guides
20 December, 2019
4 min read

How do you calculate working from home expenses?

Lily Smith

One of the many benefits of working from home is that you can claim some of your household costs back as expenses. Working out how much you can claim can be a bit tricky, but it’ll save your business money in the long run. Here’s a simple guide to calculating your home office expenses – grab your calculator and dive in!

Simplified expenses for sole traders

If you’re a sole trader, you can use simplified expenses to calculate some of your business expenses. These are flat rates that are set by HMRC – they’re a simpler way of calculating expenses, instead of working out your actual business costs.

    You can use flat rates to calculate costs like these:
  • Business usage of your vehicles
  • Using your home as a workplace
  • Living in your business premises (eg if you run a guesthouse or a small care home)

But you’ll still need to work out the actual costs for the rest of your business expenses, including things like phone bills, internet and equipment costs, staff expenses and marketing expenses.

Flat rates explained

These HMRC flat rates are based on the number of hours you work from home each month.
Hours of business use per monthFlat rate per month
25 to 50£10
51 to 100£18
100 and more£26

Actual costs for sole traders

If you prefer to work out your actual costs, you’ll have to calculate the total cost of running your home (including mortgage/rent and utilities) and then deduct the business proportion of those costs. It’s a lot more effort than simplified expenses, but it could mean a larger amount goes towards your claim.

For example, you have 5 rooms in your house and use one as a home office.

Your electricity bill for the year is £500. If all the rooms use the same amount of electricity, you could claim £100 as allowable expenses (£500 divided between 5).

Then work out how many days per week you use your room as a home office, and divide the allowable expense amount accordingly.

If you work from home 2 days per week, divide 100 by 7 and then multiply it by 2 to get your annual business electricity expense.

Use HMRC’s simplified expenses checker to compare what you can claim using simplified expenses against a claim based on your actual costs. This should help you decide whether simplified expenses will suit your business.

Home office expenses for limited companies

If you’re a limited company, there are two ways of working out your home office expenses.

  • HMRC’s flat rate system
  • A rental agreement between yourself and your limited company

HMRC’s flat rate for the additional costs of running your business from home allows you to claim £4 per week, which adds up to £208 for the year. You don’t need receipts to prove these expenses, and this fee can be included alongside anything else you are claiming.

Did you know?
If you run a limited company, you can rent your home office out to your business and potentially save yourself a few quid.

If you do decide to rent your home office to your own limited company, you may be able to claim more than £208 every year. If you choose to do this, make sure you have a formal agreement in place between yourself (as the homeowner) and your limited company. Otherwise, HMRC could classify the rent you receive from your limited company as additional salary.

What about the rest of your allowable business expenses as a limited company?

Well, you can deduct any business costs from your profits before they’re taxed. But you have to report any item you make personal use of as a company benefit.

Read all about it

Running a limited company? You’ll also need to pay Corporation Tax

Get the low down

Fancy a hand?

Need a way to look after all your newly-discovered expenses? ANNA can sort everything out for you!
Try ANNA for 3 months