Is that price ex or inc GST?
2 · Put some aside (optional)
Monthly takings ÷ 11 × 3 — a rough guide for the GST slice of your quarterly BAS.
3 · The flip
you typed ex GSTType a price above — the flip happens straight away.
ex GST$0.00
GST (10%)$0.00
inc GST$0.00
Assumes you're GST-registered at the standard 10%.
Quick maths, not tax or accounting advice.