Two payslips, one application. Most couples walk into their first loan assuming a second income roughly doubles what the bank will lend, and the assessment does not work that way. Buying your first home as a couple in Australia is a different application, not just a bigger one: the lender reads your expenses, debts and credit files as a single unit. The structure you choose now will outlast the rate you fix later.
The timing favours you more than the headlines suggest. The RBA lifted the cash rate three times in 2026, held it at 4.35% in June, and meets again on Tuesday 11 August 2026. Rising rates thin the field: fewer bidders on auction day, more room to negotiate, vendors who return your calls. Cotality's June 2026 data shows a two-speed market, Brisbane up 17.4% over the year while Sydney and Melbourne drift backwards, so what "good timing" means depends on the city the two of you are buying in.
Does a second income double your borrowing power?
No. It adds more than one income alone, but less than double, and three things cause the gap.
First, living costs. Lenders benchmark your spending against the Household Expenditure Measure, and a couple's benchmark sits well below two singles' combined, which works in your favour. (Our guide to how banks calculate borrowing capacity unpacks the HEM in detail.) Second, debts double up: both HECS balances, both car loans, and both credit card limits count, whether or not a card has ever carried a balance. Third, the APRA serviceability buffer tests your combined loan at your actual rate plus 3 percentage points, so a bigger joint loan means a bigger stress-tested repayment.
A fourth ceiling arrived this year. Since 1 February 2026, APRA's debt-to-income caps limit each bank to writing no more than 20% of new lending at six times income or above. A couple on $200,000 combined chasing $1.25 million sits above that line, which means fewer lenders will want the loan and the ones that do will assess it harder. Keep the ask under six times combined income and most of the panel opens back up.
HECS deserves its own line for dual-graduate couples. The 20% balance cut has been applied, repayments now start at $69,528 for 2026-27, and since 30 September 2025 lenders can exclude a HELP debt that is close to being paid off. If one balance is nearly gone, clearing it before you apply removes that repayment from the assessment entirely.
What does the bank see when two of you apply?
Everything, twice. A joint application bundles two credit files, two sets of bank statements and two employment histories, and the assessor treats the weakest line in either file as the couple's line.
We've watched a tidy joint application slow down over one partner's forgotten buy-now-pay-later account: assessors read both sets of statements side by side, and a $290-a-month repayment counts against the household even if the other partner has never opened the app. Full disclosure to each other, before the bank makes it awkward, is the cheapest fix in home lending.
The rest of the fix is boring and effective. Three months out, both of you close unused cards, reduce limits you don't need, and cancel forgotten subscriptions. Talk about the family plan too, because the lender will ask: a dependant, or a planned parental-leave year, changes the numbers in ways worth knowing before the interview rather than during it. How dependants affect your borrowing power covers exactly what changes.
Whose name goes on what: loan, title and the split
The loan and the title are separate decisions. Most lenders want everyone on the title to be on the loan, so for most couples both names go on both, and the real choice is how you hold the title.
| Joint tenants | Tenants in common | |
|---|---|---|
| Ownership split | Equal and undivided | Any split you choose (70/30, 60/40) |
| If one of you dies | Share passes automatically to the other | Share passes under your will |
| Typical fit | Shared deposit, shared everything | Unequal deposits, blended families |
| Watch for | Doesn't recognise a bigger contribution | Put the co-ownership agreement in writing |
Joint tenancy suits couples who treat the deposit and the debt as fully shared. Tenants in common lets a 70/30 deposit stay a 70/30 asset, which matters where parents helped one side or the savings histories differ sharply. Your conveyancer or solicitor sets this at settlement, and it is legal advice territory rather than broker territory: ask early, because changing it later costs money.
Government guarantees assess a couple as a unit too: if one of you has owned property before, confirm eligibility before you build the plan around a 5% deposit.
Do you need a 20% deposit to buy your first home as a couple?
On a $900,000 townhouse, 20% between you is $180,000. Saving it takes years. Two floors now sit below it.
The first is the Australian Government 5% Deposit Scheme (formerly the First Home Guarantee). The old scheme excluded most dual-income households with its $200,000 joint income cap; since 1 October 2025 the caps are gone entirely, no income limits and no place limits, so a couple can buy with a 5% deposit and no LMI, subject to property caps that vary by state (NSW's sits at $1.5 million).
The second is the floor Wity renegotiated. The 20% convention the industry ran on for decades no longer applies through Wity: under specialist lending policies available through Wity, any borrower can buy at 85% LVR with no LMI, which is a 15% deposit, at standard rates. On that $900,000 townhouse, the typical LMI bill at 85% runs $12,000 to $16,000. Waived, and you skip 30 years of interest on it too. (More in you don't need a 20% deposit.)
The couples' trap isn't borrowing too much. It's saving too long: each year spent chasing a 20% target in a rising city is a year of growth you rent instead of own.
And if one of you wears scrubs to work, say so early. Under the same specialist policies, nurses, midwives and allied health professionals can qualify with a 10% deposit and no LMI, and doctors and dentists with 5%, HECS excluded from the assessment. Mixed-profession households should check eligibility before assuming the 15% floor is theirs.
Emma and Jack: one deposit, two timelines
Emma is an ICU nurse at the Mater, on $92,000 plus penalties. Jack project-manages office fit-outs on $105,000. They rent in Woolloongabba, hold $135,000 in savings, and want a $900,000 townhouse in nearby Greenslopes.
Path A: wait for 20%. The target is $180,000, so at $2,500 a month they close the $45,000 gap in 18 months. But Brisbane grew 17.4% in the year to June 2026 on Cotality's numbers, and if Greenslopes runs at even half that pace, the same townhouse costs about $1,020,000 by the time they arrive, and the 20% target has moved to $204,000. Eighteen months of disciplined saving buys them $21,000 of net progress, about $50,000 in rent, and a bigger loan at the end of it.
Path B: buy now at 15%. Their $135,000 covers the deposit under the universal 85% policy, and the LMI most lenders would charge on the $765,000 loan, typically $12,000 to $16,000, is waived. On the same growth assumption they hold roughly $120,000 of appreciation at the 18-month mark instead of chasing it. Emma's AHPRA registration is worth raising too: the nurses and midwives tier starts at a 10% deposit, freeing $45,000 for stamp duty and buffers, and your Wity broker confirms eligibility for a joint application.
The gap: the disciplined path can be the expensive one when the market moves faster than the savings account.
Based on typical scenarios and illustrative growth assumptions. Individual outcomes vary.
What should you do before your first inspection?
Three things, in order.
Get the real number. The Wity Borrowing Power Assessment models your capacity as a couple across 45+ lenders rather than one bank's calculator, including how each lender treats penalty rates, overtime and contract bonuses. The spread between the most and least generous lender on the same couple is often six figures.
Get pre-approved before you inspect, not after you fall for something. What is pre-approval and why it matters explains what it locks in and what it doesn't.
Then run the full sequence. Our first home buyer guide for 2026 covers the path from deposit to keys, and Wity takes the two of you through Match, Connect, Plan and Settle with one broker across the lot.
Want the real number for the two of you? Start the Wity questionnaire → Free, no credit check, two minutes, and you'll both see the same answer.