Reminder: Sales Tax and Duty Payment Deferral Ends Friday July 03, 2020 | Admin & Tax, COVID-19 On March 27, the government announced that it would allow businesses, to defer all Goods and Services Tax/Harmonized Sales Tax (GST/HST) payments, as well as customs duty payments owed for imports, until the end of June. This measure was enacted to help businesses ease cash-flow challenges through the worst of the pandemic.