The ISEPC RCMC is issued for a fixed period of five financial years. The validity always starts on the 1st of April of the year you apply. It ends on the 31st of March of the fifth year.
You must pay the Annual Subscription Fee every single year, even if the five-year validity has not ended. You must pay this fee before the 1st of April each year. If you do not pay the annual fee, your RCMC becomes inoperative immediately. This means you cannot claim any benefits, even if your five-year certificate is still valid on paper.
Before the end of the fifth year, you must apply for revalidation. You submit a simple application with an updated CA certificate showing your current turnover. After paying the necessary fee, you get a new five-year certificate. You must track these dates very carefully.