KiwiTools collection
Property tools NZ
Plan the numbers around buying, owning or investing in New Zealand property. Each guide separates arithmetic from lender decisions and uncertain market assumptions.
Ready to use
Live tools
Property rates calculator NZ
Turn annual council rates into a regular budget and forecast scenario.
Open tool LiveRental yield calculator NZ
Calculate gross and net yield with vacancy and operating costs.
Open tool LiveHome buying costs calculator NZ
Build an itemised deposit, buying-cost and settlement cash target.
Open tool LiveFirst-home buyer calculator NZ
Compare available funds with a deposit, buying costs and mortgage estimate.
Open tool LiveHouse affordability calculator NZ
Test a home price against your deposit, household budget and buffered repayments.
Open toolGuides available now
Tools in development
Each permanent page explains the intended tool, inputs, method, example and limitations. Interactive results will be added only after testing.
Borrowing power calculator
Explore an indicative loan range from household income, commitments and a test interest rate.
Read tool guideHouse deposit calculator
Calculate a deposit amount, resulting loan and LVR from a target property price.
Read tool guideRent vs buy calculator
Compare the modelled cash costs and asset position of renting with buying over a chosen period.
Read tool guideProperty investment calculator
Model rental cash flow, financing costs and an indicative return for a residential property scenario.
Read tool guideUsing these tools
Plan the costs of buying, owning or investing in NZ property
Property decisions involve more than a purchase price. These tools separate deposits, settlement cash, council rates, mortgage estimates and rental assumptions so each part can be reviewed instead of hiding everything inside one headline number.
First-home and home-buying calculations
A deposit calculator or affordability scenario should leave room for legal work, reports, inspections, valuation, moving expenses and other purchase costs. The accepted property value may also differ from the offer price. First-home buyer and house affordability tools therefore provide planning scenarios, not confirmation of finance or scheme eligibility.
Property rates are an ongoing ownership cost rather than part of the mortgage principal. Convert the current council rates amount into the same weekly, fortnightly or monthly period used by your budget, and keep insurance, maintenance and body-corporate charges visible as separate items.
Rental yield and investment scenarios
Gross rental yield compares annual rent with property value or purchase price, while net yield deducts selected operating costs. Neither measure automatically includes finance, income tax, vacancy, major repairs, purchase costs or changes in property value unless the calculator explicitly asks for them.
Test conservative and higher-cost cases instead of relying on one forecast. Rent, vacancy, interest rates, insurance, maintenance and resale value can change, and legal or tax treatment depends on current rules and individual circumstances. Use a result to organise questions for qualified advisers, lenders and property professionals.
Build a more complete property budget
- Separate the deposit from buying and settlement costs.
- Use current rates, insurance and maintenance estimates.
- Include vacancy and operating costs in rental comparisons.
- Treat borrowing capacity and future values as uncertain scenarios.