4 Variables That Could Affect Your Portfolio This Earnings Season

Over the past few years, a predictable trend has dominated earnings season. Analysts lower their profit forecasts in the weeks and months ahead of quarterly results, and then companies manage to slightly exceed the lowered set of expectations. It's happening again.

According to FactSet Research, on an aggregate basis, analysts lowered Q3 profit forecast by 4.2%, slightly above the typical 2.7% downward revision of the prior 20 quarters. In theory, lowering the bar further should boost the chances that companies manage to exceed current consensus forecasts.

But the typical "cut and beat" game may not be the key theme this time around. As third quarter earnings season gets underway later this week (as Alcoa (NYSE: AA) weighs in on Wednesday, October 8), a range of cross-currents promise to make this one of the more unpredictable earnings seasons in quite some time. Both positive and negative factors are likely to keep analysts and investors on their toes. This is not time to take a casual approach to earnings season. After rising 6% in the first six months of 2013, the S&P 500 rose less than 1% in the third quarter.

Here are four key themes you need to monitor to help get a sense if the S&P 500 can resume its upward trajectory in the fourth quarter:

The Currency Headwind
The U.S. dollar has been rallying sharply since mid-August and now stands near 52-week highs against the euro, the yen, the pound, the Australian dollar and many emerging market currencies. Credit (or blame) goes to an expectation that U.S. economic growth will be relatively more rigorous in 2015, leading to widening interest rate gaps. Currencies anticipate interest rate changes. The strong dollar is bad news for many U.S. multi-nationals, who lose a competitive edge in global markets against foreign competition. At a minimum, profits earned abroad in foreign currencies will be diminished as they are repatriated back into dollars. As a result, Q3 results, along with forward guidance, are bound to be dampened by the currency swings.

If the dollar rallies further in coming months, as many foreign exchange strategists expect, companies may need to reconsider the wisdom of holding so much cash abroad. Firms don't want to take a hit to taxes as cash is brought back home, but those foreign currency holdings are starting to lose value on a weekly basis.

[More from InvestingAnswers.com: Ask The Expert: Is A Shrinking Deficit Good For Stocks And Bonds?]

Good News/Bad News In The Oil Patch
The energy industry is suddenly in flux as crude oil prices move lower. The rising level of domestic production, of both oil and gas, means that many firms will "make it up on volume." But for the energy exploration firms that are focused on hard-to-access energy regions (such as offshore), industry dynamics are changing for the worse, as some energy fields become economically infeasible.