Employers not paying workers their tips in their entirety, without deductions, may soon become illegal.
A bill sponsored by the Conservative MP for Ynys Môn, Virginia Crosbie, would also introduce an obligation to allocate tips fairly among workers.
The UK government is backing the move and said it would benefit more than two million workers.
The trade union Unite said it would reserve judgement until “potential loopholes” in the bill were closed.
Kristian Cuffin, 30, who owns the Cuffed In Coffee cafe in Holyhead, in Ms Crosbie’s constituency, said he could not imagine not already giving his staff the entirety of their tips.