zistemo allows you to apply different discounts for your invoice/estimate items:
– Cash discount [other article]
– Fixed discount
– Percentage discount per item
– Total Percentage discount 
– Default discount

Fixed discount

Fixed discounts can be applied by entering a new item with a negative amount to the invoice body:

Percentage discount per item

You can apply a discount for one/several items or apply different discounts for diverse items – just enter % discount to the dedicated field:

Note: You can enter here even a 100% discount.

Total percentage discount

Another alternative is one discount for total invoice/estimate amount – just enter % discount to the ‘Apply discount’ field in the ‘Totals‘ block, as you can see below:

Default Discount for tasks and items

When creating a task or an item you can enter a default discount.

If you’ll add that task or item to an estimate/invoice, there will be already a discount applied – the default discount: