During NEET PG counselling registration, candidates are required to pay a refundable security deposit. This deposit ensures that candidates participate seriously in the counselling process. The amount varies depending on the type of institution, such as government colleges or deemed universities. If a candidate is allotted a seat and joins the institute, the security deposit is usually adjusted against tuition fees. If the candidate does not join the allotted seat or withdraws in violation of counselling rules, the deposit may be forfeited.