They quoted me $1650 plus tax, they invoiced me $1650.00 plus tax.
But when onsite and I asked for the total to fill out a check, he told me $1977. I did not question it and gave him the check for $1977. Later my bookkeeper said that is $1750 plus tax.
So they overcharged me. I emailed and called them, but he said I am wrong, the invoice just had an error and the quote he gave was $1750.
Lesson - get your quote in writing and add the tax for the total yourself.