Useful next calculations
When to use this calculator
- Before buying, renting, refinancing or reviewing a property investment.
- When you want to compare cash flow, tax, yield or ownership costs.
- When you need a fast estimate before speaking to an agent, lender or adviser.
- When you want to see how a rate or price change moves the result.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Property Value (NZ$) | NZ$700,000 |
| Weekly Rent (NZ$) | NZ$550 |
| Annual Expenses — rates, insurance, mgmt (NZ$) | NZ$0 |
| Mortgage Balance (NZ$) | NZ$0 |
For those figures the calculator returns:
- Annual rental income: NZ$28,600.00
- Gross yield: 4.10%
- Net yield: 4.10%
- Net rental income: NZ$28,600.00
- Tax benefit (if loss): NZ$0.00
- After-tax return: NZ$24,687.00
How to read your results
Tax Benefit (if loss)
Review this figure alongside gross income and the local tax rules that apply to you. It is a planning estimate, not a filing result.
After-Tax Return
Review this figure alongside gross income and the local tax rules that apply to you. It is a planning estimate, not a filing result.
Method & assumptions
This residential-rental estimate deducts annual operating expenses and mortgage interest from rent. Interest is fully deductible from 1 April 2025, subject to the general rules. Rental losses are ring-fenced: they do not reduce tax on salary or wages and are generally carried forward against residential-rental income. This tool shows no salary-tax refund for a loss.
Positive net rent is added to the other taxable income you enter using current NZ individual tax brackets. The estimate excludes carried-forward rental deductions, ownership structures, depreciation adjustments, commercial/GST rules and property-sale taxes. The two-year bright-line period for sales from 1 July 2024 is separate from rental cash flow.
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.