In my experience:
-Guaranteed pay is normal. That means that if the nanny is available to work and you do not need her (because you're going out of town, you let her go home early, etc) that she still gets paid for the full day.
-paid vacation time. Nannies usually get two weeks: one is the employer's choice, one is the nanny's choice.
-paid sick days. 3-5 sick days paid for a full time nanny.
-time and a half past 40 hours. Legally required.
You are not obligated to buy her a car or pay for insurance. You are required to reimburse at the mileage rate.
http://www.forbes.com/sites/kellyphillipserb/2012/...s-2013-standard-mileage-rates/ 56.5 cents per mile. It's nice to 'round up' if you're willing. Kids put wear and tear on a nanny's car. It's also GREAT if you buy an extra car seat -- that way you won't have to constantly take the car seat in and out of the nanny's car.
Health care is a perk, but not required by any means. Plenty of people don't offer it.
Perks that may seem small, but are really appreciated: keeping some snacks on hand for the nanny; a drink she likes, fresh fruit and vegetables, etc. Letting her use the internet during her down time at work.