Corporation Tax Late Payment Penalties: Costs & How to Appeal

Corporation Tax late payment penalties include interest charges on the amount you owe and, in some cases, additional penalties if you fail to meet your filing obligations. 

Whether you paid late because of cash flow problems, an admin error, or exceptional circumstances, acting quickly can reduce the amount you owe.

This guide explains what happens when you miss a Corporation Tax payment deadline, how much it could cost, and when you may be able to appeal.

Key points

• Payment and filing deadlines are separate 📅
  Paying Corporation Tax late and filing your Company Tax Return late are treated as different issues. Missing these deadlines can result in interest charges and late filing penalties.
• You may be able to appeal a penalty 📝
  If you had a reasonable excuse for being late or believe HMRC made a mistake, you can usually appeal within 30 days of receiving the penalty notice. Include supporting evidence to strengthen your case.
• Contact HMRC if you can't pay 🤝
  If your business is struggling financially, contact HMRC before the debt grows. You may be able to spread your tax bill through a Time to Pay arrangement.
• ANNA helps you stay ahead of Corporation Tax deadlines 🚀
  ANNA keeps your bookkeeping organised, estimates your Corporation Tax throughout the year, and helps you file your Company Tax Return, making it easier to stay compliant and avoid penalties.

What happens if you pay Corporation Tax late?

If you don't pay Corporation Tax by the deadline, HMRC starts charging late payment interest from the day after the payment was due until you pay the outstanding balance in full.

Unlike with penalties for Corporation Tax returns, there isn't a fixed penalty for paying your Corporation Tax late. Instead, the longer the payment remains outstanding, the more interest you'll pay.

If the debt remains unpaid for more than a month, HMRC may begin debt collection action. This could include contacting your business, arranging a payment plan, or taking legal action to recover the money.

When is Corporation Tax due?

For most limited companies, Corporation Tax is due nine months and one day after the end of the accounting period.

For example, if your accounting period ended on 31 March 2026, you'll need to pay your Corporation Tax by 1 January 2027.

Your Corporation Tax return has a different deadline. You'll usually need to file it within 12 months of the end of your accounting period.

HMRC treats late Corporation Tax payments and late Company Tax Returns separately, so you could face both interest on late payments and penalties for filing your return late.

How Corporation Tax late payment penalties work

If you pay Corporation Tax after the deadline, HMRC charges late payment interest on the outstanding balance.

The interest rate changes over time because it's linked to the Bank of England base rate, so the amount you pay depends on:

• How much Corporation Tax you owe
• How many days late the payment is
• What interest rate applies during that period

Interest continues to stack until you've paid the full amount.

Making a partial payment is better than waiting to pay in full, as it immediately reduces the amount of interest building up against your balance 

What if you can't pay your Corporation Tax?

If your business can't afford to pay Corporation Tax on time, contact HMRC as soon as possible. In some cases, you may be able to arrange a Time to Pay agreement.

A Time to Pay arrangement lets you spread your tax bill over an agreed period through regular instalments. 

When considering your request, HMRC may look at:

• Why you can't pay on time
• Whether your business is otherwise up to date with its tax obligations
• How much you owe
• Whether you can realistically keep up with the proposed repayments

A Time to Pay arrangement won't stop the interest, but it will protect you from further enforcement action.

Corporation Tax late filing penalties

Late payment interest is separate from penalties for filing your Company Tax Return after the deadline.

For a company that files late, the penalties are:

If your company files late three accounting periods in a row, the initial fixed penalty increases from £200 to £1,000.

Even if you can't pay immediately, filing your return on time helps you avoid additional penalties.

Appealing a Corporation Tax penalty

You can usually appeal a Corporation Tax penalty if you believe HMRC made a mistake or you had a reasonable excuse for missing the deadline.

You'll normally need to appeal within 30 days of the date on the penalty notice.

You can appeal:

• Online through your HMRC account
• By post 
• Using the appeal form included with the penalty notice

Regardless of how you apply, you need to include:

• Your company name and Unique Taxpayer Reference (UTR)
• The penalty notice reference
• The date you received the penalty
• A clear explanation of why you missed the deadline
• Copies of any evidence supporting your claim

Providing complete information the first time can help HMRC process your appeal more quickly.

What counts as a reasonable excuse?

HMRC may accept the following as reasonable excuses:

• A serious illness that prevented you from dealing with your tax affairs
• The death of a close family member shortly before the deadline
• An unexpected IT failure that prevented you from filing or paying
• A major fire or flood affecting your business records
• Postal delays outside your control

🧠 Good to know: 

Even if HMRC rejects your appeal, you may still be able to ask for an internal review or appeal the decision to an independent tax tribunal.

What happens after you pay late?

Paying your outstanding Corporation Tax won't cancel any interest that has already built up. HMRC charges interest daily for each day the tax remains unpaid, and that charge continues until your payment reaches them. So if there's a gap between when you calculate your bill and when you pay it, the total will have grown in the meantime. 

Once you've paid everything you owe, including any interest or penalties, HMRC will update your company's tax account to show that your balance has been cleared. 

How to avoid Corporation Tax penalties

The easiest way to avoid penalties is to stay ahead of your deadlines throughout the year.

Here are some practical ways to reduce the risk:

• Keep accurate bookkeeping records throughout the year
• Set reminders for both your Corporation Tax payment and filing deadlines
• Estimate your Corporation Tax bill before your accounting period ends
• Set money aside regularly for your future tax bill
• Contact HMRC as soon as possible if you think you'll struggle to pay

💡 Did you know? 

ANNA can help you file your Company Tax Return while automatically organising your bookkeeping, estimating your tax, and keeping your financial records up to date throughout the year. 

With everything in one place, it's easier to stay on top of HMRC deadlines and avoid penalties. 

Can HMRC take further action?

If you leave your Corporation Tax unpaid and don't engage with HMRC, the department has several options to recover the debt.

Depending on the circumstances, HMRC may:

• Contact your business to request payment
• Use debt collection agencies
• Begin legal proceedings
• Recover the debt through the courts

Taking action early and communicating with HMRC is usually the best way to prevent the situation from escalating.

How ANNA helps you avoid Corporation Tax penalties

Avoiding Corporation Tax penalties starts long before the payment deadline. Keeping accurate records, knowing how much tax your company is likely to owe, and filing your Company Tax Return on time all make it easier to stay compliant. 

ANNA helps by handling most of your admin throughout the year.

Here’s how:

• Real-time Corporation Tax estimates: See how much Corporation Tax your company may owe as your income and expenses change, making it simpler to budget for your next tax bill
• Business account: Open a UK business account in minutes, with a debit card, instant transaction notifications, and all your financial admin in one place 
• Automatic bookkeeping: Have your business transactions categorised automatically, keep your financial records accurate, and reduce manual admin
• Receipt capture: Store receipts and supporting documents digitally, so they're ready when you prepare your Company Tax Return or need evidence for HMRC
• Company Tax Return filing support: Prepare and file your Company Tax Return with organised financial records, so you can meet HMRC deadlines with less last-minute work
• Smart money pots: Set money aside for future Corporation Tax payments throughout the year, reducing the risk of cash flow problems when your bill is due
• 24/7, human tax support: Get help from ANNA's tax experts if you have questions about Corporation Tax, filing deadlines, or your tax obligations

Sign up with ANNA today to stay on top of Corporation Tax