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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.
Find recognised commercial software suppliers and software you can use to file your Company Tax Return and any supplementary pages online.
Find out how to file your accounts and Company Tax Return if you previously used the HMRC online service that closed on 31 March 2026.
You can reduce your Corporation Tax bill through Marginal Relief from 1 April 2023 if your company’s profits are lower than £250,000.
Find out what information you need to send HMRC before you make a claim for R&D Corporation Tax relief.
Find out what R&D tax relief is and if your project qualifies for Corporation Tax relief.
How to complete your CT600 Company Tax Return form for Corporation Tax and what information you need to include.
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.
Check if you need to submit a claim notification form before you claim R&D Corporation Tax relief, what information you’ll need to provide and how to send it.
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.
Find out about being 'active', trading and non-trading, and being dormant if you’re a new or existing company or organisation.
Find out if you can claim under the merged R&D expenditure credit (RDEC) scheme or enhanced R&D intensive support (ERIS) for accounting periods beginning on or after 1 April 2024.
Use the online tool throughout a check to guide you through each stage and to access the support available.
How to work out and claim Corporation Tax relief on trading losses.
Find out about Corporation Tax relief you can claim for costs on R&D if you’re a small and medium-sized enterprise with an accounting period that starts before 1 April 2024.
Ask HMRC for assurance on particular areas of your Research and Development (R&D) tax relief claim, if you’re a small or medium-sized enterprise (SME).
Find out which costs qualify for R&D Corporation Tax relief, if you want to claim for your project on your Company Tax Return.
Check the availability and any issues affecting the Corporation Tax online service.
Do not include personal or financial information like your National Insurance number or credit card details.
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