UK WFH Tax Relief Calculator (Abolished April 2026)

Working From Home Tax Guide

What do I need to know about WFH Relief Was Abolished from 6 April 2026?

HMRC abolished working-from-home tax relief for employees from 6 April 2026, so no new claims can be made for the 2026/27 tax year or later. This applies to all employees, including those contractually required to work from home — not just those who chose to. HMRC made the change after finding high levels of non-compliance, with over half of reviewed claims found to be ineligible. Crucially, the relief isn't entirely closed off: you can still submit a claim for the 2025/26 tax year (which ended 5 April 2026), and you can make retrospective claims for up to four earlier tax years if you were eligible and didn't claim at the time — so claims going back through the COVID-era years may still be worth making before each year's deadline passes. For reference, the relief that applied up to 5 April 2026 was: flat rate £6 per week (£312 per year) with no receipts required, worth about £62/year to a basic-rate taxpayer and £125/year to a higher-rate taxpayer; or actual additional costs if higher (see below). Use this calculator to value any retrospective claim you're still entitled to make. Going forward, the main routes for home-working costs are employer reimbursement (your employer can still pay up to £6/week tax- and NI-free — see 'How to Claim') and, for the self-employed, the separate home-working expense rules (unaffected by this change — see the self-employed section).

What do I need to know about Actual Costs Method?

If additional household costs exceed £6/week, you can claim actual costs. Allowable costs: heating and electricity for the room used for work (proportionate to time and space). Business telephone calls (not line rental). Broadband (only the business-use proportion). NOT allowable: mortgage or rent. Council tax. General home insurance. Costs that would exist regardless of working from home. How to calculate proportionate costs: heating bill × (hours working from home / total hours per year) × (rooms used for work / total rooms in the home) gives the deductible proportion for each qualifying bill.

How to Claim (Retrospective) and the Employer Route?

For retrospective claims covering tax years up to and including 2025/26, the routes are unchanged: through Self Assessment (add the expense in the employment section), via form P87 (online or paper) if you don't do Self Assessment, or through your HMRC online personal tax account under 'claim tax relief for your job expenses'. Check each tax year's claim deadline — claims can generally be made up to four years after the end of the relevant tax year, so older years expire first. Also check your tax code: if you claimed WFH relief in the past and the allowance is still baked into your 2026/27 tax code, it will now be wrong — contact HMRC to have it removed so you aren't under-taxed and landed with a bill later. Going forward, the employer route is the main option: your employer can pay you up to £6/week (£312/year) towards home-working costs free of tax and National Insurance, without you needing receipts. This is an employer decision, not an automatic entitlement, so it's worth asking whether your employer will reimburse home-working costs now that the personal relief has gone. Larger actual-cost reimbursements are also possible tax-free where genuinely incurred and evidenced.

What's the key thing to understand about Contractor and Self-Employed WFH?

Self-employed (sole trader, partnership): can claim a proportion of household costs as a business expense. Simplified method: HMRC flat rate based on hours worked from home. 25-50 hrs/month: £10/month. 51-100 hrs/month: £18/month. 101+ hrs/month: £26/month. Actual cost method: calculate the business proportion of all relevant costs. Limited company director: must be a formal contractual requirement to work from home. Director can charge the company a room rental (at market rate) — taxable as rental income personally, but deductible as a business expense for the company, which can be a genuinely tax-efficient structure when done correctly and at a fair market rate.

Employer-Paid WFH Allowances vs Tax Relief: What's the Difference

Tax relief and an employer's home-working allowance are two different mechanisms that are easy to confuse. Tax relief, whether claimed through a flat weekly amount or actual costs, reduces the income tax you owe by letting you deduct eligible home-working expenses before tax is calculated, with HMRC effectively refunding a percentage of the relevant costs via your tax code or a repayment. An employer-paid allowance is different: it's a payment the employer makes directly to the employee to cover the additional costs of working from home, and when paid within the exempt threshold, it isn't treated as taxable income at all, so no tax relief claim is needed for that portion. The two aren't meant to be combined for the same costs; if an employer already pays a tax-free allowance, claiming further relief for the same expenses from HMRC isn't appropriate. Where an employer pays less than the full exempt allowance, or none at all, an employee working from home under a formal arrangement may still be able to claim relief on the shortfall, provided the other eligibility conditions for working-from-home relief are met.

How Hybrid Working Patterns Affect What You Can Claim

Hybrid working, splitting time between home and an office, complicates WFH relief because eligibility has generally depended on the arrangement being required by the employer rather than a personal choice. Where an employee works from home voluntarily, for convenience or a shorter commute, relief has typically not applied, even if real additional costs are being incurred on those days. Where homeworking is written into the employment contract or is a genuine requirement because the employer has no suitable office space, the relief has applied more straightforwardly. For actual-costs claims, hybrid workers generally need to apportion costs by the proportion of time spent working from home, since only the additional costs attributable to home-working days count, not a full month's share of bills for someone who is only home two days a week. This apportionment is one of the more error-prone parts of an actual-costs claim, and keeping a simple log of home-working days across the tax year makes it far easier to support a claim if HMRC later asks for evidence of how the figure was calculated.

Flat Rate vs. Actual Costs vs. Employer Allowance: Side-by-Side

There are three distinct routes for recovering some of the cost of working from home, and they are not interchangeable — you (or your employer) pick one method per tax year, and mixing them incorrectly is a common source of HMRC queries.

The flat rate is designed to be effortless but usually under-compensates anyone with meaningfully higher bills from homeworking; the actual costs method takes more record-keeping but can be worth significantly more if your office space and hours are substantial. Worked Example: Calculating Actual Costs for a Spare Room Office Consider a three-bedroom house of 90m² total floor area, where a 10m² spare room is used as a dedicated office five days a week. Annual combined heating and electricity bills are £1,800. The allowable business proportion is calculated by floor area and time: (10m² / 90m²) x (5 days / 7 days) = 11.1% x 71.4% = 7.9%. Applying that proportion to the £1,800 annual bill gives £1,800 x 7.9% ≈ £142 of allowable costs for the year. Relief is given at your marginal income tax rate, so a basic-rate (20%) taxpayer saves £142 x 20% = £28.40 in tax, while a higher-rate (40%) taxpayer saves £142 x 40% = £56.80 — a modest but genuine saving that scales up considerably for someone with a larger dedicated office space or higher energy bills.

Record-Keeping Tips for an Actual-Costs Claim

Because the actual-costs method requires evidence rather than a flat assumption, keeping good records as you go is far easier than reconstructing them at tax-return time. Useful records include: a simple floor-plan sketch showing the office room's area relative to the whole home, a note of which days and roughly how many hours per day you work from that room each week, and copies of utility bills covering the claim period. Where usage genuinely varies by season (more heating in winter, for instance), keeping quarterly rather than annual bill totals lets you apply a more accurate proportion rather than one flat annual estimate. If your work pattern changed during the year — for example, moving from five days a week in the office to a hybrid two-day pattern partway through — splitting the claim into two periods with different day-fraction calculations, rather than averaging across the whole year, generally produces a more defensible and often larger claim.