A subscription line of credit in private equity is a short-term revolving loan a bank extends to a fund, secured not by the fund’s investments but by the contractual promises its limited partners have made to contribute capital when called. The general partner draws on the line to close a deal quickly, then issues a capital call to the investors and uses their money to repay the bank. The facility resets, and the fund can draw again for the next investment.
How the Borrow-and-Call Cycle Works
The cycle begins when the GP identifies a deal and needs cash fast. Rather than sending capital call notices to dozens of LPs and waiting weeks for wires to land, the GP draws on the subscription line. The lending bank funds immediately, and the fund closes the acquisition.
After closing, the GP sends a formal capital call notice to the LPs, who are contractually required to remit their share of committed capital within a window that typically runs 10 to 20 business days. Once that money arrives, the fund uses it to repay the outstanding balance plus accrued interest. The line resets.
The result is a fund that behaves like an all-cash buyer in competitive auctions while its investors keep money working in their own portfolios until a call actually arrives. The GP can also batch several smaller investments into a single, larger capital call rather than issuing frequent small ones. Large institutional LPs managing dozens of fund commitments strongly prefer that predictability.
What Secures the Loan
The collateral is unusual. The lender is not secured by the fund’s portfolio companies, real estate holdings, or any tangible asset. The collateral is the LPs’ legally binding, unfunded capital commitments, meaning their obligation to send money when the GP calls for it.
The fund assigns its right to call capital, and to receive the resulting cash, to the lender through a security agreement. To establish priority over other creditors, the lender files a UCC-1 financing statement, which perfects the security interest under Article 9 of the Uniform Commercial Code.1Legal Information Institute. U.C.C. Article 9 – Secured Transactions Perfection is what makes the claim hold up in a bankruptcy.
Because the collateral is the investors themselves, the lender’s credit analysis focuses almost entirely on the LP base rather than on how the fund’s investments perform. A fund backed by sovereign wealth funds, large pension plans, and university endowments will get a bigger line at a better price than a fund whose investor base is mainly high-net-worth individuals. If the fund defaults, the lender’s perfected interest lets it issue capital calls directly to the LPs, bypassing the GP, and LPs must remit to a lender-controlled account.
How Much a Fund Can Borrow
Lenders do not let a fund borrow against the full value of every commitment. The available credit, called the borrowing base, is built from uncalled commitments of eligible investors after several filters.
Certain LPs are excluded outright. Some governmental entities, tax-sensitive investors, and investors whose partnership agreements restrict pledging their commitments to third parties cannot be part of the collateral pool. These excluded investors shrink the base before anything else happens.
Each remaining LP’s commitment is then multiplied by an advance rate that reflects the lender’s view of that investor’s credit quality. Highly rated institutional investors might receive advance rates around 90%, while high-net-worth individuals might see rates closer to 40%. Funds with a mix of investor types often use tiered structures: for example, 90% for the strongest-rated LPs, 65% for a middle tier, and 40% for individuals. Funds using a single flat advance rate across all investors typically land between 60% and 70%.
Lenders also impose concentration limits to avoid overexposure to any single investor. A common cap holds any individual LP to no more than 5% of the total borrowing base. Aggregate limits apply too, with all investors in a particular class sometimes capped at 40% collectively. Around 70% of subscription facilities for commingled funds use some form of individual investor concentration limit.
What It Costs
Subscription lines are priced as a floating rate over a benchmark. Since the transition away from LIBOR, that benchmark is virtually always Term SOFR, the Secured Overnight Financing Rate. The spread over SOFR is negotiated based primarily on the credit quality of the LP base and has compressed in recent years. Margins that once exceeded 200 basis points now frequently come in below that for well-regarded sponsors.
Beyond the interest on drawn amounts, the fund pays two main fees. An upfront arrangement fee, typically 10 to 50 basis points of the total facility size, covers the lender’s structuring and syndication costs. An ongoing unused commitment fee, usually 10 to 25 basis points, compensates the lending syndicate for keeping capital available that the fund has not yet drawn. All of these are partnership expenses, so they are ultimately borne by the LPs.
Why Funds Use Them
Speed is the headline benefit. In competitive processes, the ability to wire funds within days rather than waiting three weeks for LP capital can be the difference between winning and losing a deal. Sellers and their advisors know which buyers can close fast, and certainty of execution matters almost as much as price.
Operational benefits compound. Batching capital calls means fewer wire instructions, fewer compliance checks, and fewer disruptions to LP treasury operations. For a pension fund juggling commitments to 30 or 40 private equity funds, receiving four capital calls a year instead of twelve from a single fund is genuinely meaningful.
LPs also gain extended investment time. Capital they have committed to the fund keeps earning returns in their own portfolios until the call arrives. A large endowment keeping $50 million in short-term treasuries rather than wiring it to a fund two months earlier captures real value from that delay.
The Effect on Reported IRR
The most debated consequence of subscription lines is their effect on a fund’s reported internal rate of return. IRR is time-weighted; it measures annualized return against how long capital was actually deployed. When a subscription line bridges the gap between a deal closing and the LP capital call, the clock on LP capital starts later. The investment return stays the same, but the measured time period shrinks. The result is a higher IRR, sometimes substantially so.
This is not a secret and not fraud, but it complicates performance comparisons. A fund reporting a 20% net IRR with heavy subscription line usage might show a 16% IRR without the line: same investments, same cash-on-cash returns, just different timing of when LP capital was technically at work. The multiple on invested capital, which simply divides total distributions by total contributions, actually decreases slightly because interest expense on the line is a real cost.
The industry has moved toward dual reporting. In 2023, the SEC adopted rules that would have required advisers to illiquid funds to present performance both with and without subscription facility effects.2Securities and Exchange Commission. Private Fund Advisers; Documentation of Registered Investment Adviser Compliance Reviews The Fifth Circuit fully vacated those rules in 2024, finding the SEC had exceeded its statutory authority. Despite that, dual reporting is now widespread as a market practice. The Institutional Limited Partners Association (ILPA) has long recommended that GPs disclose both levered and unlevered IRR, and most institutional LPs now demand it as a condition of investment.
Risks Worth Knowing
Subscription lines are not free money. The most straightforward risk is cost drag. Upfront fees, commitment fees, and interest on drawn amounts all reduce net returns. When underlying investments perform well, the IRR benefit from compressed deployment time more than offsets these costs. When investments disappoint, the line’s expenses make a bad outcome worse. Interest cost can nullify any IRR benefit while also reducing the fund’s MOIC.
The compressed J-curve creates a subtler problem around carried interest. Most funds pay the GP a performance fee only after exceeding a preferred return hurdle, typically 8% IRR. When subscription line usage inflates the measured IRR, the fund may cross that hurdle earlier than it would have on an unlevered basis. If later investments underperform, the GP may need to return carry paid prematurely, triggering a clawback. This timing mismatch is one of the reasons ILPA has pushed for unlevered reporting.
Using subscription lines to fund LP distributions, rather than investments, is especially contested. ILPA has explicitly cautioned managers against drawing on these facilities to accelerate distributions before a portfolio company exit actually closes. The practice creates the appearance of strong cash-on-cash returns while increasing fund-level debt, and it can mask deterioration in the underlying portfolio.
In a default, LPs face the prospect of a lender issuing capital calls directly to them. The LP’s total exposure is still capped at its unfunded commitment, but having a bank rather than the GP demand the money, potentially at an inconvenient moment and for the purpose of repaying debt rather than funding investments, is not what most investors signed up for.
Tax Exposure for Tax-Exempt Investors
Tax-exempt LPs, including pension funds, endowments, foundations, and charitable organizations, face a specific risk that taxable investors do not. When a fund borrows through a subscription line, the resulting income can be treated as debt-financed income under the Internal Revenue Code, which triggers unrelated business taxable income (UBTI) for tax-exempt partners.3Office of the Law Revision Counsel. 26 U.S. Code 514 – Unrelated Debt-Financed Income
The concern centers on how long the debt stays outstanding. Traditionally, subscription lines were cleared every 90 days specifically to minimize UBTI exposure. As facilities have evolved into broader cash management tools with repayment terms extending well beyond 90 days, sometimes to a year or more, UBTI risk has grown. A tax-exempt LP whose fund holds investments partly financed by outstanding subscription line debt may owe tax on a proportionate share of the income those investments generate, even though the LP is otherwise exempt from federal income tax.
The math under Section 514 is proportional. The taxable percentage of income from a debt-financed property equals the ratio of average outstanding debt to average adjusted basis of the property. In practice, a fund that draws on its line to acquire an investment and repays within a few weeks creates minimal UBTI exposure. A fund that leaves the line outstanding for months while earning income on the acquired asset creates a much larger problem.
Tax-exempt LPs should pay close attention to a fund’s subscription line policies during due diligence. The critical questions are how long draws typically remain outstanding, whether the GP commits to clearing the line within 90 days, and whether the LPA addresses UBTI mitigation explicitly. Some funds offer UBTI-blocker structures or side letter protections, but these are negotiated, not guaranteed.
How Facility Duration Has Changed
Subscription lines were originally short-term instruments with maturities under one year, typically cleared within 90 days. That traditional structure reflected both the bridging purpose of the facility and the tax concerns of tax-exempt investors. Over the past decade, particularly in the low-interest-rate environment following the 2008 financial crisis, these facilities have evolved. Maturities now commonly reach one year and sometimes extend beyond that, and repayment cycles have lengthened.
The shift matters because longer-outstanding borrowings change the economic character of the facility. A line repaid within a few weeks of each draw is genuinely bridging the capital call process. A line that remains drawn for six months or longer starts to look more like leverage: the fund is earning investment returns on borrowed money for an extended period. That distinction affects IRR calculations, fee costs, UBTI exposure, and the overall risk profile of the fund. When evaluating a fund’s subscription line practices, the duration of typical draws tells you more about how the facility is being used than the stated maturity of the credit agreement.