If you are self-employed (a sole proprietor or a working partner in a partnership or limited liability company), you must use a special rule to calculate retirement plan contributions for yourself.
Retirement plan contributions are often calculated based on participant compensation. For example, you might decide to contribute 10% of each participant's compensation to your SEP plan. This formula works to determine employees' allocations, but your own contributions are more complicated. You can't simply multiply your net profit on Schedule C by 10%.
You calculate self-employment (SE) tax using the amount of your net earnings from self-employment and following the instructions on Schedule SE, Self-Employment Tax. However, you must make adjustments to your net earnings from self-employment to arrive at the amount of "plan compensation" to use to determine the plan contribution/deduction for yourself.
Plan compensation for a self-employed individual
To calculate your plan compensation, you reduce your net earnings from self-employment by:
Note that your plan compensation and the amount of your own plan contribution/deduction depend on each other - to compute one, you need the other (this is a circular calculation). One way to do this is to use a reduced plan contribution rate. You can use the Table and Worksheets for the Self-Employed (Publication 560) to find the reduced plan contribution rate to calculate the plan contribution and deduction for yourself.
Deducting retirement plan contributions
Total limits on plan contributions depend in part on your plan type. See the contribution limits for your plan.
A limit applies to the amount of annual compensation you can take into account for determining retirement plan contributions. This limit is $265,000 in 2015 and 2016 and is adjusted annually.
Plan contributions for a self-employed individual are deducted on Form 1040 (on the line for self-employed SEP, SIMPLE, and qualified plans) and not on the Schedule C. If you made the deduction on Schedule C, or made and deducted more than your allowed plan contribution for yourself, you must amend your Form 1040 tax return and Schedule C.
You should amend your Form 1040 tax return and Schedule C if you:
Joe, a Schedule C sole proprietor, will have $100,000 net profit on his 2014 Schedule C (after deducting all Schedule C expenses, including a 10% retirement plan contribution made for his common-law employees but not his own contribution). Joe must pay $14,130 in SE taxes. To compute his plan compensation, Joe must subtract from his net profit of $100,000:
Alternatively, Joe can compute his reduced plan contribution rate by:
1 Taking the plan contribution rate10%
2 Dividing the plan contribution rate by 100% + plan contribution rate10%/110%
3 To get the reduced plan contribution rate 9.0909%
Joe can now compute his own contribution/deduction amount as follows:
1 $100,000Schedule C net profit
2 $7,065½ SE tax deduction ($14,130 x ½)
3 $92,935Net profit reduced by ½ SE tax
4x9.0909%Joe’s reduced plan contribution rate
5=$8,449Joe’s allowed contribution and deduction
There is simple way to quickly verify the accuracy of Joe’s contribution/deduction amount:
1 $100,000Joe's Schedule C net profit
2-$7,065½ SE tax deduction
3-$8,449Joe's contribution/deduction for himself
4=$84,486Amount subject to plan's full rate
5x10%Plan's full rate
6=$8,449Joe's contribution/deduction for himselfIf lines 3 and 6 above match, the contribution/deduction calculation is correct.