GST Audit Exercise Advantages. To an assessee – Normally, the tax department conducts an audit or assessment after the close of a financial year. It is customary to expect that the departmental audit / assessment is conducted after the close of the financial year except in cases where investigations, inspections or special audits are taken up. Naturally, any levy of additional taxes either due to non-compliance or incorrect comprehension of the complex tax laws would result in taxes plus consequential interest and penalty. GST being a tax on supplies, would tend to wipe out the top line in such cases.