Any process that decreases the rate, frequency or extent of inositol phosphate biosynthesis. Inositol phosphate biosynthetic processes are the chemical reactions and pathways resulting in the formation of an inositol phosphate, 1,2,3,4,5,6-cyclohexanehexol, with one or more phosphate groups attached. (Gene Ontology, GO_0010920)
1 genes participating in the negative regulation of inositol phosphate biosynthetic process biological process from the curated GO Biological Process Annotations 2023 dataset.
