The Hidden Mortgage Factors: How Childcare and Insurance Costs Can Affect Your Borrowing Power
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.
When you apply for a mortgage, it is easy to focus primarily on interest rates and deposit sizes. But behind the scenes, credit assessors are looking closely at something that often has a significant impact on your final approval: your everyday living expenses.
Under the Credit Contracts and Consumer Finance Act (CCCFA), New Zealand banks are required to ensure that any loan they offer is manageable and won't put you into hardship. To do this, they apply internal guidelines to figure out how much "uncommitted monthly income" you have left over at the end of the month.
The interesting part? Different banks treat specific lifestyle expenses very differently. If you have kids in daycare or hold a fair amount of personal insurance, applying with the right lender can make a noticeable difference to your borrowing power. Here is a look at how banks calculate these everyday factors, and how to navigate them effectively.
How Banks Assess Childcare (The Double-Dip Effect)
If you have a child in daycare, you already know it is a notable weekly expense. Banks recognize this too. However, lenders differ in how they factor this cost into your overall affordability.
Some banks calculate your childcare expenses as a completely separate, additional cost on top of their own baseline minimums, while others take a more flexible approach based on your actual spending. We call the standard approach the "Double-Dip" effect.
Imagine a single parent who manages their budget very carefully, spending $1,000 per month on basic living expenses (food, power, clothing), plus $2,000 per month on childcare. If a bank has an internal rule that a single borrower with one child typically spends a minimum of $1,500 per month on basic living expenses, a strict lender will use that $1,500 minimum and stack the $2,000 childcare cost directly on top of it. They have effectively double-counted a portion of your living costs, which reduces your borrowing capacity.
Insurance Premiums: Are They Included in Your Baseline?
Childcare isn't the only expense that banks look at closely. Monthly premiums for life, health, or income protection insurance are excellent for protecting your family, but they also factor into your monthly outgoings.
Just like the childcare example, lenders treat insurance premiums differently:
The Strict Add-On: Some lenders treat insurance as a separate ongoing commitment that must be deducted directly from your spare cash.
The Baseline Absorption: Other lenders view basic personal insurance as a normal part of running a household. They will often assume your premiums are already absorbed into their baseline minimum living expense calculations, leaving your borrowing capacity largely untouched.
The Three Bank Models: Strict, Hybrid, and Flexible
Because banks assess these two major expenses so differently, lenders generally fall into one of three categories when they review your application:
The Strict Model (Bank A): Uses high internal baseline minimums and adds both your childcare and your insurance premiums directly on top. This results in the most conservative borrowing limit.
The Hybrid Model (Bank C): Takes a middle-ground approach. They might be realistic about your childcare (using your actual basic living expenses), but they still treat your insurance as a strict, separate liability that must be added on top.
The Flexible Model (Bank B): Uses your actual basic living expenses alongside your childcare costs, and considers your insurance to be absorbed into your normal household running costs. This approach maximizes your borrowing power.
Note that these names aren’t generally used in the industry, it’s just what we’ve called them for this exercise.
Try It Yourself: The Expense Simulator
Use the interactive toggle below to see exactly how these three different bank policies process the exact same family profile, and how it impacts the final borrowing capacity!
How Much Do Your Expenses Impact Your Loan?
See how the exact same single parent with one child—and comprehensive insurance—is assessed differently by three different lenders.
*Estimated borrowing capacity assumes a $120,000 gross salary, a ~7% servicing test rate, and standard uncommitted income buffers. For illustrative and educational purposes only.
How Home Loan Factory Can Help
If you have a growing family or comprehensive insurance policies, going directly to just one bank can limit your options. If that specific bank uses a more conservative assessment method, you may be offered less than you might qualify for elsewhere.
At Home Loan Factory, we have access to the exact expense calculators and servicing policies of all the major lenders in New Zealand. Before we submit your application, we run your numbers through the unique calculators of multiple different banks. We strategically match your specific lifestyle profile to the lender who will view your childcare and insurance expenses the most favorably, ensuring you get a fair assessment and maximize your potential borrowing power.
Are childcare or insurance costs featuring heavily in your budget? Get in touch with the team at Home Loan Factory today for a clear, easygoing chat about your options.
