sales report plus vs monthly invoices

[misflutterby2679]

this may seem like a stupid question, but do other sellers use their monthly invoices or sales report plus monthly reports figures when doing monthly/quarterly/yearly profit and loss statements? For taxation purposes and declaring income, monthly, as in 1st to 30/31st of each month figures are ideally what i want, but our monthly invoices ar done from 16th to the 15th of the following month but classed as a single months invoice. sales report plus data i think is 1st to 31st, however we are almoat half way through july and the latest month available is may when id like to be able to finalise my financial year. The figures on both are different, and they overlap, is there an easier way of getting accurate up to date data without literally manually having to go through everysale in pay pal and bank account, then manually go through each invoice and manually calculate the fees for half the listings in that invoice and half from the next in order to get the correct total.?