Contractors face extra scrutiny from NZ banks compared to salary employees — but approval is entirely achievable with the right documentation and preparation. The key is understanding exactly what income evidence each lender requires and starting that preparation well in advance.
NZ banks typically require 2 years of verified contracting income to approve a mortgage. Your borrowing capacity is based on your average net income over those two years — not your day rate. A mortgage broker who specialises in self-employed lending significantly improves your approval chances and knows which lenders are most flexible on contracting structures.
How Banks Assess Contractor Income
For salaried employees, income verification is straightforward: payslips and an employer letter. For contractors, it’s more complex because income can vary year to year and the business structure affects how income is treated.
Banks typically request:
- Two most recent years of IR3 (sole trader) or IR4 (company) tax returns
- Financial statements prepared by a chartered accountant for both years
- Year-to-date trading figures for the current income year
- Business bank statements (3–6 months)
- Copies of current contracts or evidence of ongoing client engagements
The qualifying income is typically the average of the past two years’ net income, not the gross contract rate. If Year 1 net income was $80,000 and Year 2 was $120,000, most banks use $100,000 as the qualifying figure.
If the most recent year is significantly higher, some banks — particularly those with specialist self-employed assessment teams — will consider using the most recent year’s figure as a demonstrated rising trend. A mortgage broker will know which lenders take this approach.
The 2-Year History Requirement
The standard requirement across all major NZ banks is two years of self-employment or contracting history. Banks want an established income pattern, not a single year that may not be representative.
Exceptions exist for:
- Contractors who moved from employed roles in the same field (demonstrating continuity of skill and earning capacity)
- Those with a long-term confirmed contract with a reputable client
- High-income earners at conservative LVR (50%–65%) — risk is lower, so requirements may flex
If you have less than 12 months of contracting history, your realistic options are:
- Using a non-bank lender that applies different income criteria (though at a higher rate)
- Waiting until you have 12–24 months of established income and financial statements
- In some cases, combining prior employment income with current contracting evidence — complex, broker guidance essential
Business Structures and How Banks Treat Them
Sole trader Income is trading revenue less legitimate business expenses. Banks use net income from the IR3 return. The simplest structure for mortgage purposes.
Limited liability company Banks assess the combination of your shareholder salary plus dividends. If profits are retained in the company rather than drawn as salary or dividends, some lenders will add those retained earnings back — but they need your accountant to formally document and confirm this approach.
Partnership Your share of partnership income as shown in the IR7 return and any partnership agreement. Banks typically use your allocated share of net partnership income.
Look-through company (LTC) Retained income that flows through to your IR3 return is included. Your accountant needs to clearly document the flow-through treatment and confirm the figures.
Which NZ Banks Are Most Flexible for Contractors?
All five major banks will consider contractor applications. Kiwibank has historically been noted as somewhat more willing to engage with self-employed cases. ANZ and ASB both have dedicated specialist income teams that process complex self-employed files.
Non-bank lenders — including Resimac, Liberty Financial, and Avanti Finance — can assess contractor income with more flexibility than major banks. One year of strong contracting history may suffice with these lenders, though rates will be higher.
The most important factor is your mortgage broker. Brokers who regularly work with self-employed clients know which lenders are most receptive at any given time, which assessors handle complex income files well, and how to structure the application to minimise back-and-forth.
Preparation Checklist for a Contractor Mortgage
12+ months before applying:
- File all IRD returns on time, every year
- Engage a chartered accountant — their professional sign-off carries real weight with banks
- Keep business and personal bank accounts strictly separate
- Avoid unexplained large transfers between accounts
3–6 months before applying:
- Compile 2 years of IR3/IR4 returns, 2 years of accountant-prepared financials
- Get a current-year-to-date income summary from your accountant
- Reduce credit card limits and pay down personal debt
- If you have current contracts, retain copies
At application:
- Use a mortgage broker with a track record in self-employed lending
- Be transparent about income variations — banks can identify inconsistencies in documentation and undisclosed issues damage credibility
- Prepare a brief written explanation of your business if income structure is unusual
How Much Can a Contractor Borrow in NZ?
The DTI 6× cap applies to contractors the same as to salary earners. On a qualifying gross income of $100,000 (averaged from two years of tax returns), the theoretical borrowing limit is $600,000, subject to a serviceability stress test at approximately 7.5%–8.5%.
Banks will confirm that your average income — not your best year — covers repayments at the stress test rate after all assessed living expenses.
Frequently Asked Questions
How many years of contracting history do I need for a NZ mortgage?
The standard is 2 years of verified contracting income, supported by two years of IRD tax returns and accountant-prepared financial statements. Some lenders will consider 1 year for contractors who moved from employment in the same field, or where a long-term contract and conservative LVR apply.
How does a bank calculate qualifying income for a contractor mortgage?
Banks typically average net income over the past 2 years, using IRD returns and accountant financials. Some lenders will use the most recent year’s income figure where it is higher and represents a clear upward trend — but this requires documentation and lender flexibility.
Can I use my day rate to calculate borrowing capacity?
No. Banks use verified net income from tax returns, not annualised day rates. A $600/day rate might suggest $150,000 gross annually, but if you only work 200 days and have $20,000 in business expenses, your qualifying income is $100,000.
Do contractors pay higher mortgage rates in NZ?
Not at major banks — if you qualify, you pay standard rates. Higher rates only apply if you need a non-bank lender due to less than 2 years’ history or income documentation challenges.
Should I use a mortgage broker as a contractor?
Yes — strongly recommended. Brokers who specialise in self-employed clients know which lenders are currently most flexible on contracting structures, prepare your application to maximise approval chances, and avoid the credit score damage of multiple bank applications.