The OECD TaxBEN methodology and manual describes key modelling concepts such as the treatment of regional differences, the family types and labour market characteristics that are currently supported by the model, its policy scope, and the assumptions underlying the calculation of taxes and benefits. The document also describes how to use the web calculator and the underlying STATA command. The STATA command is available through a dedicated online platform, which may be accessible after the review of the application process (please contact the OECD team for additional information).