Actual Cost Method Calculator Australia: Maximise Your Home Office Tax Deductions in FY 2025-26
Published 1 June 2026 · 8 min read
Working from home has become a permanent fixture for millions of Australians, and the ATO gives you two ways to claim tax deductions for your home office expenses: the fixed rate method (67 cents per hour) and the actual cost method. While the fixed rate method is simpler, the actual cost method can deliver significantly higher deductions if you have a dedicated home office with substantial running costs. This guide explains exactly how the actual cost method works, what you can claim, and how to choose the right approach for your situation in FY 2025-26.
Quick Answer
The actual cost method lets you claim the exact work-related portion of your home running costs — including electricity, gas, internet, phone, cleaning, and depreciation of home office furniture and equipment. Unlike the fixed rate method (67¢/hour), you need a dedicated home office space and must calculate the floor area percentage used for work. For an employee earning $100,000 with a 10% home office area working 40 hours per week, the actual cost method typically yields deductions between $2,500 and $5,500 per year, compared to $1,393 with the fixed rate method.
Fixed Rate Method vs Actual Cost Method: What's the Difference?
The ATO offers two distinct pathways for claiming home office deductions. The fixed rate method (67 cents per hour from 1 July 2023) covers a bundle of expenses at a single rate. It's designed for simplicity and doesn't require a dedicated home office space. The actual cost method, by contrast, requires you to calculate each expense individually based on your actual usage and home office floor area.
Choosing between them depends on your work setup. If you work from a dining table or shared living space, the fixed rate method is usually your only practical option. If you have a dedicated home office room, the actual cost method could deliver a much larger deduction. You cannot use both methods simultaneously — pick one and apply it consistently for the full financial year.
| Feature | Fixed Rate Method | Actual Cost Method |
|---|---|---|
| Rate | 67¢ per work hour | Actual expenses × work use % |
| Dedicated office needed | No | Yes (floor area calculation) |
| Electricity & gas | Included in 67¢ | Claim % of actual bills |
| Internet & phone | Claim separately | Claim % of actual bills |
| Depreciation | Claim separately | Claim % of decline in value |
| Cleaning | Not included | Claim % of cleaning costs |
| Record keeping | Timesheet + receipts | Timesheet + bills + floor plan |
How to Calculate Your Deduction Using the Actual Cost Method
The actual cost method involves a multi-step calculation. First, determine the floor area of your dedicated home office as a percentage of your total home floor area. Then, apply that percentage to your running costs. For electricity and gas, you can also use a more precise approach by metering specific usage or using the number of rooms instead of floor area.
| Step | Description | Example |
|---|---|---|
| 1 | Measure total home floor area (m²) | 120 m² |
| 2 | Measure home office floor area (m²) | 12 m² |
| 3 | Calculate work use percentage | 12 ÷ 120 = 10% |
| 4 | Determine hours worked from home | 1,040 hours (5 days × 40 wks) |
| 5 | Apply time % to shared expenses | Working hours ÷ 24 ÷ 365 |
For expenses that are shared with your household (like electricity, gas, and internet), you need to consider both the floor area percentage AND the time use percentage. The standard ATO approach multiplies the floor area percentage by the time percentage to get your claimable portion. For expenses that are exclusively work (like a dedicated work phone plan), you can claim 100%.
What Expenses Can You Claim Under the Actual Cost Method?
The actual cost method allows you to claim a wide range of home office expenses. Running costs include electricity, gas, water rates, and home internet. You can also claim depreciation on home office furniture and equipment (desks, chairs, monitors, laptops) using the ATO's effective life guidelines. Cleaning costs for your home office area are also deductible if you maintain a dedicated workspace.
| Expense Category | Claim Formula | Typical Annual Claim (10% office, 1,040 hrs) |
|---|---|---|
| Electricity & gas | Actual bill × office % × time % | $350 – $700 |
| Internet | Actual bill × work usage % | $200 – $500 |
| Phone (work calls) | Actual bill × work usage % | $150 – $400 |
| Office furniture depreciation | Cost ÷ effective life × office % | $200 – $600 |
| Computer & equipment depreciation | Cost ÷ effective life × work % | $300 – $900 |
| Cleaning (office area) | Cleaning cost × office % | $100 – $300 |
| Total estimated claim | $1,300 – $3,400 |
Items costing $300 or less (including GST) can be claimed immediately under the instant asset write-off threshold for small businesses — check with the ATO for the current limit. For assets costing more, you depreciate them over their effective life. A desk might have a 10-year life, while a laptop typically has 4 years. Use our income tax calculator to see how these deductions reduce your overall tax bill.
Actual Cost Method vs Fixed Rate: Which One Pays You More?
The answer depends entirely on your home office setup. The fixed rate method gives you a flat 67 cents per hour — for 1,040 hours (20 hours per week for 52 weeks), that's $696.80. If you work 2,080 hours (full-time from home), it's $1,393.60. The actual cost method can yield much more if you have a dedicated office and significant running costs.
| Work Arrangement | Fixed Rate (67¢) | Actual Cost (est.) | Better Method |
|---|---|---|---|
| 1 day/week from dining table | $327 | $100 – $200 | Fixed Rate ✓ |
| 2 days/week, small desk in living room | $654 | $300 – $500 | Fixed Rate ✓ |
| 3 days/week, dedicated office room | $981 | $1,200 – $2,500 | Actual Cost ✓ |
| Full-time, dedicated home office | $1,394 | $2,500 – $5,500 | Actual Cost ✓ |
The fixed rate method wins when you work from a shared space or only a few days per week. The actual cost method wins when you have a permanent, dedicated home office. The crossover point is typically around 2-3 days per week in a dedicated room. Use our income tax calculator to model how your deduction choice affects your refund.
Record Keeping for the Actual Cost Method
The ATO expects robust records for the actual cost method because it's harder to verify than the fixed rate approach. You need: a floor plan or diagram of your home showing the office room dimensions, a record of total home floor area, your utility bills (electricity, gas, internet), receipts for any home office furniture or equipment you purchase, and a timesheet or diary showing hours worked from home.
The ATO accepts a 4-week representative diary if your work pattern is consistent throughout the year. However, if your WFH hours vary significantly, maintain a running log. The myDeductions tool in the ATO app can help track expenses on your phone. Keep all records for at least 5 years after lodging your tax return. Without proper records, the ATO may disallow your claim entirely and impose penalties.
Superannuation and the Actual Cost Method
It's important to understand that claiming home office deductions doesn't affect your superannuation. Your employer's super guarantee contribution is based on your ordinary time earnings (OTE), not your taxable income after deductions. So claiming $3,000 in home office expenses reduces your taxable income but doesn't reduce the super your employer pays.
However, a lower taxable income could affect other calculations. For example, if you salary sacrifice into super, your concessional contributions are taxed at 15% inside the super fund. The personal tax saving from your home office deduction is at your marginal rate — which could be 30%, 37%, or 45% depending on your income. This makes home office deductions particularly valuable for higher-income earners. Check our superannuation calculator to see how deductions interact with your retirement savings strategy.
Frequently Asked Questions
Can I use the actual cost method without a dedicated home office?
No — the actual cost method requires a dedicated home office area that is used exclusively for work. If you work from a dining table or a shared living space, you can only use the fixed rate method (67 cents per hour) for your running costs.
What's the difference between the actual cost method and the old 52-cent rate?
The old 52-cent fixed rate method (pre-1 July 2022) is no longer available. From 1 July 2023, the ATO replaced it with the 67-cent fixed rate method and a revised actual cost method. The 67-cent rate bundles electricity, gas, and depreciation of home office furniture, while internet and phone are claimed separately.
Can I claim mortgage interest or rent under the actual cost method?
Generally no for employees. Occupancy expenses like mortgage interest, rent, council rates, and home insurance are only deductible if your home is your principal place of business — a very high bar that most WFH employees don't meet. However, sole traders and contractors running a business from home may qualify in some circumstances.
How do I calculate the floor area percentage?
Measure the floor area of your dedicated home office in square metres (length × width). Divide by the total floor area of your home. For example, a 12 m² office in a 120 m² home gives you 10%. You can use the ATO's floor area app or simply attach a hand-drawn floor plan to your records.
What if my actual cost method claim is lower than the fixed rate?
The ATO allows you to claim whichever method gives you the higher deduction — as long as you meet the requirements. If you have a dedicated office but your actual running costs are low (e.g., you have solar power and low energy usage), the fixed rate method might give you a better result. Calculate both and choose the higher one.