Are there any deadlines for filing an application for VAT refund?

Yes.

By 30 June - this deadline is valid for countries outside the EU requesting refund from EU countries. Transactions made from January to December of the previous year will be included there.

By 31 December – this deadline is valid for countries outside the EU requesting refund from Great Britain. Transactions made from 1 July of the previous year until 30 June of the current year will be included there.

By 30 September – this deadline is valid for EU countries requesting refund from EU countries. Transactions made from 1 January until 31 December of the previous year will be included there.