Home office costs: the two HMRC methods explained

Home office costs: the two HMRC methods explained

If you work from home, HMRC lets you claim a share of your household costs against your business income. Heating, lighting, phone, broadband, and part of the rent or mortgage interest all count, within limits. There are two approved ways to calculate the claim. One takes seconds. The other takes bookkeeping but can be worth far more. Here is how to choose.

Method one: the simplified flat rate

The simplified method pays a fixed monthly amount based on your hours of home working. Work between 25 and 50 hours a month from home and you claim £10 a month. Work 51 to 100 hours and it is £18 a month. Work 101 hours or more and it is £26 a month. No bills to apportion, no room measurements, no arguments with HMRC about what share of the electricity belongs to the business. Your diary or timesheets evidence the hours, and the rate is set by HMRC. For anyone working a couple of days a week from the spare room, this is the sensible default. It is also the safer option if your records are thin, because there is almost nothing for an enquiry to pick apart.

Method two: actual costs, fairly apportioned

The actual costs method adds up your real bills and claims a reasonable business proportion. Allowable costs include heating and lighting, metered water, business phone calls and broadband, and a share of rent or mortgage interest. You apportion them, usually by the number of rooms in the house or by floor area, and then by the time the room is used for business. A dedicated study used full time for the business can produce a claim several times the £26-a-month flat rate, especially with current energy prices. The price is record keeping: you need the bills, a consistent apportionment, and a log of business use. HMRC can ask to see the working behind the number, and a claim built on round-number guesswork is the first casualty of any check.

The dedicated-room test

Both methods hinge on one question: is the space genuinely used for business? A spare bedroom converted to an office and used only for work passes without argument. The dining table, cleared for meals each evening and used by the family at weekends, does not, because HMRC only allows costs that are wholly and exclusively for the business, and dual-purpose use fails that test. Exclusivity matters more than size. If you are claiming actual costs for a room, be honest about who else uses it and when. A room that doubles as a guest bedroom for two weeks a year needs its claim adjusted for those weeks, or a note explaining why not.

What you cannot claim

Some costs never qualify under either method. Council tax and buildings insurance relate to the home as a residence, not to the business, so they stay out. Mortgage capital repayments are out too; only the interest element counts. Full telephone line rental is generally disallowed, though the business proportion of calls and broadband is fine. And think twice before claiming a large share of rent or mortgage interest: if a room is treated as used significantly for business, it can affect the capital gains tax position when you sell the home, because that part of the property may not qualify for full private residence relief. That is a conversation to have with your adviser before the claim gets ambitious, not after the sale.

Limited company directors: put it in writing

If you operate through a limited company, the company is a separate person from you, so the claim works differently. The company can pay you rent for the home office under a simple licence agreement, or reimburse the costs you incur. Either way, write it down: the rooms covered, the amount, and the basis of calculation. Keep it at a commercial level and review it yearly. Many directors use the simplified method through the company to keep life simple, which is perfectly legitimate. Whatever you choose, document it before the year end, not when the accounts are being prepared. For practical help with claims like these, Finex Outsourcing supports UK businesses with corporation tax and self assessment.

Run both methods on your own numbers once a year. The flat rate usually wins on simplicity. But if you have a dedicated office, high energy bills, and tidy records, the actual costs method can be worth several hundred pounds a year more.

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