Do management fees on undeployed fund capital make sense, or is that paying the manager to wait

That description of the costs is right and the number that matters is the absolute dollars, not the percentage. Two percent on a $50M fund is $1M a year. That covers a manager, two analysts, admin, audit, insurance and travel with something left over. Two percent on a $400M fund is $8M a year and no one needs $8M to run a real estate fund. The fee is the same number in both LPAs and it means completely different things. So the better question isn't whether commitment-based fees are fair in principle, it's what the actual budget is. Some managers will show one. The ones raising their fourth fund generally won't.

@sonia_alvarez is pointing at the right thing, but the deployment deadline clause is what actually protects an LP, and it is the one most people skip reading. Look for the investment period length and what happens to the fee if capital is not called by the end of it. In a decently negotiated LPA the fee steps down to invested capital at the end of the investment period whether or not the money went out. If that language is missing, the manager can extend the period and keep charging on the full commitment. Run the drag on a hypothetical: a four year investment period with average deployment pace meaning roughly 55 percent of a fund is invested across those four years works out to paying 2 percent on 100 percent of committed capital while earning only on the 55 percent deployed. On 100k committed that is roughly 8,000 of fee over four years against about 4,400 if it were charged on invested capital only. That 3,600 gap has to be earned back out of returns before an investor is even. Not fatal on its own. Also not nothing, and it rarely gets presented that way in the deck.

I've committed to four funds and the fee basis has never once been the thing that determined the outcome.

What determined the outcome was whether the manager bought well in years two and three. One fund I'm in charged on commitments the whole way and returned fine because he bought three assets in a soft window. Another charged on invested capital, felt very investor friendly on paper, and sat on dry powder for two years waiting for prices that never came, then panicked into two mediocre deals at the back of the investment period.

The second one had better fee terms and I lost money in it.

So I vote for the deployment deadline option, because that's the only one of the four that's actually about behavior. The rest is arguing over 40 basis points of drag on something whose spread of outcomes is 15 points wide.

Two clauses to read alongside the fee section, because they change what the fee number means. First, the fee offset. Some funds charge acquisition fees, asset management fees at the property level and financing fees on top of the fund management fee. In a well-drafted LPA a percentage of those flows back to reduce the management fee. In a badly drafted one they don't, and a stated 2 percent can end up closer to 3.4 percent all in. Searching the document for the word offset and finding nothing tells you something. Second, recycling. If the LPA lets the manager reinvest returned capital during the investment period, and the fee is on commitments, the manager can turn over the same capital twice and charge on the full committed amount the whole time. That's usually a good deal for both sides, but it's still worth knowing it's in there. @marcus_hale41 is right that deployment behavior swamps fee terms in the outcome. Where the fee section still earns attention is as a readable signal about the manager. A sponsor who has thought carefully about offsets and step-downs has generally thought carefully about other things too.