Summary
Where community funds paid down principal on a home one spouse bought before marriage, the community acquires a pro rata interest in the property based on the principal it paid, including a share of appreciation during marriage. Interest, taxes, and insurance payments do not count toward that share.
What it means for the financial analysis
The Moore formula is arithmetic, but it depends on clean principal-only payment history and accurate values at marriage and at trial. Loan histories and refinances are where these calculations usually go wrong.
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