You can usually start trading right away. First, choose your structure, then register with HMRC if you’re a sole trader or Companies House if you’re forming a limited company. This week, prioritise two things: confirming your structure and separating your finances with a dedicated bank account or bookkeeping system. Expect HMRC and Companies House to be the two bodies you deal with most in your first month.

Table of Contents

• How do I choose a business structure in the UK?
• Registering with HMRC and Companies House: steps, fees, and timing
• Getting your business finances right from day one
• Do I need a licence to trade in the UK?
• What are my duties if I employ staff?
• Your 30-day checklist to launch legally
• A solicitor’s view on where new businesses go wrong
• Which advisor should you hire first?
• Get your incorporation and compliance right the first time
• Sources

How do I choose a business structure in the UK?

Most people register as a sole trader or a limited company, and the choice shapes your tax bill, your paperwork, and how exposed your personal assets are if things go wrong.

A sole trader is the simplest route. You keep all profits after tax, but you’re personally liable for business debts, and there’s no legal separation between you and the business. A limited company is its own legal entity, which protects your personal assets, but brings more filing obligations. A partnership splits liability and profit between two or more people under a shared agreement, while a limited liability partnership (LLP) gives partners the liability protection of a company while keeping the flexibility of a partnership structure, often used by professional firms.

• Sole trader: minimal admin, full personal liability, simple tax via Self Assessment.
• Limited company: liability protection, more credibility with B2B clients and investors, but Corporation Tax, annual accounts, and a confirmation statement.
• Partnership: shared control and profit, shared liability unless structured as an LLP.
• LLP: liability protection plus partnership flexibility, common for solicitors, accountants, and consultancies.

Incorporation tends to make sense once profits grow, you want to bring in investors, or clients expect the credibility of a registered company. One thing that catches people out: since 18 November 2025, Companies House requires identity verification for all directors and people with significant control (PSCs). Skip this step and your filing gets rejected.

Registering with HMRC and Companies House: steps, fees, and timing

The registration path depends entirely on which structure you picked, and the deadlines aren’t flexible.

1. Sole traders must register for Self Assessment with HMRC once income passes £1,000 in a tax year. There’s no Companies House registration at all. Miss the October 5 deadline (for the tax year just ended) and you risk a penalty.
2. Limited companies need a company name, registered office address, at least one director, and a memorandum and articles of association. Companies House charges £100 for online applications and £124 by post, with online incorporation typically completing within 24 hours. Postal applications take considerably longer and give you less visibility on progress.
3. Once incorporated, you must register for Corporation Tax within three months of starting to trade.
4. If you’re hiring, register for PAYE before your first payday. If your taxable turnover crosses the VAT threshold, you must register for VAT, though you can register voluntarily below that point too.

Registering online is faster and gives you a digital paper trail. Going through an agent, such as a solicitor or accountant, costs more but catches errors before Companies House does, which matters given how often flawed PSC records now cause rejected filings.

Getting your business finances right from day one

Mixing personal and business money is the fastest way to create a compliance headache later, and it makes bookkeeping far harder than it needs to be. For limited companies, opening a dedicated business bank account isn’t optional in practice, since most banks require it once you’ve incorporated.

• Keep clean records of income, expenses, invoices, and receipts. HMRC expects these to be retrievable for at least five years for most business records.
• Register for VAT once you cross the threshold, or earlier if you want to reclaim VAT on setup costs and equipment.
• Sole traders can use a personal account technically, but a separate one saves enormous time at tax return season.

Pro Tip: Gather your certificate of incorporation and verified director IDs before you approach a bank. Most business account delays happen because the paperwork wasn’t ready, not because the bank was slow.

Do I need a licence to trade in the UK?

Not every business needs a licence, but plenty do, and finding out late is expensive. Food businesses, transport operators, care providers, and financial services firms are among the sectors most commonly caught by licensing rules.

• Use GOV.UK’s licence finder to check what applies to your specific activity and local authority area, and visit Landlord Compliance for guidance on licences and ongoing statutory duties in the sector.
• Apply early. Some licences, particularly for premises or vehicles, take several weeks to process.
• Get professional advice before trading if your sector is regulated. Fines for trading without the right permission usually outweigh the cost of checking first.

What are my duties if I employ staff?

Hiring changes your legal obligations immediately, even for one part time employee.

• Register for PAYE with HMRC before your first payday, ideally with a couple of weeks’ lead time to avoid processing delays.
• You’ll pay employer National Insurance contributions above certain earnings thresholds, and most staff must be automatically enrolled into a workplace pension.
• Carry out right-to-work checks on every new hire and put a written contract in place, even a short one, before their first day.

Your 30-day checklist to launch legally

Spreading the work across a month keeps each stage manageable and stops small mistakes compounding into rejected filings or missed deadlines.

1. Days 1–7: pick your structure, check your chosen name isn’t taken, run a licence check via GOV.UK, and if incorporating, verify director and PSC identities.
2. Days 8–14: register with Companies House or HMRC, obtain your Unique Taxpayer Reference, open a business bank account, and set up a bookkeeping system.
3. Days 15–30: finalise contracts and terms of business, arrange insurance, register for PAYE if you’re hiring, and prepare your first invoices.

Building in a business incorporation review at the Day 1–7 stage catches structural mistakes before they’re baked into your filings.

A solicitor’s view on where new businesses go wrong

Getting identity verification wrong is the single most common reason incorporations stall right now. Since ECCTA came into force, inaccurate PSC records have become a frequent cause of rejected filings, and re-filing costs both time and money you don’t need to lose in your first month of trading.

Shareholder agreements, contract transfers, complex VAT positions, and any cross-border trade are exactly where founders get into trouble without legal input. These aren’t areas where a template does the job.

Ali Legal Ltd supports founders through company formation with fixed-fee packages and document packs, so the legal groundwork is solid before you start trading.

Which advisor should you hire first?

Hire an accountant first if your needs are basic tax, VAT, and bookkeeping. Hire a solicitor first if you’re bringing in co-founders, transferring contracts, or need regulatory sign-off. Balance the fixed cost against the compliance risk you’re actually carrying.

— Panagiotis

Get your incorporation and compliance right the first time

Ali Legal Ltd gives you a fixed-fee route through incorporation that avoids the two mistakes that trip up most new companies: botched identity verification and PSC registers that don’t hold up under scrutiny. Rather than piecing together guidance from GOV.UK and hoping your paperwork survives Companies House review, you get a solicitor checking director and PSC details, drafting shareholder agreements, and building your articles of association correctly from the start.

That matters most in the first three months, when a rejected filing can delay your Corporation Tax registration and knock your whole timeline off course. Ali Legal Ltd’s corporate law services cover incorporation support, ongoing compliance packages, and the shareholder and governance documents that keep a growing company out of dispute later. If you’re weighing up structures or ready to incorporate, get in touch with Ali Legal Ltd to talk through fixed-fee options before you file.

Sources

• Gov
• Business

Recommended

• Business Incorporation Explained: Why It Matters for UK Start-ups
• Company Formation UK: Legal Steps and Business Impact
• 7 Essential Corporate Law Dos and Don’ts for UK SMEs
• How solicitors simplify licensing for UK businesses