First-Year Accounting Checklist for a New UK Limited Company

Starting a UK limited company involves more than registering with Companies House and opening a business bank account. From the moment a company is incorporated, its directors must understand their accounting responsibilities, maintain accurate records, meet filing deadlines and ensure the business complies with HMRC requirements. For new founders, the first financial year can be confusing. Companies House accounts, Corporation Tax returns, VAT registration, payroll and confirmation statements all serve different purposes, and their deadlines do not necessarily fall on the same date.

The best approach is to establish an accounting system early, track important dates and keep business transactions properly documented. This reduces the risk of penalties, prevents avoidable administrative problems and gives directors a clearer picture of the company's financial position. This first-year accounting checklist explains what new UK limited companies need to do, when to do it and which mistakes to avoid.

1. Understand Your Company's Accounting Responsibilities

A UK private limited company has reporting obligations separate from those of its directors and shareholders. Even if the company has one director, no employees or very little income, its legal responsibilities do not automatically disappear. Three organisations are particularly important:

• Companies House: Receives statutory annual accounts and confirmation statements.
• HM Revenue and Customs (HMRC): Administers Corporation Tax, VAT and employer tax obligations.
• Your accounting system or accountant: Helps maintain reliable records, calculate liabilities and prepare required filings.

A company's first accounting year is not necessarily the same as its first Corporation Tax accounting period. Statutory accounts may cover more than 12 months, but a Corporation Tax accounting period cannot exceed 12 months. Consequently, some companies must submit two Company Tax Returns for the period covered by their first statutory accounts. Understanding this distinction at incorporation can prevent missed tax deadlines later.

2. Set Up a Dedicated Business Bank Account

A limited company is a separate legal entity from its owners. Its money should therefore be managed separately from the personal finances of its directors and shareholders. Open a suitable business bank account and use it for company income and expenditure wherever possible. Record transactions such as:

• Customer payments and sales receipts.
• Software subscriptions and website hosting.
• Business travel and other legitimate expenses.
• Equipment purchases and professional fees.
• Money introduced by directors or shareholders.
• Payments made to directors, including salaries and dividends.

If a founder pays a genuine company expense personally, retain the receipt and record the amount correctly. Depending on the circumstances, the company may owe the director reimbursement or the payment may need another accounting treatment. Similarly, money transferred from a director's personal account into the company should not automatically be treated as sales income. It may represent a director's loan, share capital or another type of funding.

Practical tip: Reconcile your business bank transactions against your accounting records every month. Small discrepancies are much easier to investigate before they accumulate.

3. Establish a Reliable Bookkeeping System

Bookkeeping is the process of recording and organising a company's financial transactions. It forms the foundation of statutory accounts, tax calculations and management reporting. You can use accounting software, spreadsheets or an accountant-supported system, provided the records are accurate, complete and appropriate for your company's obligations. At a minimum, maintain records of:

• Sales invoices and receipts.
• Supplier invoices and expense receipts.
• Bank statements and payment records.
• Assets purchased by the company.
• Loans, borrowing and finance agreements.
• Payroll records, where applicable.
• VAT records, if registered.
• Dividends and director transactions.
• Money owed to the company and amounts it owes others.

Keep supporting documents alongside the relevant entries. A bank statement may prove that a payment occurred, but it does not always establish what the payment was for or whether it qualifies as a deductible business expense. Companies must generally keep accounting records for at least six years from the end of the financial year to which they relate for Corporation Tax purposes, although longer retention may be required in certain circumstances.

Choose an accounting method and use it consistently

Most limited companies prepare statutory accounts using accrual accounting. Under this approach, income and expenses are generally recognised in the accounting period to which they relate, rather than simply when money enters or leaves the bank account.

For example, if the company receives a £3,000 invoice for professional services in March but pays it in April, the expense may belong in the earlier accounting period, depending on the circumstances. Correctly recording unpaid invoices, accrued expenses, prepayments and depreciation helps ensure the accounts reflect the company's financial position.

4. Record Expenses, Assets and Director Transactions Correctly

One of the most common first-year accounting mistakes is treating every outgoing payment as an ordinary business expense. The accounting treatment depends on what the company purchased and why.

Business expenses

Record legitimate costs incurred wholly and exclusively for the purposes of the business, subject to the relevant tax rules. Common examples include business insurance, accounting fees, eligible software subscriptions and qualifying professional services. Retain evidence of the business purpose, particularly for expenses that could have a personal element.

Equipment and other assets

A laptop, office equipment or machinery expected to be used over several years may need to be recorded as a fixed asset rather than treated in the same way as a routine operating expense. Depreciation and capital allowance rules may also affect the accounting and tax treatment. Do not assume that an item is immediately deductible for Corporation Tax simply because it was purchased for the company.

Director's loans

If a director withdraws money that is not salary, a dividend, an expense reimbursement or another properly classified payment, it may create a director's loan balance. Overdrawn director's loan accounts can trigger additional tax consequences if they are not handled correctly. Directors should therefore keep these transactions documented and avoid using the company bank account as an informal personal wallet.

5. Identify Your First Accounting Period and Filing Deadlines

Your company's incorporation date and accounting reference date determine important reporting deadlines. Companies House generally sets the company's first accounting reference date at the end of the month in which the anniversary of incorporation falls. Directors should verify the actual date and check whether it has been changed.

For most private companies, annual accounts are due at Companies House nine months after the end of the financial year. However, first accounts have special rules. If the first accounts cover more than 12 months, they are generally due by the later of 21 months after incorporation or three months after the accounting reference date. Different rules apply when the first accounts cover 12 months or less.

For example, a company incorporated on 10 January 2026 might have a first accounting reference date of 31 January 2027. If its first accounts cover more than 12 months, the normal first-accounts deadline would generally be 21 months after incorporation, subject to the statutory rules. Do not rely on this example for your own deadline. Check the company's actual Companies House record and official filing guidance.

Create a compliance calendar

Record the following dates as soon as possible:

• First statutory accounts deadline.
• Corporation Tax payment deadline.
• Company Tax Return deadline.
• Confirmation statement review-period deadline.
• VAT return and payment dates, if registered.
• Payroll reporting and payment dates, if applicable.

Allow time for preparing the figures, reviewing the accounts and correcting errors. Waiting until the filing deadline to organise the records leaves little room to resolve problems.

6. Prepare for Corporation Tax

Corporation Tax is generally charged on a company's taxable profits, subject to the applicable rates, reliefs and adjustments. Accounting profit and taxable profit are not always identical. A company may need to adjust its accounting results for items such as non-deductible expenditure, capital allowances and other tax-specific rules.

Know the main deadlines

A Company Tax Return, normally submitted using form CT600 and supporting accounts and computations, is generally due 12 months after the end of the relevant Corporation Tax accounting period. Corporation Tax is usually payable nine months and one day after the end of the accounting period for companies outside the special instalment payment rules. Larger companies may need to pay in instalments.

These are separate deadlines: the payment may be due before the return itself. A company may also have more than one Corporation Tax accounting period during its first statutory accounting year. Do not assume that one annual set of Companies House accounts means there is only one tax return to submit.

What if the company makes no profit?

A company with no taxable profit may have no Corporation Tax to pay, but that does not automatically remove its filing obligations. If HMRC issues a notice requiring the company to deliver a Company Tax Return, the company must generally file it even if it made a loss or has no tax liability. If the company believes it does not need to file, it should follow HMRC's instructions rather than simply ignore the notice. Keep records of sales, expenses, funding and transactions even when the business has not started trading.

7. Check Whether VAT Registration Is Required

VAT registration depends on the company's taxable turnover and circumstances. The standard UK VAT registration threshold is £90,000 of taxable turnover, assessed over a rolling 12-month period. A business may also need to register if it expects taxable turnover to exceed the threshold in the next 30 days alone.

This is not the same as the company's profit, cash balance or total money received from every source. VAT rules distinguish between taxable turnover and other amounts. Some businesses must consider additional rules, including overseas businesses making taxable supplies in the UK. A company should not assume that the £90,000 threshold applies to every situation. If the company registers for VAT, it must generally:

• Charge VAT where required.
• Submit VAT returns by the applicable deadlines.
• Pay VAT due on time.
• Keep appropriate VAT invoices and records.
• Apply the correct rules to purchases, sales and cross-border transactions.

Voluntary registration may be worth considering where the company has significant VAT-bearing costs or mainly sells to VAT-registered customers. However, it can also increase administration and affect pricing for customers who cannot recover VAT. Assess the commercial impact before deciding.

8. Register for PAYE if You Employ Staff or Pay a Director's Salary

If the company employs staff or pays a director through payroll, it may need to register as an employer with HMRC and operate Pay As You Earn (PAYE). Employer registration should normally be completed before the first payday. Payroll responsibilities can include calculating Income Tax and National Insurance deductions, reporting pay information to HMRC and paying amounts due. A director can be an employee for payroll purposes. Therefore, a company with only one director may still have PAYE obligations if it pays that director a salary.

Directors should decide on a suitable remuneration approach after considering the company's circumstances, tax rules and available allowances. Salary, dividends and expense reimbursements are not interchangeable: each has different legal and tax treatment. If the company has no employees and does not pay a director through payroll, PAYE registration may not be necessary. Check the rules before assuming that every newly incorporated company must operate payroll.

9. File the Confirmation Statement

The confirmation statement is a Companies House filing that confirms or updates key information about the company, including details such as its registered office, directors, shareholders and people with significant control, where applicable.

It is separate from annual accounts and does not replace tax returns. A company's first confirmation statement is generally due within 14 days after the end of its first review period. Subsequent confirmation statements are normally due within 14 days after the end of each review period.

Before submitting it, check that the company's details are accurate and that any required changes have been properly recorded. Failure to file can lead to compliance problems and may contribute to Companies House taking action against the company.

10. Review the Company's Financial Position Throughout the Year

Accounting should not be treated as a once-a-year exercise. Regular reviews help directors identify cash-flow pressure, rising costs, unpaid invoices and emerging tax liabilities before they become serious problems. At least monthly, review:

• Cash available in the business bank account.
• Outstanding customer invoices.
• Supplier bills and other liabilities.
• Sales and operating expenses.
• VAT and payroll liabilities, where applicable.
• Director's loan balances.
• Actual performance against the budget.

Consider a simple example: a startup receives £15,000 in customer payments during a month. That does not mean it has £15,000 available to distribute to its owners. Some of the money may need to cover supplier bills, taxes, payroll, loan repayments and future operating costs. Regular bookkeeping turns financial data into useful decisions. It also helps directors identify when the company may need additional funding or changes to its spending.

11. Prepare and File Your First Annual Accounts

Before the first accounts deadline, ensure the bookkeeping is complete and the financial records have been reviewed. The process generally includes:

1. Reconciling bank accounts and payment platforms.
2. Checking sales invoices, expenses and supplier balances.
3. Reviewing assets, depreciation and any applicable tax adjustments.
4. Confirming director's loan balances and dividends.
5. Accounting for unpaid invoices, accruals and prepayments.
6. Preparing the statutory accounts in the required format.
7. Reviewing and approving the accounts before filing.

Small companies may qualify for simplified reporting options, depending on their circumstances and the rules in force. Eligibility for micro-entity or small-company treatment should be assessed rather than assumed. Companies House filing requirements are also distinct from HMRC requirements. A company may need to provide different information for its statutory accounts and its Corporation Tax Return. The joint online service previously used to file company accounts with Companies House and a Company Tax Return with HMRC closed on 31 March 2026. Check the current official filing routes before submitting your documents.

12. Common First-Year Accounting Mistakes to Avoid

New companies can reduce unnecessary costs and compliance risks by avoiding these mistakes:

• Mixing personal and company money: This makes transactions harder to classify and reconcile.
• Leaving bookkeeping until year-end: Missing receipts and forgotten transactions become more difficult to resolve over time.
• Confusing accounts and tax deadlines: Companies House and HMRC have different filing requirements.
• Assuming no trading means no obligations: A dormant or inactive company may still have filing responsibilities.
• Treating every purchase as tax-deductible: Expenses and capital assets can receive different treatment.
• Ignoring HMRC letters: A notice to file a return should not be disregarded simply because the company made no profit.
• Taking dividends without checking the figures: Dividends must meet the relevant legal requirements and be supported by sufficient distributable profits.

An accountant can help establish the correct treatment for complex transactions, review the company's first accounts and identify potential tax issues before filing.

Frequently Asked Questions

1. What does a new UK limited company need to do for accounting in its first year?

It should maintain accurate financial records, separate business and personal transactions, monitor tax obligations, identify filing deadlines, assess whether VAT or PAYE registration is required and prepare its statutory accounts and Corporation Tax returns when due.

2. Does a limited company need an accountant?

No. A company is not generally required to appoint an accountant simply because it is incorporated. Directors can prepare and file accounts themselves if they have the necessary knowledge and comply with the rules. Professional support can be valuable where transactions, tax calculations or reporting requirements are complex.

3. When are a company's first accounts due?

The deadline depends on the incorporation date, accounting reference date and length of the first accounting period. First accounts covering more than 12 months are generally due by the later of 21 months after incorporation or three months after the accounting reference date.

4. Does a company with no income still need to file accounts?

Generally, yes. A company may need to file accounts even if it has not traded or earned income. Its accounting treatment and filing requirements depend on whether it is dormant, active or otherwise subject to reporting obligations.

5. When must a new company register for VAT?

The standard threshold is taxable turnover exceeding £90,000 over a rolling 12-month period, or an expectation that it will exceed the threshold in the next 30 days. Special rules may apply, particularly to overseas businesses.

6. What is the difference between Companies House accounts and a Corporation Tax return?

Companies House accounts report the company's financial position and performance in the required statutory format. A Corporation Tax return reports information HMRC needs to determine the company's tax position. The documents serve different purposes and have different deadlines.

7. How long should a UK limited company keep accounting records?

For Corporation Tax purposes, companies generally need to keep accounting records for at least six years from the end of the financial year they relate to. Longer periods can apply in certain circumstances.

8. Can a director pay company expenses personally?

Yes, where appropriate. The expense should be genuine, supported by evidence and recorded correctly in the company's accounts. The company may owe the director reimbursement, depending on the circumstances.

Conclusion

The first year of running a UK limited company establishes the financial habits that will support its future growth. Accurate bookkeeping, clear separation of company and personal funds, early deadline planning and regular reviews make compliance easier and help directors understand how their business is performing. Start by setting up a reliable accounting system, confirming your company's accounting reference date and creating a calendar for Companies House and HMRC obligations. Then review transactions regularly and seek professional advice when the correct tax or accounting treatment is unclear.

For international founders managing a UK business from abroad, keeping reliable records and understanding local reporting requirements is especially important. IncorpUK, a UK company formation and management platform for global founders, is one resource founders may consider when organising the administrative side of operating a UK company.