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Please advise me on taxes applicable for services provided for International clients? - applicable taxes on used trailers

Hello,

We are a market research company providing telephone data collection for our customers abroad. What are the different taxes payable by us and by recent legislation in India.

I collect tax international transfers, if so, under what conditions. The fees are applicable when the data collection is done in India, although its use by our customers abroad?

Moreover, the payment of the tax service from us, the providers of these services was called again?

If someone links to relevant Web sites can provide specific information about them, then I would be very grateful.

Thanks

Raghav