Corporation Tax Payment Deadline 2026: Due Dates and How to Spread the Cost

Could your Corporation Tax payment put unnecessary pressure on your working capital? For many UK businesses, the tax deadline arrives at a time when cash is also needed for stock, wages, VAT, recruitment or growth.

Planning ahead can help you meet your obligations without putting your wider growth plans on hold. In this guide, we explain what Corporation Tax is, when it is usually due and how Corporation Tax finance and related funding solutions could help you manage your cash flow more effectively.

What is Corporation Tax?

Corporation Tax is a tax paid by companies and certain other organisations on their taxable profits. Taxable profits can include:

1. Trading profits.
2. Profits from investments.
3. Chargeable gains from selling assets for more than they cost.
4. Other taxable income, depending on the structure and activities of the business.

Most limited companies pay Corporation Tax on their taxable profits. UK branches of overseas companies and certain unincorporated associations may also have Corporation Tax responsibilities.

The amount due depends on your company’s taxable profits, accounting period, allowable expenses, reliefs and applicable tax rules. HMRC does not generally send you a Corporation Tax bill, so your company is responsible for calculating what it owes, submitting its Company Tax Return and making payment on time.

You can read the official HMRC Corporation Tax overview for more information. For advice relating to your own tax position, you should speak to your accountant or tax adviser.

When is Corporation Tax due? Understanding the Corporation Tax payment deadline and due date

Do you know the difference between your Corporation Tax payment deadline and your filing deadline? They are separate dates, and confusing the two can create avoidable problems.

For most companies:

• Corporation Tax is due 9 months and 1 day after the end of your accounting period.
• Your Company Tax Return, commonly submitted using form CT600, is due 12 months after the end of your accounting period.

In other words, the Corporation Tax due date is usually earlier than the company tax return deadline. In a typical case, the Corporation Tax payment deadline falls approximately three months before the Company Tax Return filing deadline.

For example, if your company’s accounting period ends on 31 December 2025, your Corporation Tax payment deadline will usually be 1 October 2026. If your accounting period ends on 31 March 2026, payment will usually be due on 1 January 2027.

These are examples rather than universal deadlines. Your company’s accounting period, associated companies and profit levels can affect the calculation. You should confirm your specific Corporation Tax due date and company tax return deadline with your accountant and check the HMRC guidance on paying Corporation Tax.

What if your company is classed as large?

The standard 9-month-and-1-day rule does not apply in the same way to every company.

Companies with annualised taxable profits above £1.5 million generally pay Corporation Tax by quarterly instalments rather than waiting for one payment after the accounting period ends. These Corporation Tax instalments follow different rules from the standard Corporation Tax payment deadline. The £1.5 million threshold can be affected by factors such as the length of the accounting period and the number of associated companies.

Very large companies may have an earlier instalment timetable. For that reason, businesses approaching or exceeding the threshold should discuss their payment schedule with their accountant well in advance.

Quarterly instalments can make tax payments more regular, but they also mean that cash needs to be set aside throughout the year. Good cash flow management is therefore important for both smaller companies and larger corporate groups.

What happens if Corporation Tax is paid late?

Would a late payment affect more than your immediate cash position? HMRC charges interest when Corporation Tax is paid after its due date. Interest is generally calculated daily on the unpaid amount until the balance is settled.

It is also important to distinguish between late payment and late filing:

• Late payment can result in HMRC interest charges.
• Late filing of the Company Tax Return can result in statutory penalties.
• Companies that miss instalment payments or fail to meet related obligations may face further financial and administrative consequences.

The safest approach is to identify your deadlines early, estimate the amount likely to be due and discuss funding options before the payment date becomes urgent.

What is Corporation Tax finance?

What if your tax bill is due before it feels convenient for your cash flow? Corporation Tax finance is a way of spreading an eligible Corporation Tax bill into fixed monthly instalments rather than paying the full amount in one lump sum.

You may also hear this described as a Corporation Tax loan or a Corporation Tax payment plan. In practical terms, these phrases are commonly used to describe a commercial funding solution that spreads an eligible tax bill into monthly repayments rather than requiring one large payment at the Corporation Tax payment deadline.

The tax liability itself does not change. Your business still owes HMRC the same amount, and interest or other charges may apply to the finance agreement. The purpose of the funding is simply to spread the cost over time, which can make the payment more manageable from a cash flow perspective.

This is a different product from equipment asset finance. Equipment finance is used to fund business assets such as vehicles, IT equipment or machinery. Corporation Tax finance is designed specifically to help a business manage the timing of an eligible tax payment.

HMRC may also offer a Time to Pay arrangement for businesses that cannot pay on time. That is separate from commercial Corporation Tax finance. A commercial facility can spread the cost over 6 or 12 months without needing to agree a payment schedule directly with HMRC, but businesses should speak to their accountant or tax adviser about their own position.

Why might a business choose Corporation Tax finance?

Why pay a large tax bill in one month if spreading it would leave your business in a stronger position? For some businesses, the issue is not whether the tax is due, but how to pay it without putting unnecessary strain on working capital.

There are several reasons why a business might choose Corporation Tax finance.

1. Protecting working capital

A Corporation Tax payment can fall at the same time as wages, rent, supplier payments, VAT, stock purchases and wider growth costs.

By spreading the cost into fixed monthly instalments, your business may be able to preserve more working capital for day-to-day operations and planned investment.

2. Avoiding one large payment landing in a single month

A single lump-sum tax payment can create pressure even in a profitable business.

Spreading the cost can reduce the impact of one significant outgoing hitting your account at once, which may help your business keep more financial flexibility around the deadline.

3. Creating predictable monthly outgoings

Predictable monthly payments can make budgeting easier.

For many businesses, fixed instalments are simpler to plan for than a single large tax payment. This can support clearer budgeting, easier cash flow forecasting and more structured financial planning.

4. Keeping a cash buffer for other commitments

Retaining a cash reserve can be important when trading conditions are uncertain or when multiple payments are due at the same time.

Corporation Tax finance may help your business keep a buffer available for operational costs and unexpected commitments rather than using available cash in one go.

5. Taking immediate pressure off an unexpectedly large bill

Sometimes a Corporation Tax bill is higher than expected because profits were stronger than anticipated or because the business has less available cash at the deadline than originally planned.

In these situations, spreading the cost may help take the immediate pressure off while allowing the business to meet its obligations in a more manageable way.

How can WestWon help?

What if you want to spread an eligible Corporation Tax bill but also want clear guidance on the options available? WestWon arranges Corporation Tax finance for UK businesses through its lender relationships.

The cost of an eligible bill can typically be spread over 6- or 12-month repayments, helping you turn a single tax payment into fixed monthly outgoings. Payment can also be made directly to HMRC, so the bill is settled on time, and approval can be provided within 24 hours in some cases. Using tax finance can also help you avoid using up an existing bank facility, leaving that line of credit available for other business needs.

Deal sizes can range from approximately £1,000 to £1 million and beyond, where supported by the circumstances and the funder involved. We offer a straightforward application process and access to multiple funders rather than relying on a single lender, helping us explore suitable options for different business profiles.

Our Corporation Tax finance service is separate from equipment asset finance. As an FCA-regulated credit broker, WestWon is not a lender. Availability, terms and pricing depend on your circumstances, affordability and lender assessment, and we cannot guarantee acceptance or any particular rate.

VAT funding to help bridge timing gaps

VAT can create a separate timing issue for some businesses, particularly where tax payments and other major outgoings fall close together.

Subject to eligibility, VAT funding may help bridge that gap and reduce pressure on working capital at the same time as a Corporation Tax payment is due. Your accountant can advise on the VAT treatment and timing relevant to your business.

Speed when timing matters

We understand that funding is sometimes needed quickly. WestWon’s fastest transaction progressed from proposal to funds paid out on the same working day.

That does not mean every application will follow the same timetable. However, it reflects our focus on responsive service and practical communication when you are working towards a deadline.

What should you consider before choosing finance?

Is spreading a tax bill always the right answer? Not necessarily. There is no universally correct approach. The most suitable option depends on your budget, cash position, affordability, timing and wider business plans.

Before making a decision, consider:

1. When your Corporation Tax payment deadline falls.
2. Whether the bill can be paid comfortably without affecting day-to-day trading.
3. How much cash your business needs to retain as a safety buffer.
4. The total cost of credit, not just the monthly payment.
5. Whether the monthly repayments are affordable for your business.
6. Any lender requirements, terms or conditions attached to the agreement.
7. Any tax or accounting implications, which should be discussed with your accountant or tax adviser.

Our role is to help you understand the available options clearly, so you can make a decision that fits your business rather than simply choosing the fastest or cheapest-looking payment route.

FAQ: common questions about Corporation Tax deadlines and finance

When is the Corporation Tax payment deadline?

For most companies, the Corporation Tax payment deadline is 9 months and 1 day after the end of the accounting period. The company tax return deadline is usually later, at 12 months after the end of the accounting period.

Can you pay Corporation Tax in instalments?

Some larger companies pay Corporation Tax by quarterly instalments under HMRC rules. Separately, some businesses may use commercial finance to spread an eligible bill into monthly repayments, subject to lender criteria and approval.

What is a Corporation Tax loan?

A Corporation Tax loan is a commonly used term for a commercial funding facility that spreads an eligible Corporation Tax bill over fixed monthly repayments. It does not reduce the tax owed to HMRC; it simply changes how the cost is paid over time, and interest or other charges may apply.

Concluding: plan the deadline and protect your options

Corporation Tax is normally payable 9 months and 1 day after the end of your accounting period, while the company tax return deadline is generally 12 months after the accounting period ends. Larger companies with annualised taxable profits above £1.5 million usually pay by quarterly Corporation Tax instalments.

Late payment can lead to interest, while late filing can trigger penalties. Planning early is therefore essential.

There is no right or wrong answer when it comes to funding a tax bill. The best fit depends on your budget, cash flow and business objectives. Corporation Tax finance can be a practical way to spread the cost of an eligible bill and protect working capital, but it does not reduce the amount of tax owed and interest or other charges may apply.

If you would like to discuss Corporation Tax finance UK options and the funding solutions available, our team is here to help. Contact WestWon on 01494 611 456 or email [email protected]. We will be pleased to understand your requirements and explore a practical funding solution with you. Please speak to your accountant or tax adviser for tax-specific guidance.