A capital call line is a loan to a fund, secured by money its LPs have promised but not yet sent. Used well, it lets a VC fund close deals fast and call capital on a predictable schedule. Used carelessly, it flatters IRR and hides the fund's real pace of deployment from its LPs.
When LPs commit to a venture fund, they don't wire their full commitment on day one. The GP calls capital in tranches as it makes investments and pays fees, and each call comes with a notice period. A capital call line, also called a subscription line of credit or subscription facility, sits in between: the fund borrows from a bank to fund a deal now, then repays the bank when the LP money arrives. Because the bank's collateral is the fund's right to call that uncalled capital, these lines are generally priced as low-risk lending for the bank.
Line and fund sizes from Stifel Venture Banking's published capabilities, as of October 15, 2026. ILPA guidance from ILPA's June 10, 2020 release.
How a Capital Call Line Works
Why VC Funds Use Them
Speed. Competitive rounds close fast. A line lets a fund wire on the founder's timeline rather than the capital call notice period in its LPA.
Fewer, more predictable capital calls. LPs, especially individuals and family offices in emerging manager funds, prefer a few planned calls a year to a call every time a deal closes. Batching draws into quarterly calls also cuts the admin work for the fund and its fund administrator.
A cushion for timing gaps. If an LP is late on a call, or a deal and a fee payment land in the same week, the line covers the gap without holding up the investment.
The Catch: What It Does to IRR
IRR clocks returns from the day LP money goes in. If a fund invests with borrowed money in January and calls LP capital in June, the LPs' money has been at work five fewer months for the same gain, so IRR goes up, while the interest on the line slightly reduces the actual dollars returned. Over a whole fund, keeping draws outstanding for long periods can make IRR look better than the underlying investments justify, and it makes funds that use lines hard to compare with funds that don't.
That is why the Institutional Limited Partners Association published guidance on subscription lines in 2017 and followed it with disclosure recommendations in June 2020. ILPA asks GPs to report, each quarter, the total size and balance of the facility, the average number of days drawdowns are outstanding, and net IRR with and without the line, and to disclose the key terms, such as the lead bank, drawdown limit, maximum borrowing period and fees, each year. If you're raising from institutional LPs, expect them to ask for this. For more on how LPs judge reported returns, see our VC performance dashboard.
Who Provides Capital Call Lines
Most venture fund lines come from fund banking groups at banks that specialize in the innovation economy, often the same banks that hold the fund's operating account and lend to its portfolio companies. Two examples:
Stifel Venture Banking is a Value Add VC partner. Facts about Stifel come from its fund banking and capabilities pages.
Five Questions to Ask Before You Sign
How big is the line relative to unfunded commitments?
The borrowing base is set by your LPs' uncalled capital, and lenders typically count stronger LPs more heavily. Know what share of your commitments actually supports the line.
How long can each draw stay outstanding?
A line used to bridge a few weeks between a deal and a capital call is very different from one that stays drawn for a year. ILPA asks GPs to report the average days each drawdown is outstanding.
What does the LPA allow?
Your limited partnership agreement should state the maximum size, how long borrowings can remain outstanding, and what the line can be used for. LPs will read it.
What are the fees beyond interest?
Ask about upfront fees and unused fees on the undrawn portion, not just the rate. Banks set pricing per relationship, so compare full quotes.
Can you report it the way ILPA asks?
Quarterly: the facility's size and balance, the days drawdowns stay outstanding, and net IRR with and without the line. Your fund administrator should be able to produce this.
Bottom line: a capital call line is a timing tool, not a source of returns. Use it to close deals on time and keep capital calls predictable, keep draws short, and report it the way ILPA asks. LPs will trust your IRR more if they can see the number without the line. Portfolio companies can get debt from the same kind of bank; see our ranking of the best venture debt lenders.
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