A Letter of Authorization for GST is an important document to share power. Us to request the fee be added to your case.To fill out the form completely: Item 1: check which Board you are appearing before. Item 2: describe the project. To. The Authorised Officer. Activities are eligible for that tax credit. The eligibility for that particular tax credit is proposed in the budget to be phased out. "Presidentelect Trump's comments show a complete lack of understanding of what makes Canada a strong country. Our economy is strong. The contract price excludes the Goods and Services Tax (GST).