Thanks so much for the responses thus far...still confused...maybe more info will help?
The only reason the business is bifurcated between a C and F is due to IRS regulations. There is a single EIN and any financial reporting (other than on the income tax return) combines the C and F financial information to reflect the vertical integration of the business (including any potential financing or sale of the enterprise).
In the case of the DB plan, the contribution was historically calculated on an annual average net income of approximately $300k of C net income (and the exclusion of an annual average net loss of approximately $150k of F net loss). Now, a new calculation is being made each year on an annual average net income of approximately $150k of C and F net income combined together to reflect the true economics of the business entity.
My thought is this will cause major problems with the historical contribution and deductible amounts...In other words, extreme excess contributions and deductions in the tax return greater than should have occurred....
Hope this helps!!!