Quote from accountingbyte on 13. October 2025, 14:18

The information you will need to fill in your self-assessment tax also includes your Unique Taxpayer Reference (UTR), National Insurance number, records of income, expense receipts, and information about your untaxed income. Documents like P60s, P45s and bank/ pension fund statements are also needed to support. Such records assist in serving as a means of ensuring that all income is well reported as well as all the deductions which are possible claimed. By ensuring that your accounts are fully and systematically documented, you can be assured that your tax return is filed properly by accountants, reducing the risk of errors, financial penalties by the HMRC, and paying the appropriate amount of tax at the correct time.