Gulf Coast House Payment Calculator
See what a home really costs per month — the full payment, including the coastal wind and flood insurance national mortgage calculators leave out.
Want real numbers for a specific home?
Lacey can pull the actual property-tax figures for a specific address, so you are budgeting from real numbers instead of county averages before you make an offer.
Lacey Perniciaro, REALTOR® · (228) 239-0958Coastal Realty Group (Gulfport, MS) · (228) 280-8026
Why your Gulf Coast mortgage payment is higher than the calculator says
Every national mortgage calculator — Zillow, NerdWallet, Bankrate — plugs in a generic homeowners-insurance figure, usually around 0.35% of the home's price, and stops there. On the Mississippi Gulf Coast that's only a fraction of the real cost. Coastal homes carry three separate insurance lines: standard homeowners, a separate wind/hail policy (often through the state wind pool), and flood coverage through the NFIP. Together those run about $3,800 a year on a typical $300,000 Biloxi home in an AE flood zone, and several times that on the water — money a national calculator never shows you, so the monthly payment it quotes can be hundreds of dollars low.
What "PITI" actually includes here
Your true monthly payment is principal, interest, taxes, and insurance (PITI). The principal-and-interest piece works the same everywhere. It's the insurance piece that's different on the coast — and it's why budgeting from a national tool sets buyers up for a surprise at closing. The calculator above uses Mississippi and Louisiana coastal insurance rates, so the number you see is the number you'll actually budget. Relocating from another metro? See how far your overall budget stretches here with our Gulf Coast cost of living comparison →
True monthly payment: FAQ
How much is flood insurance on a Gulf Coast home?
It depends almost entirely on the flood zone. On the Mississippi Gulf Coast, measured from 28,552 Mississippi coast NFIP policy terms in force in 2025 and 2026, the middle high-risk AE policy ran $1,559 a year and the middle waterfront VE policy ran $1,795, with one in ten above $3,643. An inland X-zone policy ran about $1,084 and is not federally required. Your own premium is priced per property, so get a quote. Estimate yours with our flood insurance calculator →.
Why is there a separate wind policy?
Most coastal Mississippi and Louisiana homeowners policies carve wind/hail out as a separate policy, often through the state wind pool (MWUA in Mississippi). It's typically the single largest insurance line on a coastal home.
Does a bigger down payment lower these costs?
It lowers your principal and interest, but insurance and taxes are based on the home's value and location, not your loan — so they don't shrink with a larger down payment. That's why they're easy to under-budget.
Is this a PITI calculator?
Yes — PITI stands for principal, interest, taxes, and insurance, the four parts of a real monthly mortgage payment. This calculator computes all four, and breaks the insurance piece into the three separate lines a coastal home actually carries: homeowners, wind, and flood.
Can I use this as a Mississippi mortgage calculator?
Yes. It defaults to Mississippi rates and coastal insurance — including the state wind pool (MWUA) and NFIP flood premiums Mississippi lenders escrow — and it works for Louisiana and every other state too.
How we calculate this
Principal & interest
Standard amortization from your price, down payment, interest rate, and term.
Property tax
Mississippi counties tax their own value of a house, not the price you pay, and on the coast that value runs well under the sale price. We figure the tax on the county’s value (about 55% of the price on the Mississippi coast, the median across recent sales we matched to county records) at 125.5 mills. A primary home gets homestead once you own and live in it on January 1 and file by April 1. With homestead it is assessed at 10% of that value, and the tax is cut by a credit of up to $300. Without homestead, as with a second home or rental, a home is assessed at 15% of that value, with no credit. For a primary home the monthly total assumes homestead is filed, and the figure without it is shown beside it. After a sale the county can raise its value, so the real bill can run higher. For other states the tool assumes 0.7% of the price. You can type your own rate in the advanced options. We apply the same tax to both the "true" and "national" figures, so the headline gap reflects insurance alone.
Insurance
Homeowners, wind, and flood are estimated with the same coastal insurance engine that powers our flood insurance calculator, calibrated against verified MS Gulf Coast policy data. The "national calculator" comparison uses a generic homeowners-only assumption — about 0.35% of home value, with no wind or flood, the homeowners-insurance default that mainstream tools such as Zillow's mortgage calculator apply.
What this doesn't include
HOA or condo dues, PMI on low-down-payment loans, and closing costs aren't in the monthly figure. Every number is an estimate for budgeting — talk to a local expert (that's Lacey) and a licensed insurance agent for binding quotes.