A lackluster earnings announcement from Alliant Energy Corporation (NASDAQ:LNT) last week didn't sink the stock price. Our analysis suggests that along with soft profit numbers, investors should be aware of some other underlying weaknesses in the numbers.

View our latest analysis for Alliant Energy

An Unusual Tax Situation

Alliant Energy reported a tax benefit of US$103m, which is well worth noting. 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, our data indicates that tax benefits can temporarily boost statutory profit in the year it is booked, but subsequently profit may fall back. Assuming the tax benefit is not repeated every year, we could see its profitability drop noticeably, all else being equal. 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.

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.

Our Take On Alliant Energy's Profit Performance

As we have already discussed Alliant Energy reported that it received a tax benefit, rather than paying tax, in the last year. As a result we don't think its profit result, which includes that tax-boost, is a good guide to its sustainable profit levels. Therefore, it seems possible to us that Alliant Energy's true underlying earnings power is actually less than its statutory profit. Sadly, its EPS was down over the last twelve months. The goal of this article has been to assess how well we can rely on the statutory earnings to reflect the company's potential, but there is plenty more to consider. With this in mind, we wouldn't consider investing in a stock unless we had a thorough understanding of the risks. Case in point: We've spotted 2 warning signs for Alliant Energy you should be mindful of and 1 of them shouldn't be ignored.

Today we've zoomed in on a single data point to better understand the nature of Alliant Energy's profit. 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. While it might take a little research on your behalf, you may find this free collection of companies boasting high return on equity, or this list of stocks with significant insider holdings to be useful.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.

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.