Who Needs to File as Self-Employed?

You need to register for Self Assessment if you're self-employed as a sole trader and your business income exceeds £1,000 in a tax year (6 April to 5 April). This applies even if you have another job.

Income Threshold for Self-Assessment:

£1,000

Trading allowance - if you earn less than this, you don't need to register. Over £1,000, you must file.

Professions That Need Self Assessment

💻
IT Contractors

Outside IR35? Must file Self Assessment even through umbrella companies.

🏗️
Construction Workers

CIS subcontractors need to file to reclaim deductions and report income.

🚗
Delivery Drivers

Uber, Deliveroo, Just Eat - all platform economy workers must file.

🎨
Creative Freelancers

Designers, writers, photographers with project-based income.

👨‍⚕️
Healthcare Locums

Doctors, nurses, dentists with agency or locum work.

💼
Management Consultants

Independent consultants with multiple client engagements.

What Counts as Self-Employed Income?

Any money you earn from your trade, profession, or vocation counts as self-employed income. This includes:

  • Money from clients or customers
  • Payments from online platforms (Upwork, Fiverr, PeoplePerHour)
  • Income from selling goods or services
  • Commission-based earnings
  • Income from multiple small jobs or gigs
  • Part-time self-employment alongside employment

Expenses You Can Claim (Most Missed!)

Most self-employed people miss legitimate deductions. Here's what you can claim:

🏠 Home Office Costs
  • Simplified expenses: £6/week (no receipts needed)
  • Actual costs: Proportion of rent, mortgage interest, council tax
  • Heating, lighting, broadband (business portion)
  • Office furniture and equipment
🚗 Vehicle Expenses
  • Simplified: 45p/mile first 10,000 miles, then 25p/mile
  • Actual: Fuel, insurance, repairs, MOT, road tax
  • Parking and tolls for business trips
  • Hire charges for business vehicles
📱 Technology & Subscriptions
  • Mobile phone (business portion)
  • Software subscriptions (Adobe, Microsoft 365)
  • Website hosting and domain fees
  • Cloud storage and backup services
🎓 Professional Development
  • Training courses related to your business
  • Professional membership fees
  • Trade magazine subscriptions
  • Conference and seminar attendance
📧 Marketing & Business Costs
  • Business cards and stationery
  • Advertising costs (Google Ads, social media)
  • Website development and maintenance
  • Photography for business use
👔 Other Allowable Expenses
  • Bank charges on business accounts
  • Accountant's fees (including this service!)
  • Business insurance premiums
  • Client entertainment (limited rules apply)
📊 Real Example: How We Saved a Freelancer £2,340

Client: Sarah, freelance graphic designer, London

Income: £45,000 from design projects

Initial DIY Return: Claimed £5,200 in expenses, tax due: £7,890

Our Professional Review Found:

  • Missed home office deduction: £1,560 (actual costs method)
  • Unclaimed software subscriptions: £840
  • Business portion of mobile/internet: £720
  • Professional development courses: £1,200
  • Client meeting expenses: £420

Result: Total expenses increased to £9,940

Tax Saving: £2,340 reduction in tax bill

Net Cost of Our Service: £149 (saved £2,191 net)

Critical Deadlines & Penalties

5 October
Register for Self Assessment
Register with HMRC if you're newly self-employed. Miss this deadline and face an immediate £100 penalty.
31 January
Online Filing & Payment Deadline
Submit your tax return online and pay any tax owed. £100 immediate penalty + interest charges.
31 July
Second Payment on Account
If you make payments on account, your second payment is due. Late payments incur 5% penalties plus interest.

Penalty Structure for Late Filing

Days Late Penalty Additional Charges
1 day £100 Immediate penalty
3 months £10/day Up to £900 over 90 days
6 months 5% of tax due Or £300, whichever is greater
12 months Another 5% Additional 5% of tax due

Making Tax Digital (MTD) for Self-Employed

Starting April 2026: Self-employed with income over £50,000 must submit quarterly returns.

Current System: 1 annual Self Assessment return

MTD System: 4 quarterly returns + 1 final declaration = 5 submissions/year

Our MTD Service: £60 per quarter - we handle everything, no software subscriptions needed.