Understanding key tax dates is essential for contractors and freelancers operating through limited companies in the UK. Missing a deadline can lead to penalties, cash flow issues, and unnecessary stress, especially when dealing with contract work tax and HMRC compliance.
Whether you’re planning for the start date of the new tax year, checking when the end of the tax year falls, or wondering about corporation tax and dividend deadlines, this guide has you covered. We’ll also clarify common misconceptions around phrases like “when do you pay tax when self employed” and explain how tax works differently for limited company contractors. Let’s start with a clear overview of the key dates you need to know.
Table of Contents:
- Key UK Tax Dates Contractors Must Know
- When Is the Start and End of the UK Tax Year?
- Key Dates for Corporation Tax for Contractors
- Self Assessment Tax Return Dates for Limited Company Directors
- PAYE and Payroll Tax Deadlines for Contractors
- VAT Return and Payment Deadlines
- Dividend Tax Dates Contractors Should Plan For
- Why Missing Tax Dates Costs Contractors More
- How Nexus Accounting Helps Contractors Stay Compliant
Key UK Tax Dates Contractors Must Know
Contractors operating through limited companies are subject to multiple HMRC deadlines throughout the year. The most important tax dates affect corporation tax, PAYE, VAT, and personal Self Assessment returns.
Understanding these dates allows you to:
- Avoid late filing penalties
- Plan cash flow accurately
- Optimise tax efficiency on contract income
Unlike umbrella workers or sole traders, limited company contractors have dual responsibilities, both company and personal tax obligations.
When Is the Start and End of the UK Tax Year?
What is the start date of the new tax year in the UK?
The start date of the new tax year in the UK is 6 April every year, marking the point at which new tax allowances apply, income tax bands reset, and dividend and personal allowances are refreshed. For contractors operating through limited companies, this date is particularly important for planning dividend payments, pension contributions, and director salary adjustments to ensure tax efficiency for the year ahead.
When is the end of the tax year?
The end of the tax year is 5 April. Any income, dividends, or benefits received by this date fall into that tax year.
Why this matters for contractors:
- Dividend timing can reduce personal tax
- Pension contributions can be maximised before the year closes
Planning around the tax year-end is one of the most effective strategies for limited company contractors.
Key Dates for Corporation Tax for Contractors
When do limited company contractors pay corporation tax?
Corporation tax is due 9 months and 1 day after your company’s accounting period ends. For example, if your company year-end is 31 March 2025, corporation tax is due by 1 January 2026.
Corporation Tax Filing Deadline
Your Company Tax Return (CT600) must be filed within 12 months of the end of your accounting period.
Missing this deadline can result in:
- Automatic penalties
- Interest on unpaid tax
- Increased HMRC scrutiny
We recommend aligning your company year-end with 31 March or 5 April to simplify tax planning.
Key Takeaways for Contractor National Insurance
- Limited company invoices must include accurate legal and company details
- Each invoice should have a unique reference number
- Clear service descriptions help avoid disputes
- VAT-registered companies must follow strict VAT invoice requirements
- Professional invoices support faster payments and HMRC compliance
Self Assessment Tax Return Dates for Limited Company Directors
As a contractor-director, you must submit a Self Assessment tax return if you:
- Receive dividends
- Earn income outside PAYE
- Claim certain reliefs
Key dates:
- 31 October: Paper tax return deadline
- 31 January: Online tax return deadline
When is tax due for Self Assessment?
Any personal tax owed (usually on dividends) is payable by the 31 January following the tax year.
This often causes confusion with searches like “when do you pay tax when self employed”. For limited company contractors, this tax relates to dividend income, not self-employed profits.
PAYE and Payroll Tax Deadlines for Contractors
Monthly PAYE deadlines
If your limited company pays you a director’s salary, PAYE applies.
Key PAYE dates:
- 22nd of each month: PAYE payment deadline (online)
- 19th of each month: If paying by cheque
Real Time Information (RTI)
Payroll submissions must be sent to HMRC on or before each payday, in line with Real Time Information (RTI) requirements. Even if no tax is due, late RTI submissions can still trigger automatic penalties, making timely payroll reporting essential for limited company contractors.
VAT Return and Payment Deadlines
VAT deadlines for limited company contractors
If your company is VAT registered, VAT returns are usually:
- Submitted quarterly
- Due 1 month and 7 days after the VAT period ends
VAT payment date
VAT must be paid by the same deadline as the return submission. Many contractors use the VAT Flat Rate Scheme or standard VAT scheme, both of which require strict deadline management.
Dividend Tax Dates Contractors Should Plan For
When are dividends taxed?
Dividends are taxed in the tax year they are paid, not when profits are earned.
This makes dividend timing critical:
- Dividends paid before 5 April fall into the current tax year
- Dividends paid after 6 April fall into the next tax year
Strategic dividend planning helps contractors:
- Stay within dividend allowance
- Avoid higher-rate tax
- Smooth personal cash flow
Why Missing Tax Dates Costs Contractors More
Failing to meet HMRC deadlines can result in:
- Fixed penalties starting at £100
- Daily fines for continued delays
- Interest on late payments
- HMRC compliance checks
For contractors with irregular contract income, late penalties can quickly outweigh the tax owed.
How Nexus Accounting Helps Contractors Stay Compliant
Nexus Accounting specialises in limited company contractor accounting, providing a fully managed and proactive service designed to keep contractors compliant at every stage of the tax year.
Our support includes proactive deadline reminders, full tax calendar management, strategic dividend and salary planning, and corporation tax optimisation to ensure your contract income is structured in the most tax-efficient way possible.
We work with contractors and freelancers across the UK, making sure every key tax date is met accurately and on time, without unnecessary stress. Learn more about our contractor accounting services or contact us today.
Key Takeaways for Tax for Contractors UK
- The UK tax year runs from 6 April to 5 April
- Corporation tax is due 9 months and 1 day after year-end
- Self Assessment tax returns are due by 31 January
- VAT deadlines are quarterly and strict
- Dividend timing can significantly reduce tax
- Limited company contractors have different rules than the self-employed
Stay Ahead of Tax Deadlines with Nexus Accounting
Staying on top of key tax dates is essential for contractors and freelancers operating through limited companies. From understanding when the tax year starts and ends to managing corporation tax, VAT, and dividend planning, proactive compliance saves time, money, and stress.
Nexus Accounting specialises exclusively in contractor and freelancer accounting for limited companies, providing expert guidance and hands-on support year-round. If you want peace of mind and a tax strategy built around your contract income, explore our accounting services or get in touch today.
