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Timeline to file iXBRL account with CT600

By when should you submit financial statements in IXBRL format along with CT600 and what is the penalty for delay

Every business entity that is required to file their company tax returns must prepare, at the end of its financial year:

  • full statutory annual accounts
  • a Company Tax Return

Please bear in mind that you still need to file your company tax returns even if your company has made a loss, or if you have no Corporation Tax to pay.

You have different deadlines for sending your accounts to Companies House and your tax return to HMRC, but you may be able send them at the same time. If your company is small, a micro entity or dormant, you might be able to send simpler (‘abridged’) accounts.

You need your accounts and tax return to meet deadlines for filing with Companies House and HM Revenue and Customs (HMRC).

The table below sets out the deadline for different filings :

Action Deadline
File first accounts with Companies House 21 months after the date you registered with Companies House
File annual accounts with Companies House 9 months after your company’s financial year ends
Pay Corporation Tax or tell HMRC that your limited company does not owe any 9 months and 1 day after your ‘accounting period’ for Corporation Tax ends
File a Company Tax Return 12 months after your accounting period for Corporation Tax ends

Your accounting period for Corporation Tax is the time covered by your Company Tax Return. It is normally the same 12 months as the company financial year covered by your annual accounts.

Filing your accounts and tax return

You can file with Companies House and HMRC together or separately. Additional steps are required

  • at the end of your company’s first year
  • if you restart a dormant company

What is the penalty for late filing of company tax return

The table below sets out the penalty applicable for late filing of corporation tax :

Late By Applicable Penalty
One day £100
three months additional £100
six months HMRC will calculate the corporation tax due and will add a penalty of 10 percent of the unpaid corporation tax
twelve months additional 10% of the unpaid corporation tax


Read Next :

All about HMRC iXBRL filing requirements | How to prepare iXBRL accounts?

How To Prepare iXBRL and File CT600

Simple 4-step process to convert your annual financial statements to iXBRL and file company tax returns with HMRC.

1. Sign In

to create your account online and manage iXBRL files

2. Pay and Upload

necessary documents in Excel, Word or PDF format

3. Download

iXBRL package when ready within required turnaround time

4. Submit

CT600 with iXBRL to HMRC. We assist you in filing.



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