Tips are still income. If we increase the minimum wage so that people can afford to live then I can't see any reason why we wouldn't tax tips also.
If you're making $2.50/hr plus tips then I think you deserve a break and not taxing tips is a sensible break. A better solution would be to prevent restaurants from paying their people poverty wages, and if servers aren't risking starvation and homelessness if they go without tips for a week then why would you not include their tips in their regular income?
Raise the minimum wage, require servers to be paid minimum wage, and enforce a straightforward tax on people's income that doesn't distinguish wage from tips. Maybe also increase the 0% tax bracket to something more reasonable, like $20-40k, just to simplify things for people who are struggling to subsist while we're at it.
> require servers to be paid minimum wage
There is no jurisdiction in the US that allows servers to be paid less than the standard minimum wage. Even where you find server minimum wages (your $2.50/hr example, although not all states allow this) the employer is required to top up to the standard minimum wage if tips don't cover the difference.
Which makes this kind of silly,
> If you're making $2.50/hr plus tips then I think you deserve a break and not taxing tips is a sensible break.
If $2.50/hr + tips exceeds minimum wage, why do you need a special break? You're making more than other minimum wage workers. If $2.50/hr + tips does not add up to minimum wage, the employer has to get you to minimum wage, so you are making no less than someone else making minimum wage.
If people with low income need a break, just give people with low income a break. How that low income is derived is irrelevant.