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Do I need to fill in any other forms (like self-assessment tax return) when paying class 3 voluntary contribution? Because in the GOV website, it mentioned: 'Other reasons for sending a return (which referred to self-assessment tax return) You can choose to fill in a tax return to: - claim some Income Tax reliefs - prove you’re self-employed, for example to claim Tax-Free Childcare or Maternity Allowance - pay voluntary National Insurance contributions' Thank you very much!