Local Mortgage Calculator
Plan with a $432,900 city home-value benchmark, a 1.1% property-tax estimate drawn from city-level data for Lake St. Louis, MO, and transparent down-payment and cash-to-close scenarios for Lake St. Louis.
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Local payment snapshot
This mortgage payment calculator in Lake St. Louis, Missouri uses a typical home-value benchmark of $432,900, 20% down, a 6.75% 30-year fixed planning rate, a 1.1% effective property-tax estimate based on city-level data for Lake St. Louis, MO, and a 0.35% annual homeowners-insurance assumption.
City home value
$432,900
Down payment
$86,580
Principal & interest
$2,246/mo
Property tax
$397/mo
Estimated payment
$2,769/mo
Includes $126/mo for homeowners insurance. PMI is $0 with the 20% down assumption.
Home value: August 2026 | Zillow Home Value Index (ZHVI)
The Lake St. Louis home-value benchmark is $165,000 (61.6%) above the $267,900 Missouri benchmark. At 20% down, the local benchmark translates to $86,580 upfront and a $346,320 starting loan balance before closing costs. This comparison helps separate the local price level from the statewide number instead of treating every Missouri market as interchangeable.
Applying the 1.10% effective rate from city-level data for Lake St. Louis, MO to the page's home-value benchmark produces about $4,764 per year, or $397 per month. The rate is 0.04 percentage points below the 1.15% median among the nearby cities on this page. The estimate is useful for budgeting, but a parcel's actual bill can change with assessed value, exemptions, and overlapping taxing districts.
Closing costs are separate from the down payment. Using a planning range of 2% to 6% of the $432,900 benchmark adds approximately $8,658 to $25,974 before moving expenses and cash reserves. Combined with 5% down, that suggests roughly $30,303 to $47,619 in initial cash. At 20% down, the comparable range is $95,238 to $112,554. A lender's loan estimate and the selected property's prepaid taxes, insurance, and HOA charges will determine the actual amount.
These examples hold the $432,900 home-value benchmark, 6.75% planning rate, 30-year term, tax estimate, and insurance assumption constant. That isolates what changes when the down payment changes.
| Down payment | Cash down | Loan amount | Estimated PMI | Estimated payment |
|---|---|---|---|---|
| 5% | $21,645 | $411,255 | $361/mo | $3,551/mo |
| 10% | $43,290 | $389,610 | $361/mo | $3,411/mo |
| 20% | $86,580 | $346,320 | $0/mo | $2,769/mo |
Nearby city comparison
Nearby cities are selected by approximate straight-line distance using U.S. Census Bureau representative coordinates. Each comparison uses that location's own published home-value benchmark, 20% down, the same 6.75% planning rate, and its available city, county, or state property-tax estimate.
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A down payment is only one part of the money due at closing. The examples below combine each down-payment choice with a 2% to 6% closing-cost planning range at the $432,900 benchmark. They do not include moving expenses or the emergency reserves you may want to keep after closing.
| Down payment | Cash down | Closing-cost range | Estimated cash to close |
|---|---|---|---|
| 5% | $21,645 | $8,658-$25,974 | $30,303-$47,619 |
| 10% | $43,290 | $8,658-$25,974 | $51,948-$69,264 |
| 20% | $86,580 | $8,658-$25,974 | $95,238-$112,554 |
Closing costs can include lender charges, title and settlement services, appraisal fees, prepaid taxes and insurance, and initial escrow deposits. Seller or lender credits may reduce the amount paid at closing.
The home-value benchmark comes from the Zillow Home Value Index for August 2026 and is labeled as a city-level figure. The 1.1% effective property-tax estimate uses city-level data for Lake St. Louis, MO from 2024 owner-occupied housing data and is converted to monthly dollars against the same home-value benchmark. Nearby comparisons use representative coordinates and the same payment formula so the direction of the differences is easier to interpret.
Insurance is modeled at 0.35% of home value annually, conventional PMI at 1% annually below 20% down, and principal and interest at a 6.75% 30-year fixed planning rate. These are transparent comparison assumptions, not live quotes. Actual price, parcel taxes, insurance, HOA dues, closing costs, rate, APR, lender fees, and prepaid amounts can differ. This page does not provide financial, legal, lending, or real-estate advice.
Using a $432,900 home-value benchmark, 20% down, a 6.75% 30-year fixed planning rate, a 1.1% property-tax estimate, and a 0.35% annual homeowners-insurance assumption, the estimated monthly housing payment is $2,769. Change the calculator inputs for a personalized scenario.
It uses the $432,900 Zillow Home Value Index benchmark published for Lake St. Louis for August 2026. The Missouri statewide benchmark for the same source is $267,900.
The page applies a 1.1% effective property-tax estimate from city-level data for Lake St. Louis, MO. At the $432,900 benchmark, that contributes about $397 per month or $4,764 per year. A parcel's actual bill can differ because of assessed value, exemptions, and taxing districts.
At the current benchmark, 5% down is $21,645 with an estimated $3,551 monthly payment. At 20% down, cash down is $86,580 and the estimated payment is $2,769, with no conventional PMI included in that example.
At the $432,900 benchmark, a 5% down payment plus a 2% to 6% closing-cost planning range equals approximately $30,303 to $47,619. With 20% down, the comparable range is $95,238 to $112,554. Actual lender charges, prepaid taxes, insurance, escrow deposits, and credits will change the final amount.
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