Can a UK sole trader use their tax return as proof of employment for the DTV visa in Thailand?

A sole trader in the UK inquired if a tax return could be used as proof of employment for the DTV visa in Thailand, which would involve alternating six months in Thailand and six months back in the UK. Community responses indicated that while a tax return could be utilized, it might not be sufficient on its own. Additional documentation, such as business certificates or incorporation papers, may be necessary to strengthen the application, and users advised submitting a comprehensive set of documents to expedite the process.