If you are seriously planning to upgrade your computer system soon, it would be a serious loss not to take advantage of this year, immediate $20,000 tax write-off if your business turnover is less, then $2 million dollars. If so you are running out of time, for this year's deduction. I would suggest that if you are in a position to take advantage of this concession, you should do so. Note you can always get another $20,000 next year, and then it ends.
It’s a great opportunity to spend on something that will help you work smarter and more efficiently, improve your shop and allow you to offer better customer service. We are currently sending out some good offers for our clients.
I would suggest that you speak to your accountant about it ASAP.