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At the end of the tax year you must file an income tax return that includes all your income and your business expenses (including depreciation on fixed assets) for the year.
You also need to send a copy of your financial accounts or a summary of your income and expenses.
You can either go to "Get it done online" to complete these returns online or "Forms and guides" to download them. Or you can call our 0800 self-service line on 0800 257 773 to order copies.