Welcome to the Community, @sangeetha-softai.
Let me ease your confusion about changing the date of a paid invoice.
Once you mark an invoice as paid in QuickBooks Self-Employed (QBSE), it'll default to today's date. Please know that QBSE only offers a simplified invoicing feature. Thus, the ability to modify invoice payments, such as the date, isn't available.
Just in case you need help categorizing your transactions in the future, you can check out this article for more guidance: Categorize transactions in QuickBooks Self-Employed.
Please know that I'm just a reply away if you need any further assistance managing your invoices in QBSE. Have a good one!
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