- Apply tax documentation registration procedures, distinguishing the different models based on their nature and purpose, and identifying the Units. - Administrative authorities responsible for processing in each case. - Analyze, based on a given fiscal profile, the different alternatives for taxation in Personal Income Tax and VAT of economic activities and returns, differentiating the different application regimes and their formal and material obligations. - Apply the techniques of the state, regional and local tax settlement procedure based on their own characteristics, analyzing the applicable regulations and carrying out the appropriate calculations. - Use computer applications to complete declarations and self-assessments, recognizing the different concepts that constitute a declaration or self-assessment. - Analyze the regulations applicable to the Spanish tax system, identifying the main tax figures and elements. - Apply direct, telematic and telephone communication techniques and procedures in situations of information, attention, guidance and tax assistance to taxpayers.