VAT in Argentina amounts to 21%.
At the airport, and on departure day, you may request to be refunded the Value Added Tax (VAT) paid for articles purchased in shops having a sign reading: TAX FREE. To that purpose, you should keep all invoices or tickets and fill out a form you may request at the Airport.
"Source: Tourism Portal, Ente Turismo de Buenos Aires - www.bue.gov.ar".