Do Overtime and Bonuses Actually Count Toward Your Mortgage Income?
A quick heads-up before we dive in: This article is strictly for general informational purposes and does not constitute financial, legal, or tax advice. Every situation is entirely unique, and bank lending policies change frequently. Before making any decisions about your property journey, it is highly recommended that you seek independent advice from a qualified financial adviser.
You are putting in the hard yards. You are picking up weekend shifts, hitting your sales targets to earn commissions, and taking on extra overtime to build up your house deposit.
When you look at your year-to-date earnings, the number is looking incredibly strong. But when you sit down to apply for a mortgage, will the bank actually look at that final, higher number, or will they only lend to you based on your flat base salary?
The short answer is: Yes, extra income absolutely counts—but the banks do not treat it the same way they treat your base salary.
If you rely on overtime, bonuses, or commissions to boost your take-home pay, here is a high-level, straightforward guide to how New Zealand lenders calculate variable income, and what you need to prove to get it across the line.
The Bank's Perspective: Consistency is King
When a credit assessor reviews your income, their primary goal is to ensure that you can safely afford your mortgage repayments not just today, but for the next 30 years.
Your base salary is viewed as guaranteed, reliable income. The bank knows that unless you lose your job, that money is hitting your account every week.
Variable income, like the overtime you did once last Christmas, or a one time bonus is viewed as a "nice to have," but inherently risky. If the economy slows down and your company cuts overtime, or if you have a bad quarter and miss your sales targets, that income vanishes. Therefore, to get a bank to accept variable income, you must prove historical consistency.
Overtime: The Timeline Rules
If you work in a job where overtime is practically a permanent feature of the role (like nursing, policing, or certain trades), banks are generally very happy to include it in your affordability calculations. However, they need to see a proven track record.
Different banks have entirely different timeline rules for how they calculate overtime:
The 3-Month Rule: A small handful of highly flexible lenders might only ask to see your last three months of bank statements to prove that overtime is a consistent, reliable part of your pay cycle. In their mind, the overtime you did 9 months ago, isn’t relevant to today.
The 6-Month Average: Some lenders will look at your earnings over the last six months and take an average of your overtime to find a realistic baseline.
The 12-Month Standard: Most major mainstream banks take a highly conservative approach. They will want to look at your full year of earnings (usually by requesting your summary of earnings from the IRD) to ensure the overtime isn't just a temporary seasonal spike.
Note: If your overtime is purely seasonal (like working extra hours only over the Christmas retail rush), some banks will strip it out of their calculations entirely.
Bonuses vs. Commissions: The Crucial Difference
While they both feel like extra cash in your pocket, banks treat performance bonuses and sales commissions differently.
Commissions (Sales and Targets)
If a large chunk of your income relies on your personal sales performance, the bank views this as highly volatile. Because your performance can fluctuate wildly from month to month, banks usually require a much longer history—often wanting to see a consistent two-year track record of commission earnings before they will include it. Even then, they will sometimes "shade" (reduce) the commission amount by a certain percentage to build in a safety buffer.
Bonuses (Company Performance)
Annual or quarterly bonuses are often tied to the overall financial performance of the company, rather than just your personal output. Because a company could have a bad year and cancel bonuses entirely, banks are extremely cautious here. They will typically want to see a minimum two-year history of you receiving the exact same (or increasing) bonus from the exact same employer. If it was a one-off sign-on bonus, it will not be counted toward your ongoing servicing capacity.
What About Allowances?
Many Kiwis receive allowances as part of their employment package—such as a vehicle allowance, tool allowance, or shift/living allowances.
Whether these count toward your mortgage affordability depends entirely on the type of allowance and the specific lender:
Taxable Allowances: Things like shift allowances or standard vehicle allowances that are taxed as normal income are often accepted by the bank, provided they are permanent and ongoing.
Reimbursement Allowances: If you receive a non-taxable allowance specifically to reimburse you for out-of-pocket work expenses (like paying for your own tools or petrol), the bank will generally ignore it. That money is meant to cover an expense, not pay a mortgage.
How Home Loan Factory Can Help
If your income is made up of multiple moving parts, going directly to a single bank can be a massive gamble. Because every lender has entirely different timeline rules for overtime and unique calculation methods for commissions, a "no" from one bank could easily be a "yes" from another.
At Home Loan Factory, we know the exact lending policies of every major bank and non-bank lender in New Zealand. We look at your payslips and strategically match your specific income structure to the lender who will treat your overtime and bonuses the most favorably, maximizing your borrowing power without the stress of being declined.
Does your pay packet include overtime, commissions, or allowances? Get in touch with the team at Home Loan Factory today to find out exactly how much a bank will let you borrow.
