Start with a supportable current value and a complete list of mortgages, home-equity obligations, tax liens, or other claims. Identify when the property was acquired, how the purchase and later improvements were funded, and whether either spouse asserts a separate-property or reimbursement issue.
A tax appraisal, online estimate, refinancing appraisal, and market appraisal can serve different purposes. The appropriate valuation evidence depends on the decision being made and whether the spouses agree.