File

1. 
   
   AY 06-07 - Local Tax Associates - Rs. 150
2. 
   
   AY 07-08 - Same - Rs. 200
3. 
   
   AY 08-09 - CA Referred by a friend - Rs. 150
4. 
   
   AY 09-10 - DIY - E-filing - FREE + Postage Cost Rs. 5 (Link)

1. 
   
   Register at Income Tax India E-Filing. (Link)
2. 
   
   Download relevant Excel sheet to fill the return
3. 
   
   Copy-Paste data from your Form 16
4. 
   
   Look at your Bank Statements, FD's and NSC interests. Fill in column 2(b).
5. 
   
   Calculate the Tax
6. 
   
   If you have to pay additional tax then go to this link. See the e-payment procedure and head towards 'Pay Taxes Online' link. Do online payment, and collect your challan number which is to be quoted in IT Return. Simple.
7. 
   
   Re-Check the Excel sheet.
8. 
   
   Generate XML
9. 
   
   Submit the file through your registered account. You'll receive the ITR-V acknowledgement
10. 
    
    Mail the acknowledgement with your signature to local IT office within 30 days.
11. 
    
    Done. They will email you a scanned document of stamped acknowledgement soon.

1. 
   
   Register at some XYZ third party web-site
2. 
   
   File few web-forms
3. 
   
   Upload Form 16 and Investment details
4. 
   
   Pay the fees - Typically Rs. 150
5. 
   
   They send you the Form V.
6. 
   
   Mail the form to IT office.

1. 
   
   Go to the agent with PAN photocopy and Form 16
2. 
   
   Fill a simple form
3. 
   
   Go back to collect your acknowledgement form
4. 
   
   This usually costs from Rs. 150-250 for basic plan.

1. 
   
   Print the relevant form (ITR-1, 2, 3, 4 etc)
2. 
   
   Fill it
3. 
   
   Go to IT Office. Stand in the queue. Submit it and take acknowledgement.

Chart: Absolute percentage tax paid by me in last 4 years.