Year-end accounts filed with Companies House and CT600 returns to HMRC — backed by qualified accountants and real-time AI insights that surface tax savings before year-end, not after.
Most UK limited companies discover their Corporation Tax bill weeks before it’s due. By then, the opportunities to plan it down are gone. AccTek’s approach is the opposite: your CT liability is modelled in real time through the AI Finance Lab, your year-end accounts are drafted as the year progresses, and tax planning is built into the relationship — not bolted on at filing time.
We handle the full year-end cycle — Companies House accounts, HMRC CT600 returns, dividend and salary planning, and director self-assessment — under one roof.
Annual accounts and Corporation Tax aren’t separate jobs. We prepare them together — from the same underlying Xero data — so nothing falls between the cracks.
Statutory accounts prepared to FRS 102 or FRS 105, depending on your company’s size, and filed with Companies House on time.
Full Corporation Tax computation and CT600 return prepared, reviewed and filed with HMRC. With tax planning embedded throughout the year.
The rate your company pays depends on its taxable profit. Marginal relief applies in the middle band — getting it right matters.
| Profit band | Rate | How it applies |
|---|---|---|
| Up to £50,000 | 19% | Small profits rate |
| £50,001 – £250,000 | ~26.5% effective | Main rate with marginal relief |
| Over £250,000 | 25% | Main rate |
Thresholds are reduced proportionally for accounting periods under 12 months and divided across “associated companies” in the same control group. AccTek handles the marginal relief calculation, associated-company adjustments and any short-period apportionments as standard.
Your CT liability and profit position are modelled live in the AI Finance Lab as transactions land in Xero.
Three months before year-end, your accountant runs a planning session: dividends, pensions, R&D and capital expenditure.
Accounts and CT600 drafted within four weeks of year-end. You review, ask questions, approve.
We file with Companies House and HMRC, archive the records, and you receive copies for your bank and investors.
9 months after year-endAnnual accounts must be filed with Companies House within nine months of your accounting reference date.
12 months after year-endCorporation Tax return (CT600) must be filed with HMRC within twelve months of the end of your accounting period.
9 months & 1 day after year-endCorporation Tax payment is due before the return is filed — an unusual quirk you should not miss.
Get an instant quote in under two minutes, or book a free consultation. We’ll review your last accounts and show you what proactive tax planning could save.
Official guidance
For the latest HMRC and Companies House guidance, see Prepare and file annual accounts and Corporation Tax. AccTek Ltd is an independent accountancy firm and is not affiliated with HMRC or GOV.UK.
AccTek is a member firm of the Institute of Certified Practising Accountants (ICPA). Our accountants have a wide range of qualifications and accreditations from trusted professional bodies such as the AAT, ICPA, and ACCA.
