How to Claim Tax Relief on Working From Home in the UK

The £6 a Week That Most Home Workers Never Claim

You’ve been working from the spare bedroom since 2020. The desk is permanent now, the office chair cost you £280, and your energy bills have gone up noticeably since you stopped commuting to an office five days a week. And yet, when your self-assessment return comes round each January, you skip past the section about working from home expenses because you’re not entirely sure what counts, what doesn’t, and whether the hassle is worth it for what feels like a small amount of money.

It is worth it. For employed workers, HMRC offers a flat rate of £6 per week — £312 a year — with no receipts required. That translates to a tax saving of £62.40 if you’re a basic-rate taxpayer, or £124.80 at the higher rate. Not life-changing on its own, but if you’ve never claimed and you’ve been eligible since the 2020/21 tax year, you could be sitting on a backdated refund of over £700. For self-employed workers, the numbers can be considerably larger, because you’re allowed to claim a proportion of actual household running costs — heating, electricity, broadband, council tax, even mortgage interest in some cases — against your trading profits.

The rules are not complicated, but they are specific. Getting them wrong means either leaving money on the table or, worse, making a claim that HMRC later challenges. Neither outcome is ideal.

Who Actually Qualifies — and Who Doesn’t

HMRC’s eligibility test is stricter than most people assume. Working from home by choice does not automatically entitle you to tax relief. The key phrase in HMRC’s guidance is that you must work from home because your employer requires it, or because the nature of your job means you have no reasonable alternative. If your employer provides you with an office and you simply prefer working from the kitchen table, you don’t qualify. This caught a lot of people out after the pandemic, when many employers shifted to hybrid arrangements — offering the option to work from home without mandating it.

There are, however, several scenarios where the claim is straightforward. If your employment contract states that your home is your primary workplace, you’re eligible. If you’re a self-employed sole trader or partner who uses part of your home for business, you’re eligible. If your employer has no office space available for you — common with smaller firms and fully remote roles — you’re eligible. Teachers, academics, and other professionals who regularly work from home in the evenings or at weekends to complete duties that cannot reasonably be done at their workplace also qualify, though they need to demonstrate that this isn’t simply a matter of personal preference.

One area where people frequently trip up: if your employer already pays you a tax-free allowance for working from home (up to £6 per week or £26 per month), you cannot claim additional relief from HMRC on top of that. It’s one or the other, not both.

The Flat Rate Method: Simple but Limited

For employees, the flat rate is the path of least resistance. HMRC allows you to claim £6 per week (£312 per year) without providing any evidence of actual expenditure. You don’t need to calculate your electricity bill or prove that your broadband costs went up. The relief is applied against your income, so you save tax at your marginal rate — 20% for basic-rate taxpayers, 40% for higher-rate, and 45% for additional-rate taxpayers. A higher-rate taxpayer claiming for the full 2025/26 tax year saves £124.80. Not enormous, but it takes about ten minutes to set up.

You can claim the flat rate through the government’s online portal at gov.uk/tax-relief-for-employees/working-at-home. If you’re already registered for self-assessment, you can include it on your tax return instead. HMRC will adjust your tax code for the current year, which means slightly more take-home pay in each payslip rather than a lump sum refund — unless you’re backdating, in which case the overpaid tax comes back as a refund.

Here’s the thing though — the flat rate hasn’t increased since April 2020. Before that it was £4 per week. Given that domestic energy prices have risen by roughly 50% since 2020 according to Ofgem’s price cap history, the £6 figure is looking increasingly inadequate. If you’re a self-employed worker with genuine home office costs, you should almost certainly be using the actual cost method instead.

Actual Costs: Where the Real Savings Are

Self-employed individuals have a choice. You can use the simplified expenses flat rate (£10 per month for 25–50 hours of home working, £18 for 51–100 hours, or £26 for 101+ hours), or you can calculate and claim your actual allowable proportion of household running costs. For most people who work from home regularly, actual costs produce a significantly larger deduction.

The calculation works like this. You identify the total annual cost of each allowable expense category: gas, electricity, water rates, council tax, home insurance, broadband, telephone, and — if you’re a homeowner — mortgage interest (not capital repayments, only the interest portion). You then calculate a reasonable proportion attributable to business use. HMRC accepts two common methods for determining that proportion: the room-based method (if you use one room of a six-room house exclusively for work, that’s roughly one-sixth of eligible costs) or the time-based method (if you work 40 hours a week in a room that’s used 80 hours a week total including personal use, that’s 50% of one room’s share).

To give you a concrete example: suppose your annual household running costs total £14,000 (gas £1,200, electricity £1,400, council tax £2,100, water £500, broadband £480, home insurance £320, mortgage interest £8,000). You work from a dedicated home office that represents one-fifth of your home’s usable floor area, and you use it exclusively for business 40 hours a week out of a possible 112 waking hours. Your claimable proportion might be calculated as 1/5 × 40/112 = roughly 7.1%. That gives you a deduction of about £994 — more than three times the simplified flat rate of £312. On a 40% tax rate, that’s a saving of nearly £398, compared to £124.80 under the flat rate.

The trade-off is record-keeping. You need receipts, utility statements, and a log of your working hours. With Making Tax Digital now applying to self-employed individuals with turnover above £50,000 from April 2026, most sole traders should already be maintaining digital records through compatible software like FreeAgent, Xero, or QuickBooks. If you’re already doing that, carving out home office costs is a relatively small additional effort. But if your records are a shoebox of crumpled receipts, the simplified rate might genuinely be the better option — not because it saves more, but because it doesn’t invite HMRC to look more closely at your bookkeeping.

What You Can and Cannot Claim

The allowable categories are broader than many home workers realise, but there are firm boundaries. Heating, lighting, and power for your workspace are allowable. So is your business proportion of broadband and telephone costs, including your mobile if you use it for work calls. Council tax and water rates can be included in the actual cost calculation. Mortgage interest — the interest component only, never the capital repayment — is allowable for self-employed individuals, though employed workers using the flat rate method cannot claim mortgage interest separately.

Home insurance is allowable in proportion to business use. Cleaning costs for your workspace are allowable. If you’ve converted a room specifically for business use and needed minor works — a new power socket, better lighting, an additional radiator — those costs may be deductible, though HMRC treats capital improvements differently from running costs, so anything structural (a loft conversion to create an office, for example) would typically need to be claimed as a capital allowance rather than a revenue expense.

What you absolutely cannot claim: food and drink (even if you’d have bought lunch at a cafe near the office), clothing (unless it’s a genuine uniform or protective equipment), the purchase price of your home, or any costs that are purely personal. A common grey area is office furniture. If you’re self-employed and buy a desk and chair specifically for your home office, that’s a legitimate business expense — but it’s claimed as a capital allowance under the annual investment allowance, not as a home working cost. Employees can claim tax relief on equipment their employer requires them to buy but doesn’t reimburse, though this goes through a separate section of the self-assessment return (employment expenses, not home working).

Backdating Your Claim

If you’ve been working from home and never claimed, you can backdate. Employed workers can go back four tax years from the current year. As of the 2026/27 tax year, that means you can still claim for 2022/23, 2023/24, 2024/25, and 2025/26. At the flat rate of £6 per week, that’s up to £1,248 of deductions across four years, saving a basic-rate taxpayer approximately £249.60 or a higher-rate taxpayer £499.20. Self-employed individuals file annual returns, so any unclaimed home office deductions from prior years would need to be corrected by amending those returns — again within the four-year window.

The process for employed workers is straightforward. Go to gov.uk and use the “Check if you can claim tax relief for working from home” tool. It walks you through the eligibility questions, confirms the amount, and — if you’re due a refund for prior years — HMRC will issue it directly. Turnaround is typically six to eight weeks, though during busy periods (January to March) it can stretch longer. For self-employed individuals, amendments to prior year returns are done through your Government Gateway account or your accountant.

One thing to be aware of: HMRC tightened its guidance after the pandemic years. During 2020/21 and 2021/22, the eligibility criteria were relaxed significantly — essentially anyone who worked from home for even one day could claim the full year’s flat rate. That concession ended on 6 April 2022. From the 2022/23 tax year onwards, the standard rules apply: your employer must require you to work from home, or you must have no reasonable alternative workplace.

The Capital Gains Tax Trap Nobody Mentions

This is the counter-point that most “claim your tax relief” articles conveniently skip. If you designate part of your home as used exclusively for business, you may lose a portion of your principal private residence relief when you eventually sell the property. Under normal circumstances, your main home is completely exempt from capital gains tax (CGT). But if one room is used exclusively and solely for business — not occasionally, not partly, but exclusively — HMRC can argue that the business portion of any gain on sale is chargeable to CGT at 18% (basic rate) or 24% (higher rate) for residential property.

The operative word is exclusively. If your home office doubles as a guest bedroom, a children’s playroom at weekends, or a general family space outside working hours, you’re generally fine — the dual-use nature preserves your PPR relief. But if you’ve gone so far as to install a separate entrance, put a lock on the door, and claimed the room has no personal use whatsoever, you’re potentially creating a CGT liability on sale. On a property that’s gained £200,000 in value, losing PPR relief on one-fifth of the home could mean a CGT bill of £9,600 at the higher rate. That rather dwarfs the annual tax savings from claiming home office costs.

The practical advice: claim your home working costs, but don’t claim exclusive use unless the room genuinely is used only for business and you’ve factored the CGT implications into your financial planning. Most home workers are better off maintaining some personal use of their workspace, which keeps the PPR relief intact while still allowing a reasonable proportion of costs to be claimed.

Making Tax Digital and Record-Keeping

From April 2026, Making Tax Digital for Income Tax Self-Assessment (MTD for ITSA) applies to self-employed individuals and landlords with gross income above £50,000. The threshold drops to £30,000 from April 2027. This means quarterly digital reporting through HMRC-compatible software, and it makes accurate categorisation of home office expenses more important than ever. Under MTD, you’ll be submitting quarterly updates of your income and expenses, so having your home working costs properly allocated — either as simplified expenses or actual costs — needs to be baked into your ongoing bookkeeping, not cobbled together at year-end.

If you’re currently using spreadsheets, now is the time to switch to MTD-compatible software. FreeAgent (from £19 per month, free with NatWest and RBS business accounts), Xero (from £16 per month), and QuickBooks Self-Employed (from £8 per month) all handle home office expense allocation. FreeAgent is particularly strong here — it has a dedicated home office percentage calculator built into the expenses module. Set it up once, tag your utility bills as they come in, and the quarterly figures are generated automatically.

For employed workers, MTD doesn’t apply directly — your employer handles PAYE. But if you’re claiming employment expenses through self-assessment (because your employer doesn’t reimburse home working costs), you still need to keep records for six years in case HMRC asks to see them.

Step-by-Step: Making Your Claim

Employed workers (flat rate)

Visit gov.uk/tax-relief-for-employees/working-at-home. Confirm that your employer requires you to work from home or that you have no alternative workplace. Select the tax years you’re claiming for. HMRC will adjust your tax code (for the current year) or issue a refund (for prior years). The whole process takes about ten minutes and doesn’t require any supporting documentation unless HMRC queries it later, which is rare for flat-rate claims.

Self-employed (simplified expenses)

Record your average monthly working-from-home hours. On your self-assessment return, enter the total under simplified expenses: £10/month for 25–50 hours, £18 for 51–100 hours, £26 for 101+ hours. No receipts needed, but keep a log of your working hours.

Self-employed (actual costs)

Gather annual totals for gas, electricity, water, council tax, broadband, phone, insurance, and mortgage interest. Calculate your business-use proportion (room fraction × time fraction). Enter the total claimable amount on your self-assessment return under “other allowable business expenses.” Keep all utility statements, receipts, and your calculation methodology for at least six years — HMRC can and does enquire into home working claims, particularly where the amounts are significant relative to turnover.

When to Get Professional Help

For a straightforward employed worker claiming the £6 flat rate, you don’t need an accountant. For a self-employed individual with a dedicated home office, moderate-to-high household costs, and a property that’s appreciated significantly in value, spending £200–£400 on a one-off consultation with a chartered tax adviser (look for CTA or ATT qualifications) is money well spent. They can model the interaction between your home office claim, your CGT position, and your overall tax efficiency in a way that generic online guidance simply cannot. The Association of Taxation Technicians (att.org.uk) and the Chartered Institute of Taxation (tax.org.uk) both maintain searchable directories of qualified advisers.

If your annual home working deduction would exceed £2,500, or if you’re planning to sell your home within the next five years and have claimed exclusive business use, professional advice isn’t optional — it’s the difference between a net tax saving and an accidental liability that costs you more than you ever saved.