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For incorporated business owners, Individual(k) plan contributions will generally be based on the business owner's Form W-2. However, incorporated business owners should be sure to reference the definition of compensation within their plan documents as the exact definition of compensation can vary slightly from one plan document to the next. Recall that the maximum Individual(k) plan contribution is comprised of two components: an employer profit sharing contribution and an employee salary deferral contribution. (Note: Owners of Subchapter S corporations must base their contributions on Form W-2 income and may not base Individual(k) plan contributions on pass through profits.)

Once the incorporated business owner's wages are determined (or estimated in the case of advance planning), the maximum Individual(k) plan contribution may be determined as follows.

Step 1: Determine Maximum Profit Sharing Contribution

Maximum Profit Sharing Contribution = .25 x Total Wages*

Step 2: Determine Maximum Salary Deferral

Maximum Salary Deferral = Lesser of Annual Maximum Deferral Limit, plus Catch-Up Contributions, if eligible** or Total Wages

Step 3: Calculate Maximum Individual(k) Plan Contribution

Max. Individual(k) Plan Contribution = Max. Profit Sharing Contribution + Max. Salary Deferral

Note: The maximum Individual(k) plan contribution may not exceed $46,000 (exclusive of any "catch-up" contributions) or 100% of Total Wages.

*For 2008, the maximum amount of wages that may be used for determining plan contributions is $230,000.
** Individuals who are age 50 or older during the year are eligible for an additional catch-up contribution. For 2008, the annual maximum deferral limit is $15,500, and the catch-up contribution limit is $5,000.

Example:

John Tanner is the sole owner and employee of, Tanner Roofing, a Subchapter S corporation. Based on his tax advisor's recommendation, John intends to draw a salary of $50,000 (Form W-2 wages) from the company during 2008. Based on estimated Social Security wages of $50,000 during 2008, John's maximum Individual(k) plan contribution for 2008 would be calculated as follows.

Step 1: Determine Maximum Profit Sharing Contribution

  • Maximum Profit Sharing Contribution = .25 x Total Wages
  • Maximum Profit Sharing Contribution = .25 x $50,000
  • Maximum Profit Sharing Contribution = $12,500

Step 2: Determine Maximum Salary Deferral

  • Maximum Salary Deferral = Lesser of $15,500 plus catch-up contributions, if eligible or Total Wages
  • Maximum Salary Deferral = $15,500

Step 3: Calculate Maximum Individual(k) Plan Contribution

  • Max. Individual(k) Plan Contribution = Max. Profit Sharing Contribution + Maximum Salary Deferral
  • Max. Individual(k) Plan Contribution = $12,500 + $15,500
  • Max. Individual(k) Plan Contribution = $28,000

Based on estimated W-2 wages of $50,000 for 2008, John could contribute up to $28,000 to an Individual(k) plan for 2008. In addition, if John were age 50 or older in 2008, he would qualify for a catch-up contribution of $5,000 in the form of a salary deferral contribution, thereby bringing his maximum contribution amount up to $33,000.

Note: Because salary deferral contributions may not be made with respect to compensation that has already been paid, John must make a written salary deferral election prior to the time he receives his compensation from the company.

*For 2008, the maximum amount of wages that may be used for determining plan contributions is $230,000
** Individuals who are age 50 or older during the year are eligible for an additional catch-up contribution. For 2008, the annual maximum deferral limit is $15,500, and the catch-up contribution limit is $5,000.