How Do Fund Subscription Lines Inflate the IRR I’m Shown as an LP?

You’re reviewing two venture funds: One reports a 28% net IRR, while the other reports 23%.

The first fund appears to be the obvious choice.

Then you discover that it relied heavily on a subscription line of credit before calling capital from investors.

Now you’re wondering whether the higher IRR actually reflects better investment performance.

It’s an important question.

A subscription line can increase a fund’s reported IRR without changing the underlying investment results. Understanding how this works helps limited partners compare funds more accurately and avoid relying too heavily on a single performance metric.

What Is a Subscription Line?

A subscription line is a short-term credit facility used by a venture capital or private equity fund.

Instead of immediately calling capital from limited partners, the general partner temporarily borrows money from a bank to complete investments. The LP capital is called later to repay the borrowing.

Subscription lines are commonly used to simplify capital calls and provide operational flexibility.

However, they also affect how certain performance metrics are calculated.

Why Subscription Lines Increase IRR

Internal Rate of Return (IRR) is highly sensitive to timing.

The later investor capital is contributed and the sooner distributions are received, the higher the reported IRR tends to be.

When a subscription line finances an investment first and investor capital is called several months later, the measured investment period becomes shorter even though the underlying investment has not changed.

As a result, the reported IRR may increase without generating additional value for limited partners.

Don’t Evaluate a Fund Using IRR Alone

IRR is an important metric, but it should always be considered alongside other measures of fund performance.

Three of the most useful metrics are:

• DPI (Distributions to Paid-In Capital): Measures the actual cash returned to investors compared with the capital they contributed.
• TVPI (Total Value to Paid-In Capital): Measures both realized and unrealized value relative to invested capital.
• RVPI (Residual Value to Paid-In Capital): Measures the unrealized value that remains invested in the portfolio.

Together, these metrics provide a more complete picture of fund performance than IRR alone.

Subscription Lines Also Affect Costs

The impact of a subscription line extends beyond performance reporting. Borrowing through a credit facility creates financing costs.

Although investor capital may remain uncalled for a longer period, the fund generally incurs borrowing expenses that ultimately affect fund economics.

Founders and LPs should understand:

• How long the facility is typically used.
• The associated borrowing costs.
• Whether management fees are affected by delayed capital calls.

These details provide useful context when evaluating overall fund performance.

Compare Funds Using Consistent Assumptions

Comparing funds becomes difficult when one relies extensively on subscription lines and another does not.

ILPA’s 2025 reporting template, adopted for funds beginning in 2026, encourages general partners to disclose IRR both with and without the subscription line.

Reviewing both figures allows investors to distinguish between investment performance and the effects of financing structure.

This creates a much fairer basis for comparing competing funds.

Ask Questions Before Committing Capital

Performance numbers are only one part of fund due diligence. Before investing, LPs should understand:

• Whether a subscription line is used.
• How long capital calls are typically delayed.
• The effect on reported IRR.
• The relationship between IRR, DPI, and TVPI.
• The borrowing costs associated with the facility.

These discussions often provide better insight into fund performance than relying on a single headline return.

Common Founder Mistakes

• Comparing funds using only headline IRR: Subscription lines can increase reported IRR without improving the underlying investment performance, making direct comparisons misleading.
• Ignoring DPI, TVPI, and RVPI: Cash distributions and total value often provide a more balanced assessment of fund performance than IRR alone.
• Not asking whether IRR is reported with or without a subscription line: Reviewing both calculations helps distinguish genuine investment performance from timing effects created by borrowing.
• Overlooking the cost of the subscription facility: Delayed capital calls may improve reported IRR, but borrowing costs and fee implications still affect the fund’s overall economics.

10-Minute Fund Performance Self Check

• Does this fund use a subscription line?
• Have I reviewed IRR both with and without the subscription facility?
• What are the fund’s DPI, TVPI, and RVPI?
• How long are capital calls typically delayed?
• What borrowing costs does the subscription line create?
• Am I comparing every fund using the same performance assumptions?

If you cannot answer yes to all of these, you are not ready to allocate off that IRR yet.

Bottom Line

Subscription lines are a common financing tool that can improve reported IRR by delaying investor capital calls. While they may provide operational benefits, they do not automatically increase the underlying value created by the fund. Limited partners should evaluate IRR alongside DPI, TVPI, RVPI, borrowing costs, and line-adjusted performance before making investment decisions.

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