How to check if any refund was due?

On filing of your Tax return, refund is due in case the Tax deducted at source (TDS) or Tax deposited (Advance tax or Self Assessment Challans) is in excess of Tax payable for the year. The said refund will be reflected in your ITR Acknowledgment (ITR-V) for that particular year. In case Tax refund is due to you, you can check the status of refund by visiting following link:
https://tin.tin.nsdl.com/oltas/refund-status-pan.html