First of all, I live in the state of NY. We have had contractors do work that would constitute as capital improvement (windows, boiler, plumbing not related to a repair). One of them charged me sales tax. I looked on the government's website and it stated that if you fill out the form you are not required to pay sales tax. He disagreed with and stated he doesn't have a tax id so he has to pay sales tax for the product he buys. He also said I would be able to include this in my taxes at the end of the year along with my other deductions. Is this all true? Should he have charged me sales tax. Here is the website I got this from:

http://www.tax.state.ny.us/pdf/1997/st/st124_797_fill_in.pdf

Unfortunately, you need a lawyer or accountant to decipher this stuff. Thanks for your help.

It's irrelevant whether he should have charged you sales tax. He did it and it's water under the bridge.

You can deduct it on your return if the work was done on a business or a rental property. If it was done on your home, then there are no tax consequences, good or bad.

Am I required to pay Rhode Island Sales Taxes for Capital Improvements to the cantractor or the supplier when Ipurchase new windows?

Am I required to pay Rhode Island sales taxes for capital improvements to my home to the contractor or to the supplier when I purchase new windows?

Is the installation of dishwashers, sinks kitchen cabinets and the labor required sales taxable in Florida?

The dishwasher - almost definitely.

Kitchen cabinets, maybe not; depends on the specific sales tax law in Florida.

Labor, probably not.