"Bob" wrote in message
...
Years ago, I asked the PA Dept. of Revenue about sales tax. They told me I
was not required to collect sales tax on anything I install, as long as I
pay sales tax on an item when I buy it.

I hope NYS agrees with you, because I have done that rather than mess with
tax exempt certificates when buying supplies. My theory is that the
customer is buying the supplies and reimbursing me for them; I am only
selling my labor and profit.