Calculation methodology

What FinanceOS calculates

• Australian resident PAYG salary, employer super, tax, Medicare levy, HELP repayment, take-home pay, essential spending, and modelled surplus or shortfall.
• HELP indexation estimates using the visible rate and financial-year assumption.
• User-created scenario comparisons using the assumptions visible in the app.

What FinanceOS does not calculate

• Tax return lodgement outcomes, tax agent assessments, or ATO account balances.
• Personal financial, investment, credit, legal, tax, or superannuation advice.
• Product suggestions, provider rankings, or instructions about actions to take.

Current assumptions

Tax year

2025-26

HELP repayment

$67,000 minimum repayment income threshold; marginal method

HELP indexation

2.8% on 2026-06-01

Medicare levy

Current-law model: $27,222 low-income threshold; $34,027 phase-in limit for single/no-dependants taxpayers.

Budget announced: $28,011 low-income threshold; $35,014 implied phase-in limit, subject to passage of legislation.

Current law still shows $27,222 / $34,027 for a single taxpayer not entitled to SAPTO. Budget announced a 2025-26 uplift to $28,011 from 1 July 2025; the implied full-rate crossover is $35,014 under the 10c-per-dollar taper. The Budget calculator says this increase is subject to passage of legislation, so FinanceOS does not model it as enacted.

Super Guarantee

12% from 2025-07-01

Rounding rules

Model calculations keep decimal precision internally, then round visible currency values where the UI needs whole dollars.

Known exclusions

• Australian resident PAYG model only.
• Medicare levy low-income modelling is for a single taxpayer with no dependants. FinanceOS uses current-law $27,222 / $34,027 thresholds while the Budget announced $28,011 / $35,014 uplift remains subject to passage of legislation.
• Repayment income extras such as reportable fringe benefits and reportable super contributions are not included unless explicitly entered elsewhere in the app.
• The model is general information and does not replace ATO, employer, accountant, adviser, super fund, or provider records.

Official sources

• Australian Taxation Office - resident tax ratesLast reviewed 2026-05-31
• Australian Taxation Office - Medicare levy thresholdsLast reviewed 2026-05-31Current law still shows $27,222 / $34,027 for a single taxpayer not entitled to SAPTO. Budget announced a 2025-26 uplift to $28,011 from 1 July 2025; the implied full-rate crossover is $35,014 under the 10c-per-dollar taper. The Budget calculator says this increase is subject to passage of legislation, so FinanceOS does not model it as enacted.
• Federal Register of Legislation - Medicare Levy Act 1986Last reviewed 2026-05-31Latest compilation at review time used a $27,222 threshold amount and $34,027 phase-in limit for taxpayers not entitled to SAPTO.
• Budget Paper No. 2 2026-27 - Medicare levy low-income thresholdsLast reviewed 2026-05-31Announces a 2025-26 single threshold increase from $27,222 to $28,011 from 1 July 2025.
• Budget 2026-27 tax cut calculator disclaimerLast reviewed 2026-05-31States the 2025-26 Medicare levy low-income threshold increases are subject to passage of legislation.
• Australian Taxation Office - study and training loan repayment thresholdsLast reviewed 2026-05-31
• StudyAssist - 2026 study loan indexationLast reviewed 2026-05-31
• Australian Taxation Office - study and training loan indexation ratesLast reviewed 2026-05-31
• Australian Taxation Office - Super Guarantee percentageLast reviewed 2026-05-31