It might make more sense to keep the GST at the easily calculated 10% but scrap all the exceptions that were introduced in the beginning.
In theory, an eighth isn't hard to work out for those who don't need a calculator to add 2 + 2, but for the others the extra keystrokes could reduce productivity..
The other concern is that if state governments learn that they can blow their budgets, then demand a GST rise to give them more money to blow, we may be heading for future trouble with demands for further rises. Isn't it time our states learned to work within their budget, and give priority to basics like hospitals and schools rather the to hiring more departmental propagandists?
Personally, I never liked the GST system.
When I was running a small business - a medical practice - I found the GST returns were a total pain as much of my business was exempt anyway.
But, you couldn't even elect to let the B's keep the little return they owed you - it had to be done to
prove you didn't owe them anything.
It was either a lot of work to calculate from cheque stubs, or a lot of work entering it into software to generate reports for you, for relatively little money.
It is easier for larger businesses that can support enough staff to delegate the job, so the owners don't have to take time off from core duties to do the paperwork.