________________________________________ *Corresponding author: Email: zaharuna@nda.edu.ng; Journal of Advances in Mathematics and Computer Science 37(7): 1-15, 2022; Article no.JAMCS.83664 ISSN: 2456-9968 (Past name: British Journal of Mathematics & Computer Science, Past ISSN: 2231-0851) _______________________________________________________________________________________________________________________________________ Capacity Constrained Warehouse Inventory Model for Deteriorating Items under Two - Level Partial Trade Credit Z. H. Aliyu a* and B. Sani b a Department of Mathematical Sciences, Nigeria Defence Academy, Kaduna, Nigeria. b Department of Mathematics, Ahmadu Bello University, Zaria, Kaduna, Nigeria. Authors’ contributions This work was carried out in collaboration between both authors. The first author ZHA in collaboration with the second author BS carried out the research. Both authors read and approved the final manuscript. Article Information DOI: 10.9734/JAMCS/2022/v37i730462 Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/83664 Received 23 January 2022 Accepted 28 March 2022 Published 05 August 2022 __________________________________________________________________________________ Abstract In trade credit financing, failure in payment leads to great loss or total collapse of business. Thus, good policies are invented to address situations when retailers or customers are suspected to be credit – risk in order to reduce the effect of the failure in payments on the business. In most cases, the focus has been on either credit - risk retailer or credit – risk customers but not both. This has not taken care of some market happenings when both retailers and customers are simultaneously perceived as credit – risk. This provides additional dimension to the supplier and retailer to curtail the menace of failure in payment at upstream and downstream levels respectively. In this study, partial trade credit is proposed concurrently at both upstream and downstream levels to curtail the menace of failure in payment. Numerical illustration of the model developed for the situation is given. The model determines the optimal cost in each of the possible cases and sensitivity analysis carried out to see the effect of parameter changes on the optimal solution. Keywords: Partial trade credit; deterioration; credit worthy; credit – risk. 1 Introduction Competition in the market necessitates invention of strategies or procedures such as promotional tools to enhance sales so as to increase earning. One of such promotional tools, among others is trade credit financing. Original Research Article