Can I input onto quick books, previous paid invoices made with a previous app so that my yearly reports are accurate?

Hi usermichaelrj92, 

Thanks for joining us here on the Community. 

You can backdate invoices as far as needed when entering these manually or use the inbuilt import tool (Cogwheel > Import data) to transfer multiple invoices in one go. 

If you've already submitted the VAT on these invoices prior to joining QuickBooks you can enter the VAT as no VAT, or select the appropriate VAT code and then mark the period as filed on the Taxes screen if you've not yet made a VAT filing on QuickBooks.  

Please get back to us below if you have any questions on this!