Is it required to keep track of daily income if you always use invoices?

No, if you always work with invoices, you do not need to keep track of daily receipts!

Daily receipts are only intended for sales to private individuals who do not request an invoice. If you always create sales invoices, your income will be recorded in your accounts via those invoices.

Important: You should never create a sales invoice and enter a daily receipt for the same sale. This would mean double turnover in your accounts, which would result in you paying more taxes than you should.

So, in short: do you always work with invoices? Then just ignore daily receipts!