GST in tricky industries: where the coding gets complicated
GST is rarely just ten per cent. A look at the industries where mixed supplies, GST-free items and margin schemes make coding genuinely hard.
For most businesses, GST is straightforward: charge it, claim it, and report the net figure. For clients in certain industries, though, GST is anything but simple. Mixed supplies, GST-free items, input-taxed sales, and special schemes mean the coding decisions carry real risk. A practice that recognises which clients sit in these tricky areas can build the right checks into their bookkeeping and BAS work.
Food and hospitality
Food is a classic GST minefield because some items are GST-free and others are taxable, sometimes depending on how they are sold. A café selling both dine-in meals and packaged grocery items may have a genuine mix of taxable and GST-free sales. Getting the point-of-sale system coded correctly at the item level is the only reliable way to keep the BAS accurate.
The detailed food classification rules are published by the ATO, and for a client with a broad product range it is worth a periodic review of how each line is coded.
Health, education and childcare
Many services in health, education, and childcare are GST-free, but rarely all of a provider's income. A medical practice may have GST-free consultations alongside taxable services such as reports or cosmetic procedures. The risk is treating everything as GST-free by default and under-reporting the taxable slice.
- Separate GST-free core services from taxable ancillary income.
- Review new service lines when they are introduced.
- Document the basis for each classification.
Property and the margin scheme
Property is one of the most complex GST areas. New residential premises, commercial property, going concerns, and the margin scheme all have their own treatment, and the amounts involved make errors costly. Whether the margin scheme applies, and whether it was correctly agreed in writing, can change the GST on a sale substantially. Property clients almost always warrant specialist attention rather than default coding.
Financial services and input-taxed supplies
Financial supplies are input-taxed, meaning no GST is charged but input tax credits are generally not available either. Clients providing these services face reduced credit rules and financial acquisitions thresholds that most other businesses never encounter. It is an area where getting the mechanics wrong quietly distorts every BAS.
Build industry awareness into your process
The practical lesson is that GST risk is not evenly distributed across a client base. A handful of clients in these industries account for most of the difficulty. In Finye you can tag those clients and attach an industry-specific review step to their recurring BAS jobs, so the team knows to scrutinise the coding rather than assume the default is right. This targeted attention is far more effective than treating every client the same. You can find more workflow ideas in Finye's guides.
Review coding when circumstances change
GST classifications are not set once and forgotten. A client who adds a new product line, opens a second location, or moves into a related service can shift the mix of taxable and GST-free supplies without realising the reporting has changed. Building a periodic coding review into the work for these higher-risk clients catches those shifts before they compound across several statements, which is far cheaper than unwinding a year of miscoded transactions during a review.
When to seek a private ruling
For genuinely unusual arrangements, a private ruling gives certainty that no amount of internal analysis can match. Where a client's GST position is both material and unclear, the cost of a ruling is small against the risk of getting it wrong for years. Knowing which industries carry the real GST complexity, and giving those clients the extra scrutiny they need, keeps the whole client base on solid ground.