Corporate profits were outstanding last year, but even the benefit of a 40% cut in the top income-tax rate wasn’t enough to lift the net profit margin back to the all-time high of 10.6% established in early 2012. Still, the latest 10.0% figure is more than a percentage point above the 2007 cycle high and about two points better than any other cycle high.
A massive drop in corporate tax payments lifted the third quarter NIPA profit margin back to the 10% level for the first time four years. But while we try not to always view the glass as half empty, we find it troubling that margins remain well-below their 2012 highs (10.6%) in spite of this one-time windfall.
Analysts are still coming to terms with the impact of the big corporate tax cut, as shown by the dispersion still existing across S&P 500 EPS estimates in 2018. But they should also be watching the line item that’s contributed the most to the breakout in profit margins above historical levels: interest expense...