Maximize your retirement plan contributions. If you own an incorporated or unincorporated business, consider setting up a retirement plan if you don’t already have one. (It doesn’t need to actually be funded until you pay your taxes, but allowable contributions will be deductible on this year’s return.)
If you are an employee and your employer has a 401(k), contribute the maximum amount ($16,500 for 2011 and $17,000 for 2012, plus an additional catch up contribution of $5,500 if age 50 or over, assuming the plan allows this much and income restrictions don’t apply).
If you are employed or self-employed with no retirement plan, you can make a deductible contribution of up to $5,000 a year to a traditional IRA (deduction is sometimes allowed even if you have a plan). Further, there is also an additional catch up contribution of $1,000 if age 50 or over.