Yearly income slab (approx fig not exact) uptil 1,20,000-nil 1,20,000Rs-1,30,000Rs -10% 1,30,000Rs-2,00,000(not sure)Rs -20% 2,00,000Rs and above 30% All income need to be divided in these slab .... this is annual not monthly. for eg you have 1,50,000 income so ull pay 1000 for second slab and 4000 for third slab I.e total Rs5000 Income tax is paid mostly paid at end of fiancial year however still consult and tax clerk as CA may cost you more.
Standard tax rules apply, it's the same as you work for a company. The slabs are equally applicable. Best thing would be to have your wife/mother or gf (beware ) be the beneficiary of this adsense account and thus you could save on some tax.
i think if your earning is more than 1.5 lakh.. then you have to pay income tex at the end of march. you can calculate the tex on their website.. (incometex department). there is a application TEX CALCULATOR. u can use that.
As all said. No need for any extra tax. It will counted as your income and you will have to pay income tax in defined slab.