Every year brings some financial change, and 2012 is no exception. Here are some relevant changes relating to investment, tax and estate planning for this year. Retirement Plans. Annual limits for 401(k), 403(b) and 457 contributions rise slightly to $17,000, and you can contribute an additional $5,500 to these accounts if you are 50 or older this year. IRA contribution levels are unchanged from 2011: The ceiling is $5,000, $6,000 if you will be 50 or older in 2012.

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