Whether tds is deductible on purchase of computer software

If you have purchased computer software without any customisation, then no need to deduct TDS.

If any customisation have been done than it will be considered as Technical Services and will attract TDS U/s 194 J @ 10%.

For more details, please go through the link which states about the notification 21/2012:

https://www.itatonline.org/info/index.php/no-tds-us-194j-on-payments-for-software-purchase-cbdt-notification/