South Dakota Mortgage Calculator (with South Dakota Property Taxes & Insurance)

South Dakota has no state individual income tax, and property tax is one of the primary ways the state and its counties fund schools and local government as a result. That tradeoff shows up directly in this calculator: the 1.22% effective property tax rate applied here is more than double South Carolina's 0.56% and meaningfully higher than Tennessee's 0.66%, reflecting South Dakota's greater reliance on property tax revenue in the absence of income tax collections.

For a household comparing South Dakota against an income-tax state, the higher property tax bill needs to be weighed against the income tax savings. A South Dakota homeowner keeps 100% of their wage income at the state level, which for many buyers more than offsets a property tax bill that runs a few hundred dollars higher per month than in a state like South Carolina, but the net effect depends heavily on income level and home value.

The mortgage math itself, principal and interest on a 30-year fixed loan, is calculated with the same amortization engine used across every mortgage calculator on this platform. Only the property tax rate and accompanying state context differ from state to state.

1. Down payment and loan principal. Down payment percentage is applied to the home price; the remainder becomes the loan principal.
2. Principal and interest (P&I). The loan principal is amortized over 360 months (30 years) at the entered interest rate:

$$\text{Payment} = P \times \frac{i(1+i)^{360}}{(1+i)^{360} - 1}$$

1. Property tax. Home price is multiplied by South Dakota's 1.22% effective rate and divided by 12 for a monthly figure.
2. Insurance. A flat $125 monthly homeowners insurance estimate is added.
3. Total PITI. Principal, interest, tax, and insurance are summed into the headline monthly payment.

Using the calculator's default inputs:

• Home Price: $380,000.00
• Down Payment: 20% ($76,000.00)
• Interest Rate: 6.5%
• Term: 360 months (30 years)

Step by step:

1. Loan principal: $380,000 − $76,000 = $304,000.00
2. Monthly principal and interest at 6.5% over 360 months: $1,921.48
3. South Dakota property tax: $380,000 × 1.22% = $4,636.00 per year, or $386.33 per month
4. Homeowners insurance estimate: $125.00 per month
5. Total monthly PITI: $1,921.48 + $386.33 + $125.00 = $2,432.81
6. Total interest paid over the full 30-year term: $1,921.48 × 360 − $304,000 = $387,732.80

• Owner-occupied classification discounts. South Dakota offers reduced tax treatment for owner-occupied single-family homes relative to agricultural and commercial property classifications; the 1.22% figure is a statewide approximation, not a county-specific owner-occupied rate.
• County and school district mill levy variation. South Dakota's mill levies are set locally by counties, municipalities, and school districts, and vary meaningfully across the state; 0.56 to 2%+ effective rates are possible depending on location.
• Owner-occupied property tax freeze and relief programs. South Dakota offers property tax relief programs for qualifying elderly and disabled homeowners, which can reduce the effective bill below what this calculator projects for eligible households.
• PMI for down payments under 20%. This calculator does not add private mortgage insurance, which is typically required when the down payment is below 20%.
• HOA dues, well and septic inspection costs, or agricultural exemption nuances. None of these are modeled.
• The offsetting effect of zero state income tax on overall affordability. This calculator only computes the mortgage payment; it does not project take-home pay.

• Assuming South Dakota's overall tax burden is low because there is no income tax. Property tax is comparatively high in South Dakota specifically because it substitutes for income tax revenue; total housing cost should always be evaluated on a PITI basis, not property tax alone.
• Ignoring mill levy differences between counties. A home of identical value in two different South Dakota counties can carry noticeably different tax bills depending on local school and municipal levies.
• Ignoring reassessment cycles. South Dakota counties periodically reassess property values, which can shift your tax bill even when your mortgage rate is fixed.
• Comparing South Dakota's property tax in isolation to income-tax states. A true cost-of-living comparison needs to weigh the property tax difference against income tax savings, not just look at the mortgage payment total.
• Overlooking the down payment threshold for PMI. Below 20% down, expect an additional PMI line item not reflected in this calculator's output.

• South Dakota Department of Revenue: Property tax division and owner-occupied classification guidance.
• South Dakota Department of Revenue: Property tax relief programs for the elderly and disabled.
• Consumer Financial Protection Bureau: Regulation Z mortgage disclosure standards and PMI requirements.
• Tax Foundation: State individual income tax rate comparisons.