(1) A right to the payment of a monetary sum may be assigned partially. 


(2) A right to other performance may be assigned partially only if it is divisible, and the assignment does not render the obligation significantly more burdensome.




1. Economic interest


The partial assignment of a right may serve different economic purposes. A contractor may for instance want to assign part of its right to payment from a customer to a financing institution and keep the rest for itself. Or it may want to assign the other part to a supplier of raw materials. 


Permitting partial assignment may however affect the principle that the assignment should not worsen the obligor’s situation. If the right is split, the obligor will have to perform in several parts, which could entail extra costs.


2. Monetary and non-monetary rights


The obligor’s burden of having to make two or several monetary payments instead of one is not in itself deemed to be excessive, and partial assignments of monetary rights are therefore permitted in principle (paragraph (1)). 


Another rule prevails for the assignment of non-monetary rights, where the validity of the partial assignment is made dependent on two cumulative conditions: the divisibility of the performance due and the degree of additional burden the partial assignment may place on the obligor. Article 9.1.3 already excludes the possibility to assign non-monetary rights in their entirety if the assignment would render the obligation significantly more burdensome. Paragraph (2) applies the same rule to the partial assignment of such rights. 


In any event, additional costs borne by the obligor as a result of having to perform in several parts must be compensated under Article 9.1.8.




1. Buyer X is due to pay a price of USD 1,000,000 to seller A on 31 October. A urgently needs USD 600,000 and assigns a corresponding part of its right to bank B. Notice of the partial assignment is given to X. On 31 October, both A and B claim payment of their respective parts. X must pay A USD 400,000 and B USD 600,000.


2. Metal company X is to deliver 1,000 tons of steel to carmaker A on 31 October. Due to a decrease in sales, A estimates that it will not need that much steel at that time, and assigns the right to delivery of up to 300 tons to carmaker B. Notice of the partial assignment is given to X. On 31 October both A and B claim delivery of their respective quantities. X must deliver 700 tons to A and 300 tons to B.


3. Tax consultant X has promised to spend 30 days in examining the accounts of company A in order to determine the proper policy to be followed in the light of new tax regulations. A subsequently regrets this arrangement, in consideration of the level of the fees to be paid. It proposes to assign 15 of the days to company B. X can argue against such a partial assignment on the grounds that performance of tasks of that nature is not divisible. It can also argue that the accounts of B are of a significantly more complex nature than those of A.

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