Writing off unpaid invoices

I have accumulated 3-4 invoices that need writing off since the client did nto pay them before closing their business.

How can I go about this?

I found this instruction:
https://docs.erpnext.com/docs/v13/user/manual/en/accounts/articles/accounting-for-bad-debts

One question that comes to mind is there are two parts of the invoice:
product amount
sales taxes collected

I want to, of course, remove my over all general income(the above instruction talk about claiming it as a business loss, how do I find or use this loss as an expense sat the end of the year?)

Secondly, I need to account for the amount of money for which I am responsible to pay in sales taxes to the government. It has already been paid. I want to make sure that this amount will be reduced from my future obligations. How to I ensure this amount is reduced on the taxes in quetsion?
Thanks

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