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

187 results for “corporation tax”Clear search
23 February 2026

Corporation Tax for Landlords: Running a Property Company in 2025/26

Complete guide to Corporation Tax for property investment companies. Buy-to-let through a limited company, allowable expenses, mortgage interest relief, and CT600 filing.

ct600propertylandlordcorporation-taxbuy-to-let
23 February 2026

IR35 & Off-Payroll Rules: How They Affect Your Corporation Tax

How IR35 and off-payroll working rules impact your limited company CT600. Inside vs outside IR35, deemed payments, and tax implications explained.

ct600ir35corporation-taxcontractors
23 February 2026

HMRC Free CT600 Filing Service Closing March 2026: What You Need to Do

HMRC is closing its free Corporation Tax filing service on 31 March 2026. What this means for your company and how to prepare.

hmrcct600deadlinefree-filing2026
23 February 2026

CT600 Filing Deadline Calculator: When Is Your Return Due?

Calculate your CT600 filing deadline and Corporation Tax payment deadline. Different deadlines explained with examples for various accounting periods.

ct600deadlinehmrccorporation-tax
23 February 2026

HMRC Enquiry Into Your Corporation Tax Return: What to Expect

What happens if HMRC opens an enquiry into your CT600. Your rights, the process, time limits, and how to respond.

ct600hmrcenquirycorporation-taxcompliance
23 February 2026

Corporation Tax Rates 2025/26: Small Company Guide (19% vs 25%)

Complete guide to Corporation Tax rates for 2025/26. How the 19% small profits rate and 25% main rate work, marginal relief explained with examples.

corporation-taxtax-ratessmall-businessmarginal-relief2025-26
23 February 2026

How to Pay Corporation Tax: Every Payment Method Explained

All the ways to pay your Corporation Tax to HMRC — bank transfer, direct debit, online, and by post. Processing times and payment references explained.

corporation-taxhmrcpaymentguide
23 February 2026

CT600 Box by Box Guide 2025/26: Every Box Explained

Comprehensive CT600 box-by-box guide for 2025/26. What goes in each box, common mistakes, and worked examples for every section of the Corporation Tax return.

ct600guidehmrccorporation-taxboxes
23 February 2026

Small Company Corporation Tax Rate 2025/26: Everything You Need to Know

The small profits rate, marginal relief band, and how to check which rate applies to your company. Updated for the 2025/26 tax year.

corporation-taxsmall-businesstax-rates2025-26
23 February 2026

Corporation Tax Payment: Deadlines, Methods & What Happens If You're Late

When to pay Corporation Tax, how to pay HMRC, payment reference numbers, and the consequences of late payment. Complete guide for limited companies.

corporation-taxpaymentdeadlineshmrchow-to
23 February 2026

CT600 Tax Calculation Section (Boxes 430-525): How Your Tax Is Computed

Understanding the CT600 tax calculation boxes — Corporation Tax rates, marginal relief, tax payable, and payments on account. Every box explained.

ct600boxestax-calculationcorporation-taxmarginal-relief
23 February 2026

Employer National Insurance & Corporation Tax: What You Can Deduct

How employer NI contributions affect your Corporation Tax bill. What's deductible, Employment Allowance, and reporting on your CT600.

ct600national-insuranceemployercorporation-taxpaye
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