From 1 October you lose
$0
per month ($0 a year) in surcharge revenue
The fix: raise all prices by
0%
and you break even — customers pay the same total they do now
What about my customers who pay cash?
The calculator already accounts for them — it's why your rise is smaller than your surcharge. You only lose surcharge revenue on card sales, but you recover it across all sales, so the rise is spread thinner.
On a $10 item with a 1.5% surcharge: a card payer used to pay $10.15 and now pays about $10.13 — slightly better off. A cash payer used to pay $10.00 and now pays about $10.13.
So yes — cash customers chip in a little toward card costs. That's built into the ban itself, not this tool; every business in Australia faces the same shift. If it matters to you (especially on big invoices), cash discounts are still legal — the ban stops you surcharging cards, not discounting cash. Raise prices by your full surcharge rate instead, then offer that % off for cash, and you've recreated the old setup.