As of 2018 IMS BHU does not bind you with any bond after the completion of service but in case if you were to leave the course after taking admission there then a penalty sum of rupees 3 lacs us to be paid for the same and that is the update which you have as of now and if there any further updates you shall get it on the website of Banaras Hindu University so kindly login to the portal over there and check out the bulletin for further information