Harish Palaniappan's

If you earn in India through salary, or your business or services in india, which are taxable, you can pay taxes, file income tax returns, everything online through below links.

Prerequisites are:
1. You should have a PAN number. or you can e-apply for one through http://incometaxindia.gov.in

2. You should have a digital signature to submit all filled up forms(if any) online. you can obtain a digital signature through www.tcs-ca.tcs.co.in You can use the digital signature for all egovernance initiatives like registering a company, also use it on any website that accepts digital signatures today or in the future.. so your investment in acquiring a digital signature is valuable for long term.

Income tax returns e-filing: http://incometaxindiaefiling.gov.in/portal
Pay taxes online: https://tin.tin.nsdl.com/etax

For more information on taxes and tax return filing: http://incometaxindia.gov.in

For queries on filing taxes or income returns, or PAN, TAN applications etc.,
you can contact a toll free number advertized on http://incometaxindia.gov.in.

And oh.. did I forget to mention.. all / most services are free, it costs zero bucks to file your returns, except a few like PAN applications are costed but low cost (below 250 rupees).. And you only spend for paying taxes, and acquiring a secure digital signature.

And if you are not the computer friendly, or an accounts friendly person, you can ask for a 'Tax Return Processor' an agent authorized by the government to drop-in at your office/home and help you with filing returns for free or for a fixed maximum cost of 250 rupees only. These TRP agents are paid some commissions on the taxes you pay, so only a few of their services cost within 250.. and the rest is free.