​While making payment of tax, apart from other things, one should clearly mention following details :

• Head of payment, i.e., Corporation Tax/Income-tax (other than companies)
• Amount and mode of payment of tax
• Type of payment [i.e., Advance tax/Self-assessment tax/Tax on regular assessment/Tax on Dividend/Tax on distributed Income to Unit holders/Surtax]
•  Assessment year – this is a general error that assessees commit as AY is different from Financial year
• The unique identification number called as PAN [Permanent Account Number] allotted by the IT Department.
• The details are displayed on screen and should be confirmed before proceeding with payments.
  
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