GST Not Calculating Automatically in Tally Prime. In a few scenarios, GST is not calculating automatically in Tally Prime.

You can do the following to automate the calculation. The HSN will appear from the master in which the tax rates are defined.

Based on the HSN code displayed in the Tax Analysis screen of the invoice, you can identify the master from which it is captured.

**If HSN and tax rates are defined in the stock item, different HSNs appear for each item, as shown below:

** If HSN and tax rates are defined in the sales or purchase ledger, the same HSN appears for each item, as shown below: