The latest earnings release from Rigel Pharmaceuticals, Inc. (NASDAQ:RIGL ) disappointed investors. We did some digging and found some underlying numbers that are worrying.

Examining Cashflow Against Rigel Pharmaceuticals' Earnings

In high finance, the key ratio used to measure how well a company converts reported profits into free cash flow (FCF) is the accrual ratio (from cashflow). To get the accrual ratio we first subtract FCF from profit for a period, and then divide that number by the average operating assets for the period. This ratio tells us how much of a company's profit is not backed by free cashflow.

That means a negative accrual ratio is a good thing, because it shows that the company is bringing in more free cash flow than its profit would suggest. That is not intended to imply we should worry about a positive accrual ratio, but it's worth noting where the accrual ratio is rather high. To quote a 2014 paper by Lewellen and Resutek, "firms with higher accruals tend to be less profitable in the future".

For the year to March 2026, Rigel Pharmaceuticals had an accrual ratio of 1.68. Ergo, its free cash flow is significantly weaker than its profit. As a general rule, that bodes poorly for future profitability. To wit, it produced free cash flow of US$79m during the period, falling well short of its reported profit of US$364.2m. We note, however, that Rigel Pharmaceuticals grew its free cash flow over the last year. However, as we will discuss below, we can see that the company's accrual ratio has been impacted by its tax situation. This would certainly have contributed to the weak cash conversion.

That might leave you wondering what analysts are forecasting in terms of future profitability. Luckily, you can click here to see an interactive graph depicting future profitability, based on their estimates.

An Unusual Tax Situation

In addition to the notable accrual ratio, we can see that Rigel Pharmaceuticals received a tax benefit of US$242m. This is meaningful because companies usually pay tax rather than receive tax benefits. Of course, prima facie it's great to receive a tax benefit. However, the devil in the detail is that these kind of benefits only impact in the year they are booked, and are often one-off in nature. In the likely event the tax benefit is not repeated, we'd expect to see its statutory profit levels drop, at least in the absence of strong growth. While we think it's good that the company has booked a tax benefit, it does mean that there's every chance the statutory profit will come in a lot higher than it would be if the income was adjusted for one-off factors.

Our Take On Rigel Pharmaceuticals' Profit Performance

Rigel Pharmaceuticals' accrual ratio indicates weak cashflow relative to earnings, which perhaps arises in part from the tax benefit it received this year. On top of that, the unsustainable nature of tax benefits mean that there's a chance profit may be lower next year, certainly in the absence of strong growth. On reflection, the above-mentioned factors give us the strong impression that Rigel Pharmaceuticals'underlying earnings power is not as good as it might seem, based on the statutory profit numbers. With this in mind, we wouldn't consider investing in a stock unless we had a thorough understanding of the risks.

Our examination of Rigel Pharmaceuticals has focussed on certain factors that can make its earnings look better than they are. And, on that basis, we are somewhat skeptical. But there is always more to discover if you are capable of focussing your mind on minutiae. Some people consider a high return on equity to be a good sign of a quality business. So you may wish to see this free collection of companies boasting high return on equity, or this list of stocks with high insider ownership.

This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.