It's a question many first-home buyers ask: "Can I take out a personal loan to boost my deposit?" The logic seems sound - a larger deposit means better loan-to-value ratio (LVR), potentially lower interest rates, and access to more lenders. But before you apply for that personal loan, there's something important you need to understand about how banks view deposits.
Why Deposit Size Matters
The size of your deposit significantly affects your mortgage terms. With a 20%+ deposit, you get access to the best rates, no low equity premium, and all lenders are available. With 10-20% deposit, a low equity margin or premium is added, typically 0.25-1.0% on top of standard rates. With just 5-10% deposit, you face limited lender options, higher costs, and the First Home Loan may be required.
On a $700,000 property:
| Deposit | LVR | Approximate First-Year Interest Difference |
|---|---|---|
| $140,000 (20%) | 80% | Baseline |
| $105,000 (15%) | 85% | +$3,000-4,000 |
| $70,000 (10%) | 90% | +$5,000-7,000 |
The temptation to borrow a quick $30,000-50,000 to reach the next LVR tier is understandable. But banks see it very differently.
Why Banks Don't Accept Borrowed Deposits
Banks require deposits to demonstrate two things. First, financial discipline: saving a deposit shows you can manage money, live within your means, and prioritise long-term goals. Second, equity buffer: your deposit represents your stake in the property, so if values fall, you absorb the loss before the bank does.
A borrowed deposit achieves neither. If you borrow your deposit, you haven't demonstrated saving ability, your "equity" is actually debt, you're already stretched before the mortgage begins, and total debt servicing may exceed safe limits.
Banks specifically check for borrowed deposits during the application process. They review 3-6 months of bank statements and will ask about large deposits or transfers.
What Counts as "Genuine Savings"?
Banks accept deposits from several sources. Genuine savings include money you've saved over time (typically held for 3+ months), regular contributions to a savings account, and accumulation of KiwiSaver funds with documentation of your contributions.
Family gifts are accepted if properly documented. The gift must be non-repayable, meaning the giver signs a declaration confirming the money never needs to be returned. Some banks require the gift to be held for 3 months before use.
KiwiSaver withdrawal is another option, using your balance after 3+ years of membership. You must leave $1,000 in the account, and this option cannot be used for investment property.
Other acceptable sources include sale of assets like shares or vehicles with documentation, inheritance with supporting documentation, and redundancy or bonus payments with payslips.
The Problem with Personal Loans
Personal loans create several issues. Every dollar you owe reduces what you can borrow for a mortgage. Banks calculate your debt-to-income (DTI) ratio including all debts. A $30,000 personal loan with $600/month repayments could reduce your mortgage borrowing by $100,000+.
Personal loan rates, typically 12-20%, are far higher than mortgage rates. Borrowing $30,000 at 15% for five years costs over $12,000 in interest - money that could have gone toward your mortgage.
A recent personal loan application shows on your credit file. When the mortgage lender sees it, they'll ask why, and "to boost my deposit" is not an answer that helps your application.
What About Buy Now Pay Later?
BNPL services like Afterpay and Laybuy create similar problems. While each individual purchase may seem small, banks count your total BNPL limits when assessing your application. Multiple BNPL accounts signal to lenders that you may struggle with cash flow management.
Close or reduce BNPL accounts 3-6 months before applying for a mortgage.
Legitimate Alternatives to Increase Your Deposit
Keep Saving
It might not be what you want to hear, but sometimes the best answer is more time. Even 3-6 months of aggressive saving can make a significant difference. Consider reducing expenses temporarily, taking on extra work or side income, and selling unused items.
Family Gift
If family members want to help, a documented gift is the proper way to do it. You'll need a signed gift declaration confirming it's non-repayable, proof of the donor's source of funds to meet anti-money laundering requirements, and some banks require the gift to be held for 3 months.
KiwiSaver Maximisation
Are you contributing enough to get the full government contribution ($260.72/year)? Are you in the right fund type for your timeline? Have you been a member for 3+ years?
New Build Properties
New builds often allow lower deposits (10-15%) without low equity premiums. This is because new construction is lower risk for banks. If you're struggling to reach 20%, consider new-build options.
First Home Loan
Through Kāinga Ora, qualifying buyers can purchase with as little as 5% deposit. Income caps apply ($95,000 single, $150,000 combined), and properties must be under regional price caps.
The Bank Statement Review
Banks don't just glance at your statements. They review 3-6 months of transactions looking for gambling transactions, excessive lifestyle spending, large unexplained deposits, Buy Now Pay Later activity, and loan applications or drawdowns. A personal loan taken out shortly before your mortgage application will be visible and will require explanation.
The Honest Path Forward
While it might seem like borrowing for a deposit is a shortcut to homeownership, it typically creates more problems than it solves. Banks specifically look for borrowed deposits and will reject applications where the deposit isn't genuine.
The alternatives - saving longer, accepting family gifts properly, maximising KiwiSaver, or exploring lower-deposit options - are more work but will result in a stronger mortgage application and better long-term financial position.
If you're unsure about your deposit situation, talk to a mortgage adviser. They can assess your specific circumstances and advise on the best path forward.
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