One of the first questions every aspiring homeowner asks is: how much deposit do I need? The answer isn't as straightforward as "20%," though that's the number often quoted. In reality, deposit requirements vary depending on your lender, the property, your income, and other factors. Understanding the true deposit requirements—and the costs associated with different deposit levels—helps you plan realistic savings targets and choose the path to homeownership that works best for your situation.
Many first-time buyers delay their purchase by years because they believe they need a 20% deposit. In fact, first home buyers can enter the market with deposits as low as 5–10%, though this comes with trade-offs. Knowing the full picture—minimum deposits, insurance costs, interest rate impacts, and long-term affordability—helps you make an informed decision about how much to save.
Understanding Loan-to-Value Ratio (LVR)
Lenders talk about loan-to-value ratio, or LVR, which is the percentage of the property's value you're borrowing. If you have a 10% deposit, your LVR is 90%. If you have a 20% deposit, your LVR is 80%. The lower your LVR (higher your deposit), the less risky the loan is from the lender's perspective, which translates to better terms for you.
Most lenders prefer LVRs of 80% or lower, which means at least a 20% deposit. However, first home buyer loans often allow LVRs up to 90% (10% deposit) or even 95% (5% deposit), particularly if you're buying with a licensed mortgage broker or through a special first home buyer program.
The 5–10% Deposit Option
With just 5–10% saved, you can now buy your first home in New Zealand. This is a game-changer for buyers who've been waiting years to accumulate 20%. However, there's a significant trade-off: mortgage insurance. When your LVR exceeds 80%, your lender requires you to purchase mortgage insurance, which protects them if you default on the loan.
Mortgage insurance typically costs 2–5% of your loan amount, added directly to your mortgage. On a $400,000 property with a 10% deposit ($40,000), your loan is $360,000. Mortgage insurance might cost around $10,800 (3%), bringing your total mortgage to $370,800. Spread over 25 years, this adds about $150–$200 per month to your repayment. For many buyers, this is a worthwhile trade-off for entering the market five years earlier.
The 15% Deposit Sweet Spot
Some first home buyers target 15% as their deposit—a middle ground that reduces but doesn't eliminate mortgage insurance. A 15% deposit means an 85% LVR, which typically triggers mortgage insurance but often at a lower rate than with a 10% deposit. This strategy allows you to avoid the highest insurance costs while still entering the market sooner than waiting for 20%.
The advantage of a 15% deposit is that it often qualifies you for better interest rates and lower insurance costs than a 10% deposit, while requiring less saving than 20%. If you can save $60,000 in two to three years, you're in a strong position to negotiate with lenders and have more loan options available.
The 20% Deposit Advantage
A 20% deposit remains the gold standard for homebuying. It avoids mortgage insurance entirely, qualifies you for the best interest rates lenders offer, and significantly reduces your monthly repayment. For a $400,000 property, a 20% deposit is $80,000—a substantial sum, but the benefits are real.
If you have the discipline and timeframe to save 20%, the long-term financial benefit is significant. Over a 25-year mortgage, avoiding mortgage insurance saves tens of thousands of dollars. However, if reaching 20% means delaying purchase by five years and missing out on property price growth and equity building, the economics might favour buying earlier with mortgage insurance.
Income and Serviceability Assessment
Your deposit is only one part of the lending equation. Lenders also assess whether you can afford the repayments. They typically require your total debt repayments (including the new mortgage) to be no more than 30–40% of your gross income. This means your income, not just your deposit, influences how much you can borrow.
If your income is modest, you might struggle to get approved for a large loan, regardless of your deposit size. Conversely, if you have a high income, you might be approved for a substantial loan even with a smaller deposit. Understanding your serviceability before you commit to a property price helps you avoid over-extending yourself.
Deposit Sources and Lender Requirements
Lenders want to see that your deposit comes from genuine savings, not from loans or gifts. While gifts from family are acceptable (with documentation), lenders will scrutinize your bank statements to confirm the deposit was built up over time. This is why demonstrating consistent savings history—regular transfers to a savings account—is valuable when applying for a mortgage.
If you're using KiwiSaver or government grants as part of your deposit, make sure your lender knows and has documented this. These are legitimate sources that lenders expect and encourage. When exploring home loan rates comparison options, disclose all your deposit sources so lenders can calculate your serviceability accurately.
Key Takeaway
You don't need 20% to buy your first home in New Zealand. With 5–10%, you can purchase, though you'll pay mortgage insurance and higher interest rates. A 15% deposit is a strategic middle ground, offering better terms than 10% while requiring less saving than 20%. Choose your deposit target based on your timeline, savings capacity, and risk tolerance. Most importantly, focus on what you can realistically save and what you can afford to repay, not on reaching an arbitrary percentage.