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

23 February 2026

How to File a CT600 for a Dormant Company (Step-by-Step)

Complete guide to filing a dormant company CT600. Even if your company did nothing, you still need to file. Here's exactly how.

ct600dormant-companyhmrcguide
23 February 2026

What Happens If You Miss Your CT600 Filing Deadline?

Late CT600 filing penalties explained: £100 at 1 day late, £200 at 3 months, plus interest and tax-geared penalties. How to avoid them.

ct600penaltiesdeadlinehmrc
23 February 2026

HMRC Free CT600 Filing Is Ending March 2026 — What You Need to Do Now

HMRC is closing its free Corporation Tax filing service on 31 March 2026. Here's what this means for your company and the cheapest alternatives.

hmrcct600filingdeadline2026
23 February 2026

Corporation Tax Rates 2025/26: Complete UK Guide

All UK Corporation Tax rates for 2025/26 including small profits rate, main rate, marginal relief, and associated company rules. With worked examples.

corporation-taxtax-rates2025-26marginal-relief
23 February 2026

What Is iXBRL and Why Does Your CT600 Need It?

Plain English explanation of iXBRL — the tagged format HMRC requires for CT600 accounts and tax computations. What it is, why it matters, and how to create it.

ixbrlct600hmrcaccounts
23 February 2026

HMRC Free Filing Software Is Closing March 2026 — What Now?

HMRC is shutting down its free CT600 filing service on 31 March 2026. Here's what it means for your company and the cheapest alternatives.

hmrcct600free-filingmarch-2026
23 February 2026

Year-End Tax Planning: 7 Ways to Reduce Your Corporation Tax Before Filing

Legitimate strategies to reduce your Corporation Tax bill before your year-end. Pension contributions, capital allowances, salary timing, and more.

corporation-taxtax-planningyear-endsmall-business
23 February 2026

Sole Trader vs Limited Company Tax: Which Saves You More in 2025/26?

Complete tax comparison between sole trader and limited company structures. Income tax vs corporation tax, national insurance, dividends, and the crossover point.

corporation-taxsole-traderlimited-companytax-planning
23 February 2026

10 CT600 Mistakes That Get Your Return Rejected by HMRC

The most common CT600 filing mistakes that cause HMRC rejections. Learn what to avoid so your Corporation Tax return gets accepted first time.

ct600hmrcmistakesfiling-tips
23 February 2026

Sole Trader vs Limited Company: Tax Comparison 2025/26

Detailed tax comparison between operating as a sole trader vs limited company in 2025/26. Income Tax vs Corporation Tax, National Insurance, dividends, and when to incorporate.

corporation-taxsole-traderlimited-companytax-comparisonincorporation
23 February 2026

HMRC Government Gateway for Corporation Tax: Setup & Navigation Guide

Step-by-step guide to setting up and using HMRC Government Gateway for Corporation Tax. How to register, enrol for CT, view your account, and manage your tax.

hmrcgovernment-gatewaycorporation-taxguide
23 February 2026

R&D Tax Credits for Small Companies: Save Up to 27% on Innovation Costs

How SME R&D tax relief works for small companies. Qualifying activities, how to calculate the benefit, and reporting on your CT600.

ct600r-and-dtax-creditscorporation-taxinnovation
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