[conductr]

Agree. It is the norm. All restaurants, the most common places to tip, do this too. If they calculate/print suggested tip amounts they use post tax and also if you trigger a gratuity included they use post tax.

To be far, I think most people use post tax when calculating tip in their head too.

[ihaveajob]

One thing I hear a lot is to just double the sales tax. Around CA, when it was around 7.5%, it added up to a nice 15%. Since they recently increased sales taxes to about 8.5-9% depending on the city, it doesn't work that way. Or yes, if you account for tip inflation.

[monksy]

One thing I saw recently is that a place did 18, 20, 22%. I'm pretty sure I tipped lower just for that.

[smackfu]

> If they calculate/print suggested tip amounts they use post tax

I see it done both ways.