Telling hmrc that you have no corporation tax to pay

So your company has made a profit, but after all the allowances and reliefs, your corporation tax bill comes to nil. What happens next? Do you still need to tell HMRC? The short answer is: yes, in most cases you do—but it’s straightforward once you understand the rules.

As a Worcester-based firm, we help clients navigate this situation regularly. Whether you’re a small limited company, a partnership, or a sole trader who’s incorporated, knowing how to correctly report nil corporation tax can save you time, stress, and potential compliance issues down the line.

Understanding Nil Corporation Tax Returns

First, let’s clarify what we mean by “nil corporation tax.” This isn’t the same as not making a profit. You might have made £50,000 in turnover but, after deducting business expenses, allowances, and reliefs, your taxable profit is zero or very close to it. In this scenario, you owe no corporation tax—but you almost certainly still need to file a return.

Under current HMRC rules, most limited companies and associations must file a Corporation Tax Return (CT600) within nine months of their accounting period end, regardless of whether they owe tax. There are very limited exemptions. Small profits relief doesn’t apply in 2024/25, and the corporation tax rate remains 19% for most companies with profits under £50,000, with the main rate of 25% applying to larger profits.

When You Must File a Nil Return

Your company is required to submit a Corporation Tax Return if:

• You’re a limited company or other corporate entity required to prepare accounts
• You’ve run a trading or professional business during the accounting period
• Your company has received any untaxed income (interest, dividends, rental income, etc.)
• You’re part of a group with other trading entities
• You hold any land or property

Even if you made a loss or had nil taxable profits after reliefs, HMRC still wants to see the return. Not filing when you’re required to do so can attract penalties: currently starting at £100 for the first three months of non-filing and increasing thereafter.

How to File Your Nil Return

The process is relatively simple. You’ll need to:

1. Prepare your accounts – Complete your financial statements in line with Companies House requirements and UK accounting standards.

2. Calculate your taxable position – Work out your profit or loss for tax purposes, applying any reliefs available (capital allowances, loss relief, trading allowance if relevant, etc.).

3. Complete your CT600 – File this online through HMRC’s online services portal. You’ll declare your turnover, expenses, and taxable profit/loss. If the figure is nil or negative, state that clearly.

4. Include supporting information – Attach your accounts, tax computations, and any supporting schedules requested by HMRC.

5. Submit on time – File within nine months of your year-end to avoid penalties. Many accountants file earlier for peace of mind.

You cannot simply ignore the requirement because you owe no tax. HMRC’s compliance checks are increasingly automated; a missing return will flag on their systems.

What Happens After You File

Once HMRC receives your nil return, they’ll process it and issue a notice of assessment confirming that no tax is due. This is important documentation—keep it safe. You won’t need to make a payment, but you should retain all supporting documentation (receipts, invoices, payroll records, etc.) for at least six years, as HMRC may still carry out compliance checks even on nil returns.

If you’ve claimed any significant reliefs—such as research and development relief or qualifying charitable donations—HMRC may request supporting evidence. Having detailed records and clear calculations ready makes this straightforward.

Avoiding Common Mistakes

Don’t assume no profit means no filing requirement. Don’t forget to declare all income sources, even if your net position is nil. And don’t miss the nine-month deadline hoping HMRC won’t notice—they will, and the penalties aren’t worth it.

If your company is dormant (genuinely inactive with no transactions), different rules may apply, but you’ll still typically need to file confirmation of dormancy rather than simply going silent.

Final Thoughts

Filing a nil corporation tax return is a routine part of running a limited company in the UK. It’s a compliance requirement that protects you and keeps your records in order with HMRC. Whether your nil position results from careful tax planning or simply the nature of your business that year, the reporting obligation remains the same.

If you’re unsure whether your company needs to file, what reliefs you can claim, or how to structure your accounts to minimise tax whilst staying compliant, it’s worth seeking professional guidance.

For tailored advice, contact Severn Accounting — we’re here to help.