New Zealand property investment calculator
Pre-tax cash flow and yield model for an NZ residential rental purchase. Test the deal after a suburb looks plausible — deposit, interest rate, vacancy, expenses, and growth assumptions all hit the same projection.
Anchor the model to a real NZ suburb
Use a large Auckland suburb when you want a baseline NZ metro purchase to test deposit size and repayment pressure.
Drop into a Wellington suburb when you want a second metro reference point with a different rent profile.
- Interest rate and deposit size usually dominate the outcome faster than long-run growth assumptions.
- Weekly rent is anchored to the suburb bond market median where available — treat it as a live assumption, not a permanent truth.
- Annual expenses (rates, insurance, maintenance, property management) are where most NZ back-of-envelope models get unrealistically generous.
- Monthly cash flow tells you whether the hold is painful or self-supporting at current assumptions.
- Net yield here is pre-tax — useful for comparison but lower than the post-tax read after interest deductibility settles.
- The 30-year projection is a sensitivity tool. Move growth and rent inputs to see how fragile the story is.
- Bright-line test and capital gains on early sale.
- Interest deductibility phase-in for newer purchases.
- Ring-fencing of rental losses against other income.
Read the output as a clean pre-tax cash flow study. Bring tax-specific advice from an NZ accountant before treating it as a final decision.
Calculator workspace
Run the model
Pre-tax cash flow, yield, and 30-year hold projection for an NZ residential rental purchase.
This model is still generic. Search a real NZ suburb if you want the weekly rent anchored to the bond market median.
NZ tax treatment (bright-line test, interest deductibility phase-in, ring-fencing) is not modelled. Output is pre-tax cash flow only.
This model is still generic. Search a real NZ suburb if you want the weekly rent anchored to the bond market median.
NZ tax treatment (bright-line test, interest deductibility phase-in, ring-fencing) is not modelled. Output is pre-tax cash flow only.
Four questions about the NZ calculator.
-
What does the NZ property calculator model?
The calculator models purchase price, deposit, loan repayments, weekly rent, vacancy, annual expenses, gross and net pre-tax yield, monthly cash flow, and a 30-year hold projection with capital growth.
-
Does the calculator include NZ tax?
No. NZ residential investment tax is complex (bright-line test, ring-fencing of rental losses, the interest deductibility phase-in). The v1 calculator deliberately shows pre-tax economics only so the basic cash flow read is not muddied by an oversimplified tax model.
-
When should I use the calculator in the QuickProperty workflow?
Use the calculator after rankings or compare has produced a realistic candidate. It is a final pressure-test tool, not the first step for discovering NZ suburbs.
-
Can the calculator start from a real suburb?
Yes. Links from NZ suburb pages and the shortlist workspace preload the region, suburb, and weekly rent from the bond market median. Purchase price still needs your judgment because NZ data does not include a per-suburb house price median in this build.