v2026.2.1

What changed, and when it started

Every rule change, dated to the day it took effect.

Generated from the effective dates on the records themselves — not a hand-kept list, so it cannot fall behind the engine. 48 changes to date, 11 already scheduled.

What we changed6 entries

Everything below this heading is the government’s history: when a rate took effect. This section is ours — when this site started answering for a jurisdiction, and when it got something wrong and fixed it. A calculator that shows its derivations and hides its corrections is making the weaker claim.

  1. 31 Aug 2026 The site went live at its own domain
    chachng.com, registered and connected the same morning, with the www spelling redirecting to it. Until then the site answered only at a hosting platform’s address.     coverage
  2. 31 Aug 2026 KiwiSaver 3% removed from the selectable rates, and the claim that an employer matches a reduced rate withdrawn
    IRD lists 3.5, 4, 6, 8 and 10 per cent; 3% left that list when the default rose on 1 April 2026 and survives only as a temporary reduction you apply for. The employer MAY follow you down to 3% and is not obliged to — the compulsory minimum stays 3.5%. Found because seven source pages had 404’d and the figures had to be read again.     correction
  3. 30 Aug 2026 Stamp duty answers Western Australia, South Australia, Tasmania, the ACT and the Northern Territory
    All eight Australian jurisdictions now share one engine.     coverage
  4. 30 Aug 2026 Victorian and Queensland registration fees corrected, by $1,748 and $2,650 at the top of their scales
    Both were carried as flat fees. Victoria charges $104.30 plus $2.34 per whole $1,000 to a cap; Queensland charges $248.04 plus $46.56 per $10,000 above $180,000, uncapped.     correction
  5. 30 Aug 2026 Duty rounding corrected in six jurisdictions
    The excess over the band floor is rounded up to the next $100 before the rate applies. This engine rounded the whole dutiable value instead, and only for Queensland.     correction
  6. 26 Aug 2026 Five calculators, with stamp duty covering New South Wales, Victoria and Queensland
    The first commit in this repository. Whether the site answered anything publicly before this date is not recorded here, and this list does not guess at it.     coverage

Scheduled11 not yet in effect

  1. 31 Mar 2027 Private health rebate tiers stops applying au.phi.rebate.2026-07-01 privatehealth.gov.au
  2. 31 Mar 2027 ACC earners levy stops applying nz.acc.2026-27 IRD
  3. 31 Mar 2027 ESCT bands stops applying nz.esct.2026-27 IRD
  4. 31 Mar 2027 KiwiSaver rates stops applying nz.kiwisaver.2026-27 IRD
  5. 31 Mar 2027 New Zealand PAYE brackets stops applying nz.paye.2026-27 IRD
  6. 31 Mar 2027 Student loan repayments stops applying nz.student-loan.2026-27 IRD
  7. 30 Jun 2027 HECS repayment thresholds stops applying au.hecs.2026-27 ATO
  8. 30 Jun 2027 Income tax brackets stops applying au.income-tax.2026-27 ATO
  9. 30 Jun 2027 Medicare surcharge thresholds stops applying au.mls.thresholds.2026-27 ATO
  10. 30 Jun 2027 Super guarantee rate stops applying au.super.2026-27 ATO
  11. 30 Jun 2027 Working holiday tax rates stops applying au.whm.rates.2026-27 ATO

202626 changes

  1. 1 Jul 2026 Duty scale takes effect au.duty.act.transfer Taxation Administration (Amounts Payable
  2. 1 Jul 2026 Duty scale takes effect au.duty.nsw.transfer Revenue NSW
  3. 1 Jul 2026 Duty concessions takes effect au.duty.vic.ppr SRO Victoria
  4. 1 Jul 2026 HECS repayment thresholds takes effect au.hecs.2026-27 ATO
  5. 1 Jul 2026 Income tax brackets takes effect au.income-tax.2026-27 ATO
  6. 1 Jul 2026 Medicare surcharge thresholds takes effect au.mls.thresholds.2026-27 ATO
  7. 1 Jul 2026 Lifetime Health Cover loading takes effect au.phi.lhc privatehealth.gov.au
  8. 1 Jul 2026 Median hospital premium takes effect au.phi.median-premium privatehealth.gov.au
  9. 1 Jul 2026 Private health rebate tiers takes effect au.phi.rebate.2026-07-01 privatehealth.gov.au
  10. 1 Jul 2026 Reciprocal healthcare agreements takes effect au.rhca.members Services Australia
  11. 1 Jul 2026 Super guarantee rate takes effect au.super.2026-27 ATO
  12. 1 Jul 2026 Working holiday tax rates takes effect au.whm.rates.2026-27 ATO
  13. 30 Jun 2026 HECS repayment thresholds stops applying au.hecs.2025-26 ATO
  14. 30 Jun 2026 Income tax brackets stops applying au.income-tax.2025-26 ATO
  15. 30 Jun 2026 Medicare surcharge thresholds stops applying au.mls.thresholds.2025-26 ATO
  16. 30 Jun 2026 Private health rebate tiers stops applying au.phi.rebate.2026-04-01 privatehealth.gov.au
  17. 30 Jun 2026 Super guarantee rate stops applying au.super.2025-26 ATO
  18. 30 Jun 2026 Working holiday tax rates stops applying au.whm.rates.2025-26 ATO
  19. 1 Apr 2026 Private health rebate tiers takes effect au.phi.rebate.2026-04-01 privatehealth.gov.au
  20. 1 Apr 2026 ACC earners levy takes effect nz.acc.2026-27 IRD
  21. 1 Apr 2026 ESCT bands takes effect nz.esct.2026-27 IRD
  22. 1 Apr 2026 KiwiSaver rates takes effect nz.kiwisaver.2026-27 IRD
  23. 1 Apr 2026 New Zealand PAYE brackets takes effect nz.paye.2026-27 IRD
  24. 1 Apr 2026 Student loan repayments takes effect nz.student-loan.2026-27 IRD
  25. 31 Mar 2026 Private health rebate tiers stops applying au.phi.rebate.2025-07-01 privatehealth.gov.au
  26. 31 Mar 2026 ACC earners levy stops applying nz.acc.2025-26 IRD

202510 changes

  1. 1 Jul 2025 HECS repayment thresholds takes effect au.hecs.2025-26 ATO
  2. 1 Jul 2025 Income tax brackets takes effect au.income-tax.2025-26 ATO
  3. 1 Jul 2025 Medicare surcharge thresholds takes effect au.mls.thresholds.2025-26 ATO
  4. 1 Jul 2025 Private health rebate tiers takes effect au.phi.rebate.2025-07-01 privatehealth.gov.au
  5. 1 Jul 2025 Super guarantee rate takes effect au.super.2025-26 ATO
  6. 1 Jul 2025 Working holiday tax rates takes effect au.whm.rates.2025-26 ATO
  7. 1 Jul 2025 KiwiSaver government contribution takes effect nz.kiwisaver.government-contribution IRD
  8. 30 Jun 2025 Income tax brackets stops applying au.income-tax.2024-25 ATO
  9. 30 Jun 2025 Medicare surcharge thresholds stops applying au.mls.thresholds.2024-25 ATO
  10. 1 Apr 2025 ACC earners levy takes effect nz.acc.2025-26 IRD

20244 changes

  1. 1 Jul 2024 Income tax brackets takes effect au.income-tax.2024-25 ATO
  2. 1 Jul 2024 Medicare surcharge thresholds takes effect au.mls.thresholds.2024-25 ATO
  3. 30 Jun 2024 Income tax brackets stops applying au.income-tax.2023-24 ATO
  4. 30 Jun 2024 Medicare surcharge thresholds stops applying au.mls.thresholds.2023-24 ATO

20232 changes

  1. 1 Jul 2023 Income tax brackets takes effect au.income-tax.2023-24 ATO
  2. 1 Jul 2023 Medicare surcharge thresholds takes effect au.mls.thresholds.2023-24 ATO

20221 change

  1. 1 Jul 2022 Duty scale takes effect au.duty.wa.transfer RevenueWA

20211 change

  1. 1 Jul 2021 Duty scale takes effect au.duty.vic.transfer SRO Victoria

20191 change

  1. 1 Jul 2019 Medicare levy exemption takes effect au.mes.exemption ATO

20171 change

  1. 1 Jan 2017 Working holiday treaty countries takes effect au.whm.nda-countries ATO

20131 change

  1. 21 Oct 2013 Duty scale takes effect au.duty.tas.transfer State Revenue Office Tasmania

20121 change

  1. 21 Sep 2012 Duty scale takes effect au.duty.qld.transfer Queensland Revenue Office
Visa tax & Medicare exemption Take-home pay and the exemption on a temporary visa Stamp duty Transfer duty in every state and territory Take-home pay From the package offered to what actually lands