For GST-registered businesses, correctly accounting for Goods and Services Tax (GST) when recovering expenses from third parties, particularly related companies or customers, is a common compliance challenge. This is the first part of our series clarifying the rules, focusing on reimbursements that are separate from a primary supply.  The Fundamental Distinction: Reimbursement vs. Disbursement  Before you apply any GST  treatment, the critical first step is to determine the n