The kitchen table has become your desk, the spare room is where client calls happen, and your energy bill has crept up. It is only natural to ask, can I claim home office costs against tax? In many cases, yes. But the right method depends on whether you are a sole trader, run a limited company or are employed by someone else.
The good news is that this does not need to become another complicated admin job. The aim is simply to claim a fair amount for the genuine extra costs of working from home, while keeping records that make sense if HMRC ever asks questions.
Can I claim home office expenses as a sole trader?
If you are self-employed and regularly work from home, you can normally claim a proportion of relevant household costs through your Self Assessment tax return. This applies whether you use a dedicated office or work from a shared room, provided your claim reflects business use rather than private use.
There are two main ways to work it out: the simplified expenses method or a calculation based on actual costs. You can choose the method that is most appropriate for your business and records.
The simple flat-rate method
Simplified expenses use a monthly flat rate based on the number of hours you work from home each month. This covers household running costs such as heating, lighting and power, rather than every expense connected with your home.
The current rates are £10 a month for 25 to 50 hours, £18 a month for 51 to 100 hours, and £26 a month for 101 hours or more. These figures are straightforward, which can make them a sensible option for a busy sole trader with modest homeworking costs.
You cannot use the flat rate to claim rent, mortgage interest, council tax or internet and telephone costs. Those may be claimable separately where there is a genuine business element, but they need their own reasonable calculation.
Claiming a share of actual household costs
The alternative is to work out the business proportion of your actual household bills. Depending on your circumstances, relevant costs may include rent, mortgage interest, gas and electricity, water, council tax, home insurance, broadband, cleaning and repairs.
A fair calculation usually considers the number of rooms in the property and how often a room is used for business. For example, if you work in one room of a five-room home for five days a week, it may be reasonable to claim a proportion of eligible costs based on that use. A room that is also used as a family dining room should not be treated as a full-time office.
There is no single percentage that works for everyone. The important thing is that you can explain your approach and that it does not overstate the business use. Keep copies of bills, your calculation and a note of the period it covers. A simple spreadsheet can be enough.
Mortgage capital repayments are not an allowable expense. If you own your home, it is the interest part of mortgage payments that may be relevant, not the amount paying off the loan itself.
What if I run a limited company from home?
A limited company is separate from you personally, even if you are the only director. That means home office costs need to be handled a little differently.
The simplest route is often for the company to reimburse you for additional household expenses caused by working from home. A company can usually pay a director or employee up to £6 a week, or £26 a month, without needing receipts or creating a taxable benefit. This is designed to cover the extra cost of heating and lighting your home while you work.
Where your genuine additional costs are higher, the company may reimburse more, but you should keep evidence of the amount and how it was calculated. The expense should be extra expenditure created by working at home, rather than a share of a bill you would have paid anyway. For example, increased electricity use may be relevant; your entire household broadband package is unlikely to be.
Some directors consider charging rent to their company for use of a room at home. This can work in certain situations, but it is not usually a quick win. Rental income may need to be declared personally, and an arrangement giving the company exclusive use of part of your home can create capital gains tax considerations when you sell. There may also be business rates issues in unusual cases.
For most small owner-managed companies, the £6 weekly payment or a carefully evidenced reimbursement is the cleaner, lower-risk option. It is worth getting tailored advice before setting up a rental agreement.
Can employees claim for working from home?
Employees can be reimbursed by their employer for qualifying homeworking expenses, including up to £6 a week without receipts. However, tax relief through an employee’s own tax position is more restricted than many people expect.
Generally, you must be required to work from home by your employer for tax relief to apply. Choosing to work at home for convenience, or because a hybrid arrangement suits you, does not automatically create a claim. There also needs to be no suitable workplace available for you to do the work.
The temporary, more generous rules that applied during the pandemic do not continue as a general entitlement. If you are unsure, ask your employer first whether they have a homeworking expenses policy.
What home office costs should you keep separate?
A common mistake is putting every home-related payment through the business. Your weekly food shop, household contents you use personally and the full cost of your mortgage are not business expenses just because you answer emails at home.
It helps to separate costs into three groups: expenses that are wholly for the business, shared expenses that need a fair business proportion, and personal expenses that should stay out of the accounts. A dedicated business mobile phone or a desk bought only for work may be easier to justify than a broad percentage of general household spending.
Office equipment such as a laptop, monitor, printer, desk or chair may be claimable too, but the tax treatment can differ from regular running costs. If an item has mixed personal and business use, only the business element should be claimed. Higher-value equipment may qualify for capital allowances rather than being treated as an everyday expense.
Records matter more than a perfect formula
HMRC does not expect every small business owner to create a laboratory-grade calculation for the cost of boiling a kettle. It does expect claims to be reasonable, consistent and supported by records.
Keep invoices and bills, record the hours you work at home if you use simplified expenses, and write down how you arrived at any percentage. Review the figure if your circumstances change. Moving house, converting a spare room into an office, taking on staff or working more days away from home can all affect what is fair.
For limited company directors, make sure reimbursements are recorded correctly in the bookkeeping. Paying yourself from the company account without a clear description can create confusion in the director’s loan account and make year-end accounts harder than they need to be.
A practical way to make your claim
Start by identifying your business structure, then choose the least complicated method that gives a fair result. For a sole trader with occasional homeworking, simplified expenses may be enough. For someone running a consultancy from a home office most days, an actual-cost calculation could be more suitable. For a company director, the modest weekly reimbursement is often the most straightforward place to begin.
The best claim is not necessarily the biggest one. It is the one that reflects how you actually work, is properly recorded and gives you confidence that your accounts are accurate. If the calculations are starting to take more time than they save, a friendly bookkeeping review can bring clarity and keep your finances stress-free.