How to Close the Books in QuickBooks Desktop You will want to close your past accounting periods to ensure that old invoices from InvoiceASAP don't accidentally update your old accounting periods in your QuickBooks. This article shows how. STEP 1: In QuickBooks, click on Edit > Preferences STEP 2: Select Accounting > Company Preferences. The click on the Set Date/Password button. STEP 3: Enter the date you want your books closed, set a password and click OK. STEP 4: The closing date is set. No invoices edited prior to this date will sync into your QuickBooks. STEP 5: If an invoice from the closing date or earlier syncs, you will get a notice to let you know that the period is closed. STEP 6: The sync is successful, even though the invoice did not get updated in QuickBooks. Have more questions? Submit a request 0 Comments Please sign in to leave a comment.