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Accounting

Preparing Your Annual Accounts: Key Deadlines for 2026

A step-by-step guide to year-end accounts and Corporation Tax filing for UK businesses.

📅 2 Sep 2026◷ 6 min read✍ ZFK Accountants Team
01Introduction

What are annual accounts?

Annual accounts provide a structured financial picture of a company's activity over its accounting period.

They are prepared using the company's accounting records and typically include information relating to income, expenses, assets, liabilities and the overall financial position of the business.

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Good to know

Preparing your bookkeeping and supporting records before your year end can make the annual accounts process much smoother.

02Preparation

What records may be needed?

Good record keeping is one of the most important parts of preparing accurate annual accounts.

The information required will depend on the company and its activities, but organised records allow the accounts to be prepared more efficiently.

  • ✓Bank statements
  • ✓Sales records
  • ✓Purchase invoices
  • ✓Expense records
  • ✓Payroll information where applicable
  • ✓Asset and finance information
03Corporation Tax

How annual accounts connect with Corporation Tax

The company's accounting information forms an important part of calculating its Corporation Tax position.

Preparing the accounts accurately helps ensure that the relevant tax calculations and filing information are based on reliable financial records.

04Key deadlines

Keep track of your filing deadlines

Companies can have several different accounting and tax deadlines to manage.

Maintaining a clear filing calendar and preparing records early can help reduce the risk of missed deadlines.

05Common mistakes

Common year-end accounting mistakes

Many year-end problems are caused by incomplete records or bookkeeping issues that have accumulated during the year.

  • ✓Missing purchase invoices
  • ✓Unreconciled bank transactions
  • ✓Incorrect expense classifications
  • ✓Incomplete payroll records
  • ✓Leaving bookkeeping until the year end
06Professional support

How an accountant can simplify the process

Professional accounting support can help organise the year-end process, identify missing information and prepare the required accounts and tax information.

It can also give business owners a clearer understanding of their financial position.

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