The difference between an unliquidated debt and a liquidated debt is this: Liquidated Debt: A debt that has an exact monetary value. Unliquidated Debt: A debt that is undisputed as to its amount, but still under the liability of the debtor. Each one of these debts has a statute of limitations to it. I believe they stand at 3 years for liquidated debt, and 6 years for unliquidated debt. These numbers are for Colorado and can change from state to state based on their rulings.