.webp)
Zero is a very good number.
No platform charges. No trading commissions. No management fees. Over the last decade, the financial services industry has made zero the headline, the selling point, and increasingly the standard. If you opened an IRA recently, or are thinking about it, there's a good chance that "free" played a role in your decision.
Here's the thing: the revenue didn't disappear. It moved.
In a new report, The True Cost of "Zero", PensionBee commissioned an independent actuary and forensic financial analyst to reverse-engineer how "zero fee" platforms actually make money. What came back wasn't a simple answer. It was five overlapping charging mechanisms, each one legal, each disclosed somewhere in documents most people will never read, and none of them visible on a statement.
What Zero Actually Costs
The analysis modeled a representative saver with $107,000 in retirement savings and 20 years until retirement. That's close to the median IRA balance for a Gen X saver.
Under the most favorable assumptions possible, including the right fund choices and the selection of the lowest-cost options throughout, zero-fee platforms still extracted a minimum of 0.16%-0.32% per year. That amounts to between $166 and $342 annually on that account, charged invisibly.
Make a few of the mistakes that many ordinary savers make, and the gap between expected and actual costs can widen quickly. Under realistic assumptions, investors could end up paying the equivalent of 1.6% per year despite assuming the platform costs 0%.
That is roughly $1,700 annually on the same $107,000 account. The cost may be disclosed somewhere in the paperwork, but it is not always easy to spot and can be buried within disclosures rather than presented as a simple annual fee.
Here's where it goes:
The Five Places Your Money Goes
1. Cash Sweep Spreads: How Your Idle Cash Earns Them Money Instead of You
When you have uninvested cash sitting in your IRA, such as between contributions, during a rollover, or when it is otherwise idle, the platform typically sweeps it into interest-bearing accounts. The platform earns a return on that cash, while you may receive only a fraction of it.
This is a cash sweep.
The analysis found one provider earning a net spread of approximately 3% on swept cash. The bank pays 4–5% on this cash but passes along close to zero to customers. On a $107,000 account where cash represents 10% of the balance, that invisible spread costs roughly $261 per year. EBRI (Employee Benefit Research Institute) reports that nearly 24% of IRAs are heavily allocated in cash. Platforms that don't automatically invest your contributions have a structural reason to let that cash sit idle. Idle cash pays them, not you.
2. Securities Lending: How Your Holdings Get Rented Out
Stocks and bonds held in your account can be lent out to large institutions, who pay a fee to borrow them. Some platforms share that fee with you. Others keep most of it. One provider in the analysis retains an estimated 85% of net lending fees from its opt-in program, passing along 15% to clients. The platform also captures the full interest earned on the borrower's collateral. The risk of something going wrong, such as a borrower defaulting or collateral losing value, falls on you rather than the provider.
3. Your Payment for Order Flow: How Your Orders Get Sold
When you buy or sell investments inside your account, you may pay an indirect cost through the way your trade is executed. Some brokers don't necessarily send your order to the market offering the best available price. Instead, they route it to a market maker that pays the broker for the order and then executes the trade at a slightly less favorable price, keeping the difference. This practice, known as Payment for Order Flow (PFOF), can increase your trading costs even though it doesn't appear as a separate fee on your account statement. The practice has been banned in the UK and restricted across much of Europe because it creates a conflict of interest. Even so, it remains legal in the U.S.
