Casual, Part-Time and Seasonal Income Mortgages

The two things lenders are testing

With any non-standard income, a lender is answering two questions: is this income consistent enough to rely on, and is it likely to continue? Everything about how irregular income is assessed flows from those two tests.

Consistency is demonstrated by history. Continuity is demonstrated by the nature of the work and the relationship with the employer. If you can show both, most lenders will work with you — though they will usually be conservative about the figure they use.

How much history you need

As a general guide, the less regular the income, the longer the history a lender wants:

These are general patterns rather than fixed rules — each lender sets its own requirements and the variation between them is wide. The figures above are a planning guide, not a policy statement.

Seasonal income: present the whole cycle

Seasonal workers — horticulture, viticulture, tourism, shearing, fishing, and plenty of contracting — have a specific challenge. Income arrives in concentrated periods and the off-season is lean. A lender looking at three months of peak-season payslips sees a figure that is not sustainable across the year.

The way through is to present two full years so the lender can see the complete cycle, including the quiet months, and work out a reliable annual figure. Counterintuitively, including your worst months strengthens the application, because it demonstrates you understand your own income pattern and the averaged figure is credible.

Also worth showing: that you manage the off-season. Bank statements demonstrating you save through the peak and draw down sensibly through the lean period directly address the lender's core worry.

Multiple income sources

Many applicants in this category have more than one stream — a part-time permanent role plus casual shifts, or employment plus a side business. Lenders will often consider all of it, but each stream is assessed on its own terms and the weakest-evidenced stream may be excluded entirely.

Keep the sources clearly separated in your documentation. Income paid into the same account as everything else, with no clear trail, is much harder for an assessor to credit. If you have self-employed income alongside employment, read our guide to self-employed income as well.

Documents to gather

1. Two years of IRD income summaries, available through myIR. These are the most useful single document because they are authoritative and show the full picture.
2. Payslips covering the longest period you can — ideally spanning a full seasonal cycle.
3. Your employment agreement or contract, even for casual work, showing the basis of engagement.
4. A letter from your employer confirming the ongoing nature of the engagement and typical hours, where you can get one.
5. Bank statements for three to six months, showing the income arriving and how you manage between peaks.

Our full NZ mortgage document checklist covers the rest of the file.

The strategic point

Lender appetite for irregular income varies enormously, and it is not a simple bank-versus-non-bank split — some main banks are comfortable with well-evidenced casual income while others are not, and the same is true across the non-bank market.

What that means practically is that a decline from one lender tells you very little about your actual prospects. If your income is irregular, the file needs to be matched to policy before it is submitted. Send us two years of income history and we will tell you where it fits best and what figure lenders are likely to use.

A worked seasonal example

Take a seasonal worker whose income arrives unevenly across the year. Using round illustrative figures:

If this applicant submits four months of peak payslips, the lender annualises something close to $114,000 — then discovers from tax records or bank statements that the real figure is $56,000, and the application loses credibility. If the same applicant submits two years of IRD income summaries showing roughly $56,000 each year, the lender has a reliable figure and a demonstrated pattern.

The second approach yields a lower headline income and a much better outcome. Consistency across two years is worth more than a strong recent run.

Making your bank statements work for you

With irregular income, your statements are doing more than verifying deposits — they are demonstrating that you can manage the pattern. Over three to six months a lender wants to see:

• Deliberate saving through the peak. Regular transfers into a savings account while income is high is the single most persuasive behaviour you can show.
• Controlled drawdown through the lean period. Living off savings rather than credit.
• No dishonours or overdraft reliance in the off-season.
• No short-term or payday lending bridging gaps between seasons.

If your recent statements do not look like this, the fix is behavioural and it takes a few months. That is frustrating if you want to buy now, but it is far more effective than hoping a lender overlooks it — and it is the same pattern we describe in our guide to BNPL on mortgage applications.

Fixed-term contracts and labour-hire arrangements

A particular sub-case worth separating out: workers on fixed-term contracts, or engaged through a labour-hire or recruitment agency. Here the income may be regular and substantial, but the engagement has an end date, which is what concerns a lender.

What strengthens these applications:

1. A history of successive contracts, ideally with the same client or agency, showing the work keeps being renewed.
2. A current contract with as much remaining term as possible.
3. Evidence of demand in your field, and of your own track record of continuous engagement.
4. Where available, a letter from the client or agency indicating intention to renew or extend.

Lender appetite for fixed-term income varies a great deal — some treat a well-established contractor as equivalent to a permanent employee, others apply significant caution. Our contractor case study shows how one of these files was put together.

This article explains how New Zealand lenders generally assess these situations. It is general information, not personalised financial advice, and lender policy changes often — check your own position with a registered adviser. Official sources: Reserve Bank of New Zealand for lending policy and the OCR, and Sorted.org.nz for independent government-backed money guidance.