What Happens After You Incorporate? The First 30 Days Checklist for UK Start-Ups

Introduction

What happens after UK company incorporation?

As soon as Companies House approves your application, your limited company becomes a separate legal entity. It can enter contracts, hold assets, receive income, employ staff and take on liabilities in its own name.

Companies House will issue your Company Registration Number, commonly called a CRN, and automatically notify HMRC that the company has been formed. HMRC will then post your Corporation Tax Unique Taxpayer Reference, or UTR, to the registered office address. It usually arrives within 14 working days.

From this point onwards, the directors take on legal responsibilities under the Companies Act 2006. These duties include maintaining accurate company records, protecting the company’s interests, submitting statutory documents and meeting the relevant filing deadlines.

Documents you should have in hand

By the end of the incorporation process, you should have access to:

• Your Certificate of Incorporation
• The company’s Memorandum and Articles of Association
• Share certificates for each shareholder
• Your Company Registration Number
• Your Corporation Tax UTR, once HMRC sends it

Keep both digital and physical copies of these documents in a secure and accessible location. Banks, investors, insurers, accountants and HMRC may request them at different stages of your company’s development.

Week 1: Legal and Administrative Setup

The first week should focus on creating a clear legal and administrative foundation. Although some of these tasks may seem routine, completing them early can prevent larger problems later.

Set up your statutory registers

Every UK limited company must maintain certain statutory registers. These records usually include:

• A register of members or shareholders
• A register of directors
• A register of People with Significant Control
• A register of company secretaries, where applicable

These registers provide an official record of the people who own, control and manage the company. They are not simply an administrative preference. Maintaining them is a legal requirement, and the relevant authorities may request access to the records.

You should update the registers whenever ownership, control or director information changes. Leaving them until the year-end accounts are due often creates unnecessary confusion, especially when shares have been issued or transferred during the year.

Confirm your registered office and SIC code

Your registered office is the company’s official correspondence address. Companies House, HMRC and other public bodies will use it to send important notices, tax references and filing reminders.

Therefore, the address must be reliable and capable of receiving official post. When directors use a home address as the registered office, that address may appear on the public Companies House register. Many founders prefer to use an accountant’s address or a professional registered office service for additional privacy.

At the same time, check that your Standard Industrial Classification, or SIC, code accurately reflects the company’s main trading activity. Your SIC code may affect how insurers, lenders, banks and other organisations assess the business.

If the code does not properly describe what the company does, update it rather than leaving inaccurate information on the public record.

Open a business bank account

A limited company is legally separate from its directors and shareholders. For that reason, its finances should also remain separate.

Using a personal bank account for company transactions creates confusion from day one. It makes bookkeeping harder, complicates expense claims and weakens the financial separation that sits at the heart of the limited company structure.

Most business banks will ask for:

• Your Certificate of Incorporation
• Identification for each director
• Proof of address
• Details of shareholders or People with Significant Control
• A short description of the company’s trading activities

Traditional high-street banks may take between 5 and 15 working days to approve a new account. By comparison, fintech providers such as Tide, Starling Business and Revolut Business may complete the process within 1 to 3 working days.

The fastest option is not always the best one, however. Compare transaction charges, international payment fees, cash deposit facilities, accounting software integrations and customer support before making your decision.

Arrange business insurance

The insurance you need will depend on the company’s industry, services, workforce and level of risk. Nevertheless, three policies commonly apply to new businesses.

Employers’ liability insurance becomes a legal requirement in most cases as soon as the company employs staff.

Professional indemnity insurance can protect consultants, agencies, accountants, advisers and other service-based businesses against claims involving professional mistakes, negligence or inadequate advice.

Public liability insurance may cover claims involving injury or property damage. It is particularly relevant when you meet clients, visit customer premises or carry out work in public spaces.

Do not treat insurance as something to arrange only after the company starts growing. One early claim could create a serious financial problem for a new business.

Week 2: HMRC Registrations

Once your basic company administration is in place, turn your attention to HMRC. The registrations you need will depend on how and when the business starts trading.

Register for Corporation Tax

You must register your company for Corporation Tax within three months of it becoming active.

A company normally becomes active when it starts carrying out business-related activities. This could include:

• Selling goods or services
• Receiving business income
• Hiring employees
• Advertising services
• Entering commercial contracts
• Buying stock with the intention of trading

The deadline does not necessarily begin on the date of incorporation. However, once genuine trading activity starts, you should not delay the registration.

HMRC may issue penalties when a company fails to register on time, even if the business has made no profit or owes no Corporation Tax. Therefore, it makes sense to complete the registration as soon as you know the company has become active.

Register for PAYE if you plan to draw a salary

You must normally register as an employer before paying a salary to a director or employee. This means PAYE may apply even when the company has no staff other than you.

Many owner-managed companies use a combination of salary and dividends. Depending on the director’s wider circumstances, this structure may be more tax-efficient than taking all income in one form. However, any salary element still needs to run through an appropriate payroll system.

Register early rather than waiting until the first payday. HMRC may need several working days to issue the company’s PAYE references, and you will need these details to complete payroll reporting correctly.

Assess VAT registration carefully

VAT registration becomes compulsory when a company’s taxable turnover exceeds the £90,000 registration threshold within a rolling 12-month period.

The phrase “rolling 12-month period” matters. You should not check turnover only at the end of the accounting year. Instead, review the previous 12 months at the end of every month.

Some businesses choose to register voluntarily before reaching the compulsory threshold. This may make commercial sense when:

• Most customers are already VAT-registered businesses
• The company expects significant VATable setup costs
• The business wants to reclaim VAT on equipment or software
• The company expects rapid growth
• VAT registration would improve its credibility with larger clients

However, voluntary registration also brings additional reporting and pricing responsibilities. For example, a business selling mainly to consumers may find that adding VAT makes its prices less competitive.

Every newly VAT-registered business must follow Making Tax Digital requirements from the outset. As a result, you will need compatible accounting software and reliable digital records.

Week 3: Financial Systems and Bookkeeping

By the third week, you should start building the systems that will support your day-to-day financial management. Good bookkeeping is much easier when you establish consistent habits early.

Choose your accounting software

Xero, QuickBooks and Sage remain three of the most widely used cloud accounting platforms in the UK. Each platform supports Making Tax Digital and offers features such as:

• Automatic bank feeds
• Invoice creation
• Expense tracking
• Receipt capture
• VAT reporting
• Payroll integrations
• Financial reports

The right software depends on the nature of your business. A freelancer sending five invoices a month has very different requirements from an online retailer processing hundreds of daily transactions.

Tax Care works with Xero, QuickBooks and Sage. Therefore, we help founders select software based on their industry, reporting requirements, transaction volume and growth plans rather than simply recommending the same platform to every business.

Set up your chart of accounts correctly

Your chart of accounts determines how your accounting software categorises income, expenses, assets, liabilities and equity.

Getting the structure right at the beginning saves time and reduces the risk of inaccurate reporting. By contrast, a poorly organised chart of accounts often leads to expensive clean-up work before the first set of annual accounts can be prepared.

Common early mistakes include:

• Recording equipment purchases as ordinary day-to-day expenses
• Putting personal transactions through the company
• Using one general category for unrelated costs
• Failing to separate director loans from business income
• Missing allowable costs such as mileage, home-working expenses or professional subscriptions

The categories should reflect how your business actually operates. Clear records will also help you understand where the company earns money and where it spends it.

Start capturing receipts and invoices immediately

Do not wait until the end of the month, or worse, the end of the financial year, to organise your paperwork.

HMRC normally requires companies to keep relevant accounting records for six years from the end of the financial year to which they relate. These records may include invoices, receipts, contracts, bank statements, payroll reports and supporting evidence for expense claims.

Digital tools such as Dext, AutoEntry and Hubdoc can make the process easier. They scan receipts, extract key details and send the information directly to your accounting software.

Develop a simple routine from the start. For example, upload receipts as soon as you receive them and reconcile the business bank account every week. A few minutes of regular bookkeeping can prevent hours of reconstruction later.

Reclaim pre-incorporation expenses

Many founders spend money before the company officially exists. They may pay for market research, equipment, professional advice, branding, website development or company formation costs from their personal funds.

In many cases, the company can reimburse legitimate pre-incorporation expenses once it has been formed. Certain qualifying costs from earlier periods may also be available for tax relief, depending on the type of expense and the surrounding circumstances.

This can provide a useful cash-flow boost during the company’s first month. However, you should keep invoices and proof of payment and make sure each expense was incurred wholly for the future business.

An accountant can help you separate valid company expenses from costs that remain personal or do not qualify.

Week 4: Building the Foundation for Growth

The final week should focus on longer-term organisation. By now, the company may be ready to trade, but it also needs a plan for staying compliant throughout the year.

Appoint an accountant before you urgently need one

Managing everything yourself may look cheaper at the beginning. In practice, DIY accounting often becomes more expensive when errors need to be corrected.

Missed tax reliefs, incorrect VAT treatment, inaccurate payroll submissions and poorly maintained records can quickly create additional costs. The same applies when directors overlook opportunities involving capital allowances, employment allowance, R&D tax relief or pre-incorporation expenses.

A specialist start-up accountant can support you with:

• Corporation Tax registration
• PAYE and payroll setup
• VAT planning and registration
• Salary and dividend planning
• Cash-flow forecasting
• Bookkeeping systems
• Management reporting
• Annual accounts
• Corporation Tax returns

More importantly, early advice allows you to make decisions before they create tax or compliance consequences.

If you are still considering whether you need professional support, our team offers a free initial consultation through our start-up accountant service.

Diarise your key filing deadlines

Do not rely entirely on email reminders from HMRC or Companies House. Add the key dates to your business calendar and set reminders well in advance.

Your exact deadlines may vary according to the company’s accounting period, VAT scheme, payroll frequency and date of incorporation. Check the company’s official records rather than relying only on general examples.

Plan for your first year-end

Companies House normally sets a new company’s accounting reference date as the final day of the month in which the first anniversary of incorporation falls.

For example, if you incorporate during June, the first accounting reference date will usually fall on 30 June in the following year. However, the company’s first accounting period may cover slightly more than 12 months.

Some founders choose to shorten or extend the first accounting period. They may want to align it with the tax year, the calendar year, a group reporting date or a quieter trading season.

Discuss this decision with your accountant during the first month. Changing the year-end is often easier before reporting deadlines approach, and the decision may affect both tax planning and administrative workload.