For the purpose of availing composition how will aggregate turnover be computed for the purpose of composition?

Aggregate turnover shall be computed on the basis of turnover on all India basis. It includes 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 but excludes GST and cess.