VAT return filing in the UAE is a mandatory process for VAT-registered businesses, requiring submissions to the Federal Tax Authority (FTA) either monthly or quarterly depending on turnover. The VAT return document must be accurately filled with details on sales, purchases, and tax liabilities, with strict penalties for late submissions or incorrect filings. The process is conducted online via the FTA portal using the 'VAT 201' form, and businesses should seek assistance if needed to ensure compliance.