
Yes, market timing could be a consideration but that assumes you know the exact day when prices are low for you to make your deposits. That's not happening.
Example 1:
Deposit: $5,000 into IRA
Beginning of Year
Average Return: 7%
20 years
Total: $219,325
Example 2:
Deposit: $5,000 into IRA
End of Year
Average Return: 7%
20 years
Total: $204,977
Making deposits at the end of the year versus the beginning of the year is an illustration of an economic term called "opportunity cost." The opportunity cost here is $14,348. To get to the same $219,325 with end of year deposits would require earning an additional .6% each year or saving $350 more each year. Start planning now for 2013.