As of 1 January 2016, wages up to RD$36,326.92 a month will not be subject to income tax. The DGII establishes an annual adjustment for inflation of the exempt income level.
There are taxation increases on rising income on a scale of 15%, 20% and 25%.
http://www.listindiario.com/economia/2015/11/16/396369/reinicia-en-enero-exencion-del-isr-a-los-trabajadores
http://www.dgii.gov.do/informacionTributaria/publicaciones/guiasContribuyente/Documents/8.pdf