LKnomad – You’re asking good, reasonable questions. Unfortunately, Profile schools can each make choices about how to interpret the business information you provide on Profile, the business supplement (only requested by some schools), and what they take from your tax returns, including business tax returns.
In general, schools that use Profile will look at your income as a business owner as being the income you report on the 1040 line 12, and they will add to that the amounts you report on lines 24,25,27,28, 29, 32. To that total they will probably add the values from your Schedule C for lines 12, 13, 30. It is possible that they might look at the detail in Part V, other expenses, and add back some of that, but it is harder to predict.
So, from an income standpoint, you can make a pretty good guess if you use your 2014 tax return and add up those items. (Obviously, if either of you also has wage income from another job, or interest/dividend/capital gains income, that will also need to be added.)
FAFSA-only schools will not consider the value of the plumbing business, as long as you do not employ a plethora of plumbers. (I can’t remember whether it is 100 or more or more than 100 employees, but it is far above the number employees found in most businesses.)
Profile schools will ask you to value the business. The question is, how much could you sell the plumbing business for in a quick, cash sale? So, you have assets, which include cash-on-hand, plumbing fixtures, truck(s), tools, equipment. You have a customer list. You presumably have contacts in the industry to figure out how much of plumbing business like yours would sell for. It is usually a smaller value than you’d like unless the business owns real estate. Sometimes a business broker might be able to give you an estimate, or there might be a similar plumbing business for sale in your town/city/market. I would not spend a huge amount of time trying to value the business. If it takes more than an hour, you’re overthinking it. Colleges understand that businesses need working capital. If some of the cash-on-hand represents deposits from customers, the balance sheet should show that as a deposits from customers, not as cash freely available to you. In the same way, a lawyer’s trust account isn’t properly part of the value of a legal practice, and customer deposits in checking accounts aren’t part of a bank’s value.