Your first 30 days after forming a limited company

First: check the documents and register

Save the certificate of incorporation, memorandum and articles, statement of capital and any provider paperwork. Check the company name, number, registered office, directors, shareholders and PSC information against your intended setup.

An error in the register can affect account applications and correspondence. Ask the provider or adviser how to correct it through the appropriate process. Keep the company authentication code and individual personal codes secure; these are different from the public company number.

Set up a clean money trail

Open an appropriate account in the company’s name and make sure you understand any remaining onboarding steps. Record shareholder payments, founder loans and initial expenses accurately. A transfer from your personal account could be share capital or a loan depending on the arrangement.

Create a bookkeeping process before transactions multiply. Keep receipts, invoices and explanations of business spending. Agree with your accountant how to treat costs paid personally before incorporation; do not simply reimburse yourself without considering the basis.

Identify the start of business activity

The company generally needs Corporation Tax registration within three months of starting to do business. Buying stock, advertising, employing someone or receiving income can be relevant; the first invoice is not always the start.

Look out for HMRC correspondence and your company UTR. Check whether payroll, VAT or other registrations are needed. Incorporation does not automatically settle every tax-registration obligation or sector-specific permission.

Put the correct legal details in the right places

Update your website, relevant emails, invoices, order forms and other business documents with the disclosures required for a limited company. Typical information includes the registered name, company number, registered office and jurisdiction of registration on the relevant materials.

If you use a trading brand, make the underlying legal entity clear. Check whether contracts, insurance or supplier arrangements started before incorporation need to be transferred or reissued. A new company is not automatically a party to a contract you signed personally.

Create the calendar while the company is new

Check the actual first accounts due date on the Companies House register. Record the confirmation statement review period and any identity verification role-linking requirements. Ask your accountant to confirm HMRC periods and payment deadlines.

Set earlier preparation reminders and decide who monitors official post and the registered email. If you hire staff, plan employment, payroll, pension and insurance requirements before the first payday. The first month is a good time to establish habits that prevent expensive catch-up later.

Worth knowing: A certificate confirms incorporation; it does not confirm that your business is ready to trade in every regulated sector.

Days 1–7: assemble a usable company handover file

Download the certificate of incorporation, articles, memorandum and issued share documents. Compare the register with your approved application: registered name, jurisdiction, registered office, directors, ownership and SIC codes. A certificate confirms legal existence; it does not confirm that every entry is commercially correct. Investigate errors promptly rather than leaving them for next year’s confirmation statement.

Keep company authentication details and personal verification codes secure and separate from public documents. Record any PSC role-linking deadline and ensure the relevant person knows what they must submit. Give your accountant the financial year end, actual business start and any HMRC correspondence, not simply a company number.

Open or complete the intended account, pay for shares as agreed and record whether any founder funding is share capital or a loan. Set up company-specific bookkeeping. If expenses were incurred before incorporation, collect receipts and ask how they should be treated; not every personally paid cost becomes a company deduction automatically.

Days 8–30: turn registration into repeatable controls

Use a simple monthly close: reconcile the bank, review unpaid invoices and supplier bills, classify director transactions, estimate tax and back up records. An owner should be able to explain each transfer between personal and company accounts. A bank feed without receipts is not enough.

Track the Corporation Tax activity start and registration requirement. Monitor VAT turnover on a rolling basis. Before paying remuneration, establish payroll reporting and any applicable employment or pension duties. Update website disclosures, invoices, contracts and insurance so the company is clearly the operating entity.

Create the filing calendar using actual dates, then name the person responsible for each deadline. If an accountant will file, agree the records handover date and obtain acceptance receipts afterwards. For ANNA’s entry subsidy, the advertised account-opening deadline is within 10 days; do not let the first-month checklist obscure an earlier contractual condition.

Decide Your First Accounting Reference Date (ARD)

When you incorporate your company, Companies House automatically sets your first Accounting Reference Date (ARD) to the last day of the month one year after incorporation. For a company formed on 10 October 2026, the ARD will be 31 October 2027. This date determines the end of your company's financial year and sets the deadline for filing your annual accounts and Company Tax Return. You have the right to change this date. A common strategy is to align your ARD with the UK tax year end, 31 March, or the calendar year end, 31 December. Aligning to 31 March simplifies calculations involving tax legislation, which often changes on 6 April.

Your choice has practical consequences. The deadline for filing your first accounts with Companies House is 21 months after the date of incorporation. For subsequent years, it's 9 months after your ARD. The deadline to pay your Corporation Tax is typically 9 months and one day after your accounting period ends, and the filing deadline for your tax return is 12 months after it ends. Changing your ARD can either shorten or lengthen your first accounting period, but it cannot exceed 18 months unless you get special permission. Within the first month, decide if the default date works for your business or if changing it would provide a strategic or administrative advantage.

Worth knowing: Your default Accounting Reference Date can be changed to simplify administration or align with tax changes, but consider the impact on your first set of deadlines.

VAT Registration: Compulsory vs. Voluntary

Your company must register for Value Added Tax (VAT) with HMRC if its VAT taxable turnover exceeds the £90,000 threshold in a rolling 12-month period. This is compulsory registration. It's a common and costly mistake for new businesses to breach this threshold without realising, leading to backdated VAT payments and penalties. You should implement a system to monitor your turnover monthly. Once you expect to cross the threshold within the next 30 days alone, or if you have already crossed it in the past 12 months, you must register. Registration commits your company to charging VAT on its taxable sales (output tax) and filing regular VAT returns with HMRC.

However, you can also choose to register voluntarily even if your turnover is below the threshold. The primary benefit is the ability to reclaim VAT on your business purchases and expenses (input tax), including on goods and services bought up to 4 years before registration. This is particularly advantageous if you have significant startup costs or if your customers are themselves VAT-registered businesses, as they can simply reclaim the VAT you charge them. Conversely, if your customers are mainly the general public, adding 20% VAT will make your services more expensive, potentially putting you at a competitive disadvantage against non-registered sole traders or smaller firms.

• Common Mistake: Forgetting that the £90,000 threshold is a *rolling* 12-month total, not a fixed financial year total. Check your cumulative turnover at the end of every month.
• Edge Case: If you acquire a business as a 'going concern', its turnover in the months prior to your acquisition counts towards your own rolling 12-month total.
• Procedure: VAT registration is done online via the GOV.UK website. You will need your Government Gateway ID, company details, and an estimated turnover for the next 12 months.
• Cost: While registration is free, the administrative cost of maintaining VAT records and filing returns (usually quarterly) can be significant. Most businesses use accounting software or an agent.

Worth knowing: Voluntary VAT registration is a strategic choice: it lets you reclaim VAT on costs but increases prices for non-VAT-registered customers and adds administrative burden.

Complying with Director & PSC Identity Verification

Since 18 November 2025, a critical step for all new company directors and Persons with Significant Control (PSCs) is mandatory identity verification. This measure, part of the Economic Crime and Corporate Transparency Act, aims to increase corporate transparency and combat fraud. When your company is formed, or when a new director or PSC is appointed, they must verify their identity with Companies House through a digital process. This typically involves using a GOV.UK One Login account and providing details from a document like a UK passport or driving licence, combined with a facial recognition check via a smartphone app. Failure to complete this process will prevent the appointment from being officially registered.

This is not a one-off task at incorporation. The company must maintain a verified status for all its directors and registrable PSCs. If a director fails to complete verification, they commit an offence, and the company also commits an offence for allowing them to act. The company's register of directors must now include a statement confirming that the identity of each director has been verified. You should establish a clear onboarding procedure for any new director or PSC that includes identity verification as a non-negotiable first step. This process is managed directly between the individual and Companies House, but the company is responsible for ensuring it happens and is correctly recorded.

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   Step 1: The proposed director or PSC creates or accesses their GOV.UK One Login account.

2. 2

   Step 2: They follow the Companies House identity verification service link, which will require them to use a mobile device to scan their photo ID (e.g., passport) and perform a liveness check (e.g., take a selfie).

3. 3

   Step 3: Once Companies House confirms verification, the individual receives a unique identifier or confirmation.

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   Step 4: The company (or its formation agent) uses this confirmation when filing the appointment of the new director or PSC with Companies House.

5. 5

   Step 5: The company must then update its internal statutory registers to record that the director's identity has been verified.

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   Step 6: Set a recurring calendar task to check the status of all directors and PSCs annually before filing the confirmation statement.

Worth knowing: Mandatory identity verification for directors and PSCs is a legal duty for both the individual and the company, requiring a formal procedure for every new appointment.

Structuring a Tax-Efficient Director's Salary

As a director, you are an employee of your company, and one of your first decisions is whether to draw a salary. While taking all profits as dividends is an option, it is often more tax-efficient to pay a small salary. A salary is a deductible expense for the company, reducing its Corporation Tax bill. The key is to set the salary at a level that optimises National Insurance Contributions (NICs). By paying a salary above the Lower Earnings Limit (LEL), you gain a qualifying year for your State Pension record without actually paying any employee NICs, provided the salary is below the Primary Threshold.

For the 2026/27 tax year, the optimal salary is typically between the Employer's NIC Secondary Threshold (around £5,000) and the Employee's NIC Primary Threshold (around £12,570). Paying a salary up to the Secondary Threshold incurs no employee or employer NICs. Paying above this but below the Primary Threshold will trigger employer's NICs at 15% on the amount above the threshold, but still no employee NICs. While this creates a small cost in employer's NICs, the Corporation Tax saving (19% on the full salary) usually outweighs this cost, making it the most efficient strategy for a sole director-shareholder, as illustrated below.

Worth knowing: For a solo director-shareholder, a small salary set near the employee National Insurance threshold typically maximises your net income by reducing Corporation Tax liability.

Claiming Pre-Trading Expenses & Managing Director's Loans

Before your company officially starts trading, you will likely incur costs personally, such as for equipment, professional advice, or website design. These are known as pre-trading expenses. HMRC allows your new company to claim tax relief on these costs as if they were incurred on its first day of trading, provided they were incurred within 7 years of that date. The crucial rule is that the expense must be 'wholly and exclusively' for the purpose of the trade the company is about to start. This means you can't claim for the cost of forming the company itself (a capital cost) or for entertaining potential clients.

To claim these expenses, you must be reimbursed by the company. This is often done by creating a director's loan account, which is a record of all transactions between you and the company. When the company repays you for these pre-trading expenses, it reduces the amount the company owes you. You may also lend the company money to get it started. This is perfectly legal, and the company can repay you from its profits without any tax implications. However, if you take a loan *from* the company and it is not repaid within 9 months of the company's year-end, the company may have to pay a temporary tax (known as s455 tax) at a rate equivalent to the higher dividend tax rate.

• Record Keeping: Keep meticulous receipts for all pre-trading expenses. Create a formal expense claim and have the director(s) approve it in a board minute.
• Director's Loan Account: Use accounting software to maintain a clear and current Director's Loan Account. Do not mix personal and business finances in the company bank account.
• Common Mistake: Directors treating the company bank account as their own, withdrawing funds without declaring them as salary or dividends. This creates a director's loan with potential tax consequences.
• Interest: If the company pays you interest on the money you've lent it, this is a taxable income for you personally but a deductible expense for the company.

Worth knowing: Properly documenting pre-trading expenses and director's loans is crucial for tax efficiency and avoiding penalties associated with overdrawn loan accounts.

Registering with the Information Commissioner's Office (ICO)

If your new company processes personal data, you are legally required to register with the Information Commissioner's Office (ICO) and pay an annual data protection fee. 'Processing personal data' has a very broad definition: it includes storing customer names and email addresses, holding employee details, or using CCTV. It is almost certain that any active limited company will be processing personal data in some form. The only exemptions are for organisations that process personal data only for core business purposes like staff administration, advertising, and accounting, but this exemption is narrow and rarely applies to a limited company with external customers.

Failure to pay the fee can result in a fine of up to £4,000, so this is a small but important compliance step to take within your first month. The fee is tiered based on your turnover and number of staff. For most new companies, the fee will be in the lowest tier. Registration is a simple online process. Paying the fee is just the first step; you must also ensure your company complies with the principles of the UK General Data Protection Regulation (UK GDPR), such as having a privacy policy, ensuring data is secure, and respecting individuals' data rights. The ICO registration demonstrates a basic commitment to data protection compliance.

Worth knowing: Nearly every limited company must register with the ICO and pay an annual fee; for startups, this is typically £52 and is a foundational step in data protection compliance.

Common questions

Official sources & further reading

This guide draws on the official guidance below. Rules, fees and individual circumstances can change; check the relevant source before acting.

• GOV.UK: Running a limited company
• GOV.UK: Register for Corporation Tax
• GOV.UK: Company records
• GOV.UK: Business disclosures

General UK information, primarily for private companies limited by shares. This is not personalised legal, tax or financial advice. An accountant or solicitor can help apply the rules to your situation.