When GST is enabled, rounding can be set to the nearest cent or nearest 5 cent. The formal term for this rounding technique is Round Half Up; or Round Half Away From Zero, since the tax will always be a positive number. GST will only be applied to the subtotal of all products instead of individual products. When rounding to nearest 5 cent, the final price will always be a multiple of 5 cent to ease cash payment.
When no GST or discount is applied to the purchase, there will be no rounding even if you have set the rounding to the nearest 5 cent. Therefore the final price will always be the sum of all products purchased. Rounding will only take effect if GST or discount is applied.
Product A $10.00 Product B $5.50 Subtotal $15.50 GST %7 $1.09 (rounded up from $1.085) Final $16.59
Nearest 5 cent
Product A $10.00 Product B $5.50 Subtotal $15.50 GST %7 $1.10 (rounded up from $1.085) Final $16.60 (will always be a multiple of 5 cent)
Product A $9.00 Product B $4.00 Subtotal $13.00 GST %7 $0.90 (rounded down from $0.91) Final $13.90 (after rounding from $13.91)