I have let out a property for Rs.20,000 per month. The tenant is deducting tax that is more than my tax liability. What can I do under this circumstance?

If you compute your tax liability and find it to be lower than the tax being deducted, you may approach your assessing officer by filing Form 13. He will issue a certificate directing the tenant to make TDS at a lesser rate. This form is available with the local Income tax office or can be downloaded from eLagaan website (Downloads section).