The Trailing Twelve Months Income Available to Common Stocks (TTMIACS) is defined as income before extraordinary items and discontinued operations less preferred dividends. This data is mainly updated every quarter during the earnings season, with little change in between.
Over the backtest period from 1999 to 2015, there have only been three occurrences when the 10-week moving average TTMIACS moved convincingly below its 40-week moving average. Stocks cannot continue to advance when the income to common stockholders declines. After the signals in May 2001 and Dec. 2007, the market lost 35% and 50%, respectively, and these signals were near the beginning of the respective NBER recessions. The third signal occurred end of Feb. 2015.
In our November 2015 article, we wrote, "According to this indicator a major decline of the stock market should follow." Now we try to answer by how much the S&P 500 is overvalued.
For the period 1/3/2000 to the present, the S&P 500 and the TTMIACS are correlated to 83.5%, which is an extremely high statistical match.
Figure 1 charts SPY and TTMIACS, the latter is scaled so that the error between SPY and a scaled TTMIACS is minimized. On the premise that a fixed ratio between S&P 500 and the TTMIACS exists, the conclusion is reached that the S&P 500 is currently overvalued, as was the case in 2000 prior to the 2001 recession.
Applying this fixed ratio to the current value of the 10wk moving average of TTMIAC indicates a downward potential of the S&P 500 with a possible low of 1660 in the next three months.
Figure 2 details the last 26 months with the earning seasons shaded and charting the weekly changes of TTMIACS and its smoothed components, the vertical relation of the S&P 500 and TTTMIACS for the two charts (Figs.1 and 2) are the same. The latest available data shows that the downward trend of TTMIACS continues, but not as steep as in the past quarters.