Free Australian tax & business calculators

Sole trader tax and savings calculator

Turn expected business profit into a tax saving target. Include your other income, subtract tax already paid, and see how much still needs to go into the tax account.

Before you start: Annual planning estimate for an Australian resident adult who is single, has no dependants and is not entitled to the seniors and pensioners tax offset. It is not a payroll withholding or tax-return calculator. This model supports positive business profit; it does not decide whether a business loss can offset other income.

01 / Your numbers

Make it your estimate

All amounts are AUD. An example is loaded; replace it with your figures.

View the current estimate ↓Financial yearAnnual business revenue (AUD)Exclude GST you collect if registered. Enter the full-year estimate, not just sales so far.Annual deductible business expenses (AUD)Exclude GST credits you can claim. Owner drawings and loan principal are not expenses.Other annual taxable income (AUD)For example, gross salary from another job. Enter any tax withheld below.PAYG tax already paid (AUD)Withholding from all jobs plus personal PAYG instalments paid for this year.Money already saved for this year's tax (AUD)Months to build the remaining reserveDo you have a HELP or other study loan?

Super, deductions & Medicare settings

The example assumes full-year qualifying hospital cover and no extra deductions. Check these settings for your circumstances.

Confirmed eligible for the small business income tax offset?Requires aggregated turnover below $5 million and eligible income. PSI that is not from a personal services business is excluded.Deductible personal super contribution (AUD/year)Only contributions you can validly deduct, including the notice-of-intent requirements. The calculator does not establish eligibility.Other personal deductions (AUD/year)Do not repeat expenses already included in business costs.Medicare levy treatmentA private hospital policy does not exempt you from the ordinary Medicare levy.Days without qualifying hospital cover0 means suitable cover for the whole year; 365 means none. Extras-only cover does not qualify. Single, no-dependant surcharge thresholds apply.Reportable fringe benefits (AUD/year)Use the reportable amount, not the cost to your employer. Included in HELP and surcharge income tests.Other income-test additions (AUD/year)Net investment losses and other applicable reportable super or exempt foreign employment income. Do not repeat the voluntary super entered above. The same additions are used for both HELP and the surcharge; special adjustments need separate advice.

Your figures stay in this page. We count tool usage, but never send your amounts to analytics or save them to a server.

02 / Your estimate

Monthly tax saving target

$1,391.11

for the next 9 months

2026-27 financial year

How the estimate adds up

Taxable income: $100,000.00
Income tax before offsets: $20,520.00
Low income tax offset used: $0.00
Small business income tax offset used: $0.00
Income tax after offsets: $20,520.00
Medicare levy: $2,000.00
Medicare levy surcharge: $0.00
HELP / study loan repayment: $0.00
Total tax, levies and study loan: $22,520.00
Tax already paid: $0.00
Balance after payments (negative = estimated credit): $22,520.00
Money already reserved: $10,000.00
Still to reserve: $12,520.00

Read before using this result

The estimate combines business profit and other income. It subtracts only tax already paid and money you have reserved; future PAYG payments are not assumed. GST, business debts and owner drawings need separate cash-flow planning.
For full-year Australian residents aged 18 or over, single with no dependants, and not entitled to SAPTO. Family levy reductions, foreign-resident rates, other offsets and special income are not modelled.
The Medicare reduction uses the published $28,011 individual threshold. A later change to the selected year's threshold could change low-income results.
HELP uses taxable income plus the additions entered. Salary-sacrificed or deductible personal super is added back automatically. Annual debt indexation and future voluntary repayments are not projected.

Profit, drawings and the tax account

A sole trader is taxed on taxable profit and other taxable income, not the amount moved into a personal account. If you leave cash in the business bank account, that does not by itself defer the tax.

Start with a full-year estimate. Keep business costs separate from personal deductions, enter PAYG instalments and salary withholding already paid, then enter what is sitting in your tax savings account. The monthly target spreads the remaining gap over the months you choose.

Why the business offset starts switched off

Eligible unincorporated small businesses can receive an offset of 16% of the income tax attributable to eligible business income, capped at $1,000. It is not 16% of sales or a deduction from profit.

Eligibility and net small business income need checking. The calculator asks for that amount explicitly and starts with the offset off, so a contractor whose income is excluded PSI does not automatically receive it in the estimate.

Keep GST and future payments separate

This target is for personal income tax, Medicare and any modelled study-loan repayment. It does not include your next GST payment, employee PAYG withholding, super or operating bills. Separate savings buckets make the bank balance easier to interpret.

If the business is seasonal, update the full-year forecast after a busy period rather than multiplying one unusually good month by twelve. The result is a planning estimate to discuss with your registered tax agent, not a replacement for a tax assessment.

Your next step

Sources and calculation scope

Rules checked 19 September 2026. These are general planning tools, not personal tax advice. A registered tax agent can check how the rules apply to your business.

Found a calculation that needs checking? Tell us which tool and financial year you used. Please leave out tax file numbers and private financial records.