Calcuris Open Data — Tax & Household Finance Datasets

Open datasets compiled by the Calcuris Data Team, the data layer behind calcuris.com's free tax and finance calculators for the US, UK, Canada and Australia. All datasets are CC BY 4.0 — free to reuse with attribution to calcuris.com.

📊 US Property Tax Rates 2026 — State, County & City (13,241 jurisdictions)

The most granular open compilation of US residential property tax burdens we are aware of: 51 states/DC + 3,132 counties + 10,058 cities (Census places ≥ 2,500 population), each with the effective property tax rate, median annual tax paid, median home value and median household income.

What the data shows:

• New Jersey and Illinois carry the highest effective rates (1.88%); Hawaii the lowest (0.29%).
• New Jersey's median annual property tax bill ($9,590) is more than 12× Alabama's ($788).
• Within a single state, county-level effective rates routinely vary by 3-5×, and city-level rates vary even more — state averages hide most of the story. That is why calcuris.com resolves property tax down to the individual city on its US property tax calculator, with per-state pages like New Jersey.

Method: effective rate = median annual real-estate taxes ÷ median owner-occupied home value (ratio-of-medians, the standard Tax Foundation / SmartAsset method). County and city medians from US Census Bureau ACS 2023 5-year estimates (B25103, B25077, B19013, B01003); state rates from Tax Foundation 2024 as republished June 2026. Thin-data jurisdictions filtered out.

Files: us-property-tax/ · DOI: 10.5281/zenodo.21454886

🇦🇺 Australia Stamp Duty & Income Tax Schedules 2025-27

Machine-readable compilation of the transfer (stamp) duty schedules of all 8 Australian states/territories for 2025-26 — including the concessional schedules most published tables omit (VIC principal-place-of-residence, QLD home concession, ACT income-tested scheme, the NT quadratic formula) — plus the ATO resident income tax system for 2026-27 (brackets, Medicare levy, LITO, marginal HELP/HECS bands, MLS, Superannuation Guarantee).

Official schedules are scattered across 8 revenue office websites in inconsistent formats; this dataset normalises them into flat CSV bracket tables, verified to the cent against each revenue office's own calculator (34/34 checks). They power calcuris.com's stamp duty calculator and income tax calculator.

Files: au-tax/ · DOI: 10.5281/zenodo.21454889

How to cite

More datasets and the full methodology: calcuris.com