Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Self-employed individual 401k self, match, and profit sharing contribution limits?
It seems I can make contributions as employee-elective, employer   match, or profit sharing; yet they all end up in the same 401k from my   money since I'm both the employer and employee in this situation. Correct. What does this mean for my allowed limits for each of the 3 types of   contributions? Are all 3 types deductible? "Deductible"? Nothing is deductible. First you need to calculate your "compensation". According to the IRS, it is this: compensation is your “earned income,” which is defined as net earnings   from self-employment after deducting both: So assuming (numbers for example, not real numbers) your business netted $30, and $500 is the SE tax (half). You contributed $17.5 (max) for yourself. Your compensation is thus 30-17.5-0.5=12. Your business can contribute up to 25% of that on your behalf, i.e.: $4K. Total that you can contribute in such a scenario is $21.5K. Whatever is contributed to a regular 401k is deferred, i.e.: excluded from income for the current year and taxed when you withdraw it from 401k (not "deducted" - deferred).