If you work from home, your tax authority lets you turn part of your housing costs into a business deduction. The problem is that almost every country offers you two ways to calculate it: a simplified flat rate and an actual cost method. The simplified method is quick, the actual method usually pays more, and the gap between them can be thousands. This guide compares simplified vs actual in the US, UK, Australia and Canada, with worked examples, so you can pick the method that saves you more.
Rates last reviewed: October 2026.
What is the difference between simplified and actual method?
The simplified method lets you claim a fixed flat rate or per-hour/per-square-foot amount set by the tax authority, with minimal record keeping. The actual method lets you claim the business share of your real home running costs, based on measurements and receipts, which usually produces a larger deduction but takes more work.
Put simply, the simplified method trades money for time. You accept a capped, one-size-fits-all amount and skip the paperwork. The actual method asks you to measure your office, collect your bills, and apportion real costs to the business share, and in return it usually gives you a bigger number on your tax return.
Both methods follow the same principle: only the business portion of your home costs is deductible. The methods differ in how that portion is calculated. Simplified methods use a rate the tax authority sets in advance. Actual methods use your own receipts, multiplied by the share of your home used for business.
Rule of thumb: if you rent in an expensive city or own a home with serious running costs, the actual method almost always wins. If your office is small and your bills are modest, the simplified method may be close enough to justify skipping the paperwork.
Simplified vs actual method in the US: how does the IRS compare them?
The IRS lets you choose each year between the simplified method, which is $5 per square foot of office space up to 300 square feet (maximum $1,500 a year), and the regular method, where you apportion actual home expenses on Form 8829 with no cap. Renters and homeowners with big bills usually gain more from the regular method.
The simplified method works exactly as the name suggests. Measure the square footage of your home office (up to 300 square feet), multiply by $5, and that is your deduction. A 120 square foot office gives you $600. A 400 square foot office is capped at 300, giving you $1,500. There is no Form 8829, no tracking of utilities or rent, and no depreciation on the home. You can still claim your full mortgage interest and property taxes as itemised deductions on Schedule A. The rules are set out in IRS Topic 509 and Publication 587.
The regular method has no cap but needs real records. You work out your business-use percentage (office square feet divided by total home square feet), then apply it to your actual home expenses: rent or mortgage interest, property taxes, utilities, insurance, repairs that affect the whole home, and depreciation on the business portion of the house. Costs that belong only to the office, such as painting it or a dedicated business line, are 100% deductible on top.
Two limits apply under both methods. First, you only qualify if the space is used exclusively and regularly for business, either as your principal place of business or to meet clients. A desk in the corner of your living room fails that test. Second, the deduction cannot push your business into a loss. Under the simplified method, any excess is lost forever. Under the regular method, the unused part can be carried forward to a future year.
Watch out: employees cannot claim the US home office deduction at all. Since the 2017 tax reform suspended the miscellaneous itemised deduction for employee expenses, the deduction is only available to self-employed people and partners. If you work from home for an employer, this section does not apply to you.
You choose a method each year by using it on your timely filed original return, and you can switch from year to year. Once you file with one method for a tax year, you cannot change it for that year.
HMRC flat rate vs actual costs in the UK
HMRC runs a simplified expenses scheme for the self-employed. Instead of apportioning real bills, you claim a flat monthly rate based on how many hours you work from home each month:
| Hours worked at home per month | Flat rate | Yearly total |
|---|---|---|
| 25 to 50 | £10 per month | £120 |
| 51 to 100 | £18 per month | £216 |
| 101 or more | £26 per month | £312 |
You need to work at least 25 hours a month from home to use the flat rate at all. The flat rate covers heating, lighting and power, but not telephone or internet: you calculate and claim the business share of those separately on top. Full guidance is in HMRC’s simplified expenses rules.
The actual method lets you claim the business proportion of your real costs: rent or mortgage interest (not capital repayments), gas and electricity, water, council tax, insurance, and maintenance. You work out the business share from the number of rooms (kitchens, bathrooms and hallways do not count) or from floor area. HMRC does not give an exact formula, but the split between business and private use must be reasonable.
Two UK-specific points matter. First, only sole traders and partnerships can use simplified expenses; limited companies cannot (a director can use the rates to work out what the company reimburses them). Second, do not claim a room as 100% business use unless it genuinely is. A room used exclusively for business can create a capital gains tax charge on part of your home when you sell it. Claiming 90% or so for a mixed-use room is the safer route.
Tip: you do not have to claim the same flat rate every month. If you work 60 hours a month for ten months (£18 x 10 = £180) and 30 hours for two months (£10 x 2 = £20), you claim £200 for the year. Track your hours month by month to get the full amount.
Keeping your household bills organised also makes your tax return easier elsewhere. If you have ever faced penalties for sloppy records, see what to do if you missed the Self Assessment deadline.
What does the ATO allow for Australian home offices?
The ATO offers two methods for the 2025-26 income year: the fixed rate method at 70 cents per work hour, covering electricity, gas, internet, phone and stationery with depreciation claimed separately, or the actual cost method, where you claim the work-related share of every running expense with full records.
The fixed rate method is the Australian equivalent of a simplified method, and both employees and sole traders can use it. You multiply every hour you actually worked from home by 70 cents. Work 1,000 hours from home in the year and the deduction is $700. That rate covers electricity and gas, internet, phone, stationery and computer consumables. Depreciation of office furniture and equipment is claimed separately on top. The current rules are published on the ATO fixed rate method page.
The catch is records. The ATO does not accept estimates of your hours. You need a contemporaneous record, such as a timesheet, diary, roster or app log showing when you started and finished, plus at least one bill for each type of expense the rate covers.
The actual cost method lets you claim the work-related proportion of each running expense individually. It needs all receipts, your total work-from-home hours, and a representative four-week diary. If you have a dedicated home office you can also claim occupancy expenses such as rent or mortgage interest. It is more work, but for full-time home workers with high energy bills it usually beats 70 cents an hour.
Why does Canada only offer the detailed method?
Canada’s temporary flat rate of $2 a day up to $500 ended after 2022, so for 2024 and 2025 there is only the detailed method. Self-employed Canadians claim the business share of workspace-in-home expenses on Form T2125, based on the office’s share of the home’s total area.
To qualify, the workspace must be your principal place of business, or you must use it exclusively and regularly to meet clients. Then you calculate the business percentage: your office area divided by your home’s total finished area. A 140 square foot office in a 1,400 square foot home gives you 10%.
Eligible expenses for the self-employed include rent, mortgage interest (not capital repayments), utilities, home insurance, property taxes, maintenance, and the business share of internet and phone. If the space pulls double duty, for example an office that doubles as a guest room, you prorate further by the share of time it is used for business. As in the US, the deduction cannot create a business loss, but the unused amount can be carried forward.
Tip: sketch a simple floor plan of your home, note the measurements, and keep it with your tax records. CRA accepts both the square footage method and the room count method, and a one-page calculation ends most review questions before they start.
Worked comparison: two freelancers, real numbers
Here is how the choice plays out for two typical freelancers. All figures are annual unless stated.
Maya, UK freelancer. She works from home about 120 hours a month, so she qualifies for the top HMRC flat rate.
Simplified: £26 per month x 12 months = £312.
Actual method: she uses one room of six as an office, so the business share is roughly 1/6 (16.7%). Her heating and electricity total £2,100 for the year, and 16.7% of that is £350.70. She also claims the business share of her broadband, £180. Total actual claim: £350.70 + £180 = £530.70.
Result: the actual method gives Maya £530.70 against £312 simplified, a difference of £218.70.
Sam, US freelancer. His office is 120 square feet in a 1,200 square foot rented apartment.
Simplified: 120 sq ft x $5 = $600.
Regular method: business-use percentage is 120 / 1,200 = 10%. His actual home expenses: rent $21,600 x 10% = $2,160; utilities $4,200 x 10% = $420; renters insurance $1,800 x 10% = $180; plus repairs to the office itself, $300 at 100% = $300. Total regular claim: $2,160 + $420 + $180 + $300 = $3,060.
Result: the regular method gives Sam $3,060 against $600 simplified, a difference of $2,460. When housing costs are high, the actual method is not even close.
Knowing your full home running costs also feeds directly into your pricing. Run the numbers through LancerBill’s business pricing calculator to see how overhead like home office costs changes what you need to charge, and check how to calculate your break-even point to see the minimum income your setup requires.
How to pick the method that saves you more
Use this decision framework each tax year, because the right answer can change as your rent, bills and working hours change.
| Your situation | Usually better | Why |
|---|---|---|
| Small office, low housing costs, hate paperwork | Simplified | The flat rate is close to your real costs, and your time is worth more than the difference |
| Renting in an expensive city | Actual | High rent apportioned at 10-20% dwarfs any flat rate |
| Own a home with big utility bills | Actual | Utilities, insurance and depreciation add up fast |
| Work from home only a few hours a week | Simplified | Small hours mean the flat rate covers most of the claim |
| UK, work under 25 hours a month from home | Neither | You are below HMRC’s minimum threshold for simplified expenses |
| Planning to sell your home soon (UK) | Simplified | Avoids the exclusive business use that can trigger capital gains tax on sale |
The honest approach is to run both calculations once a year and take the higher number. The simplified method takes five minutes. If the actual method beats it by more than the value of an hour of your time, do the actual method.
Mistakes that cost people their claim
Watch out: double-dipping. Under Australia’s fixed rate method, you cannot claim electricity, internet, phone or stationery separately, because the 70 cents an hour already covers them. Only depreciation of equipment and repairs can be claimed on top.
Other common mistakes: claiming 100% of a spare room that guests sleep in (every tax authority prorates for dual use, and an exclusive-use claim can create a CGT problem on a UK home sale); US employees trying to claim at all; UK freelancers forgetting that phone and internet must be claimed separately from the flat rate; and Australians estimating hours instead of keeping a diary, which the ATO explicitly rejects.
Finally, keep your records for as long as your tax authority requires, usually several years after filing. A simple folder with bills, measurements and a floor plan sketch is enough.
Home office costs are overhead like any other, so make sure your rates cover them. Use the freelance rate calculator to fold your true costs into your hourly rate, and the break-even calculator to check your monthly income floor.
Key takeaways
- The simplified method (US: $5/sq ft up to $1,500; UK: £10-£26/month; Australia: 70c/hour) is fast and needs minimal records, but it is capped.
- The actual method apportions your real home costs by the business share of your home, has no cap in most countries, and usually gives the bigger deduction when rent or bills are high.
- You can switch methods each year in the US, UK and Australia, so recalculate annually rather than sticking with last year’s choice.
- Canada has no simplified option since its $500 flat rate ended after 2022; only the detailed method remains.
- Never claim a space as 100% business if it has any personal use, and in the UK avoid exclusive-use claims if you plan to sell your home.
- Run both calculations each year and take the higher number; if the gap is small, the simplified method buys back your time.
Frequently asked questions
Can I switch between the simplified and actual method each year?
Yes. In the US you choose a method each year on your original return and can switch annually. The UK lets you choose between flat rates and actual costs each tax year, and Australia lets you pick either method for each income year. Recalculate both every year, because changes in rent, bills or working hours can flip which one wins.
Can employees claim the home office deduction?
It depends on the country. In the US, employees cannot claim it at all since 2018; it is only for the self-employed. In the UK, employees can claim £6 a week through their employer or HMRC if they are required to work from home. In Australia, both employees and sole traders can use the fixed rate or actual cost method. In Canada, employees need a signed Form T2200 from their employer.
Will claiming a home office affect capital gains tax when I sell my home?
Possibly. In the UK, using a room exclusively for business can make part of your home liable to capital gains tax on sale, which is why claiming a room at around 90% or using the flat rate is safer. In the US, depreciation claimed under the regular method is subject to depreciation recapture when you sell. In Australia, claiming running expenses does not trigger capital gains tax, but claiming occupancy expenses such as mortgage interest can affect your main residence exemption.
What records do I need for each method?
For simplified methods you need little: your office measurements (US), hours worked from home (UK, Australia), or nothing beyond the basics (UK flat rate needs no bills at all). For actual methods you need receipts for all home expenses, measurements or a floor plan of your home, and in Australia a record of your actual work-from-home hours plus a representative four-week diary.
Can the home office deduction create a tax loss?
Generally no. In the US the deduction cannot reduce your business net profit below zero; under the simplified method any excess is lost, while under the regular method it carries forward. In Canada the claim cannot create a business loss but can be carried forward to future years. In the UK and Australia, home office costs simply reduce your taxable profit, so keep them realistic.
This guide is for general information only and is not financial, tax or legal advice.