My December investment income rose to $90.93 from $89.13 the month before. This was all the result of gains in my investment portfolio as I did not invest any additional money in December. There will probably not be any additional investments made for the next few months, other than reinvested dividends, as I am trying to rebuild my cash after a couple of large purchases at the end of 2009.
Disclaimer: This is not my actual investment income. To get this figure I first add up my retirement savings, emergency fund, and any other money I consider permanent savings. What the total of my savings would earn at 6% interest for a month is my monthly investment income. My goal is to get this amount to $1000 a month. If I have $1000 in monthly passive investment income I will be able to retire early.