What Are Capital Allowances?
Capital allowances let you deduct some or all of the value of an item from your profits before you pay tax [1]. If you buy a laptop for your agency, you do not deduct the full cost as an expense in your profit and loss account. Instead, you claim capital allowances on it. The effect is the same: your taxable profit goes down, and your corporation tax bill goes down with it.
For agency founders, this matters because you spend real money on equipment. Laptops, monitors, desks, chairs, servers, software licences (the perpetual kind), office fit-out, even the air conditioning in your studio. All of these can qualify.
This article walks through a worked example for a typical UK agency. We will use a 12-person digital agency based in Manchester Northern Quarter, turning over £800k per year. You can map the numbers onto your own situation.
The Core Allowances Available
Before the example, here are the main types of capital allowance you need to know.
Annual Investment Allowance (AIA)
You can claim up to £1 million on certain plant and machinery under the annual investment allowance [1]. This is the most generous relief available to most agencies. It gives you 100% tax relief in the year you buy the asset. Spend £20,000 on laptops, and you deduct £20,000 from your profits in the same accounting period. The £1m AIA is available until 31 March 2026 [2].
Writing-Down Allowances
If your total qualifying spend exceeds £1m in a single year, or if you buy assets that do not qualify for AIA, you claim writing-down allowances instead. The main rate pool for plant and machinery has a writing-down allowance of 18% per annum on a reducing balance basis [2]. The special rate pool for long-life assets and integral features has a writing-down allowance of 6% per annum on a reducing balance basis [2].
Most agency equipment falls into the main rate pool. Integral features like electrical systems, air conditioning, and lifts fall into the special rate pool.
Full Expensing
Full expensing and 50% first-year allowance can be claimed on qualifying plant and machinery investments from 1 April 2023 [1]. This is effectively a permanent replacement for the old super-deduction. It gives companies 100% relief on qualifying main rate assets and 50% relief on special rate assets. Unlike AIA, there is no cap. But it is only available to companies, not sole traders or partnerships.
The Worked Example: A Digital Agency's Capital Allowances Claim
Let us run through a realistic scenario. Agency Alpha Ltd is a digital agency in Manchester. In the year ending 31 March 2026, the founder buys the following assets:
- 10 new laptops for the team: £15,000 total
- Office furniture (desks, chairs, meeting table): £8,000
- Two high-spec Mac Pros for video editing: £12,000
- New server and network equipment: £5,000
- Air conditioning unit for the studio: £4,500
- Office refurbishment (new lighting, electrics, partitioning): £18,000
Total spend: £62,500. The question is: how much tax relief does the founder get, and in which year?
Step 1: Classify Each Asset
First, we split the assets into the correct pools.
Main rate pool (qualifies for AIA or full expensing):
- Laptops: £15,000
- Office furniture: £8,000
- Mac Pros: £12,000
- Server and network: £5,000
- Total: £40,000
Special rate pool (integral features):
- Air conditioning: £4,500
- Office refurbishment (lighting, electrics, partitioning): £18,000
- Total: £22,500
Total qualifying expenditure: £62,500. This is well within the £1m AIA limit, so the founder can claim 100% relief on everything in the year of purchase.
Step 2: Apply the AIA
The founder claims AIA on the full £62,500. This reduces taxable profits by £62,500 in the year ending 31 March 2026.
If the agency's corporation tax rate is 19% (small profits rate, profits under £50k), the tax saving is £11,875. If the agency pays 25% (main rate, profits over £250k), the saving is £15,625.
That is a real cash saving. The founder effectively gets the government to fund a quarter of the equipment cost.
Step 3: What If Spend Exceeds £1m?
Suppose the same agency spent £1.2m on a full office fit-out and new equipment. The AIA covers the first £1m. The remaining £200,000 would go into the main rate pool and attract writing-down allowances at 18% in year one (£36,000), then 18% of the reducing balance in year two, and so on. Alternatively, if the agency is a company, full expensing could apply to the main rate portion with no cap, giving 100% relief on that element too.
What Qualifies as Plant and Machinery for an Agency?
HMRC defines plant and machinery broadly. For agency founders, the following items typically qualify:
- Computers, laptops, tablets, monitors
- Servers, network switches, cabling
- Office furniture and storage
- Air conditioning, heating systems, ventilation
- Lighting installations (if part of a refurbishment)
- Kitchen and break-room equipment (fridges, kettles, microwaves)
- Telephone systems and handsets
- Tools of the trade: cameras, recording equipment, design hardware
What does not qualify? Land, buildings (the structure itself), and items used purely for residential purposes. If you let out residential property, you can only claim for items to be used in a residential building if the building has multiple residential units, like a block of flats, and it is to be used in a communal part of the building [1]. That is unlikely to apply to most agencies.
Structures and Buildings Allowance
If you buy a freehold office or spend money on a new building, you cannot claim capital allowances on the building itself. But you can claim the structures and buildings allowance (SBA). The SBA allows a deduction from profits at an annual rate of 3% in 2020/21 (previously 2%) calculated on the expenditure [3]. This applies to non-residential structures and buildings where expenditure was incurred on or after 29 October 2018 [3].
For a Manchester agency buying a freehold office for £400,000, the SBA gives £12,000 per year in tax deductions for 33 years. It is not as generous as AIA, but it is still real relief on a large capital outlay.
Common Mistakes Agency Founders Make
I see three recurring errors when reviewing capital allowances claims for agency clients.
1. Treating everything as a revenue expense. Some founders put laptops and furniture through the profit and loss as general expenses. That is technically incorrect. HMRC expects capital items to be capitalised and claimed through allowances. In practice, many small agencies get away with it, but if HMRC opens a compliance check, they will adjust the return and possibly charge penalties.
2. Missing the AIA cap. The £1m AIA is generous, but it is not permanent. It has changed several times in the last decade. Always check the current limit before filing. As of 2025/26, it is £1m until 31 March 2026 [2].
3. Forgetting the special rate pool. Integral features like air conditioning and electrical systems go into the special rate pool at 6% writing-down allowance, not the main pool at 18%. If you lump them together, you overclaim relief in year one and HMRC will adjust it later.
How to Claim Capital Allowances
You claim capital allowances in your company tax return (CT600) or self-assessment return (SA100 for sole traders). The calculation goes into the capital allowances computation, which is part of the tax computation that supports the return.
Most accounting software does not handle capital allowances automatically. Xero and QuickBooks will capitalise the asset and post depreciation, but the tax treatment is different. Your accountant will adjust for this in the year-end tax computation.
If you use a sole trader or partnership and you use cash basis, you can only claim capital allowances on business cars [4]. Everything else is expensed as you pay for it. That is simpler but less generous in some cases.
When to Speak to Your Accountant
If you have spent more than £10,000 on equipment in the last 12 months, ask your accountant before year-end. The timing matters. You claim allowances in the period you incur the expenditure, not when you pay the invoice. If you ordered laptops in March but paid in April, the allowance belongs to the March year-end.
Our ICAEW qualified team at Agency Founder Finance handles capital allowances computations for agency founders across the UK. If you want to check whether your recent purchases qualify, get in touch. We work with marketing agencies, digital agencies, and creative agencies specifically.
Capital allowances are one of the most straightforward ways to reduce your corporation tax bill. The example above shows how a £62,500 spend can save between £11,875 and £15,625 in tax. That is real cash in your pocket, not deferred relief. Use it.
Sources
- gov.uk: Claim capital allowances: Overview - GOV.UK
- icaew.com: Capital allowances | Tax - ICAEW.com
- accaglobal.com: Maximising capital allowances relief - ACCA Global
- aka.hmrc.gov.uk: Claim capital allowances: Overview - GOV.UK