Here's a past topic that covers this a bit. I have only used a guide maybe 2 times, and all within the past year. If the service is really good, I have done 20%, but since guiding rates can vary greatly, That may not always be the best way to go.
I usually have the same people every year, and I don't expect a tip from them. They always leave extra, I guess about 10%. But I own the business so it's not expected. They do tip my deck hand usually about $25 a day.
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