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Should I be worried that I won't be given a receipt if I pay with cash?
In some states, it is your responsibility to pay the sales tax on a transaction, even if the party your purchase from doesn't collect it. This is common with online purchases across state lines; for example, here in Massachusetts, if I buy something from New Hampshire (where there is no sales tax), I am required to pay MA sales tax on the purchase when I file my income taxes. Buying a service that did not include taxes just shifts the burden of paperwork from the other party to me. Even if you would end up saving money by paying in cash, as other here have pointed out, you are sacrificing a degree of protection if something goes wrong with the transaction. He could take your money and walk away without doing the work, or do a sloppy job, or even damage your vehicle. Without a receipt, it is your word against his that the transaction ever even took place. Should you be worried that he is offering a discount for an under the table transaction? Probably not, as long as you don't take him up on it.