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Hi and welcome to Just Answer!To avoid 10% additional tax on early distributions - you need to be 59 1/2 at the time of distribution.If you take the distribution before reaching age 59 1/2 - that distribution will be subject of 10% additional tax even you reach age 59 1/2 in the year of distribution.
Here is a reference to the statute - http://www.law.cornell.edu/uscode/usc_sec_26_00000072----000-.html (t) 10-percent additional tax on early distributions from qualified retirement plans
...There are certain exceptions to this additional tax - http://www.irs.gov/taxtopics/tc557.html - you may verify if any may be used in your situation.Let me know if you need any help or clarification or have other tax related issues.