Corp standing of 6.67 will reduce reprocessing tax to 0 at NPC stations. It has no relevance to brokerage or sales tax. the linked chart shows the relationship between brokerage, broker relations skill, corp and faction standing before the most recent change. You’ll need to increase the base brokerage from 3% to 5% and the brokerage relations skill bonus from .1%/level to .3%/level. the standings effect is unchanged. I don’t know if anyone has an updated version of the chart.
