Keystart vs. Big 4: A technical comparison of deposit requirements in WA

The default advice for years in Perth has been simple: “If you have a 20% deposit, go to a bank. If you have 2%, go to Keystart.”

In 2026, good income + deposit no longer guarantees approval in Perth.

Structural changes to Federal low-deposit schemes and shifts in APRA-regulated serviceability buffers have blurred the lines. The “Big 4” (CBA, Westpac, NAB, ANZ) are no longer just for the cash-rich, and Keystart is no longer the only option for the deposit-poor.

For Perth buyers, the choice now comes down to technical eligibility, specifically how lenders treat your “genuine savings” and how they stress-test your income.

Here is the deep-dive technical comparison for the WA market that your bank manager won’t explain to you.

1. The “Genuine Savings” Hurdle

Most blogs gloss over this, but it is the #1 reason Perth buyers fail at the final hurdle with major banks, even if they have the cash.

The Big 4 Requirement

Major banks typically distinguish between “Market Savings” and “Genuine Savings.”

The Rule: If your Loan-to-Value Ratio (LVR) is above 90% (i.e., you have less than a 10% deposit), banks strictly require you to demonstrate 5% of the purchase price has been held in your account or accumulated over 3 months.
The Trap: If your parents gift you $30,000 for a deposit, or you sell a car for cash, the bank may not count this as “genuine savings.” They will see the funds, but they will deny the loan because you didn’t “sweat” for it over 90 days.

The Keystart Advantage

Keystart operates differently.

The Technical Difference: Keystart generally does not have a strict “genuine savings” policy in the same way APRA-regulated banks do.
The Outcome: You can use the First Home Owner Grant (FHOG) as your entire deposit for a new build. If you are buying established, a cash gift from parents deposited yesterday is often acceptable for the 2% required deposit.

Pro Tip: Some major banks have recently introduced “Rental History as Genuine Savings” policies. If you have rented for 12 months with a perfect ledger, we can sometimes bypass the 3-month savings rule. This is a critical internal check we perform during your Free Consultation.

2. Serviceability Buffers: The Hidden “Borrowing Power” Killer

Interest rates capture the headlines, but assessment rates determine if you get approved.

Big 4 (APRA Regulated)

Banks must assess your ability to repay the loan not at the actual interest rate (e.g., 6.2%), but at a “buffer” rate (usually +3%).

The Math: If your rate is 6.2%, the bank tests your finances at 9.2%.
The Impact: This significantly reduces your borrowing power. A couple earning $150k might be capped at borrowing $650k, pushing many Perth suburbs out of reach.

Keystart (State Policy)

Keystart is not an APRA-regulated Authorized Deposit-taking Institution (ADI).

The Technical Difference: Historically, Keystart has used a lower serviceability buffer or a modified assessment rate.
The Outcome: This often allows Keystart to lend more money to the same applicant compared to a major bank. If you are falling $40k short of buying that villa in Balcatta or Nollamara, Keystart’s calculation method might be the bridge that gets you over the line.

3. The LMI vs. Interest Rate Trade-off

This is where the financial modelling gets interesting.

Feature	Keystart	Big 4 (Standard)	Big 4 (First Home Guarantee)
Deposit Min	2%	5-10%	5%
LMI Cost	$0 (Waived)	~$15k – $30k (Add to loan)	$0 (Govt Guaranteed)
Interest Rate	Higher (Floating ~7%+)	Lower (Floating ~6%)	Lower (Floating ~6%)
Income Caps	Strict Limits (Singles $148k*)	No Limits	Strict Limits (Singles ~$125k*)

Limits subject to change; accurate as of late 2025/early 2026 data.

The “Interest Rate Premium”

Keystart charges no Lenders Mortgage Insurance (LMI), saving you roughly $15,000 upfront on a $500,000 home. However, their interest rate is higher.

The Reality: You are paying a premium on the rate instead of an insurance policy upfront.
The Strategy: Keystart is a transitional product. The goal should be to enter the market, build equity as Perth prices rise, and then refinance to a Big 4 bank once your Loan-to-Value ratio drops below 80%.

The Federal Scheme Disruption

The Federal Government’s First Home Guarantee (FHBG) allows you to buy with a 5% deposit via a Big 4 bank without paying LMI.

The Winner: If you have 5% saved and fit the income caps, the Big 4 option via the FHBG is mathematically superior to Keystart because you get the low deposit benefit plus the lower bank interest rate.
The Catch: Spots in this scheme are limited and income caps apply. If you earn over the threshold (e.g., a FIFO worker on $160k), you are ineligible for the Federal scheme and Keystart might still be your only low-deposit route.

4. 2026 Property Price Caps: The Perth Reality

As of late 2025, Keystart raised their property price limits to $800,000 across WA. This was a necessary adjustment to keep up with Perth’s median price growth.

However, Federal schemes (used by Big 4) also have price caps.

If you are looking at a property in the $700k–$800k range, you are in a “danger zone” where slight price increases could disqualify you from Federal schemes, leaving Keystart as the safety net.

Why Buyers Fail

The most common failure point we see in 2026 isn’t a lack of income—it’s valuation shortfalls.

If you buy a house for $650k, but the bank values it at $630k, your deposit percentage changes instantly.

Bank Reaction: They may demand you cover the $20k gap plus maintain your LVR, which usually kills the deal.
Keystart Reaction: Often more pragmatic, but they still require the LVR to stack up.

For a full list of failure points before you sign an offer, read our 2026 First Home Owner Pre-Approval Checklist.

The Verdict: Which one is for you?

Choose Keystart if:

You have less than 5% deposit (e.g., only 2%).
You have “non-genuine” savings (gifts, cash sales).
You need slightly higher borrowing capacity than banks allow.
You are a high-income earner (FIFO) but asset-poor (divorce or recent migration) and you fit under the newly adjusted Keystart income caps.

Choose Big 4 (plus Schemes) if:

You have a clear 5% genuine savings history.
You qualify for the First Home Guarantee (Income <$125k single / <$200k couple).
You want the lowest possible monthly repayment immediately.

Don’t Guess—Calculate.

The policy differences between “Genuine Savings” and “Serviceability Buffers” can mean the difference between a decline and an approval.

We can run a dual-scenario assessment for you: one showing your capacity with Keystart, and one with a major lender.

Book your Free Consultation here to see exactly where you stand in the 2026 Perth market.

Or, explore our dedicated services for First Home Owners to learn more about how we structure these applications.