Home Office Expenses: How to Claim When Working From Home Through Your Ltd Company

Running your limited company from home offers genuine tax advantages that many directors fail to claim. Whether you work from a dedicated home office or use the kitchen table, HMRC allows your company to reimburse you for the additional costs of working from home—tax-free.

This guide explains both claiming methods, helps you calculate the optimal approach, and highlights the pitfalls that could create unexpected tax liabilities.

Two Methods: Flat Rate vs Actual Costs

As a director of a UK limited company, you have two legitimate ways to claim home office expenses. The company pays you for using your home as a workplace, and this payment is tax-free to you whilst being deductible for Corporation Tax purposes.

Both methods are HMRC-approved. The right choice depends on your working pattern, home running costs, and appetite for record-keeping.

The £6 Per Week Flat Rate (£312/Year)

The simplest approach is the HMRC-approved flat rate of £6 per week. Your company pays you £6 for every week you work from home, totalling £312 per year.

How It Works

• Your company pays you £6 per week (or £26 per month)
• You receive this money tax-free—no Income Tax or National Insurance
• The company claims it as a business expense, reducing Corporation Tax by approximately £78 per year (at 25% Corporation Tax rate)
• No receipts, calculations, or records required

Who Should Use the Flat Rate?

The flat rate wins when:

• Your home running costs are relatively low
• You work from home only part of the time
• You value simplicity over maximising claims
• You use a shared space rather than a dedicated office

Important: The £6 rate hasn't increased since 2020 despite significant rises in energy costs. If you have substantial home working, the actual costs method often delivers significantly more.

Actual Costs Method: Calculating Your Claim

The actual costs method requires more effort but can deliver significantly higher tax-free payments. You calculate the genuine business proportion of your household running costs and have the company reimburse you.

What You Can Claim

What You Cannot Claim

Calculating Your Business Proportion

HMRC accepts two reasonable methods for calculating what proportion of your home costs relate to business use.

Room Method

Divide your workspace by the total number of rooms in your home.

Example: You have a 3-bedroom house with:

• 2 reception rooms
• Kitchen
• 3 bedrooms
• 1 bathroom

That's 7 rooms. If you use one bedroom as your office, your proportion is 1/7 = 14.3%.

Hours Method

Calculate what percentage of the week your home is used for business.

Example: You work 40 hours per week from your home office.

• Total hours in a week: 168
• Business hours: 40
• Time proportion: 40/168 = 23.8%

Combined Calculation

For most expenses, HMRC expects you to apply both proportions:

Business proportion = Room proportion × Time proportion

Using the examples above:

• Room proportion: 14.3%
• Time proportion: 23.8%
• Combined proportion: 14.3% × 23.8% = 3.4%

However, some expenses like broadband may be claimed at a higher rate if they're essential for work and wouldn't be needed otherwise. Apply the proportion that's reasonable for each expense type.

Worked Example: Actual Costs for a Spare Bedroom Office

Sarah is a director of her consultancy limited company. She works from a dedicated spare bedroom 40 hours per week.

Her Home Setup

• 4-bedroom house (6 rooms total, excluding bathroom)
• Spare bedroom used exclusively as office
• Works from home 5 days per week, 8 hours per day

Her Annual Household Bills

Calculating Her Claim

Room proportion: 1/6 = 16.7%

Time proportion: 40 hours ÷ 168 hours = 23.8%

Combined proportion: 16.7% × 23.8% = 4.0%

*Sarah claims 100% of broadband as it's essential for her work and she wouldn't have the same package for personal use.

Comparison with Flat Rate

Sarah benefits from an extra £357 tax-free income by using the actual costs method. Over 5 years, that's nearly £1,800 more in her pocket.

Company Paying You Rent: Is It Worth It?

Some directors consider having their company pay rent for use of their home office. This is technically possible but comes with complications.

How It Works

• The company pays you a market-rate rent for the office space
• You declare this as rental income on your Self Assessment
• You can offset property expenses against the rental income

The Problems

When It Might Work

Paying rent makes sense only if:

• You have a large, dedicated office space
• The rental income is significant (several thousand per year)
• You're comfortable with the CGT implications
• You want to extract profits without dividend tax

For most directors, the actual costs method is simpler and avoids creating taxable income.

Capital Gains Tax Implications of a Dedicated Office

One critical consideration when claiming home office expenses: Private Residence Relief (PRR) on Capital Gains Tax.

The Risk

When you sell your home, you normally pay no Capital Gains Tax due to PRR. However, if part of your home is used "exclusively" for business, HMRC may argue that portion doesn't qualify for PRR.

How to Protect Yourself

HMRC's Position

HMRC has stated that claiming the flat rate or a proportion of running costs does not automatically create a CGT liability. The issue arises when you claim a portion of your home is used "exclusively" for business—especially if you claim rent or a proportion of mortgage interest.

Safe approach: Claim running costs (utilities, broadband, council tax) but not rent or mortgage interest. Use your office for occasional personal activities. This approach maximises your claim whilst protecting PRR.

Equipment and Furniture: Separate from Room Costs

Office equipment and furniture are claimed differently from room running costs. These are capital items or direct business expenses, not "use of home" claims.

What the Company Can Buy Directly

Items Under £500

Equipment costing under £500 can be claimed as a direct expense in most cases. For items over £500, claim through capital allowances (Annual Investment Allowance covers the full cost in year one).

Mixed-Use Equipment

If you use equipment for both business and personal purposes (like a laptop you also use for personal browsing), technically only the business proportion is claimable. In practice, if equipment is primarily for business, most accountants treat it as 100% business.

Record Keeping Requirements

HMRC can enquire into your tax affairs up to 6 years after the relevant tax year. Keep thorough records to support your claims.

For Flat Rate Claims

Minimal records needed:

• Evidence you worked from home during the period claimed
• Company board minute or resolution approving the payment

For Actual Costs Claims

Keep the following for at least 6 years:

Digital Storage

HMRC accepts digital copies. Photograph or scan bills when they arrive and store them in a folder. This prevents faded thermal receipts and lost paperwork.

Flat Rate vs Actual Costs: Comparison Table

When Flat Rate Wins

• Annual household bills under £5,000
• Small home or shared workspace
• Working from home 1-2 days per week
• You hate paperwork

When Actual Costs Wins

• Annual household bills over £6,000
• Dedicated home office
• Working from home 4-5 days per week
• Higher energy costs (large home, electric heating)
• You're organised with record keeping

Common Mistakes to Avoid

1. Claiming Mortgage Interest

Many directors assume they can claim a proportion of mortgage interest. Whilst technically possible for sole traders, doing this through a limited company is complex and creates CGT exposure. Stick to running costs.

2. Overclaiming Broadband

Claiming 100% of broadband is acceptable if it's genuinely essential for work. But if you have a premium package primarily for streaming and gaming, claiming the full amount isn't defensible. Be realistic about business use.

3. Forgetting to Document the Arrangement

The company should formally approve the home office payment arrangement. A simple board minute stating "The company will reimburse the director for use of home as office at the rate of £X per month" is sufficient.

4. Inconsistent Claims

If you claim £50 per month one year and £150 the next without explanation, HMRC may question the variance. Keep your calculation methodology consistent and document any changes (like working more hours from home).

5. Not Claiming at All

Many directors simply forget to claim home office expenses. The flat rate takes 5 minutes to set up and delivers £312 per year tax-free. There's no reason not to claim something.

6. Confusing Personal and Company Claims

As a director, you're both an employee and a shareholder. The company pays you for home office use—this is different from claiming through Self Assessment. Make sure payments flow through the company accounts properly.

7. Double Claiming

You cannot claim through both your company and your personal Self Assessment for the same expenses. Choose one route and stick to it.

Frequently Asked Questions

Can I claim if I only work from home one day per week?

Yes, but the flat rate is almost certainly your best option. The actual costs method rarely produces meaningful amounts for occasional home working. Claim the £6 per week for any week you work from home.

What if I work from home but don't have a dedicated office?

You can still claim. Even if you work from the kitchen table, you're entitled to the flat rate. For actual costs, calculate a reasonable proportion based on the space you use and the time you spend working.

Can my company pay me more than the actual costs?

No. Payments above genuine costs would be treated as salary, subject to Income Tax and National Insurance. Keep payments at or below what you can justify with calculations.

Do I need to tell HMRC about home office payments?

The company claims the expense through its Corporation Tax return. You don't need to report tax-free home office payments on your personal Self Assessment. However, keep records in case of enquiry.

Can I claim if my company already pays for a co-working space?

Yes, if you genuinely work from home as well. Many directors use co-working spaces part-time and work from home the rest. Claim for the days you're actually at home.

What if I move house during the year?

Calculate proportions for each property based on the time you lived there. Your claim might be higher or lower depending on the new property's characteristics.

Can I backdate claims for previous years?

Yes. If you've been working from home but not claiming, you can reimburse yourself for previous years. Adjust company accounts and file amended returns if necessary. Claims can typically go back 4 years.

How do energy price increases affect my claim?

If you use the actual costs method, higher energy bills mean higher legitimate claims. The flat rate doesn't adjust, which is why actual costs often beats the flat rate when energy prices are high.

My spouse also works from home for their own company. Can we both claim?

If you share a home office, you need to split the claim. Each person can claim their proportion of the business use. You can't both claim 100% of the same costs.

What happens if HMRC challenges my claim?

If your calculations are reasonable and documented, you'll be fine. HMRC may ask to see your methodology and supporting bills. Keep records tidy and you'll have nothing to worry about.

How AccountsOS Helps

Tracking home office expenses shouldn't require spreadsheets and manual calculations. AccountsOS automates the entire process.

Automatic calculation: Set up your home office details once—room count, office size, working hours—and AccountsOS calculates your optimal claim method. It compares flat rate versus actual costs and recommends the approach that maximises your tax savings.

Bill tracking: Forward your utility bills to your AccountsOS email address. The AI extracts the amounts and applies your business proportion automatically. No data entry required.

Year-round visibility: See your accumulated home office claim at any time. Know exactly how much your company owes you before year-end.

HMRC-ready records: When your accountant asks for home office documentation, export a complete summary with all supporting calculations. Everything is stored securely for the required 6 years.

Comparison alerts: If energy prices change significantly, AccountsOS alerts you to recalculate. It ensures you're always using the method that puts the most money back in your pocket.

Stop leaving money on the table. See how AccountsOS works and start claiming every pound you're entitled to.