As a taxable person, can I request a refund any time I want to?

No, you must request a refund within 5 years from the end of the year in which any of these qualifying conditions have taken place:

• There is an excess deductible net tax per tax return. The excess tax can be carried forward by the taxpayer to the next tax period.
• The taxpayer’s VAT payment exceeds the net tax payable amount.
• There’s excess recoverable net tax when the taxpayer has applied for deregistration.