Separate property generally includes assets a spouse owned before the marriage, plus property received individually during the marriage by gift or inheritance, and its appreciation is often (though not always) treated as separate as well. Marital property generally includes assets acquired by either spouse during the marriage through effort or income, regardless of whose name appears on the account or title. The classification determines whether an asset is even on the table for division — separate property is typically awarded to its owning spouse and excluded from the marital estate.

The classification is rarely as clean as the definitions suggest. A business started before marriage but grown substantially during it, a house purchased with separate funds but titled jointly, or an inheritance deposited into a joint account can each raise disputes about whether — and to what extent — separate property converted to marital property, or whether a marital component (such as the increase in value attributable to a spouse's labor) must be carved out and divided even while the separate component is preserved.

Because classification disputes often turn on tracing records and expert valuation rather than a single controlling fact, Juricratic represents the classification outcome as a probability-weighted dial rather than an asserted result, letting a user see how the projected marital estate — and therefore the projected division — moves as classification assumptions change.

Litigators build classification cases around documentary tracing: bank statements, deeds, gift letters, and appraisals showing an asset's origin and how it was treated during the marriage, because a successful separate-property claim can remove a significant asset from division entirely while a successful marital-property claim can bring one in. Valuation experts are frequently retained specifically to apportion appreciation between separate and marital components.