.5% of the loan amount annually. Under the federal Homeowners Protection Act, your lender must automatically drop it once your loan-to-value hits 78% of the original purchase price, and you can request it earlier at 80% LTV if you're current on payments and the home hasn't lost value.

Closing-cost items coastal buyers forget to budget

Beyond the monthly number, plan for these one-time and recurring costs:

• Documentary stamp tax on the deed — $0.70 per $100 of sale price (Miami-Dade is $0.60 plus a $0.45 surtax). On a $450,000 home, that's roughly $3,150.
• Doc stamps and intangible tax on the mortgage — $0.35 per $100 plus 0.002% intangible tax, or roughly $1,980 on a $360,000 loan.
• Title insurance — usually a seller cost in Florida, though it's negotiable, at a promulgated rate of about 0.575% on the first $100K and sliding down from there.
• 4-point inspection — most insurers require one on homes 25 years or older, typically $100–$200.
• Wind mitigation inspection — usually $75–$150, and it often pays for itself in the insurance discount it unlocks.
• Elevation certificate — if the property is in or near a mapped flood zone, get this before you bind a policy, not after. The cost varies by surveyor and lot, but it's the single document that determines your real flood premium.

Frequently asked questions