Regulatory sources

Every rate this site uses comes from the authority that publishes it. 11 rule sets citing 11 source documents, each with the period it applies to and the date it was retrieved.

This page is generated from the same rule sets the calculators resolve against, so a citation here is the citation behind the answer — not a separate list that can drift away from it.

Sources last checked: 2026-08-30.

Commonwealth

Income tax · 1 July 2024 to 30 June 2026
Income Tax Rates Act 1986 (Cth), Schedule 7 Part I — Resident taxpayers
Office of Parliamentary Counsel (Commonwealth) · retrieved 2026-08-30
Verified 2026-08-30
Income tax · 1 July 2026 to 30 June 2027
Income Tax Rates Act 1986 (Cth), Schedule 7 Part I — Resident taxpayers
Office of Parliamentary Counsel (Commonwealth) · retrieved 2026-08-30
Verified 2026-08-30
Income tax · 1 July 2027 onwards
Income Tax Rates Act 1986 (Cth), Schedule 7 Part I — Resident taxpayers
Office of Parliamentary Counsel (Commonwealth) · retrieved 2026-08-30
Verified 2026-08-30
Medicare levy · 1 July 2026 onwards
Medicare Levy Act 1986 (Cth), sections 3(1), 6 and 7
Office of Parliamentary Counsel (Commonwealth) · retrieved 2026-08-30
Verified 2026-08-30

Australian Capital Territory

Transfer duty (stamp duty) · 1 July 2026 onwards
Taxation Administration (Amounts Payable—Duty) Determination 2026 (DI2026-155)
ACT Parliamentary Counsel · retrieved 2026-08-30 · published 2026-06-26
Verified 2026-08-30

New South Wales

Transfer duty (stamp duty) · 1 July 2026 to 30 June 2027
How to calculate transfer duty — current thresholds and rates
Revenue NSW · retrieved 2026-08-30 · published 2026-08-19
Verified 2026-08-30

Northern Territory

Transfer duty (stamp duty) · 1 July 2025 onwards
Stamp Duty Act 1978 (NT), Schedule 1 clause 1 — Conveyances
Northern Territory Government · retrieved 2026-08-30
Verified 2026-08-30

Queensland

Transfer duty (stamp duty) · 1 July 2024 onwards
Transfer duty rates
Queensland Revenue Office · retrieved 2026-08-30
Home concession
Queensland Revenue Office · retrieved 2026-08-30
Verified 2026-08-30

Tasmania

Transfer duty (stamp duty) · 21 October 2013 onwards
Duties Act 2001 (Tas), section 29 — General rate
Parliament of Tasmania · retrieved 2026-08-30
Verified 2026-08-30

Victoria

Transfer duty (stamp duty) · 1 July 2021 onwards
Land transfer duty — non-principal place of residence (current rates)
State Revenue Office Victoria · retrieved 2026-08-30
Land transfer duty — principal place of residence (current rates)
State Revenue Office Victoria · retrieved 2026-08-30
Verified 2026-08-30

Western Australia

Transfer duty (stamp duty) · 7 May 2026 onwards
Transfer duty assessment — rates of duty
Department of Treasury and Finance (RevenueWA) · retrieved 2026-08-30 · published 2026-07-30
Verified 2026-08-30

Where there is no source

South Australia — transfer duty is not calculated

Every South Australian government source for the conveyance duty schedule — RevenueSA, the South Australian legislation register, and the third-party legal databases carrying the relevant Act — was checked, and the schedule could not be retrieved and verified.

Duty on a property purchase is a five-figure statutory liability. An unverified scale would produce a number that looks exactly as authoritative as the verified ones and might be wrong, which is worse than producing nothing. So the calculator returns no result for South Australia and explains why.

The other seven states and territories are implemented against their own published schedules, listed above. If the South Australian schedule becomes verifiable, it will be added with the same provenance as the rest.

How a source becomes a rule

A production rule set must cite at least one primary source — the authority’s own publication of the rule, not a summary of it or an article about it. Supporting sources can corroborate a rule but cannot establish one.

Source URLs must be HTTPS. A citation retrieved over plain HTTP can be rewritten in transit, which would defeat the purpose of naming an authority at all.

The dates a document states for itself are recorded separately from the interval encoded in the rule set, so a disagreement between what the source says and what was encoded is visible rather than quietly reconciled.

Nothing is fetched at runtime. These documents were read, the rules were transcribed and reviewed, and the result is version-controlled — so a calculation never depends on a website being up, and a page changing under a rule that still cites it is detectable rather than silent.

The full methodology