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Find out when you can expect to receive a reply from HMRC to a query or request you've made.
Find and use tools and calculators that will help you work out your tax.
Find out how to get a certificate of residence as an individual, company or organisation so you do not get taxed twice on foreign income.
You can reduce your Corporation Tax bill through Marginal Relief from 1 April 2023 if your company’s profits are lower than £250,000.
What detailed information you need to send to HMRC to support your Research and Development (R&D) tax relief claim, and when and how to submit it.
Find out if you can claim Corporation Tax relief on your Research and Development (R&D) project.
How to work out payments and when you should make them if your company’s annual taxable profits are between £1.5 million and £20 million.
Find recognised suppliers and software for Corporation Tax returns and supplementary pages.
How to claim Corporation Tax relief for costs on R&D if you're a small and medium-sized enterprise (SME).
How to complete your CT600 Company Tax Return form for Corporation Tax and what information you need to include.
Find out about being 'active', trading and non-trading, and being dormant if you’re a new or existing company or organisation.
How to work out and claim Corporation Tax relief on trading losses.
If you're a close company or a tax agent, find out how to claim relief for loans that have been repaid, released, or written off.
Check when you need to notify HMRC in advance about an R&D Corporation Tax relief claim, the information you will need to provide and how to send it.
Find out if you can use the free online filing service to file your Company Tax Return with HMRC and accounts with Companies House.
How to claim R&D expenditure credit (RDEC) for Corporation Tax relief on your company's R&D, if you’re a large company or small and medium-sized enterprise.
Rates, allowances and limits for Corporation Tax.
Find out about the type of losses your company can offset against profits in future accounting periods.
Guidance for companies to work out and claim relief from Corporation Tax on terminal losses, capital losses and property income losses.
Check if your company’s or group’s interest deductions for Corporation Tax will be restricted, and if you need to send a Corporate Interest Restriction return.
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