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I'm looking at my first mortgage. My contract income is uneven: some months are busy and others are quiet. What sort of loan setup should I consider so the repayments don't catch me out?
If your income goes up and down from month to month, I’d look for a mortgage that gives you predictable minimum repayments, flexibility when you have a good month, and a cash buffer for the quiet ones.
In New Zealand, you don't necessarily need a special mortgage for contract income. The key is choosing a structure that matches your cash flow, rather than one that only works when you're earning at your busiest.
Three mortgage setups worth considering
1. Fixed-rate mortgage with a manageable repayment
Good for stability
You lock in an interest rate for an agreed period, making your required repayments more predictable during that time.
- Best for: Knowing your essential housing costs in advance.
- Watch out for: Fixed loans can limit extra repayments, and breaking a fixed term may incur costs.
2. Split mortgage: fixed plus floating
Good for flexibility
Put most of the mortgage on a fixed rate and a smaller portion on a floating rate, which generally allows more flexible extra repayments.
- Best for: Keeping your core payments steady while putting surplus contract income towards the loan.
- Watch out for: Floating rates are usually higher than fixed rates, although this varies. Check fees and conditions.
3. Revolving credit or offset mortgage
You may be able to use savings or money sitting in your transaction account to reduce the interest charged on some or all of your mortgage balance.
- Best for: Contractors with irregular invoice payments and enough discipline to keep surplus cash available.
- Watch out for: Revolving credit can behave like a large overdraft. If you keep spending the available funds, the debt may not fall as planned.
The setup I’d investigate first
For a first-home buyer with uneven contract income, I’d compare a split mortgage with a fixed portion and a smaller floating or offset portion against a revolving-credit mortgage.
- If you want peace of mind, lean towards the split mortgage.
- If you have strong savings, good financial discipline and large swings in income, investigate revolving credit or offsetting.
- Whichever you choose, keep enough cash available to cover quiet months rather than committing every good month to extra repayments.
These options have different repayment rules and interest-rate risks. Sorted NZ explains the trade-offs in its mortgage types guide. Types of mortgages in New Zealand, and how to choose » SortedExplaining different types of home loansRevolving mortgage - Giving you flexibility
How to stop repayments catching you out
- Budget from a quiet month, not a peak month. Work out what you can afford after tax, business expenses, ACC levies, income tax obligations and ordinary living costs.
- Build a mortgage buffer. Aim to keep several months of essential expenses and mortgage payments readily accessible, with the right amount depending on how unpredictable your contracts are.
- Separate tax money from spending money. If you invoice clients directly, don't treat the full payment as money available for your mortgage.
- Stress-test the repayments. Check whether you could still afford the loan if interest rates rose by 1–2 percentage points or work dried up temporarily.
- Check how the bank assesses your income. As a contractor, you may need tax returns, financial statements, bank statements and evidence of your work history. Requirements vary between lenders.
The New Zealand government's Consumer Protection mortgage guide is a useful starting point. Mortgages and home loansFind out how much of a mortgage you could get » Sorted
Let's narrow it down to your situation
The biggest factor is how your contract income behaves during the quiet periods.
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Captured 11 October 2026