Oh boy, the unlawfulness of USA. This would be clearly illegal in EU, as misleading pricing.
Even if stated there's an 18% extra fee, I'm pretty sure it would be illegal to state prices exclusively without it.
I would simply refuse to pay that fee if it was here, and report them to authorities.
Scummy businesses sure exist but you would never see this in Amsterdam or Paris. I'm pretty sure there are laws that whatever price is shown is the final price.
You're probably right. But judging from other comments in sounded like a small note on the front cover of a menu saying 'there will be a flat rate surcharge' would not be adequate.
Obviously, this is a horrible way for me to collect legal advice, but would a fine-print note on a menu fly? (interpret 'fly' however, I'm clearly naïve here.)