There has been some confusion about what adjustments to business income (Sch C or S Corp with 1 100% s/h) need to be made:

1- Sch C 1/2 SE tax (business portion)

2. Any pension contribs by owner/s or s/holder/s

3. Medical insurance paid by owner/s or s/holder/s

4. Q-adjust for any Sec 179 depreciation to 5 year life?????

5. Q- adjust for any Bonus depreciation?????

Without discussing any other nuances, e.g. business vs hobby, active participation in real estate, qualified business occupations, income limits on qualified occupations, limits on taxable income (where qualified income is greater than taxable income).....etc. I am interested in how to adjust income according to the final regs.

Second question is whether anyone is using the proposed regs of 2018 to avoid deducting # 1-5 above?

Thanks for your thoughts.

Bonnie