Financial Checklist: Starting a Business in the UK in 2026

Step 1 — Register as self-employed with HMRC

You must register for Self Assessment by 5 October of the tax year after you first start trading. If you started in May 2026, you must register by 5 October 2026.

Register online at gov.uk/register-for-self-assessment. You will need a Government Gateway account — if you do not have one, create it at the same time. HMRC will issue your Unique Taxpayer Reference (UTR) within 10 working days.

Registering late attracts a £100 penalty. There is no benefit to delaying.

Step 2 — Decide on your business structure

Sole trader: Simple, low admin, all profits are yours, unlimited personal liability. Appropriate for most new freelancers and consultants.

Limited company: Separate legal entity, limited liability, potentially more tax-efficient at higher profits, but more admin. Typically not worth incorporating below £40,000-£50,000 annual profit.

If in doubt, start as a sole trader. Incorporating later is straightforward and can be done once the business is established and profitable.

Step 3 — Open a dedicated business bank account

This is not a legal requirement for sole traders, but it is essential for clean bookkeeping. Mixing personal and business transactions makes reconciliation difficult and increases the risk of overclaiming or underclaiming expenses.

Popular business bank accounts for UK sole traders:

• Starling Business: Free, instant setup, excellent Xero integration
• Monzo Business: Free (Lite) or £5/month (Pro), good cashback features
• Tide: Free, built for sole traders and freelancers
• Barclays, NatWest, Lloyds: Traditional banks with dedicated business accounts (monthly fees apply)

Open the account using your personal details as the account holder (sole traders operate under their own name).

Step 4 — Set up accounting software

Register for Xero or QuickBooks immediately. Do not start with spreadsheets — you will migrate later anyway, and clean records from day one are worth more than saving a monthly subscription.

Connect your business bank account via bank feed. Set up expense categories that match your business costs. Create your first invoice template.

The time you spend setting up accounting software properly at the start saves hours of reconciliation work later.

Step 5 — Assess your VAT position

If you expect your taxable turnover to exceed £90,000 in any rolling 12-month period, you must register for VAT. If you are starting a business expected to grow quickly, monitor your monthly turnover from day one.

Consider voluntary VAT registration early if your clients are primarily VAT-registered businesses — you will reclaim VAT on purchases, which may outweigh the admin burden.

Step 6 — Set up an expense tracking system

Decide on a system for capturing receipts from day one. Options:

• Xero app (photograph receipts, auto-code in software)
• Hubdoc (linked to Xero, excellent for recurring bills)
• A simple folder in your email labelled "Business Receipts"

The system matters less than the habit: every business receipt goes into the system immediately. Receipts you cannot produce at year-end mean expenses you cannot claim.

Step 7 — Understand your tax timeline

As a new sole trader starting in 2026:

• Your first Self Assessment tax return covers the 2026/27 tax year (6 April 2026 to 5 April 2027)
• This return is due by 31 January 2028
• Your first tax payment is also due 31 January 2028
• If your bill exceeds £1,000, HMRC will set up payments on account from January 2028

Set aside 25-30% of profits in a separate account throughout the year. This prevents a January shock.

Step 8 — Consider professional support

A bookkeeper from the start is cheaper than rectifying a year of errors. Even a quarterly review engagement ensures your records are correct, your VAT returns are right, and your year-end accounts are based on clean figures. The cost is a deductible business expense.

Trying to manage bookkeeping yourself while running a new business is possible — but the opportunity cost of the time, and the risk of errors that affect your tax, often makes professional support the better financial decision.