This document discusses balance sheets and GST basics for a trading business. It contains sample questions and explanations about classifying transactions related to GST on a balance sheet. Specifically, it addresses situations where a business has collected more or less GST than paid to suppliers, and whether GST paid on purchases meets the definition of an expense. The document explains that GST owed is a liability, as the business has an obligation to repay the tax office, and that GST paid increases assets but not equity so it is classified as a liability rather than an expense. It also addresses how a GST refund would be classified as a current asset on the balance sheet.