Property Investment Calculator New Zealand 2025/26
Calculate rental yield, after-tax cash flow with interest deductibility phasing, and check your bright-line tax exposure. NZ has no CGT — hold 2+ years and your gain is tax-free.
Try another scenario
How to Use This Calculator
Tab "Rental Yield"
Enter your purchase price, weekly rent (NZ rental market always quotes rent weekly), and annual expenses including council rates, landlord insurance, maintenance, and property management fees. The calculator shows gross yield (before expenses) and net yield (after expenses), along with your annual rental income.
Tab "Cash Flow & Tax"
Enter your annual rental income (auto-populated from weekly rent × 52), mortgage interest (interest only — principal repayments are not deductible), other expenses, your other taxable income (salary etc.), and select your property type to apply the correct interest deductibility percentage. The calculator shows taxable rental income, the ring-fencing rule in action, and your after-tax cash flow for 2025/26.
Tab "Bright-Line Test"
Enter your purchase and sale dates along with purchase price, expected sale price, and your other income. The calculator determines which bright-line period applies (2, 5, or 10 years depending on when you bought), whether you are within it, and if so, the tax payable on your gain. If you are outside the bright-line period, the result is simple: $0 tax — no CGT in New Zealand.
The Formulas
Annual rental income = Weekly rent × 52
Gross yield (%) = Annual rental income ÷ Purchase price × 100
Net yield (%) = (Annual rental income − Annual expenses) ÷ Purchase price × 100
Interest deductibility phasing (existing residential rentals):
2023/24: 0% deductible
2024/25: 50% deductible
2025/26: 80% deductible
From 1 April 2026: 100% deductible
New builds: 100% deductible at all times
Taxable rental income (2025/26, existing property):
Deductible interest = Mortgage interest × 80%
Taxable rental income = Rental income − Deductible interest − Other expenses
If negative → ring-fenced loss (cannot offset salary income)
After-tax cash flow:
Pre-tax cash flow = Rental income − Full mortgage interest − Other expenses
Additional tax = Tax(salary + rental profit) − Tax(salary alone)
After-tax cash flow = Pre-tax cash flow − Additional tax
Bright-line test:
Holding period = Sale date − Purchase date
If holding period < bright-line period → gain taxed at marginal rate
If holding period ≥ bright-line period → $0 tax (no CGT)
Tax on gain = Tax(other income + gain) − Tax(other income)
All rules from Inland Revenue (IRD) for the 2025/26 tax year (1 April 2025 – 31 March 2026). Bright-line rules from the Tax Relief (Budget Measures) Act 2024.
Example: $750,000 Auckland Investment Property
Investor buying $750K property, $550/week rent, $500K mortgage at 6.5%
Sarah is an Auckland investor earning $90,000 salary. She purchases a $750,000 existing residential rental property with a $500,000 interest-only mortgage at 6.5% per annum. The weekly rent is $550. This is the 2025/26 tax year.
Cash flow & tax (2025/26):
Sarah is cash-flow negative — she must fund a $1,325/month shortfall from her salary. The ring-fenced rental loss of $9,400 carries forward to offset future rental profits. From April 2026, when full 100% interest deductibility is restored, the tax position improves significantly. If the property grows to $900,000 and Sarah sells after 2 years — zero tax on the $150,000 gain (no CGT in NZ).
NZ Property Investment Key Facts 2025/26
| Item | Detail |
|---|---|
| Capital gains tax (CGT) | None — NZ has no CGT on residential property |
| Bright-line test (purchased ≥ 1 Jul 2024) | 2 years — gain taxed if sold within 2 years of purchase |
| Bright-line test (purchased 27 Mar 2021 – 30 Jun 2024) | 10 years |
| Bright-line test (purchased before 27 Mar 2021) | 5 years |
| Main home exemption | Bright-line does not apply to your main home (conditions apply) |
| Interest deductibility — existing rentals 2025/26 | 80% of mortgage interest is deductible |
| Interest deductibility — new builds | 100% at all times |
| Interest deductibility — from 1 Apr 2026 | 100% for all residential rentals |
| Ring-fencing | Rental losses cannot offset salary/other income — carry forward |
| Depreciation on buildings | Not allowed for residential buildings |
| LVR limit (investors) | 70% max LVR — 30% deposit required (RBNZ) |
| LVR limit (owner-occupiers) | 80% max LVR — 20% deposit required (RBNZ) |
| NZ tax brackets | 10.5% / 17.5% / 30% / 33% / 39% |
| GST on residential rent | Exempt — no GST on residential rental income |
| Property management fees | Fully deductible (typically 7–10% of gross rent) |
No CGT = Massive NZ Advantage for Property Investors
New Zealand's absence of a general capital gains tax is one of the most significant financial advantages available to NZ property investors. In most comparable countries — Australia, UK, Canada, US — property investors pay CGT on the appreciation of investment properties at rates ranging from 15% to 45%.
In New Zealand, if you hold a residential investment property for more than 2 years (for properties purchased from 1 July 2024), all capital appreciation is 100% tax-free. On a $750,000 property that grows to $950,000 over 5 years, that is a $200,000 tax-free gain. In Australia, the same investor would pay approximately $46,500 in CGT (at the 50% discount rate and a 46.5% marginal rate). In New Zealand: zero.
This structural advantage means NZ property investors can focus on long-term capital growth without the drag of capital gains tax — making holding periods and compounding growth significantly more powerful than in most peer economies.