Does paying taxes and insurance for a separate property using post-marriage income render the separate property a community property?

Question

For community property states (e.g. California), if I have two properties, one is separate and one is community. Does paying taxes, insurance, or ADU/remodeling costs for my separate property using post-marriage income render the separate property a community property? Why or why not? Thanks.

Answer 1

In re Marriage of Branco is a relevant case where using community property for acquisition costs lead to community acquiring interest in the property.

Adding an ADU or remodeling is considered an improvement, i.e.: moneys spent on this are acquisition costs. So using community property to finance those may lead to community acquiring interest in the produced improvement.

In re Marriage of Wolfe is another relevant case, where while no claim of community interest was made, the community was reimbursed for moneys spent on the separate property. That can apply for all the expenses, including taxes, insurance, and improvements.