Offset Account Calculator Australia 2026
See how an offset account can slash your home loan interest, shorten loan term, and boost savings. Perfect for CBA, Westpac, ANZ, NAB & more. Free, instant results.
Mortgage offset & extra repayments simulator
Adjust loan details, offset balance, and extra repayments to see your potential interest savings in 2026.
Total interest saved
$0
Time saved (years/months)
0 yrs 0 mth
New payoff timeline
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Total interest (with offset)
$0
Daily compounded interest simulation. Offset reduces interest on (loan balance - offset). Extra repayments accelerate equity.
What is an offset account calculator & why Australian homeowners need it
An offset account calculator reveals the hidden power of linking a transaction account to your home loan. Every dollar in the offset balance "offsets" your loan principal before interest is calculated daily. For Australian borrowers, this can mean tens of thousands in interest savings and shaving years off your mortgage. In 2026, with rates stabilising, maximising offset benefits is a top financial strategy.
Unlike a standard repayment calculator, our mortgage offset account calculator factors in variable offset balances and extra repayments to model real-world scenarios used by major Australian lenders: CBA, Westpac, ANZ, NAB, Bankwest, and Macquarie. Whether you're looking at a 100% offset account or a partial offset, our tool delivers precise estimates.
How offset interest is calculated (daily formula)
Most Australian banks calculate interest daily on the outstanding loan balance minus your offset account balance. The formula: Daily interest = (Loan balance – Offset balance) × (Annual rate / 365). With our loan calculator with offset account, we simulate this daily effect month by month, providing accurate savings even when you add extra repayments.
| Offset balance | Loan amount ($500k) | Monthly interest saved (est.) | Total interest saved (30 yrs) |
|---|---|---|---|
| $0 | $500,000 | $0 | $0 reference |
| $10,000 | $500,000 | ~$51 | ~$18,400 |
| $25,000 | $500,000 | ~$128 | ~$46,000 |
| $50,000 | $500,000 | ~$256 | ~$92,000 |
| $100,000 | $500,000 | ~$512 | ~$184,000 |
Pro tip: The higher your offset balance, the more you reduce interest. Our offset account savings calculator shows you the exact dollar impact, especially if you maintain a consistent balance throughout the loan life.
5 exclusive strategies to supercharge your offset account (2026 insights)
Deposit your pay into offset — reduces average daily balance immediately.
Use interest-free days and keep cash in offset longer.
Part fixed, part variable with offset to maximise flexibility.
Keep 3–6 months expenses in offset — accessible & interest-saving.
Use our mortgage repayment calculator with offset account and extra payments to see accelerated results.
Offset vs redraw: which is better? (Australian context)
An offset account is often more flexible than a redraw facility because funds remain yours, no lender approval needed, and there are no tax implications for investment properties (check with accountant). Major banks like CBA, Westpac, and ING now offer 100% offset accounts for variable loans. Our offset account vs paying off mortgage calculator demonstrates that parking savings in offset is like earning a tax-free return equal to your mortgage rate. For 2026, with rates near 6%, that's equivalent to a ~9% pre-tax return for high-income earners.
Detailed comparison: offset balances + extra payments
| Scenario | Offset balance | Extra monthly payment | Interest saved (30yr loan $600k @6.15%) | Years cut |
|---|---|---|---|---|
| Standard loan | $0 | $0 | - | - |
| Offset only | $30,000 | $0 | $58,200 | 2.1 yrs |
| Offset + $200 extra | $30,000 | $200 | $88,400 | 4.3 yrs |
| Offset only | $75,000 | $0 | $132,000 | 4.7 yrs |
| Maximiser | $100,000 | $400 | $201,000+ | 7.2 yrs |
Data based on mortgage calculator with offset account and extra payments simulation. Actual results vary by lender and interest compounding method, but these illustrate powerful leverage.
Frequently Asked Questions (offset account Australia)
Lenders calculate daily interest on (loan principal – offset balance). Each night they apply the formula, then charge interest monthly. That’s why our offset account interest calculator uses daily compounding logic.
Combining both yields maximum benefit. Extra repayments reduce principal permanently, while offset gives liquidity. Our extra repayment calculator with offset account shows the synergy.
Yes. The calculator works for any Australian lender offering a variable rate offset account (including Commbank Offset, Westpac Choice, ANZ Offset). Adjust the rate and offset balance to match.
It means every dollar in the offset reduces your loan balance dollar-for-dollar before interest calculation. Most Australian home loans with offset are 100%.
No, interest saved is not considered income – it’s tax-free, making offset more attractive than a high-interest savings account (which is taxed).
You can simulate using cumulative interest formulas, but our online mortgage repayment calculator with offset account excel alternative gives instant accurate results.
Quick offset account checklist (2026 edition)
- ✓ Confirm 100% offset – ensure your product offers full offset, not partial.
- ✓ Check fees – some offset accounts have monthly package fees; weigh benefits.
- ✓ Daily balance matters – keep surplus cash in offset from salary deposits.
- ✓ Use extra repayment feature – combine to fast-track debt freedom.
- ✓ Review annually – rates change; use our offset account calculator CBA or Westpac annually to track progress.
Important disclaimer – please read
TotalCalcHub provides the offset account calculator for estimation only. Results are based on the inputs provided and assume consistent offset balance, unchanged interest rate, and standard monthly compounding. Actual savings depend on lender policies, fee structures, and daily balance fluctuations. Always consult a mortgage broker or financial advisor before making decisions. Updated for Australian market 2026.