How to Start a Business in the UK: A Practical First-Month Checklist

Most guides to starting a business in the UK are either legal boilerplate or motivational fluff. This is the practical middle: the decisions that genuinely matter in month one, in the order they usually need making.

1. Sole trader or limited company?

This is the first real decision. Sole trader is simpler: register with HMRC, keep records, file a self-assessment. You and the business are legally the same thing, so you are personally liable for its debts. Limited company means registering with Companies House, separate accounts, and more admin — but the company is a separate legal person, which limits personal liability and can be more tax-efficient at higher profits.

The honest rule of thumb: start as a sole trader if you are testing an idea with modest income, and consider a limited company once profits are meaningful, you need liability protection, or clients expect it. Tax thresholds change, so confirm current rules on GOV.UK or with an accountant before deciding — this is one of the few places where an hour of paid advice repays itself.

2. Register at the right time

Register with HMRC as self-employed once you start trading; there are deadlines tied to the tax year, and late registration attracts penalties. Keep the registration confirmation somewhere you can find it — banks and clients ask.

3. Separate your money on day one

Even as a sole trader, where a business account is not legally required, open a separate account anyway. Mixing personal and business money is the single most common cause of a nightmarish first tax return. Every hour spent untangling one transaction stream is an hour you will resent.

4. Bookkeeping you will actually maintain

You need to know what came in, what went out, and what tax you owe. A spreadsheet works at very small scale, but software saves real time once invoices multiply — our QuickBooks for Self-Employed course covers setting this up without an accounting background. If you want to understand the numbers rather than just record them, Financial Accounting for Beginners is the right starting point.

Set a fixed weekly slot for this. Bookkeeping done weekly takes twenty minutes; done annually it takes a horrible weekend and produces worse decisions all year.

5. Insurance and legal basics

What you need depends on the work: public liability if the public visits or you visit them, professional indemnity for advice-based services, employers' liability the moment you employ anyone (this one is a legal requirement). If you handle personal data, you have data protection duties from your first customer, not from some later size threshold.

6. Price higher than feels comfortable

Under-pricing is the most common early mistake, and the hardest to reverse — raising prices on existing customers is far harder than starting higher. Work out your true costs including your own time, then set a price that leaves margin for the unpaid work nobody counts: admin, quoting, chasing invoices, the job that goes wrong.

Our Start Your Own Business in 7 Easy Steps course walks through pricing and planning together, and Financial Plan - The Fundamentals covers building the forecast a lender or investor will ask for.

Frequently asked questions

Do I need a business plan?

You need one if you are seeking funding. Otherwise a one-page version — who you serve, what you charge, how they find you, what it costs to deliver — is more useful than a thirty-page document nobody reads.

Can I start while employed?

Usually yes, but check your employment contract for exclusivity and intellectual property clauses, particularly if the business is in the same field.

When should I get an accountant?

Most people benefit from at least one paid consultation at the structure decision, then ongoing help once turnover or complexity grows.

This article is general information, not legal or tax advice — confirm current rules on GOV.UK or with a qualified accountant. Start learning with Start Your Own Business in 7 Easy Steps or browse Business courses.