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

182 results for “CT600”Clear search
20 February 2026

Corporation Tax for Property Companies: A Complete Landlord Guide

Corporation tax for property companies. Mortgage interest relief, capital gains, allowable expenses, and filing your CT600.

corporation taxproperty companybuy to letlandlordCT600
20 February 2026

CT600 Filing Checklist — Everything You Need Before You Start

Complete checklist of every document, figure, and detail you need to file your Corporation Tax return. Print it, tick it off, file in 15 minutes.

CT600checklistcorporation taxfilingdocumentspreparation
20 February 2026

Closing a Limited Company — Your Final CT600 and What to Do

Step-by-step guide to closing your limited company. Final CT600, capital distributions, strike-off vs MVL, and the mistakes that cost directors money.

closing companyfinal CT600strike offMVLcorporation taxlimited company
20 February 2026

Best CT600 Filing Software UK 2026 — Compared

HMRC's free filing tool closes March 2026. Compare the best CT600 filing software options — prices, features, and which one suits your company.

CT600filing softwarecomparisonHMRCcorporation tax2026alternatives
20 February 2026

Associated Companies — How They Affect Your Corporation Tax Rate

How associated companies change your Corporation Tax thresholds. What counts, what doesn't, dormant company exemption, and how to report them on your CT600.

associated companiescorporation taxthresholdsmarginal reliefCT600tax rate
20 February 2026

How to File Your CT600 Without an Accountant — Complete Guide

Step-by-step guide to filing your CT600 without an accountant. What you need, how to calculate tax, and how to avoid mistakes.

CT600self-filingcorporation taxno accountantDIY tax returnsave money
19 February 2026

Annual Investment Allowance (AIA): Claim Up to £1 Million in Tax Relief

How to claim AIA on your CT600 for plant and machinery purchases. What qualifies, what doesn't, and common mistakes that cost small companies money.

capital allowancesAIAplant and machineryCT600tax reliefcorporation taxfull expensing
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.

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