Services

Corporation tax

Corporation tax is the tax a limited company pays on its taxable profits. eba prepares the computation and the CT600 return from your statutory accounts, files both with HMRC, and tells you what to pay and when, well before the money is due. Corporation tax is included in the Core package, which starts at £300 per month plus VAT, and in Insights and Partner above it.

Included in Core, from £300 per month plus VAT


What is included

The return is the visible part. Most of the value is in the work that decides what goes on it.

  • The corporation tax computation

    Built from the finished statutory accounts, adjusting the accounting profit for the items tax law treats differently: depreciation, entertaining, legal fees on capital items, provisions and accrued but unpaid remuneration.

  • The CT600 return, filed with HMRC

    Filed online with the accounts and computation attached in iXBRL, which is the format HMRC requires. You approve it before it goes.

  • Capital allowances claimed properly

    Equipment, vehicles, fixtures in a building you own and integral features all fall into different pools with different treatment. We put each item where it belongs rather than where it is easiest.

  • Losses used in the right place

    A trading loss can be carried back, carried forward or surrendered within a group. The right answer depends on your other years and other companies, and it is a decision worth making deliberately.

  • Associated companies reviewed

    How many companies you control affects the rate bands and the instalment rules. Directors often have more associated companies than they realise, including dormant ones and companies their spouse controls.

  • Reliefs flagged before the year end

    Research and development relief, the patent box, creative sector reliefs and share scheme deductions. We tell you if you look eligible and bring in a specialist where the claim needs one.

  • Payment dates and figures in advance

    You get the tax figure and the date it is due as soon as the draft accounts exist, which is normally several months before the money leaves the account.

  • HMRC correspondence handled

    We are your agent. Letters, information notices and enquiries come to us, and we deal with them rather than forwarding them to you with a question mark.


Who this is for

Every UK limited company that trades has to file a corporation tax return, even in a loss making year. What differs is how much thought the numbers deserve.

  • Profitable owner managed companies

    Where the tax bill is real money and the split between salary, dividends, pension and retained profit is worth planning across the whole year rather than deciding in month twelve.

  • Companies investing in equipment or property

    Capital allowances are where most of the avoidable overpayment sits. A fit out, a new machine or a commercial building purchase all deserve a proper claim.

  • Groups and multi company structures

    A holding company, a trading company and a property company between them create group relief, associated company and transfer questions that a single company never faces.

  • Companies with a loss or a bad year

    A loss is an asset if it is used well. Deciding where to put it is a better use of an hour than almost anything else in the return.

We do not sell marketed tax schemes, and we will not put a claim on a return that we would not be comfortable defending. If a plan only works because HMRC does not look at it, it is not a plan.


How it works

Corporation tax work runs on the same timetable as the annual accounts, because the two are the same exercise viewed twice.

  1. 01

    Before the year end

    For Insights and Partner clients we review the position while there is still time to change it: capital purchases, pension contributions, bonus timing and dividend planning all have to happen before the year closes.

  2. 02

    Accounts finalised

    The computation starts from finished statutory accounts. Preparing the two together is what keeps the return consistent with the numbers on the public record.

  3. 03

    Computation and review

    We prepare the computation, apply the allowances and reliefs, and a second person reviews it. Every return at eba is reviewed by someone who did not prepare it.

  4. 04

    Your figure, in advance

    You get the liability, the payment date and a short explanation of why it is what it is. If it is bigger than expected, you hear it from us early rather than late.

  5. 05

    Approval and filing

    You approve, we file the CT600 with the accounts and computation attached, and you get confirmation from HMRC the same day.

  6. 06

    Payment and follow up

    We remind you before the payment date, confirm HMRC has allocated it correctly, and deal with anything that comes back.


What it costs

Corporation tax is part of the monthly fee, not a separate bill at the year end.

The corporation tax return and computation are included in Core, which starts at £300 per month plus VAT and is billed monthly by Direct Debit. Insights and Partner include everything in Core, so the return is covered in those as well.

Planning work that goes beyond the return sits in eba Plus. A share reorganisation, a group restructure, an HMRC clearance application or a research and development claim are each scoped and quoted as an eba Plus Select engagement before anything starts.

If HMRC opens an enquiry into a return we prepared, we will tell you at the outset what dealing with it is likely to cost. Enquiry work is charged on time because nobody can honestly fix a price for something HMRC controls the length of.


Questions about corporation tax

When do I have to pay corporation tax?

Nine months and one day after the end of your accounting period, for most owner managed companies. If your year ends on 31 March, the tax is due on 1 January. That is three months before the return itself has to be filed, which is why we calculate the liability from the draft accounts and give you the figure early. Larger companies pay in quarterly instalments instead, some of them starting before the accounting period has even ended.

Can I reduce my corporation tax bill legitimately?

Yes, and most of it is timing rather than cleverness. Employer pension contributions, capital purchases, bonuses actually paid within nine months of the year end, and claiming the right capital allowances on a property fit out all reduce the bill and are exactly what the legislation intends. Research and development relief is worth checking if you are solving genuine technical problems. What does not work is anything that depends on HMRC not looking at it, and we do not offer that.

What happens if I cannot pay the corporation tax on time?

Tell us before the due date, not after. HMRC will often agree a Time to Pay arrangement spreading the liability over several months, and the conversation goes considerably better when the return is filed, the request is made early and you can show how the instalments will be met. Interest still runs on the outstanding amount. What causes real damage is silence: HMRC has become markedly less patient with companies that ignore the debt and then ask.

Do I still file a return if the company made a loss or did not trade?

If HMRC has issued a notice to file, yes, you must file a return whether or not there is any tax to pay. A loss making year is worth filing carefully rather than quickly, because the return is where you decide what happens to the loss: carried back against last year, carried forward, or surrendered to another company in the group. A genuinely dormant company can ask HMRC to treat it as dormant, but you still have Companies House obligations.

How does corporation tax interact with what I take out of the company?

Directly, and in both directions. Salary and employer pension contributions reduce the company's taxable profit. Dividends do not, because they are paid out of profit that has already been taxed. So the right mix depends on the company's tax position, your own personal tax position and what the company needs to retain. This is why we prepare the company return and the director's personal return together rather than treating them as two unrelated jobs.

All frequently asked questions


The deadlines that apply

Corporation tax has the unusual feature that the money is due before the paperwork. Everything below runs from the end of your accounting period.

Within three months of starting to trade
A new company must tell HMRC that it is within the charge to corporation tax, if HMRC has not already issued a notice to file.
Nine months and one day after the period end
Corporation tax is payable for a company that is not large enough to pay by instalments. This is three months before the return itself is due.
Twelve months after the period end
The CT600 return, accounts and computation must be filed with HMRC. Filing late triggers a penalty immediately and a larger one after three months.
Quarterly, for large companies
Companies above the size limits pay in instalments during and after the accounting period rather than in a single payment. We tell you before you cross into it.
Twelve months after the filing deadline
The window to amend a return you have already filed. After that, corrections have to be made by other means.
Twelve months from the date you filed
HMRC's normal window to open an enquiry into the return. Filing late extends it, which is another reason not to.

Interest runs on corporation tax paid after the due date, and it runs from the due date, not from the date HMRC notices. Paying an estimate on time and correcting it later usually costs less than paying the exact figure late.


Want corporation tax handled properly?

Tell us about the business and we will say honestly what you need, what it costs and whether a cheaper answer would do the job.