Offset Account Benefits: How to Save Thousands on Your Mortgage
IntuitiveCalc Team
Financial Content Specialist
Understanding offset accounts could save you tens of thousands of dollars and shave years off your mortgage. Here's everything you need to know.
What is a Mortgage Offset Account?
An offset account is a transaction account linked to your home loan. The balance in your offset account is "offset" against your mortgage principal, so you only pay interest on the difference. It's one of the most powerful tools available to Australian homeowners for reducing interest and paying off their mortgage faster.
How Offset Works: Simple Example
Mortgage: $500,000 at 6.5% p.a.
Offset Balance: $50,000
Interest charged on: $450,000 ($500,000 - $50,000)
Annual savings: $3,250 (10% × $50,000 × 6.5%)
Types of Offset Accounts
100% Offset Accounts
With a 100% offset account, every dollar in your account reduces your mortgage balance dollar-for-dollar. This is the most common type offered by major Australian banks and provides maximum benefit.
Partial Offset Accounts
Partial offset accounts only offset a percentage of your balance (e.g., 40% or 50%). While better than no offset, the savings are significantly reduced. These are less common now but still offered with some basic loan packages.
| Offset Type | How It Works | $50k Balance Benefit | Availability |
|---|---|---|---|
| 100% Offset | Full balance offsets mortgage | $3,250/year saved* | Most major banks |
| 50% Offset | Half of balance offsets | $1,625/year saved* | Basic packages |
| No Offset | No benefit | $0 saved | Basic variable loans |
*Based on 6.5% interest rate on $500,000 loan
Offset Account vs. Redraw Facility
Many Australians confuse offset accounts with redraw facilities. While both can reduce interest, they work differently and have distinct advantages.
Offset Account
- Separate transaction account
- Funds remain yours – not extra repayments
- Instant access, no approval needed
- Better for investment properties (tax reasons)
- Usually has monthly fee ($10-$15/month)
Redraw Facility
- Extra repayments stored in loan
- Funds become "extra repayments"
- May have redraw limits or fees
- Could affect tax deductibility
- Usually free with variable loans
Tax Warning for Investment Property Owners
If you have an investment property loan, using redraw then spending the money on personal items can affect tax deductibility. An offset account keeps the loan and savings completely separate, preserving your tax deduction. Always consult a tax professional.
How Much Can You Save with an Offset Account?
The savings from an offset account can be substantial over the life of a loan. Here's how different offset balances impact a typical Australian mortgage:
| Offset Balance | Annual Interest Saved | 30-Year Total Saved | Time Saved Off Loan |
|---|---|---|---|
| $10,000 | $650 | $19,500 | ~6 months |
| $25,000 | $1,625 | $48,750 | ~1 year 3 months |
| $50,000 | $3,250 | $97,500 | ~2 years 6 months |
| $75,000 | $4,875 | $146,250 | ~3 years 9 months |
| $100,000 | $6,500 | $195,000 | ~5 years |
Based on $500,000 loan at 6.5% p.a. over 30 years. Assumes constant offset balance.
Offset Account Strategies
1. Salary Crediting Strategy
Have your entire salary paid into your offset account instead of a regular bank account. Even though you'll spend most of it during the month, the daily balance contributes to interest savings.
Example: Salary Crediting Benefits
Monthly salary: $7,000 (credited on the 1st)
Average daily balance throughout month: $3,500
Annual interest saved: $3,500 × 6.5% = $228/year
This is free money – you're spending the same but saving on interest!
2. Bills Hub Strategy
Keep all your bill money in the offset account and pay bills via direct debit on their due dates (not early). This maximizes the time money sits in offset, earning you 6-7% in saved interest rather than sitting in a 0% transaction account.
3. Emergency Fund in Offset
Instead of keeping your emergency fund in a savings account earning 4-5%, store it in your offset account. You'll effectively earn your mortgage rate (6-7%) tax-free, while maintaining instant access.
Why Offset Beats Savings Accounts
Savings account at 5%: After tax (37% bracket), you keep 3.15%
Offset account at 6.5%: You keep 6.5% (no tax on "saved" interest)
The offset effective return is often double what you'd get from a savings account after tax!
4. Multiple Offset Accounts
Some lenders allow multiple offset accounts linked to one loan. This is useful for separating savings goals while still reducing your mortgage interest.
- Offset 1: Emergency fund ($15,000)
- Offset 2: Bills/everyday spending
- Offset 3: Holiday savings ($5,000)
- Offset 4: Car replacement fund ($10,000)
When an Offset Account Makes Sense
Offset accounts typically come with slightly higher interest rates or monthly fees. You need to maintain a minimum balance for the offset to be worthwhile.
Break-Even Calculation
If your offset account has a $10/month fee and your loan rate is 6.5%, you need at least $1,846 in the offset to break even:
Break-even balance = (Annual fee ÷ Interest rate)
= ($120 ÷ 0.065)
= $1,846
| Monthly Fee | Break-Even at 6% | Break-Even at 6.5% | Break-Even at 7% |
|---|---|---|---|
| $0 | $0 | $0 | $0 |
| $10 | $2,000 | $1,846 | $1,714 |
| $15 | $3,000 | $2,769 | $2,571 |
| $20 | $4,000 | $3,692 | $3,429 |
Offset Account Is Worth It If:
- You can maintain a balance above the break-even point
- You have an emergency fund you want accessible
- You're disciplined about not spending offset funds
- You have an investment property (tax deductibility preservation)
- You're in a higher tax bracket (offset beats savings accounts more)
Offset May Not Be Worth It If:
- You can't maintain a minimum balance
- The rate difference vs. basic loan is too high (>0.3%)
- You'd be better off making extra repayments instead
- You have high-interest debt to pay off first
Choosing the Right Offset Account
Key Features to Compare
100% Offset
Ensure it's a full 100% offset, not partial. Partial offsets are rarely worth it.
Transaction Features
Debit card, BPAY, PayID, direct debits – you want full functionality as your main account.
Fees
Compare monthly fees vs. potential savings. Some premium packages waive fees above certain balances.
Multiple Offsets
Some banks allow multiple offset accounts linked to one loan for better organization.
Split Loan Capability
If you want part fixed and part variable, check if offset applies to both portions.
Offset Accounts by Major Australian Banks
| Bank | Offset Type | Monthly Fee | Multiple Offsets |
|---|---|---|---|
| CBA | 100% | $10 (Wealth Package) | Yes (up to 10) |
| Westpac | 100% | $10 (Premier Package) | Yes (unlimited) |
| NAB | 100% | $10 (Choice Package) | Yes |
| ANZ | 100% | $10 (Breakfree) | Yes |
| Macquarie | 100% | $0 | Yes (up to 10) |
| ING | 100% | $0 | No (1 only) |
Fees and features as of January 2025. Always confirm current offerings with lenders.
Common Offset Account Mistakes
1. Treating It Like a Spending Account
The temptation to spend "saved" money is real. Remember: money in offset isn't bonus spending money – it's working to pay off your home faster.
2. Ignoring the Fee vs. Benefit Calculation
If your average balance is $2,000 and fees are $15/month, you're paying $180/year to save $130. Not worth it.
3. Not Switching Salary Deposits
Many people get an offset account but keep their salary going to a separate bank account. Switch it to maximize daily offset benefits.
4. Keeping Too Much in Savings Instead
After-tax savings account returns are usually lower than offset benefits. Move accessible savings to your offset.
Offset Accounts and Investment Properties
For investment property owners, offset accounts are particularly valuable for maintaining tax deductibility. The ATO allows you to claim interest on investment loans as a tax deduction, but only if the borrowed funds are used for investment purposes.
The Problem with Redraw on Investment Loans
If you make extra repayments into an investment loan and then redraw those funds for personal use (like a holiday), the redrawn portion may lose its tax deductibility. This is known as "contaminating" your investment loan.
Why Offset Is Safer
With an offset account, your savings are never mixed with loan repayments. The loan balance stays the same, so your full interest remains deductible. When you spend offset funds, you're just spending your own savings – not contaminating the loan.
Investment Property Strategy
Best practice: Use an offset account for investment loans, never redraw. Keep the loan "clean" for maximum tax deductibility. Consult a tax accountant for personalized advice.
Frequently Asked Questions
Can I have an offset on a fixed-rate loan?
Most banks don't offer full offset accounts with fixed-rate loans. Some offer partial offsets or a small 100% offset on a portion of a split loan. Variable rate loans with offset provide the best flexibility.
Does money in offset count as savings for loan applications?
Yes, when applying for another loan, banks consider offset account balances as savings/assets. It demonstrates good savings habits and financial responsibility.
Should I put all my money in offset or diversify?
For liquidity and safety, offset is excellent. However, if you're comfortable with market risk and have a long time horizon, investing in diversified ETFs may provide higher returns (historically 7-10% for shares vs. 6-7% offset). Balance is key.
What happens to my offset if I refinance?
You'll need to set up a new offset account with your new lender. The funds transfer easily, but ensure your new loan has an offset feature before refinancing.
Use Our Calculators
Understand how offset accounts affect your mortgage with our free calculators: