If TDS is not calculating automatically in BUSY, Then follow the below steps.
Step 1: The TDS feature should be enable in the party master and set the applicability after limit.
Step 2: Mention the PAN number in the party master for calculating the correct TDS value.
Step 3: In the TDS bill sundry, the correct tds account should be tag and default value should be zero.
Step 4: In the TDS bill sundry, The tds deduction amount should calculate either on net bill amount or taxable amount as per your requirement.