Bioinputs are natural products applied to crops that contribute to a more sustainable agriculture by boosting yields and reducing environmental impacts. This study explores the effect of complementary inoculation with growth-promoting bacteria on soybean development and yield. Five treatments with growth-promoting bacteria were evaluated: T1 - Control (no inoculation), T2 - Azospirillum brasilense strains CNPSo 2083 and CNPSo 2084, T3 - Pseudomonas fluorescens strain CNPSo 2719; Azospirillum brasilense strains CNPSo 2083 and CNPSo 2084, T4 - Priestia aryabhattai strain CBMAI 1120; Bacillus haynesii strain CCT 7926; Bacillus circulans strain CCT 0026 and T5 - Priestia megaterium strain BRM 119; Bacillus subtilis strain BRM 2084. In comparison with the control, all treatments with growth-promoting bacteria of the genera Azospirillum, Pseudomonas, Priestia and Bacillus, applied after soybean emergence, induced higher grain yield. Co-inoculation with Priestia megaterium and Bacillus subtilis (treatment T5) resulted in a higher 1000-grain weight, while Priestia aryabhattai, Bacillus haynesii and Bacillus circulans (treatment T4) increased the number of pods and shoot dry weight.