Subscription Lines of Credit: How Sub Lines Distort Reported PE/VC Fund IRR

The number GPs show you isn't the number you think it is

Here's what nobody tells individual accredited investors when they're handed a pitch deck with a fund's net IRR (internal rate of return, the annualized return that accounts for both the size and timing of cash flows) next to a peer benchmark. That IRR is a function of two things: how much money came back, and how long the money was "out." A subscription line of credit (a facility the fund draws on, collateralized by investors' unfunded capital commitments, to fund deals immediately instead of waiting on a capital call) shortens the second variable without touching the first. Your money technically hasn't left your account yet when the deal clock starts ticking on the GP's side. By the time you actually wire cash, the fund may already be six months or more into holding the investment. Your personal holding period compresses. Your personal IRR goes up. Nothing about the underlying company's performance changed.

I want to be direct about why this matters specifically for you, the individual LP (limited partner, the investor in a fund, as distinct from the GP, or general partner, who manages it) sizing up a manager's track record before writing a check. Institutional allocators (pension funds, endowments, funds of funds) have consultants who model this out and demand the adjusted numbers. Most individual investors evaluating an emerging manager's Fund II or Fund III pitch deck have never heard the term "subscription line" and have no way to know that the eye-catching 24% net IRR on the cover slide might be a 19% or 20% IRR once the credit facility's timing effect is stripped out. That gap is not disclosed by default. You have to ask for it.

How a subscription line actually works, and the mechanics of the IRR lift

A subscription line (also called a subscription facility, capital call facility, or "sub line") is a revolving loan made to the fund itself, not to any individual portfolio company. The collateral isn't a building or a balance sheet. It's the LPs' contractual obligation to fund capital calls. Banks underwrite the facility against the credit quality of the LP base (a fund with big, blue-chip institutional LPs gets a better advance rate than one with a roster of first-time individual investors) and typically size it at somewhere between 15% and 30% of total fund commitments. Per Loeb Smith's guide to fund finance structures, these facilities are usually short-term and revolving, with individual draws outstanding for 90 to 180 days before the GP calls LP capital to pay the facility down.

Here's the mechanical sequence. The GP identifies a deal, needs $10 million to close it, and instead of sending LPs a capital call notice with a 10-business-day funding deadline, draws $10 million from the subscription line same-day. The deal closes. The investment clock, the one that matters for calculating gross IRR at the deal level, starts running. Weeks or months later, the GP issues the actual capital call to LPs, collects the cash, and uses it to pay down the facility. From the fund's standpoint, the deal has been "at work" since the draw date. From your standpoint as an LP, your money has been at work only since the date you actually wired it, which is later, and for a shorter period.

Because IRR is a time-weighted measure, shrinking the time between when your cash leaves your account and when the fund eventually returns capital to you mechanically raises the annualized return, even if the total dollars distributed at exit stay exactly the same. MOIC, in contrast, doesn't care about timing at all. It is just total distributions divided by total capital contributed, so MOIC stays roughly flat (and typically ticks down slightly once you net out the facility's interest cost, which the fund pays and which reduces the profit LPs receive at the end). This is the tell: when a fund's IRR looks strong but its MOIC looks merely average relative to peers, a sub line is often part of the explanation.

The table below shows a simplified version of this using real arithmetic, not hand-waving. Same $10 million commitment, same underlying deal, same $22 million gross exit value at Year 5. The only difference is whether the LP's own cash was called on day one or bridged for six months by a facility.

Same deal. Same exit. A roughly $200,000 haircut to account for the facility's interest cost, which is realistic for a mid-single-digit-rate line drawn for six months on $10 million. The result: MOIC drops two basis points from 2.20x to 2.18x, essentially unchanged, while IRR jumps by about 180 basis points, from 17.08% to 18.91%. Multiply that gap across a $200 million fund with a dozen deals and a facility in near-constant use across the investment period, and the cumulative IRR inflation reported to marketing materials and third-party databases can run into the mid-single digits of percentage points. That's frequently the difference between a fund landing in the top quartile of its vintage-year peer group and landing in the middle of the pack.

This isn't a fringe practice. It's most of the market

Subscription lines stopped being a niche cash-management tool years ago. According to Dataintelo's Subscription Credit Facilities Market Report, the global market for these facilities was valued at roughly $752.4 billion in 2025 and is projected to reach $1.5 trillion by 2034, growing at a 7.9% compound annual rate. Separately, fund finance market surveys cited in the same research found that 94% of surveyed market participants used subscription facilities in 2025. If you're looking at a buyout or growth-equity fund raised in the last five years, the base-rate assumption should be that it used one, not that it might have. ILPA's own subscription-lines resource page confirms that despite guidance dating back to 2017, inconsistency in GP disclosure quality remains common across the industry.

The Institutional Limited Partners Association (ILPA), the trade body that represents institutional LPs and sets much of the industry's disclosure norms, first flagged the issue in 2017 guidance and followed up in June 2020 with a more specific ask: GPs should disclose, on a quarterly basis as part of the partners' capital account statement, the total size of the facility, the outstanding balance, each LP's unfunded commitment financed through the facility, the average number of days each draw stays outstanding, and, the item that matters most for your purposes, net IRR calculated both with and without the impact of the credit facility. ILPA deliberately didn't mandate one calculation methodology, because none is universally agreed upon across the industry. It mandated transparency about whichever methodology a given GP uses. As Proskauer Rose's summary of the guidance lays out, ILPA's 2020 update expanded the annual disclosure list to 18 separate items, from lead bank and facility term expiration to total fees paid and current use of proceeds.

The regulatory backdrop has tightened further since then. The SEC's Marketing Rule, in effect since November 2022, requires that when a fund manager shows performance metrics calculated with the impact of a subscription facility, it must also show the corresponding metrics with that impact removed, calculated over the same period using the same methodology. In a 2024 client alert, McDermott Will & Emery noted that SEC staff guidance now treats certain older reporting practices, like pairing an unadjusted gross IRR with a facility-adjusted net IRR and simply footnoting the difference, as no longer compliant. ILPA followed with granular template guidance in 2025 spelling out exactly how GPs should present the "with facility" and "without facility" versions side by side, mapping the impact of each transaction type on both. The rules have gotten stricter. That doesn't mean every fund you'll see a pitch deck for is following them, especially smaller or newer managers raising outside institutional channels where nobody is checking their marketing materials against Marketing Rule compliance.

Where sub lines cross the line from cash management to return manufacturing

A subscription line used to smooth capital calls and avoid nickel-and-diming LPs with frequent small draws is a legitimate, low-risk tool. Most large institutional LPs accept it as standard practice. The risk shows up in three specific places, and you should be alert to all three.

First, IRR inflation can mask genuinely slow or weak capital deployment. A GP struggling to find good deals can use a sub line to make early performance look better than it is, buying time and a flattering track record while the actual investment pace lags what was promised in the fund's offering documents. Second, heavy and sustained reliance on a facility, rather than occasional short-term bridging, adds real leverage risk at the fund level. If a facility can't be renewed, or its advance rate gets cut because the LP base's credit quality is reassessed, the GP can face a sudden capital call across the full unfunded balance, all at once, at a time not of your choosing. Third, and most relevant to your specific situation as an individual accredited investor: without the "with and without" disclosure ILPA recommends, you have no way to separate genuine outperformance from timing artifacts when comparing one fund's track record to another's, or to a public market benchmark. A fund showing a 22% net IRR against a public index proxy that returned 14% looks like a clear win. If four to six points of that 22% comes from facility timing, the real gap versus the benchmark is a lot narrower, and the risk-adjusted case for illiquid PE weakens accordingly.

What to actually request before you commit capital

Ask the GP directly, in writing, for net IRR calculated both with and without the impact of the subscription facility, going back through the life of every prior fund in the track record they're showing you, not just the current raise. This is the single highest-value document you can request, and any GP running a well-run shop should have it ready, because ILPA has been asking for exactly this since 2020.

Beyond that first-order document, request:

• The average number of days capital calls are outstanding on the facility, and how that has trended across the fund's life. A rising number suggests growing reliance on the facility rather than occasional bridging.
• The facility's size relative to total fund commitments, its interest rate and fee structure, and whether it's been renewed, downsized, or repriced at any point.
• A cash flow schedule showing the actual dates LP capital was called versus the dates the fund's underlying deals closed. This lets you see the lag directly rather than trusting a summary IRR figure.
• Confirmation of whether marketing materials comply with the SEC Marketing Rule's pairing requirement: gross and net performance calculated over the same period using the same methodology, with facility-adjusted figures paired against unadjusted ones.
• How MOIC compares to IRR-implied outperformance versus peer vintage-year funds. A wide gap between strong IRR rank and mediocre MOIC rank is the pattern worth asking follow-up questions about.

None of this means you should avoid funds that use subscription lines. You'd be avoiding nearly the entire market, per that 94% usage figure. It means you should treat the headline net IRR on a pitch deck the way you'd treat a stock's price without knowing the share count. Ask for the adjusted number, compare MOIC alongside IRR, and verify rather than take the marketing slide at face value.

Author Disclosure: Jeff Barnes, MBA has no personal position in any company, fund, or platform named in this article. Angel Investors Network has no current commercial relationship with any party mentioned. AIN provides marketing and education services, not investment advice. Past performance does not guarantee future results. All investments involve risk, including loss of principal.