The Aged Payable and Aged Receivable reports always show the payment due as of today and to be received or paid in the coming days.
Look at the following report of Aged Payable that shows you the amount which is due as of today; you can drill down by individual vendors, and then, by vendor bills later:
The same as the Aged Payable report, the Aged Receivable reports show the customer due as of today and in the coming days. You can drill down by the individual customer, and later, invoices:
Tax Report
Tax Report shows you the tax collected on sales and the tax paid on purchases in a single screen:
You can get the net amount and tax amount by ledger, and compute the tax which is payable in the end.
