Mixed-Use Property Relief: Reclaiming VAT on Part-Business Premises

What Is Mixed-Use VAT Recovery?

If you're VAT-registered and work from home, you may incur VAT on costs like utilities, broadband, repairs, and even certain building works. The good news is that HMRC allows you to reclaim the business proportion of the VAT on these costs — but only if you get your apportionment method right and keep solid records.

This is known as mixed-use VAT recovery, and it applies where a single expense or asset is used for both taxable business purposes and private purposes. Getting it wrong can lead to penalties, so it pays to understand the rules before submitting your VAT return.

Who Does This Apply To?

Mixed-use VAT recovery is most relevant to sole traders and freelancers who are VAT-registered and use their home as their principal place of business. Examples include consultants, designers, writers, therapists, and tradespeople who store equipment or stock at home. Limited company directors who work from home are generally in a different position, as the company and the home are legally separate — we'll cover that in a separate guide.

Which Costs Can You Apportion?

You can potentially reclaim a business proportion of VAT on:

• Broadband and telephone bills (if on a single combined contract)
• Utility bills (electricity, gas, water) where the supplier is VAT-registered and charges VAT
• Repairs and maintenance to the property
• Cleaning costs
• Building works that enhance the business area of the property

Note: Domestic energy is subject to the reduced 5% VAT rate, not 20%, so the recoverable amount is smaller. Mortgage interest and council tax carry no VAT at all, so there is nothing to reclaim on those costs.

How to Calculate Your Business Proportion

HMRC does not prescribe a single method, but your apportionment must be fair and reasonable. The most commonly accepted approaches are:

• Floor area method: Divide the area used exclusively or predominantly for business by the total floor area of the property. For example, if your dedicated office is 15 square metres in a 100 square metre home, your business proportion is 15%.
• Room count method: Count the number of rooms used for business versus total rooms. This is simpler but less precise.
• Time-and-space method: Useful when a room is shared — multiply the proportion of space by the proportion of time it is used for business.

Once you have your percentage, apply it to the VAT element of each qualifying invoice. Only record the business portion on your VAT return in Box 4 (VAT reclaimed).

What Records Does HMRC Require?

You must be able to demonstrate your apportionment methodology if HMRC enquires. Keep the following:

• A written note of your chosen method and how you calculated the percentage
• Floor plans or room measurements if using the area method
• Original VAT invoices for all costs you are apportioning
• A log showing how and when business areas are used, if applying a time element

HMRC can challenge claims it considers inflated or poorly evidenced, so consistency across VAT periods matters.

Common Mistakes to Avoid

Many sole traders overclaim by applying a business percentage to costs that have no VAT to recover, or by including rooms that are only occasionally used for work. Equally, some underclaim because they assume home costs are entirely private. Both errors create problems — one risks penalties, the other leaves money on the table.

Also be aware that if you make exempt supplies as well as taxable ones (for example, certain financial or educational services), your recovery may be subject to partial exemption rules, which add another layer of calculation.

Next Steps

Review your current VAT returns to check whether you are already claiming — and whether your method is documented. If you have never claimed a business proportion on home costs, consider whether backdating is possible: HMRC generally allows claims up to four years after the relevant VAT period. Speak to a VAT adviser if your situation involves exempt supplies or significant building works.