Delaware Mortgage Calculator (with Delaware Property Taxes & Insurance)

Delaware routinely appears near the bottom of national property tax rankings, and the gap between Delaware and high-tax neighbors like Connecticut or New Jersey is large enough to change monthly affordability math meaningfully. This calculator applies Delaware's 0.57% effective property tax rate to the home's purchase price, adds a flat monthly homeowners insurance estimate, and produces a full PITI (Principal, Interest, Taxes, Insurance) payment so buyers can see how much of their monthly cost is actually financing versus the comparatively light ongoing carrying cost that draws many retirees and out-of-state buyers to Delaware in the first place.

Delaware's low property tax exists alongside a state income tax, unlike Florida, so the state is not a pure no-tax destination. But for a mortgage payment specifically, the property tax side of the equation is unusually favorable, and this calculator isolates that effect so a buyer comparing Delaware against a higher-tax state can see the monthly dollar difference rather than a vague statement that "Delaware taxes are low."

1. Down payment and loan principal. The down payment percentage is applied to the home price, and the remainder becomes the financed loan principal.
2. Principal and interest. The loan principal amortizes over a standard 360-month (30-year) fixed term using PMT = P × r / (1 − (1 + r)^−n), with r equal to the monthly rate (annual APR divided by 12).
3. Property tax. Delaware's statewide effective average of 0.57% is applied to the full home purchase price and divided by 12 for a monthly escrow figure.
4. Homeowners insurance. A flat $125 monthly estimate is added, representing typical coverage costs, though coastal Sussex County properties near the Delaware beaches often carry higher premiums than inland Kent or New Castle County homes.
5. Total PITI. Principal and interest, monthly tax, and monthly insurance sum to the headline monthly payment.

Using the calculator's baseline inputs: a $380,000 home, 20% down, and a 6.5% 30-year fixed rate.

1. Down payment: $380,000 × 20% = $76,000
2. Loan principal: $380,000 − $76,000 = $304,000
3. Monthly rate: 6.5% ÷ 12 = 0.5417%
4. Principal and interest: amortizing $304,000 over 360 months yields approximately $1,921.49 per month
5. Monthly property tax: $380,000 × 0.57% ÷ 12 = $180.50
6. Monthly insurance: $125.00 flat estimate
7. Total PITI: $1,921.49 + $180.50 + $125.00 = approximately $2,226.99 per month

Compare that $180.50 monthly tax line against the $680.83 a Connecticut buyer would owe on the same $380,000 home. Over a full year, that difference alone is roughly $6,000, money that in Delaware stays available for the mortgage principal, savings, or simply a lower total housing cost.

• County-level rate differences. Delaware's three counties, New Castle, Kent, and Sussex, each set their own local tax rates on top of school district levies, so the 0.57% statewide effective average is a planning figure, not an address-specific quote.
• Delaware's realty transfer tax. A one-time state and county transfer tax applies at closing, separate from the recurring monthly payment modeled here, and can be a meaningful upfront cost that buyers should budget alongside the down payment.
• Coastal insurance premiums. Homes near Rehoboth Beach, Bethany Beach, and other Sussex County coastal areas often carry flood and windstorm coverage costs well above the flat $125 monthly estimate used in this baseline model.
• Private mortgage insurance. This calculator assumes the 20% down payment scenario avoids PMI; a smaller down payment would add a PMI line item not reflected here.
• Delaware state income tax. Delaware pairs its low property tax with a graduated state income tax, which affects overall affordability but is outside the scope of a monthly mortgage payment calculation.

• Assuming Delaware is a no-tax state across the board. Delaware has no sales tax but does levy income tax and property tax, just at property tax rates well below the national average; conflating "low tax" with "no tax" leads to inaccurate total cost-of-living comparisons.
• Using a national average property tax rate instead of Delaware's actual figure. Applying a generic 1.0% or 1.1% national average rate to a Delaware home overstates the monthly tax burden by more than double.
• Overlooking the one-time realty transfer tax at closing. Delaware's transfer tax, split between state and county, is due at closing and is separate from the ongoing monthly property tax modeled in PITI.
• Ignoring county-to-county variation within Delaware. Sussex County beach communities and New Castle County suburbs can carry different effective rates once local levies are included, even though both fall under the same statewide average.
• Skipping insurance cost verification for coastal properties. A flat $125 monthly estimate understates true costs for homes within flood zones near the Atlantic coast, where premiums can run substantially higher.

• Delaware Office of the State Fire Marshal and county assessor offices, county-level property tax rate publications
• Delaware Division of Revenue, realty transfer tax guidance
• Tax Foundation, State and Local Property Tax Rankings (2025/2026)
• Consumer Financial Protection Bureau, Regulation Z and mortgage disclosure standards