What is Depreciation? Full Guide for Business Owners

Quick answer: Depreciation is an accounting method that spreads the cost of a business asset — like a computer, van, or machinery — across its useful life, rather than expensing it all at once. In the UK, HMRC does not accept depreciation as a tax deduction. Instead, you claim tax relief through capital allowances.

Key Takeaways

• Depreciation is not tax-deductible in the UK. HMRC uses capital allowances instead, and many business owners don't know this until they file their first Corporation Tax return.
• The two most common depreciation methods in the UK are straight-line and reducing balance.
• A depreciation schedule maps out how much value your asset loses each year — and it directly affects your balance sheet.
• Accumulated depreciation is a contra-asset account. It is not an asset. It reduces the carrying value of your fixed assets on the balance sheet.
• Car depreciation is one of the costliest, and least talked-about, financial hits a business can take. According to the AA Car Depreciation Guide, a new car can lose around 40% of its value in the first year alone.
• Getting depreciation right isn't just good accounting, it's good tax planning.

Here's something most business owners only discover when it's too late: the way you record asset costs in your accounts and the way HMRC calculates your tax relief are two entirely different things.

For example, you buy a £5,000 laptop. You think you can write it off as an expense. Your accountant tells you it needs to be "depreciated." Then someone else mentions "capital allowances." And suddenly, a straightforward purchase has turned into a maze of accounting rules and HMRC guidance.

This guide cuts through all of that. Whether you're filing your first Corporation Tax return or you've been running a business for years and want to make sure you're doing this right, this is the only resource you'll need.

We'll cover what depreciation actually means, how to calculate it, what a depreciation schedule is, UK depreciation rates for fixed assets, the crucial difference between depreciation and capital allowances, car depreciation, and more, all in plain English.

What is Depreciation in Simple Terms?

Depreciation is the gradual reduction in the value of a business asset over time.

Every piece of equipment, every vehicle, every computer your business buys will eventually wear out, become outdated, or need replacing. Depreciation is simply the accounting method used to reflect that reality. Instead of recording the entire cost of an asset as an expense in the year you buy it, you spread that cost across the number of years you expect to use it.

So what does depreciate mean in practice? If you buy a van for £20,000 and expect to use it for five years, you'd record a portion of that £20,000 as a cost each year. That annual figure is your depreciation charge.

This matters because it gives you a more accurate picture of your actual business costs. Without depreciation, your accounts would show a huge expense in the year you buy the asset and nothing in subsequent years, even though you're still benefiting from and using it.

What is Depreciation in Accounting?

In accounting, depreciation is a non-cash expense recorded on your profit and loss (P&L) account each year. It reduces your reported profit, which in turn gives a truer view of your business performance.

Here's where it appears in your financial statements:

• Profit and loss account: The annual depreciation charge appears here as an operating expense, reducing your net profit for the year.
• Balance sheet: The asset is listed at its original cost. Each year, accumulated depreciation is subtracted from that cost to show the asset's current book value (also called net book value or carrying value).

It's important to understand that depreciation does not involve any actual outflow of cash. You've already paid for the asset. Depreciation is simply the accounting recognition that the asset is being consumed over time.

What Best Defines Depreciation?

The clearest definition of depreciation is this: the systematic allocation of the cost of a tangible fixed asset over its useful life.

The key word there is "systematic." Depreciation is not a random adjustment — it follows a structured method, applied consistently from year to year. It's governed by UK accounting standards (including Financial Reporting Council FRS 102 and FRS 105 for small businesses), and it requires four key inputs:

• Cost of the asset — what you paid for it, including delivery and installation
• Useful life — how long you expect to use it in your business
• Residual (scrap) value — the estimated value at the end of its useful life
• Depreciation method — how you spread the cost (straight-line or reducing balance, typically)

What is an Example of Depreciation?

Let's use a practical UK example to bring this to life.

Scenario: Your business purchases a delivery van for £20,000. You expect it to last 4 years, after which you'll sell it for a residual (scrap) value of £2,000.

Using the straight-line method:

• Depreciable amount: £20,000 − £2,000 = £18,000
• Annual depreciation charge: £18,000 ÷ 4 = £4,500 per year

By the end of Year 4, the van's book value equals its residual (scrap) value of £2,000. The full depreciable cost has been recognised as an expense in your accounts.

How to Calculate Depreciation

There are two main depreciation methods used by UK businesses.

Method 1: Straight-Line Depreciation

This is the simplest and most widely used method. It spreads the cost of an asset evenly across its useful life.

Formula:

Annual depreciation = (Cost − Residual value) ÷ Useful life (years)

Example: A computer costs £1,200, has a useful life of 3 years, and a residual value of £0.

Annual depreciation = (£1,200 − £0) ÷ 3 = £400 per year

Straight-line depreciation is best for assets that lose value steadily — office furniture, fixtures, and fittings, for example.

Method 2: Reducing Balance Depreciation

This method applies a fixed percentage to the remaining book value of the asset each year. It front-loads the depreciation, meaning you claim more in the early years when the asset is newest and most productive.

Formula:

Annual depreciation = Book value at start of year × Depreciation rate (%)

Example: A company purchases a computer for £1,000 and depreciates it at 20% reducing balance.

Reducing balance depreciation works well for vehicles, IT equipment, and technology — assets that tend to lose a larger proportion of their value in the first few years.

Which method should you choose? Straight-line is simpler and preferred for most office assets. Reducing balance better reflects the economic reality of high-depreciation assets like cars and computers. Either way, you should apply the same method consistently for each asset type.

What is a Depreciation Schedule?

A depreciation schedule is a table or record that maps out exactly how much an asset depreciates each year over its useful life.

It typically shows:

• The asset name and description
• Purchase date and original cost
• Residual (scrap) value
• Useful life
• Depreciation method
• Annual depreciation charge
• Accumulated depreciation to date
• Current book value (net book value)

Your depreciation schedule forms part of your fixed asset register — a complete record of all the capital assets your business owns. HMRC may request this in the event of an enquiry, so keeping it accurate and up to date is essential.

In practice, we at Debitam automate your depreciation schedule once you enter the asset details.

Is Depreciation an Expense?

Yes and no. It depends on what you mean by "expense."

In accounting terms: Depreciation is recorded as an expense on your profit and loss account each year. It reduces your reported profit. However, it is a non-cash expense, meaning no money actually leaves your business when you record it. You've already paid for the asset upfront.

For tax purposes in the UK: Depreciation is not. HMRC does not allow you to reduce your Corporation Tax bill using your accounting depreciation figures. Instead, they use a parallel system called capital allowances, more on that below.

This distinction catches a lot of business owners off guard. Your accountant will prepare two sets of profit calculations at year-end: one for your statutory accounts (which includes depreciation) and one for your Corporation Tax return (which replaces depreciation with capital allowances). These figures are often different.

UK Depreciation Rates for Fixed Assets

There are no hard and fast rules in UK accounting law about how quickly you must depreciate an asset; it's based on your professional judgement of the asset's useful life.

However, widely accepted UK depreciation rates for common fixed asset categories are:

Computer equipment depreciation rate: IT assets like laptops, servers, and monitors are typically depreciated at 33% straight-line (over 3 years) or 25–33% reducing balance, reflecting how quickly technology becomes outdated.

These are accounting depreciation rates, not HMRC capital allowance rates. The two systems run in parallel and produce different numbers. Always work with your accountant to ensure both are handled correctly.

Depreciation vs. Capital Allowances: What Does HMRC Actually Recognise?

This is arguably the most important section for any UK business owner.

Short Answer: HMRC does not allow you to deduct depreciation from your taxable profits. Full stop. Instead, you claim capital allowances on your Corporation Tax return — and these are governed by HMRC's own rules, not your accounting policies.

Here's how the main capital allowance rates work for 2025/26:

What this means in practice: If you buy a £10,000 piece of machinery and it qualifies for the Annual Investment Allowance, you can deduct the full £10,000 from your taxable profits in the year of purchase — regardless of how your accountant depreciates it over 5 years in your statutory accounts.

This is why your accounting profit and your taxable profit will rarely be the same number. Your accountant adjusts for the difference when preparing your CT600 (Corporation Tax return).

What Is Car Depreciation and How Do You Avoid It?

Car depreciation is the rate at which a vehicle loses its market value over time. And the numbers are sobering.

According to the AA, a new car can lose around 40% of its value in the first year of ownership. By the end of year three (at approximately 10,000 miles per year), the average car will have lost around 60% of its original value.

That means a company car purchased for £30,000 could be worth just £12,000 three years later, a depreciation cost of roughly £6,000 per year.

For business owners, car depreciation matters in two ways:

1. In your accounts: Business vehicles are fixed assets that must be depreciated, typically at 25% reducing balance.
2. For HMRC: Capital allowances on cars depend on CO₂ emissions. Low-emission and electric vehicles attract more generous relief than high-emission cars, which fall into the special rate pool at just 6% WDA. Check Capital Allowances on Cars 2026 guide to see more on EV`s future this year.

How to minimise car depreciation losses

• Buy nearly new rather than brand new — let someone else absorb the steepest first-year drop
• Choose models with strong residual values — fuel-efficient and electric vehicles tend to hold their value better
• Keep mileage low and maintain the vehicle well — condition and service history directly affect resale value
• Consider leasing — this transfers depreciation risk to the leasing company, and monthly payments may be more tax-efficient depending on CO₂ emissions

Is Accumulated Depreciation an Asset?

No, but this is one of the most commonly misunderstood points in small business accounting.

Accumulated depreciation is the total amount of depreciation charged against an asset since it was purchased. It sits on the balance sheet as a contra-asset — meaning it has a credit balance, which is the opposite of a normal asset (which has a debit balance).

Accumulated depreciation reduces the carrying value of your assets. It tells anyone reading your accounts how much of an asset's original cost has been written off so far.

It is not an asset you can sell. It doesn't represent cash you can use. It's simply a running total of the economic value your assets have consumed — and keeping it accurate is essential for honest, compliant accounts.

TL;DR | What is Depreciation?

• Depreciation spreads the cost of a business asset across its useful life
• It appears as a non-cash expense on your P&L and reduces the book value of assets on your balance sheet
• HMRC does not accept depreciation for tax purposes — use capital allowances instead
• Two main methods: straight-line (even annual charges) and reducing balance (higher charges in early years)
• A depreciation schedule tracks annual charges, accumulated depreciation, and book value for each asset
• UK depreciation rates vary by asset type — computers typically 3 years, vehicles 4 years, plant and machinery 5–7 years
• Accumulated depreciation is a contra-asset — it reduces the gross value of your assets, it is not an asset itself
• Car depreciation is significant — new cars can lose ~40% of their value in year one (AA)
• Capital allowances (AIA, WDA, Full Expensing) are what actually reduce your Corporation Tax bill

Get Your Depreciation Right With Debitam

It is absolutely paramount you get depreciation right before filing a corporation tax return (CT600) because depreciation is one of those areas where small errors compound over time. Misclassify an asset. With our years of experience in company filings, this is an everyday task for our team at Debitam.

Use the wrong method. Miss a capital allowance claim. Before you know it, your accounts don't reflect the true position of your business — and your Corporation Tax bill is higher than it should be.

That's where Debitam comes in. Rated 4.8/5 on Trustpilot, trusted by +26,000 businesses across the UK for over 8 years from over 6,000 reviews, Debitam's team of dedicated accountants handles everything from fixed asset registers and depreciation schedules to full Corporation Tax returns, accurately, on time, and with no hidden fees.

Whether you're setting up your first limited company or you've been trading for years and want to make sure you're not leaving money on the table, get in touch with Debitam today and speak to a dedicated accountant who knows UK tax inside and out.

Frequently Asked Questions on Depreciation

What is the definition of depreciation in business?

Depreciation in business is the accounting process of spreading the cost of a tangible fixed asset over its expected useful life. It reflects the gradual reduction in the value of an asset through wear, use, and obsolescence, and appears as a non-cash expense in a company's profit and loss account each year.

What is the difference between depreciation and amortisation?

Depreciation applies to tangible (physical) assets such as equipment, vehicles, and buildings. Amortisation is the equivalent process for intangible assets — things like patents, trademarks, and software licences. Both spread the cost of an asset over its useful life, but they apply to different types of assets.

Can I deduct depreciation from my Corporation Tax in the UK?

No. HMRC does not allow depreciation as a tax-deductible expense. Instead, you claim capital allowances on your Corporation Tax return. The Annual Investment Allowance (AIA) allows most small businesses to deduct the full cost of qualifying plant and machinery — up to £1 million per year — in the year of purchase.

What is the depreciation rate for computer equipment in the UK?

Computer equipment is typically depreciated at 33% straight-line (written off over 3 years) or 25–33% reducing balance in UK company accounts. For tax purposes, IT equipment usually qualifies for the Annual Investment Allowance (AIA), which gives 100% relief in the year of purchase.

What is scrap value (residual value) in depreciation?

Scrap value — also called residual or salvage value — is the estimated amount an asset will be worth at the end of its useful life. You subtract scrap value from the original cost before calculating depreciation. For example, if a van costs £20,000 and its scrap value is £2,000, only £18,000 is depreciated across its useful life.

What is a depreciation charge?

A depreciation charge is the annual amount of depreciation recorded as an expense in your profit and loss account. It represents the portion of an asset's cost that has been "used up" in that financial year.

Is accumulated depreciation a current asset or a fixed asset?

Neither. Accumulated depreciation is a contra-asset — it sits on the balance sheet as a deduction from the gross value of your fixed assets. It carries a credit balance (unlike normal assets which carry a debit balance), and its purpose is to show the net book value of your assets after accounting for how much value has been written off over time.

How often should I review my depreciation schedule?

You should review your depreciation schedule at least annually, when preparing your year-end accounts. If an asset's useful life changes — for example, you plan to replace equipment sooner than expected — you should update your estimates accordingly. HMRC may request your fixed asset register during a tax enquiry, so keeping it accurate is important.