To avoid any delay or non-transfer of TDS refund, you must provide the correct bank account details in the TDS certificate or ITR. These details allow the Income Tax department to transfer the TDS refund via NEFT to your account. Any mistake in providing the bank account details may lead to transferring the amount to someone else or delay. If you have not provided the bank details, you must ensure you have filled the correct address while filing the ITR. It is because the IT department might send TDS refund in the form of a cheque to you.