100% Offset vs Partial Offset — What’s the Difference? (2026)
Not all offset accounts are created equal. When comparing home loans, check whether the offset account is a 100% offset or a partial offset — the difference is significant, and partial offset products are often marketed without making the distinction obvious.
What Is a 100% Offset Account?
A 100% offset account reduces the loan balance on which interest is calculated by the full amount held in the offset account — dollar for dollar.
Example:
- Loan balance: $500,000
- Offset account balance: $40,000
- Interest is charged on: $500,000 − $40,000 = $460,000
Every dollar in the account saves interest at the full loan rate. This is the standard offset account available from major Australian lenders.
What Is a Partial Offset Account?
A partial offset account only offsets a portion of the balance held — for example, 40% or 50% of the account balance.
Example at 40% partial offset:
- Loan balance: $500,000
- Offset account balance: $40,000
- Effective offset: $40,000 × 40% = $16,000
- Interest is charged on: $500,000 − $16,000 = $484,000
Compared to 100% offset, partial offset saves substantially less interest on the same funds.
Side-by-Side Comparison
$500,000 loan at 6%, $40,000 in offset:
| Offset type | Interest base | Monthly interest | Annual interest saving vs no offset |
|---|---|---|---|
| No offset | $500,000 | $2,500 | — |
| 40% partial offset | $484,000 | $2,420 | $960/year |
| 100% offset | $460,000 | $2,300 | $2,400/year |
The 100% offset account saves 2.5× more than a 40% partial offset on the same balance.
Why Do Partial Offset Accounts Exist?
Partial offset accounts allow lenders to offer an “offset” feature while retaining more interest revenue than a full 100% offset. They may be packaged as a lower-rate loan with a partial offset, or as a feature on basic/no-fee loans.
From a borrower’s perspective, partial offset is almost never preferable to a true 100% offset account — unless it comes with a substantially lower rate on the loan itself.
How to Identify Whether an Offset Is 100%
When researching home loans:
- Read the Key Facts Sheet — required by ASIC for home loans; offset account details should be included
- Check the Product Disclosure Statement or loan fact sheet — look for language like “100% offset” vs “offset at X%”
- Ask the lender or broker directly: “Is this a 100% offset account?”
- Look for the words “100% offset” or “full offset” — if it simply says “offset account,” ask for clarification
Other Offset Account Variations to Watch For
Beyond 100% vs partial, also check:
| Variation | What to look for |
|---|---|
| Account type | Is it a true transaction/savings account, or a specific offset account type? |
| Linked accounts | Can you link multiple accounts (see below)? |
| Interest rate on offset balance | Offset accounts should not pay interest themselves — the saving is on the loan |
| Caps on offset | Is there a maximum balance that counts toward offset? Some older products cap at $100k or $200k |
Multiple Offset Accounts
Many lenders now allow multiple 100% offset accounts linked to the same loan. This is useful for:
- Budgeting (separate accounts for bills, emergency fund, holiday, investments)
- PAYG couples splitting income across two offset accounts
- All balances still offset the single loan at 100%
→ See How Many Offset Accounts Can I Have?
Frequently Asked Questions
Are partial offset accounts common in Australia?
They are less common than they once were. The market has largely shifted to 100% offset as the standard feature on package loans. However, some basic or no-fee loans may still offer partial offset. Always confirm before selecting a loan.
Can I switch my partial offset to 100% offset?
Typically not within the same loan — partial offset is a loan product feature, not a setting. If your current loan has partial offset and you want 100% offset, you would likely need to refinance to a different product. A mortgage broker can assess whether refinancing is worthwhile.
Does a 100% offset account cost more than partial offset?
100% offset accounts are typically found on package loans with an annual fee ($350–$400/year). Some no-fee loans offer partial offset as a compromise. Whether the annual fee is worth it depends on your expected offset balance. At 6%, a $395/year fee is recovered by approximately $6,600 in offset.
Related Guides
- What Is a Mortgage Offset Account?
- How Offset Accounts Save You Money
- How Many Offset Accounts Can I Have?
- Offset Account vs Extra Repayments
- Mortgage Repayment Hub
This article provides general information about offset account types in Australia. Product features vary by lender — always verify directly with the lender or in the Key Facts Sheet. For advice tailored to your situation, speak with a licensed mortgage broker. Find one through MoneySmart.