Due Dates enables you to track payments from customers. It forms basis for Overdue Sales Invoice Report. It becomes inactive if cash or bank account is selected in account.
Enter name of customer, if you don't have customer name then leave it as it is. In case of debtor/creditor account it is auto filled. You can edit this using edit account option.
Invoice No. is autofilled by then invoice number last used increased by 1. If the invoice number is already used then an error will be shown at time of saving.
GSTIN for the debtor/creditor will be autofilled and not editable. In case of sale through e-commerce operator GSTIN of the final customer is to be used.
Place of Supply will be auto selected on the basis of your GSTIN and party's GSTIN. IGST or CGST/SGST/UTGST will be selected on its basis. Change it only when you know what you are doing.
If you do not want to maintain inventory then you can directly sales account here. You can also use it for entering Cartage, service charge etc.
If the prices of and price includes GST then select this option. If selected then applicable to the complete page.
For example- A sale is made to a customer in Rs. 500 (including 18% GST). So rather than calculating 18% GST in 500 you can feed 500 in price and select 18% and then select this option."
This will be printed in Invoice. You can use this to feed your bank details or your terms and conditions.