
Quoting
jk
There is no legal obligation the equity be split anything other than 50/50. They are considered equal owners and that means they each own a 1/2 interest and are due 1/2 of the equity.
For the division of the property, no, none of that matters. Within the divorce the issues stated may allow a different division of all matters within the marital assets but as an independent item, no.
She could sue for his 1/2 share of the taxes she has paid over the years but as mr k suggests, he can argue her exclusive use of the home was compensation for that. As to other costs such as utilities; she used them, correct? Why should he pay for her utilities?