all of this is similar to a business owned by one spouse before the marriage--> if the business appreciates during the marriage due to the effort and investments of the community, the community is entitled to the business appreciation.
This statement is so imprecise so as to be meaningless. There is substantial case law regarding these issues and the result is never that the community is entitled to the business appreciation. If the facts are right, the community may be entitled to a portion. I wouldn't go too far on "similarity" to other facts here as the area is fairly well litigated. (It's funny how divorce brings out the best of people.) When you start talking about things being similar, you better be aware that the specific thing has not already been decided.
The taxes on the gain is a sunk cost and no reimbursement is given.
This would mean that the community would pay taxes for a gain that the community never achieved? Make no sense either.
It's called a gift. Like the deed of the house, the return *signed by you* could be considered a writing that transmuted the assets. (That is, if there weren't specific cases on point for the treatment of the payment of taxes.) If you cared, you should have dealt with this issue at the time of payment, not now at divorce.
The gain on the stock option is separate property.
I agreed with everything you said before. But here it does not make sense. What if there are losses instead of gain??
I am assuming the option plan was a non-qualified plan where there was no readily ascertainable value for the options and, hence, cost nothing. If the stock value was less than the option, why would one exercise the option?
Who would pay for the losses? the community ?(or if you want her using "HER" earnings, which by now we pretty much agree that they are community funds). Where would she get the funds from if not from "her" earnings (community earnings) to pay for the losses?
*Now* pretty much agree? Is your desire for more bent your understanding so much to think anyone has not felt her earnings were community property from the start? To make the comment, it becomes clear you are not understanding or believing what is being told you. Why don't you give us the basis for your erroneous belief so your specific errors can be corrected?