10 Expenses You’re Probably Missing on Your Self-Assessment

Filing your Self Assessment tax return? And, feeling overwhelmed? You are not alone.

Also, if you want to save money while filing, you just have to understand HMRC Self Assessment allowable expenses, and you can legally reduce your tax bill.

This blog explains the most common HMRC allowable expenses that can help you reduce your tax liabilities in the UK. It also breaks down exactly what you can claim and what you cannot to ensure compliance with UK tax regulations.

What are Allowable Expenses for Self-Assessment?

Before diving into the specific Self Assessment allowable expenses, let’s understand the meaning of allowable expenses. Allowable expenses are the costs that are incurred wholly and exclusively for trading purposes. These expenses can be deducted from business earnings before calculating tax liabilities. This helps to reduce the overall tax bill.

However, if an expense has a dual purpose, like both personal and business, you can only claim the expenses that relate directly to your work. To qualify as an allowable expense:

• The cost must be incurred wholly and exclusively for trading purposes.
• Some purchases that provide a lasting business benefit may not be claimed as regular business expenses but may qualify for capital allowances.
• You must keep accurate records, invoices, and receipts to support your claims.

Why Does Claiming Self-Assessment Allowable Expenses Matter?

Claiming all allowable business expenses reduces your taxable profit. This means you can pay less Income Tax. And, if you are self-employed, you can pay less Class 4 National Insurance.

When you ensure you are claiming the correct business costs, you avoid paying more tax than necessary. This leaves you more money to reinvest in your business or take home as income.

What are the 10 Self-Assessment Allowable Expenses?

UK small business owners can claim a surprising number of common business costs. Here’s a list of 10 business expenses you can claim when completing your Self Assessment tax return.

• Professional Subscriptions & Memberships

If you pay fees to an industry association or professional organisation, these costs are often tax-deductible. However, in most cases, the industry needs to appear on HMRC’s list of approved professional bodies.

Professional subscription and membership fees include trade union dues, regulatory fees, or industry magazine subscriptions.

• Office and Stationery Costs

Everyday office expenses are also included in Self Assessment allowable expenses and are fully deductible if they are used for business purposes. These expenses include pens, notebooks, printer paper, printer cartridges, and postage and courier costs. It is important to keep receipts and records because even small purchases can add up over the course of a tax year.

• Working From Home Costs

Running a small business from home? Well, you can claim a proportion of your household costs. Using a bedroom or other space as your office means your business is consuming home utilities, and it can qualify as Self Assessment allowable expenses.

If you are a remote worker, you can claim a reasonable business proportion of household costs, such as rent, utilities, council tax, and internet costs.

• Vehicle and Mileage Expenses

You can often claim mileage if you use your personal vehicle for business purposes. Use HMRC’s approved mileage rates to claim for vehicle and mileage expenses. This can be simpler for you than calculating actual vehicle running costs.

Additionally, keep a detailed mileage log that would show the date, purpose, and the distance of the travel. Remember, accurate records are important if HMRC requests evidence.

• Equipment & Technology

Equipment and technology are among the most commonly claimed Self Assessment allowable expenses. You may rely on technology to operate your business effectively. The good news is, you can claim these costs. Business-related equipment purchases, such as laptops, computers, printers, and specialist tools and equipment, are tax-deductible. You can generally claim the business-use portion of mobile phone and internet costs.

However, for larger purchases, you may need to claim through capital allowances rather than as day-to-day business expenses, depending on the circumstances.

• Travel Costs

Another one of the commonly claimed Self Assessment allowable expenses is business travel costs. You cannot claim for your regular daily commute, but incidental costs on business trips add up quickly.

To claim travel costs, the trip must be genuinely for business. If you are travelling to a permanent place of work, it is excluded. Travel costs include bridge tolls, train tickets, hotel stays, overnight subsistence meals, and parking fees (excluding fines).

• Training and Professional Development

Training and professional development costs can often be included among your Self Assessment allowable expenses. These costs may qualify if they help you improve existing skills needed for your current business.

For example, professional development programmes, industry-specific courses, workshops and seminars, and Business-related certifications are included in these expenses. However, a training course to enter a completely new trade may not qualify for business costs.

• Business Insurance

When you are self-employed as a freelancer or contractor, you do not receive employment benefits such as Statutory Sick Pay. Also, your income depends on your ability to work.

Disputes, accidents, or professional mistakes in a business can lead to costly claims or legal expenses. Insurance policies that protect your business are normally included in Self Assessment allowable expenses. Examples are professional indemnity insurance, public liability insurance, employers’ liability insurance, business equipment insurance, and cyber insurance.

• Marketing and Advertising

Marketing and advertising also qualify as self-assessment allowable expenses. Since promoting your business is a legitimate business expense, you can claim these costs. For instance, you can claim marketing costs like online advertising, Google Ads, social media advertising, printed brochures, domain registration, email marketing software, CRM subscriptions and much more.

• Telephone and Internet Expenses

In this fast-paced world, everything is done online, including communication. Businesses now rely on the internet, mobile phones and computers. Therefore, you can claim telephone and internet costs.

Using a broadband connection or a mobile phone for business qualifies for Self Assessment allowable expenses. Remember, if the expenses fall into both personal and business use, you can only claim the business costs.

What are the Expenses You Cannot Claim While Filing for Self-Assessment Tax Return?

The answer is simple: you cannot claim personal expenses. You are only allowed to claim costs that are incurred for business purposes. HMRC may investigate if you claim for personal items.

Therefore, you must ensure to exclude personal expenses, such as everyday clothing, client entertainment, fines and penalties, and travel costs between your home and your regular place of work. Furthermore, courses that help you launch a completely new business or switch careers entirely are also included in personal expenses.

How to Claim Self Assessment Allowable Expenses Through HMRC?

Include your business expenses on your Self Assessment tax return to claim allowable expenses. Do this when you are reporting your business income. Here are the steps to follow to claim tax deductible expenses for self-employed.

• Keep Detailed Records

Keep accurate records and maintain receipts, invoices, mileage logs, and bank statements. These records act as evidence when HMRC asks you to support your claim. HMRC generally requires records to be retained for at least 5 years after the 31 January submission deadline.

• Total Your Expenses by Category

Calculating the total for each expense category at the end of the tax year is one of the crucial parts of claiming self assessment allowable expenses. If an expense includes both business and personal use, you should claim only the business portion.

• Complete Your Self Assessment Tax Return

Enter your expense totals on your Self Assessment tax return. If you are filing online, HMRC’s system will guide you. Moreover, you do not need to submit receipts with your return. However,  you must keep them for your records.

• Check Your Figures Carefully

Review income and expenses figures carefully before submitting your return. Submit accurate tax returns to avoid errors that can result in delays, amendments, or HMRC enquiries. If you are unsure about your expenses, seek professional advice or consult HMRC guidance.

• Submit Your Return

The last step to claim Self Assessment allowable expenses is to submit your returns. For online filing, the deadline is 31 January following the end of the tax year. You must pay your tax by this date. Missing the deadline can result in penalties.

What Are the Common Mistakes When Claiming Expenses?

Here are the common mistakes most taxpayers make while claiming business expenses. For instance, they don’t keep accurate records and receipts and forget to record small expenses throughout the year.

Additionally, they mix personal and business expenses, which creates confusion when claiming. Poor bookkeeping practices can prevent you from claiming business expenses you are entitled to.

You must ensure that you maintain records and avoid claiming non-allowable expenses. Also, don’t leave expense tracking until the last minute. This can create a budget overrun, or you may miss tax deductions.

The Bottom Line

You can reduce your tax liabilities by claiming Self Assessment allowable expenses. Keep more of your income by claiming business expenses like travel costs, professional fees, business insurance, marketing expenses, and much more.

However, you need to keep accurate records, review your expenses regularly, and understand HMRC’s rules to claim legitimate expenses. If you are confused about your business costs, the best thing to do is to seek professional advice. Accountants or tax experts can help you maximise your tax relief while staying fully compliant with UK tax regulations.

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