Based on the DSIRE.org website it seems that Commercial PV Systems are eligible for a NY State sales tax.

What is the tax rate for these systems?

Do most contractors charge for this tax or are there legal ways to avoid the taxation?

Will a Capital Improvement form suffice to avoid this taxation?

Steve

Sales tax on commercial systems is 8.625%

Capital improvement Certificates only waive the sales tax on the labor. Sales tax on materials is supposed to be contained within your price. Sounds like you should have a good discussion with your accountant how your office should handle this as everyone seems to have a different taste for risk to both themselves and the customer