Definition
A term from Scots law describing a category of obligation of unusual severity, by which the debtor is bound to perform a specific act rather than pay a sum of money. The defining characteristic is not merely the nature of the performance owed but the harshness of the legal consequences attached to non-performance: a debtor under an obligation ad factum praestandum is denied several protections ordinarily available to debtors in distress, including the benefit of the act of grace, the privilege of sanctuary, and the cessio bonorum (the formal surrender of assets to creditors in lieu of imprisonment). The obligation is, in essence, one that cannot be discharged by substituting money or by invoking debtor-relief mechanisms that would otherwise interrupt enforcement.
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Common Confusion
The phrase is a hybrid of Latin (ad factum praestandum, "to the performance of an act") and the Scots legal tradition that preserved and applied it. It should not be confused with ordinary specific performance obligations in English or American equity. While both concepts involve compelling a party to do something rather than pay damages, ad factum praestandum is a Scots private law category with specific procedural consequences that have no precise equivalent in common law systems. Researchers accustomed to English or American sources will not find the term operative in those traditions.
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Why It Matters in Research
This term is a navigational dead end if approached through English or American legal dictionaries—it belongs almost entirely to the Scots private law tradition and appears in historical sources almost exclusively in discussions of Scots obligations and diligence (enforcement) law. Researchers working in the Law Mind corpus should treat any appearance of the term as a signal that the surrounding text draws on Scots institutional writers, most likely Erskine, Stair, or Bell.
The key research trap is spelling: the term appears in historical sources variously as ad factum praestandum and ad factum przestandum, reflecting inconsistent Latinization and typographical variation across older printed texts. Searching only one form will produce incomplete results.
The denial of cessio bonorum is the most legally significant detail. The cessio bonorum was a mechanism by which an insolvent debtor could surrender all assets to creditors and thereby escape imprisonment for debt. Being excluded from it under an obligation ad factum praestandum meant that the creditor could pursue personal diligence—enforcement against the person—even after the debtor had nothing left to surrender. This made the obligation functionally punitive in a way that ordinary money debts were not.
Corpus connections: discussions of this term frequently appear alongside entries on diligence, imprisonment for debt, cessio bonorum, and the Scots law of obligations. If a historical source discusses the act of grace or sanctuary in a debt context, an obligation ad factum praestandum may be in the near vicinity.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) is the primary English-language legal dictionary source for this term, and its entry is brief but accurate, citing Erskine's Institutes (Book 3, Title 3, Section 62) as authority. Erskine is the correct institutional source; his treatment of this class of obligation reflects the accepted Scots doctrine of his era.
Black's does not elaborate on the practical mechanics of how the obligation arose—typically by express contract in Scots practice—or on how courts distinguished obligations of this type from ordinary personal obligations. The entry also does not address the gradual softening of Scots diligence law that eventually narrowed the practical difference between ordinary and ad factum praestandum obligations, particularly as imprisonment for debt was curtailed by statute in the nineteenth century.
No other source dictionary in the current Law Mind shelf addresses this term. Researchers requiring deeper treatment should consult Erskine's Institutes directly, or Bell's Principles of the Law of Scotland, both of which are more expansive on the Scots law of obligations and enforcement.
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Jurisdictional Note
This term is operative only in Scots law. It has no direct counterpart in English common law or American law, and its practical force diminished significantly as statutory reforms in Scotland curtailed personal diligence and imprisonment for debt. It remains a term of historical Scots private law rather than active modern doctrine.
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