A tax refund is a reimbursement to taxpayers who have overpaid their taxes, often due to having employers withhold too much from paychecks. The U.S. Treasury estimates that nearly three-fourths of taxpayers are over-withheld, resulting in tax refunds.The income tax refund should be credited to your bank account within 45 days of ITR processing. If it takes longer, you should check with the CPC on why it is getting delayed.