Yes, the aggregate turnover of a taxpayer includes the value of inward supplies received on which reverse charge mechanism (RCM) is payable.

According to the Central Goods and Services Tax (CGST) Act, 2017, the aggregate turnover of a taxpayer is the value of all supplies (taxable supplies exempt supplies exports inter-state supplies) made by the taxpayer during a financial year.

As per the definition of turnover, it includes the value of all taxable supplies, including supplies on which the recipient is liable to pay tax under reverse charge. Therefore, the value of inward supplies received on which RCM is payable should be included while calculating the aggregate turnover of a taxpayer.

It is important for taxpayers to accurately calculate their aggregate turnover, as it determines their eligibility for registration under GST, filing of GST returns, and various other compliance requirements under the GST regime.