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Plain-English guides to UK Corporation Tax and CT600 filing.

4 results for “year end”Clear search
23 February 2026

Company Year End: 31 March vs Other Dates — How It Affects Your CT600

Does your company year end matter for corporation tax? Yes. Here's how 31 March simplifies your CT600 filing, and what happens with other year-end dates.

ct600year-endaccounting-periodcorporation-taxfinancial-year
23 February 2026

Changing Your Company Year End: CT600 & Tax Implications

How changing your accounting reference date affects your CT600 filing. Short periods, HMRC notification, and tax planning opportunities.

ct600year-endaccounting-periodcorporation-tax
21 February 2026

What Happens If Your Accounting Period Is Longer Than 12 Months?

HMRC splits accounting periods over 12 months into two, requiring two CT600 returns. Learn how to calculate tax for each period.

accounting periodCT600corporation taxHMRCyear endnew company
21 February 2026

Corporation Tax Year-End Planning: 12 Tips

Reduce your corporation tax bill before year end. 12 practical planning tips for UK limited companies — from pension contributions to capital allowances and loss relief.

corporation taxyear-end planningtax planninglimited companyallowable expensescapital allowancespension contributions