Assets Under ManagementAUM
The total pool a fund manages — the base the whole economics scale on, and what TER is charged on.
Why you care
AUM is the total money a fund (or the whole industry) manages: every investor's holdings added up. It's the base everything scales on — the fund's fee is charged as a percentage of AUM, so the pool's size decides both what the AMC earns and how much cost you carry.
Run the numbers
A fund runs ₹8,000 cr of AUM at a 1.5% TER, so it collects ₹120 cr a year in fees (illustrative). Double the AUM to ₹16,000 cr and the rupee fees roughly double even if nobody's return improves. That's why AMCs chase size, and why SEBI ties the fee cap to it.
Where this goes
AUM isn't neutral to you. SEBI caps TER on a sliding scale by AUM: the bigger the fund, the lower the percentage it's allowed to charge. So growing AUM is supposed to hand you a lower cost. The pool itself is built by net flows — sales minus redemptions — month after month.
Why you care
Assets Under Management (AUM) is the total value of everything a fund manages on behalf of its investors — every unit holder's money, added together and marked to today's NAV. You'll see it quoted for a single scheme, for an AMC, and for the whole industry.
AUM matters because it's the base the fund's economics are charged on. The fund house doesn't bill you a flat rupee fee; it takes an annual expense ratio as a percentage of AUM, skimmed off NAV a little every day. So AUM is simultaneously the AMC's revenue base and the surface your cost is calculated on. This has a clean consequence: because the fee is a percentage of the pool, the AMC's rupee income grows as the pool grows, even if it does nothing new. That's the incentive to gather assets. And it's exactly why the regulator refuses to let the percentage stay flat as funds get huge.
Run the numbers
A scheme runs ₹8,000 crore of AUM and charges a 1.5% TER (illustrative):
- Annual fee collected: 1.5% of ₹8,000 cr = ₹120 cr.
- Now the fund gathers more money and AUM doubles to ₹16,000 cr, TER unchanged.
- Annual fee collected: 1.5% of ₹16,000 cr = ₹240 cr.
The AMC's income doubled without a single investor earning a better return. That is the pull of scale for the fund house. But scale isn't free for the AMC either: SEBI's rules mean it usually can't keep charging 1.5% as it grows, because the allowed cap steps down as AUM climbs. So the bigger a fund gets, the more its per-rupee economics are meant to pass back to you as a lower charge.
Where this goes
The direct causal line from AUM runs to cost: SEBI caps TER on a sliding scale tied to AUM, so a larger fund is forced into a lower maximum charge. Read that chain forward — bigger AUM, lower TER cap, lower drag on your return — and you see why fund size is something an investor should actually care about. The pool itself doesn't appear from nowhere: it's the running total of net flows. The stickiest part of those flows is the monthly SIP book that keeps topping it up regardless of the market.