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

19 February 2026

Dividends vs Salary: The Tax-Efficient Way to Pay Yourself

How to optimise your salary and dividends mix as a limited company director. Save thousands in tax with the right strategy — and how it affects your CT600.

corporation taxdividendssalarytax planninglimited companyCT600NIPAYE
19 February 2026

What Happens If You Don't File Corporation Tax? Penalties, Interest, and How to Fix It

Missed your CT600 deadline? Learn about HMRC penalties (£100 to 10% surcharges), interest charges, how to appeal, and the fastest way to get back on track.

CT600penaltieslate filingHMRCcorporation taxdeadlines
19 February 2026

Corporation Tax for Contractors: IR35 and Your CT600

How IR35 affects your Corporation Tax return. Inside vs outside IR35, deemed payments, and guidance for contractor companies.

CT600IR35contractorscorporation taxoff-payroll workingdeemed payment
19 February 2026

R&D Tax Relief for Small Companies: What to Claim on Your CT600

R&D tax credits for SMEs: what qualifies, how to calculate the relief, and which CT600 boxes to complete. Plain English guide.

19 February 2026

Corporation Tax Losses: How to Carry Forward and Carry Back Losses

How to use trading losses on your CT600 return. Carry forward, carry back, group relief, and which CT600 boxes to complete for loss relief claims.

19 February 2026

How to Register for Corporation Tax: Step-by-Step Guide for New Companies

Complete guide to registering your limited company for corporation tax with HMRC. Deadlines, what you need, UTR numbers, and what happens after registration.

19 February 2026

How to Amend a CT600 — Correcting Mistakes on Your Corporation Tax Return

Filed your CT600 and spotted an error? Here's how to amend your Corporation Tax return, the time limits, and what happens if HMRC finds the mistake first.

CT600amendmentscorporation taxHMRCmistakes
19 February 2026

Your First Company Tax Return — A New Director's Guide to CT600 Filing

Just set up a limited company? Everything you need to know about your first CT600 — when it is due, what to include, and how to file.

ct600new companyfirst tax returncorporation taxbeginners
19 February 2026

Accounting Periods Explained — When Does Your Corporation Tax Year Start and End?

What is an accounting period for Corporation Tax? How to work out your dates, what happens in your first year, and how periods affect your CT600 deadlines.

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19 February 2026

Corporation Tax Allowable Expenses — The Complete List for Small Companies

Complete list of expenses your limited company can claim against Corporation Tax — from office costs to travel, with real examples.

corporation taxallowable expensestax deductionssmall business
19 February 2026

Capital Allowances for Small Companies — AIA, Full Expensing & Cars

How to claim capital allowances on your CT600. AIA, full expensing, car rules, and writing down allowances for small companies.

capital allowancesAIAcorporation taxct600tax deductions
19 February 2026

Dormant Company CT600 Filing: Do You Still Need to File? (Yes — Here's How)

Your dormant company still needs to file a CT600 with HMRC. Learn what counts as dormant, how to file, and the fastest way to stay compliant for just £59.

dormant companyCT600corporation taxHMRCfilingcompliance
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