Don't overlook these!
Updated for 2011
With a qualified plan, you can make deductible contributions for a tax year up to the due date of your return (plus extensions) for that year if the plan was established by the end of the year for which you want to deduction to apply.
For example, if you want to make deductible contributions for 2011 (assuming you're on a calendar year) you can make the contributions as late as the due date of your return, April 17, 2012 (plus extensions) provided the qualified plan was established no later than December 31, 2011.
Your promissory note made out to the plan is not a payment that qualifies for the deduction.
In addition, issuing such a note is a prohibited transaction.
Qualified Plans: One-Person 401(k) Plan; Overall Annual Contribution Limit
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