Register your business name with Companies House if forming a limited company, ensuring it's unique and compliant.

Open a separate business bank account to keep personal and business finances distinct, simplifying record-keeping.

Register for Self Assessment with HMRC if you're a sole trader or partner, to report your income and pay tax.

Check if you need to register for VAT, typically required if your turnover exceeds £90,000 annually.

Understand Making Tax Digital (MTD) requirements for VAT and, eventually, income tax, using software like Xero or QuickBooks.

Set up accounting software from the start for efficient bookkeeping and real-time financial insights.

Create a business plan outlining your goals, target market, and financial projections to guide your growth.

Obtain any necessary licenses or permits for your industry, such as for hospitality or construction.

Establish a payroll system if you plan to hire employees, including registering as an employer with HMRC.

Maintain accurate records of all income and expenses from the beginning to ease tax filings and compliance checks.