Babysitter: One evening's pay and a small gift from your child
Live-in nanny: One week's pay and a gift from child
Building superintendent: $20-$80
Yard/garden workers: $20-$50 each
Housecleaner: 1 week's pay
Dog walker: 1 week's pay
Mail carrier: Non-cash gift up to $20 (Postal Service policy)
Hairdresser: Cost of one session
Personal trainer: Cost of one session
Newspaper delivery person: $10-$30 or a small gift
Peggy Post's additional tips on tipping:
If the service is bad…
You tip based on quality of service – more if it's exceptional, less if it's terrible – but giving nothing is extreme. Especially at a restaurant, consider if it was really the server's fault.
If you don't have the right amount on you…
It's OK to ask the person for change to break a big bill. If you're not carrying enough cash, give what you have and assure them you'll tip them more later. If there will be no later, just thank profusely.
If you can't afford much…
Tip what you can, or give a non-monetary gift, such as a nice card or homemade cookies.
Read up on tipping customs outside the U.S. Conde Nast Traveler published an excellent tipping guide at concierge.com/cntraveler/articles/500117