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Use the Check Employment Status for Tax (CEST) tool to find out if you, or a worker on a specific engagement, should be classed as employed or self-employed for tax purposes.
Find and use tools and calculators that will help you work out your tax.
Off-payroll working rules for clients, workers (contractors) and their intermediaries.
Get help with Self Assessment by using online tools and helpsheets, watching YouTube videos or asking the digital assistant or community forums a question.
Rates, allowances and limits for National Insurance.
Find software suppliers for tax returns, supplementary pages and attachments.
Register a new partnership for Self Assessment using form SA400.
Supplementary guidance on how to check tax calculations or work out the trading profits of a business for Self Assessment tax return.
Find out which mortgage providers and lenders accept printed tax summaries.
Find out if you could claim the cost of training as an allowable business expense if you are a self-employed individual.
Learn more about your responsibilities if you're running a small business including registration, tax returns, record keeping, tax bills and payments.
When to apply the off-payroll working rules (IR35) if you receive services from a worker through their intermediary.
Check how much you were paid for SEISS and how to repay an overpaid grant.
Find information on completing the Capital Gains section of your Self Assessment tax return.
How to comply with the reformed off-payroll working rules (IR35), and avoid common mistakes.
How Income Tax and National Insurance contributions rules work if you’re a share fisher.
Find out what to do if you need to pay back some or all of a SEISS grant.
Use this technical documentation for partnership returns if you’re a software developer working with the Self Assessment online service.
How payments to individuals and businesses who use the domestic and non-domestic Renewable Heat Incentive schemes are taxed.
If you operate as a business, find out if you need to include a COVID-19 grant or support payment on your tax return.
Don’t include personal or financial information like your National Insurance number or credit card details.
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