Disclosure: I built and maintain What in the Tax? through Eversko. It is free and open source; this is self-promotion.
The directory lists all 444 current Ontario municipalities. In the current build, 436 have at least one usable Financial Information Return (FIR) filing from 2023–2025; the other eight are shown as data gaps rather than estimated. The 436 figure does not mean every municipality has complete coverage for every year or field.
Separately, six communities have clearly labelled 2026 draft/sample receipt models derived from public municipal budget documents and tax bylaws. Those six models are the synthetic/mock component referenced in the title. They are not official tax bills, audits, or tax advice.
I’m looking for one focused provenance test: choose a municipality, open one figure, and follow its citation to the original record. Please tell me the municipality and figure, where the label, reporting year, source, formula, or navigation first becomes unclear, and what evidence you expected next.
Original Ontario FIR archive:
https://efis.fma.csc.gov.on.ca/fir/index.php/en/year-municipality/
Ontario Data Catalogue record and licence:
https://data.ontario.ca/dataset/financial-information-return-fir-for-municipalities
Live explorer:
Code, processed artifacts, and methodology:
https://github.com/Jstn-1g/what-in-the-tax
Please do not share private tax documents, account numbers, addresses, or personal financial information. Even one broken or confusing source trail would be useful.
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