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Do I have to pay taxes on income from my website or profits?
Being a tax professional, my understanding is that the threshold limit is a single limit for all your source(s) of income. Now many people who already draw salary which is liable to tax, develop application for mobile and generate some income. Such income is liable to tax, if along with other income they exceed the threshold limit.  Income will have surely related expenses. And the expenses which are related to earning of the income are allowed to be deducted.