Should You Add Private Equity to Your ISA?

Why It Matters

Retail investors risk substantial wealth loss by loading costly, illiquid private‑equity products into tax‑advantaged ISAs, reshaping the risk profile of a traditionally safe savings vehicle.

Key Takeaways

• IRR overstates private equity returns for retail investors
• Fees consume roughly 10% of gross private equity gains
• Five‑year private equity edge now negative, around –4.6%
• Retail LTAFs add extra 2% annual wrapper costs
• Listed private‑equity stocks outperformed funds by 23%

Pulse Analysis

The allure of private‑equity in an ISA stems from headline‑grabbing internal rate of return figures, yet IRR merely tracks cash‑flow timing, not true compounding. Studies comparing cash‑matched private‑equity funds to the S&P 500 reveal that the sector’s historic premium has vanished, with recent five‑year performance turning negative. This disconnect warns investors that the advertised "superior returns" are largely statistical artifacts rather than sustainable advantages.

Compounding the performance issue is a fee structure that can consume a full tenth of gross returns. Institutional managers charge about 7% annually in management and performance fees, while retail wrappers—distribution, platform, and oversight costs—add another 2‑3%. Open‑ended long‑term asset funds (LTAFs) often embed further charges, pushing total annual costs above 10%. Valuation practices exacerbate risk: recent retail fund transactions have bought stakes at 80% of stated NAV and marked them to 100% the next day, effectively transferring wealth from new investors to incumbents. With the Financial Conduct Authority’s new targeted‑support regime and upcoming ISA cash caps of roughly $15,240, savers may feel pressured into these opaque products despite heightened regulatory scrutiny.

For investors seeking genuine private‑equity exposure, publicly listed private‑equity firms present a more transparent alternative. Over the trailing five years to December 2024, US‑listed private‑equity stocks outperformed their private‑fund counterparts by an average of 23%, offering daily liquidity, clear pricing, and direct exposure to the same fee and carried‑interest dynamics that drive private‑equity profits. By allocating to these equities, savers can capture sector upside without the hidden costs, valuation quirks, or redemption constraints that plague retail private‑equity funds, making it a prudent strategy for ISA‑eligible portfolios.