Mutual Funds Agents commissions -
1) Commission from Client
This is the commission which customer pays to the agents for their service. It generally ranges from 0.5% – 2%.
This is the commission you will pay to agent every time you do the investment. Example - If you invest Rs 10,000 per month and your agent charges commission @1% , he gets 1% of 10,000 = Rs 100 every month.
2) Upfront Commission
Upfront commission is the commission paid by AMC (mutual funds company) to agent in the first year. The commission varies from one AMC to another and varies across different categories of mutual funds. Example - If upfront commission is 0.5% , and your SIP is Rs 10,000 per month , then upfront commission would be 0.5% of 10,000 = Rs 50 per month , ie : Rs 600 for 1st year.
3) Trail Commission

This commission is mostly hidden from general public. Trail commission is the commission paid to agents by AMC in subsequent years. The most important point you should know is that trail commission is percentage of total AUM (total worth of customer). So if your total Worth of investments in a particular year is Rs 10 lacs and trail commission is 0.5% . AMC will pay 0.5% of 10 lacs = Rs 5,000 to the agent. This is the commission paid to your agent out of your money, Its adjusted from NAV. Which means that if an agent has 100 clients who have Rs 10 lacs of investments (current worth , not investment) with an AMC, then total AUM (assets under management) of that agent is total worth of all the customers, which is Rs 10 lacs X 100 = Rs 10,00,00,000 (10 crores) . So he will get 0.5% of 10 crores = Rs 5 lacs.

Source - JagoInvestor.com