Cash flow in a high tax area

I've found a triplex listed at $78k with a monthly income of $1300. I ran this through BP's rental calculator and 50% rule says it should cash flow about $320, however the tax percentage in my area is just shy of 12% meaning $4,590 annually in this example. Taxes  have destroyed cash flow on every property I've looked at and after accounting for vacancy, capex, etc. cash flow was calculated at $-242. This just seems wrong but I'm new to this, how are others coping in high tax areas?