Income Tax Act 2007: Primary legislation that defines self-employed income and establishes requirements for income reporting. Essential for ensuring accurate income statements in the proof of income letter.

Finance Acts (Current and Recent): Annual legislation that updates tax rules and requirements, affecting how income should be calculated and reported for self-employed individuals.

Self-Employment Income Support Scheme (SEISS) regulations: Specific regulations governing COVID-19 support payments for self-employed individuals, which may need to be included in income calculations if applicable.

Fraud Act 2006: Criminal law statute ensuring all financial statements and representations are truthful and accurate, preventing false representation of income.

Data Protection Act 2018 and UK GDPR: Privacy and data protection legislation governing how personal and financial information should be handled and shared in documentation.

Money Laundering Regulations 2017: Financial regulations ensuring compliance with reporting requirements and verification standards for financial documentation.

Small Business, Enterprise and Employment Act 2015: Legislation relevant to business structure and reporting requirements for small businesses and self-employed individuals.