AcreMath · All states

Illinois land underwriting

Not legal or tax advice

Property tax rules

Rules used: Generic national rules.

Assessment

  • Assessment ratio defaults to 100%; enter the county's ratio or assessed value if different.

Source: AcreMath generic national property-tax model (as of 2026-10-12)

Rates

  • Generic national rules: annual tax = taxable value × the combined rate you enter (from the county tax bill or rate sheet).

Source: AcreMath generic national property-tax model (as of 2026-10-12)

Exemptions

  • No statewide exemption amount is applied. Enter dollar exemptions from the county tax bill.

Source: AcreMath generic national property-tax model (as of 2026-10-12)

Ag/special use

  • No state-specific delinquency penalties or special-use rollback are applied.

Source: AcreMath generic national property-tax model (as of 2026-10-12)

Delinquency

  • No state-specific delinquency penalties or special-use rollback are applied.

Source: AcreMath generic national property-tax model (as of 2026-10-12)

How it works: methodology.

County registry (102 counties)

Counties and equivalents from the Census 2020 (national_county2020.txt). Start a deal in any county.