CT600 • iXBRL • HMRC online filing

Company Tax Return Services for UK Limited Companies

Filing your company tax return doesn’t have to be stressful. We make the process simple, accurate, and fully compliant with HMRC rules.

Compliant On‑time Optimised UK‑wide
CT600 SummaryReady to submit
Taxable profits£ 128,400
Allowable reliefs appliedYes
CT600 generated (iXBRL)Yes
Submission statusAwaiting approval
Illustrative panel — your actual figures and checks are tailored to your company.

Professional Corporation Tax Return (CT600) Preparation

Our qualified accountants specialise in corporation tax returns for limited companies, ensuring you meet all deadlines, avoid penalties, and only pay the tax your ltd company owes.

Calculate taxable profits

Based on your signed statutory accounts with correct adjustments.

Apply deductions & reliefs

Capital allowances, R&D eligibility checks and more.

Prepare CT600 in iXBRL

Tagged accounts & computations aligned with HMRC standards.

HMRC online submission

Filed securely with acknowledgement and digital records kept.

Payment advice & deadlines

Clear amounts due and key dates so you never miss a deadline.

Deadlines at a glance
12 months
to file your CT600 after the period ends
9m + 1d
to pay corporation tax
We’ll track dates and keep you ahead of HMRC.
Avoid penalties
  • Late filing penalties start at £100 and escalate with delay.
  • Incorrect returns may incur fines and interest on unpaid tax.
  • We review for accuracy before submission.

What we need to get started

Signed statutory accounts
FRS105 or FRS102A set for the period.
Trial balance & computations
Adjustments for tax already prepared or we’ll prepare them.
Reliefs & claims info
Capital allowances, R&D, losses, group reliefs (if any).
Company details
UTR, Reg. number, accounting period dates.
HMRC gateway access
Or we file as your authorised agent.

FAQs – Company Tax Returns in the UK

While the Companies Act mainly governs statutory accounts, those accounts form the basis for your company tax return submitted to HMRC.
Companies House does not receive your corporation tax return, but you must still file your annual accounts there – and these must match the figures in your CT600.
HMRC requires all limited companies to submit a CT600 company tax return and pay corporation tax on their taxable profits. This must be filed online in iXBRL format.
Yes. Late filing penalties start at £100 and increase the longer the delay. Incorrect returns can lead to further fines and interest on unpaid tax.
  • Filing deadline: 12 months after your accounting period ends
  • Payment deadline: 9 months and 1 day after your accounting period ends
Some software can generate a draft return, but most businesses still need a qualified accountant to ensure compliance and accuracy.
Yes – dividends are paid from post‑tax profits, and shareholders may need to pay personal dividend tax depending on their total income.

UK Corporation Tax and Dividends (Reserve Available for Distributions) Estimator

Calculations include Time Apportionment for periods crossing Financial Years (FY).

Disclaimer: This is an estimate only. Always check with your accountant. The tax limits (£50k / £250k) are divided by the number of Associated Companies plus one (the Divisor D). An Associated Company is essentially one that is controlled by the same person(s) or connected parties.

Enter Accounting Period Dates

£

Calculation Results Summary

Taxable Profit

£0

Corporation Tax (CT) Due

£0

Estimated Reserve Available for Dividends

£0

Marginal Relief Amount

£0

Effective Tax Rate

0.00%

Get Help Filing Your Company Tax Return

First time filing or need a second pair of eyes? We’ll handle it end‑to‑end.

Request a free consultation