HSA Contributions Changes and the Last Month Rule

Q. How much can an individual contribute if she’s HSA eligible all year but changes from self-only to family coverage after her May 18, 2011, wedding?

 A. This individual can take one of two approaches. 

General Rule: “Sum of the Monthly Contribution Limits Rule.” Accountholders’ annual HSA contributions are pro-rated based on the number of months they are HSA eligible under each contract type during the year. When this individual is enrolled in a self-only contract, she can contribute $254.17 per month (the statutory maximum annual contribution of $3,050 divided by 12 months). During the months that she is enrolled on a family contract, she can contribute $512.50 per month (the $6,150 statutory maximum annual contribution divided by 12 months). In this case, her month-by-month maximum contribution is as follows:

 Month Maximum Contribution
January $254.17
February $254.17
March $254.17
April $254.17
May $254.17
June $512.50
July $512.50
August $512.50
September $512.50
October $512.50
November $512.50
December $512.50
Total $4,858.33

 

 

Special Rule: “Last-Month Rule.” This special rule (which comes with a testing period requirement noted below) permits the individual to make a full year’s family contribution as long as she is enrolled in a family contract as of Dec. 1, 2011, regardless of when during the first 11 months of 2011 she is married and switches to a family contract. If she takes this approach, she must remain eligible through the end of the following 12-month “testing period.” The testing period ends on December 31 of the following year (2012 in the above example). If she loses HSA eligibility any time before December 31, 2012, she must include any contributions for months during which they were not eligible, except for the last-month rule, in her taxable income in the year she loses eligibility. In addition, excess contributions are subject to a 10% additional tax that year. Accountholders incur this penalty regardless of age.

If she loses HSA eligibility during the testing period, she must include in her 2012 taxable income any contribution she made in 2011 that is in excess of the pro-rated contribution maximum. Her maximum contribution would be $4,858.33, and any amount above that figure would be included in her 2012 taxable income, and she would pay an additional 10% tax on the excess contribution as well.

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