How many days after the service should an invoice be issued?

I’ve been managing an office since 2012 as an INDEPENDENT BUSINESS. As you know, RECEIPT BASIS is valid for self-employment, so I’m writing self- employment receipts when I get my payments. But I’m thinking of turning into a Limited Company soon. In this case, am I required to draw up an invoice within 7 days for the payments that are not made? Or is it still okay if I invoice them when the payment is made? If I’m required to do so now, I have to pay tax for the payments I haven’t received…

As you know for commercial earnings, tax occurs through Accrual.

In accordance with Tax Procedure Law Article 231/5, Service bill is issued within 7 days. (7 days are calculated according to date specified for the receipt in the contract.)

Source :ISMMMO
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