The short answer, yes. You can file via your myIR account or some accounting software. However, GST rules can be complex, so we recommend using a professional to ensure you meet your obligations.A GST return is not just declaring the GST on sales and the GST on purchases, but also covers special transactions that might be zero-rated or GST-exempt. Manual credit or debit adjustments may also be required (e.g. to account for private use of an asset). A tax professional looks at all of this and makes the necessary corrections and adjustments when they’re preparing your GST return.