Start a Business in the UK (2026 Guide)

Why This Guide Exists

Starting a business in the UK is simpler than most people think — but only if you follow the right steps from day one.

At Brightson Accounting in Wolverhampton, we've helped hundreds of entrepreneurs across the West Midlands set up correctly, avoid costly mistakes, and stay compliant with HMRC.

This guide brings together everything you need to know — from choosing your business structure to registering with HMRC, understanding tax, and avoiding common pitfalls.

Complete Business Startup Guides

We've created in-depth guides covering every aspect of starting a business in the UK. Start with the overview, then dive into the specific topics that matter to you.

Choosing Your Business Structure

The first major decision you'll make is whether to operate as a sole trader or limited company.

Both structures have pros and cons — and the right choice depends on your profit level, risk tolerance, and growth plans.

Sole Trader:

• Simple and low cost
• Easy to set up (register with HMRC for free)
• You keep all profits (after tax)
• Best for profits under £30,000/year

Limited Company:

• More tax-efficient for higher profits (£30,000+)
• Limited liability protection
• More professional image
• More admin and compliance required

Full comparison: Sole Trader vs Limited Company (UK 2026)

Registering Your Business

Once you've chosen your structure, you need to register with HMRC (and Companies House if you're forming a limited company).

Sole Traders:

• Register for Self Assessment by 5 October following your first tax year
• Registration is free and takes 10 minutes online
• You'll receive a Unique Taxpayer Reference (UTR)

Full guide: How to Register as Self-Employed in the UK

Limited Companies:

• Register with Companies House (£12 online)
• Register for Corporation Tax with HMRC (within 3 months)
• Set up PAYE if you're paying yourself a salary

Understanding Tax

Tax is one of the biggest concerns for new business owners — and understanding it early will help you plan ahead and avoid surprises.

Sole Traders Pay:

• Income Tax (20% on profits between £12,570–£50,270)
• Class 2 National Insurance (£3.45/week)
• Class 4 National Insurance (9% on profits)

Limited Companies Pay:

• Corporation Tax (19% on profits up to £50,000)
• Directors pay Income Tax and NI on salary and dividends

Full breakdown: How Much Tax Will I Pay as a New Business Owner?

Financial Setup

Getting your financial systems right from day one will save you time, stress, and money.

Business Bank Account:

Even if you're a sole trader, we strongly recommend opening a business bank account.

Benefits:

• Easier bookkeeping
• Professional image
• Required for MTD compliance
• Prevents mixing personal and business finances

Full guide: Business Bank Account: Do You Really Need One?

Startup Costs You Can Claim:

Many pre-trading expenses are tax-deductible — including equipment, software, marketing, and professional fees.

Full guide: Business Startup Costs You Can Claim

Avoiding Mistakes

Most new business owners make the same mistakes — and most of them are completely avoidable.

Common errors include:

• Mixing personal and business finances
• Not keeping receipts
• Missing HMRC deadlines
• Underestimating tax liabilities
• Choosing the wrong business structure

Full guide: Common Mistakes New Business Owners Make

Starting a Business in Wolverhampton & the West Midlands

Wolverhampton has a thriving small business community — from trades and construction to creative agencies, consultants, and e-commerce.

At Brightson Accounting, we specialise in helping local entrepreneurs:

• Choose the right business structure
• Register correctly with HMRC and Companies House
• Set up accounting and tax systems
• Claim all allowable expenses
• Stay compliant and avoid penalties

We offer fixed-price startup packages and free initial consultations.

Many small businesses we work with across Birmingham, Wolverhampton, Coventry, and Leicester benefit from having an accountant in Wolverhampton who understands local business challenges and HMRC compliance.