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. The discount will be rounded if no GST is applied.
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 $7.50 Subtotal $17.50 Discount -$2.00 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)
Product A $4.00 Subtotal $4.00 Discount 11% -$0.45 (rounded up from $0.44) Final $3.55 (after rounding from $3.56)