When Alexander Koury took his cats to get groomed a few weeks ago, he got a bit of a shock at the checkout counter.

The Phoenix financial planner brought his 5-year-old orange tabbies Frankie and Scotch in for bathing, clipping and shaving, which cost $150. But then the payment system asked whether he wanted to tack on a healthy tip: Either 20, 25 or 30 percent.

"Ridiculous," says Koury, 36, who says it was not explained to him why he needed to tip, or whom. He was so irked, in fact, that he ended up giving no tip at all.

Traditionally, many consumers have rewarded tip-worthy service when the spirit moves them, and within a certain range: 10 percent is on the low side, 15 is fairly standard, and 20 is seen as generous.

But with the advent of pre-calculated tipping options, and apps like Square that allow businesses to customize payment screens, consumers are prompted for tips in unfamiliar circumstances. Options in the 20-25-30 percent range pop up with increasing frequency.

Welcome to the phenomenon of "tip inflation."

Recent data from Square, a popular mobile payments app led by Twitter co-founder Jack Dorsey, reveals that tip encouragement seems to be working: The average tip for taxis last year was 16.54 percent, in the food and beverage sector it was 17.05 percent, and in salons it was 18.55 percent. In a previous analysis, Square users reported that from 2013 to 2014, customers tipped 35 percent more frequently.

It should be noted that Square's default settings for amounts over $10 are "No tip, 15 percent, 20 percent, 25 percent." So if you are seeing tip options of 20, 25 and 30 percent, that has been customized by the business owner.

"Don't fall for it!" says New York financial planner David Mendels. "Twenty percent is a generous tip, and if I don't give more than that, it doesn't make me a miser. If they suggest more, it makes them greedy and unprofessional. That is reason enough to knock it down to 15 percent."

The bottom line: Business owners have every right to ask for whatever tip they deem appropriate. And you, in turn, have every right to say "No."

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