Holdback
Also called carry escrow, distribution reserve, escrow holdback.
Holdback is an amount a fund retains from proceeds instead of distributing it, either carried interest kept in escrow so that a later clawback can be funded, or a reserve held against known or expected liabilities, fees and follow-on needs, released when the condition it was held for has passed.
Example
A fund realises $20M and the waterfall entitles the GP to $2M of carry. The LPA requires 30% of carry to be held in escrow until the fund is wound up, so $600,000 goes to an escrow account and the GP receives $1.4M in cash. Separately, the GP holds back $500,000 of the LP share as a reserve against an open tax audit. LPs receive $17.5M now: $20M less $2M of carry less the $500,000 reserve. If the audit closes with nothing owed, the reserve is distributed.
Confused with
Clawback. The clawback is the GP's obligation to return excess carry. The holdback is money set aside so that the obligation can be met without chasing individuals.
Unfunded commitment. Unfunded commitment is money LPs have not yet paid in. A holdback is money already in the fund that has not been paid out.
In practice
Escrowed carry usually earns interest for the GP and is released on the terms the LPA sets. Reserves depress DPI while they sit, so LPs ask what each reserve is for and when it will be released. Auditors look for reserves to be supported by an identifiable liability or a documented plan. On the capital account statement a holdback appears as part of NAV, not as a distribution.