Useful next calculations
When to use this calculator
- Before accepting a pay change, bonus or contribution arrangement.
- When you want a simple take-home or conversion estimate before payroll or filing.
- When you need to convert between hourly, monthly and annual pay.
- When you want to compare two pay scenarios using the same assumptions.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Amount (NZ$) | NZ$1,000 |
| Calculation Type | Add GST to ex-GST price (exclusive → inclusive) |
| GST Rate | 15% (standard NZ rate) |
For those figures the calculator returns:
- Ex-GST price: NZ$1,000.00
- GST amount: NZ$150.00
- GST-inclusive price: NZ$1,150.00
- GST rate: 15.00%
Common mistakes
- Using an assumption that is not supported by a current local quote, bill, statement or official source.
- Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- Mixing monthly and annual inputs without converting them consistently.
- Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.
Questions people ask
Multiply the ex-GST (exclusive) price by 1.15 to get the GST-inclusive price. The 15% GST component equals the ex-GST price multiplied by 0.15. This calculator does all three steps instantly: enter your ex-GST amount, choose ‘Add GST’, and it returns the GST amount and the final inclusive price.