From GST and capital gains tax to superannuation, deductions and business cash flow, choose the calculator you need and get a clearer view of the numbers behind your next decision.
Whether you’re planning ahead, reviewing your tax position or considering a business decision, our calculators provide practical estimates based on the information you enter.


Tax and business decisions often involve more than one number. Income, deductions, GST, superannuation, business structure and other factors can all influence the final outcome. Our calculators give you a practical way to estimate key figures before a lodgement deadline, major decision or planning discussion.
Whether you’re checking income tax, reviewing a capital gain, comparing business structures, forecasting cash flow or estimating super contributions, you can choose the calculator that suits your situation. The results provide a useful starting point, while SMH Accountants & Advisors can help you understand what those numbers mean for your broader financial position.
Get clear answers about using our calculators and interpreting the estimates they provide.
Yes. You can use our online accounting and tax calculators to estimate a range of tax, business and financial outcomes.
Our calculators provide estimates based on the information you enter and the assumptions, rates and rules applied within each calculator. Actual outcomes can vary depending on your circumstances and the tax rules that apply at the relevant time.
The calculators can help you estimate certain figures, but they are not a substitute for preparing and lodging a complete tax return or obtaining professional tax advice.
It depends on what you want to calculate. For example, you can use the Income Tax Calculator for an income tax estimate, the CGT Calculator when assessing a capital gain, or the BAS / GST Calculator for GST-related calculations.
Yes. Several calculators are specifically useful for businesses, including the BAS / GST Calculator, Payroll Tax Calculator, Division 7A Calculator, Break-Even Analysis Calculator and Cash Flow Forecast Calculator.
No. The calculators provide general estimates and information only. The results should not be relied upon as personal tax, accounting, financial or legal advice.
If your circumstances involve multiple entities, companies, trusts, investments, property, significant deductions or other complex tax matters, professional advice may provide a more accurate assessment.
Speak with SMH Accountants & Advisors for practical assistance with taxation, accounting, business planning and ongoing compliance.