Threshold limit to deduct GST TDS is 2.50 Lacs as per section 51 of the CGST act , if you are GOVT department . please refer section 51of the CGST act.
For the purpose of deduction of TDS, the value of supply shall
exclude the taxes leviable under GST (i.e. ‘Central tax’, ‘State tax’, ‘UT
tax’, ‘Integrated tax’ & Cess). Thus, no tax shall be deducted on
‘Central tax’, ‘State tax’, ‘UT tax’, ‘Integrated tax’ and cess component
levied on supply
* Moreover , if the contract value (Taxable supply) is less then 2.5 lac not required to deduct TDS.
(Reference : Section 51 & SOP on cbic site on TDS)