The term 'TAS' in Thomas is an acronym for the job title of Tax Accounting Specialist. This position is responsible for preparing and filing taxes, as well as providing tax advice to clients. The Tax Accounting Specialist must be knowledgeable in all areas of taxation, including federal, state, and local taxes. They must also be able to interpret and apply tax laws and regulations. The Tax Accounting Specialist must be able to work independently and with a team to ensure accuracy and compliance with all applicable laws and regulations.