In terms of Section 2(6) of the CGST Act, 2017, “aggregate turnover” means the aggregate value of all taxable supplies (excluding the value of inward supplies on which tax is payable by a person on reverse charge basis), exempt supplies, exports of goods or services or both and inter-State supplies of persons having the same Permanent Account Number, to be computed on all India basis but excludes central tax, State tax,Union territory tax, integrated tax and cess;
(FAQ ICAI PUBLICATION 06-09-2017 COMPOSITION LEVY: FAQ NO.59)