Retirement savers who believe they have dodged Wall Street's fee machine by opening a "zero-fee" individual retirement account may be paying more than they think, according to a new white paper from PensionBee, an online retirement provider. The report, released this week, identifies six revenue mechanisms embedded in supposedly free IRAs that rarely appear on account statements, a finding that arrives as IRA balances swell to record levels.
Applying its analysis to a $107,000 IRA balance—roughly the median retirement savings for Millennial and Gen X households—PensionBee found that even a cost-optimized account carries hidden annual charges of 0.16% to 0.32% of assets, or $160 to $340 per year. However, for savers who exhibit typical behavior, such as holding cash or choosing actively managed funds, the effective cost climbs to about 1.3% annually, or roughly $1,400 a year.
Six hidden costs inside 'zero-fee' IRAs
The most expensive pitfall identified in the report stems from a hypothetical saver unknowingly selecting an actively managed fund over a comparable low-cost index fund within a "zero-fee" account. Over a 30-year horizon, assuming a 7% annual return, that single decision can drain more than $170,000 from a retirement balance. The report also flags cash sweep spreads, where idle cash sits in low-yield accounts while the platform pockets most of the interest, and securities lending, which allows providers to loan a saver's holdings to institutional borrowers, collecting fees while the saver bears the risk.
Payment for order flow—an arrangement where trades are routed through a middleman rather than a transparent exchange—also comes under scrutiny. The study notes that actively managed funds charging nearly nine times as much as comparable index funds can still be offered within "zero-fee" products. Additional charges may lurk in wire transfers, fund transfers, or foreign exchange conversions, as well as in fine print that limits "zero-fee" pricing to certain balances or pairs it with costlier advisory tiers that are easy to opt into accidentally.
Rollover traps and financial literacy gaps
The research lands as IRA balances grow industry-wide. Investment Company Institute data shows IRAs held approximately $19.2 trillion by the end of 2025, nearly double the assets in workplace 401(k) plans, a shift driven largely by rollovers rather than annual contributions. That growth means a widening pool of savers are encountering IRA fee structures for the first time, often without the tools to evaluate them. PensionBee points to a separate finding that a substantial share of IRAs remain parked in cash for years following a rollover, leaving that money exposed to potential erosion from cash sweep spreads.
The knowledge gap compounding the problem is well documented by the Government Accountability Office, which reported that 40% of Americans do not fully understand their 401(k) fee disclosures, and 41% are unaware they pay any fees at all. "Retirement fees are already difficult to understand, even without 'zero-fee' marketing," said Romi Savova, founder and chief executive of PensionBee. "Our findings suggest that this practice rewards financial expertise and penalizes a lack of it, meaning the saver least equipped to catch hidden fees may pay the most."
For financial advisors, the study underscores the importance of transparent fee discussions, particularly as clients roll over 401(k) balances into IRAs. Advisors can help clients navigate the fine print of "zero-fee" products and steer them toward low-cost index funds, potentially saving tens of thousands of dollars over a career. As the retirement landscape evolves, outsourcing investment management may also help advisors focus on holistic planning, but fee transparency remains a cornerstone of client trust.
With IRAs now holding nearly double the assets of 401(k) plans, the stakes are high. Savers who fail to scrutinize their statements may be losing hundreds of dollars annually without realizing it. The PensionBee report serves as a reminder that "zero" often comes with an asterisk, and that the true cost of an IRA depends on the choices made within it.
