The 7.65% you pay on money you never touch
When a client tips a stylist $40 on a card, the $40 belongs to the stylist. The salon's obligation does not end there: the IRS treats reported tips as wages for payroll tax, so the employer owes its 7.65% share of Social Security and Medicare on every reported tip dollar. On $140,000 of annual tips that is $10,710 out of the salon's operating account, on revenue it never recognized.
Restaurants complained about exactly this in the early 1990s and Congress answered with the Section 45B credit: report the tips, pay the match, claim the match back as a general business credit. Beauty businesses were excluded by the wording of the statute for 32 years.