@SOGGIE wrote:If you want to introduce your child to the world of credit while being mindful of its dangers, read:
https://www.marketwatch.com/story/read-this-before-giving-your-teenager-a-credit-card-2018-06-13
I recently added my 18 yr old DD and 23 yr old DS as AU on one of my cards. I laid down the following expectations, and knowing that thier access to the card will be terminated if they don't follow the rules. Before I let them have a card they were both paying their portion of the cell phone bill each month for over a year. Never once did they miss the phone payment or ask for help with it. Them also having a card , specificlly DD who still lives with me allows me to have her pick something up at the store put it on the card and I pay for it. That way I do not have to give her cash before hand or transfer money to her bank account.
1. The card will only be used for something you would be purchasing normally. Such as your phone bill, gas or the car, etc.
2. Purchases will be paid for in full not later than then payment due date for the statement on which they appear. This way no interest is ever paid.
3. A maximum of $100 my be charged by each child. If you get to $100 then you need to make a payment before you can use the card again.
4. They are to text message me that have used card. I get a notification from the cc app anyway, but I want them to know I am watching.
5. Any exceptions to the above must be approved by me in advance of the charge. i.e. DS lives on his own, so if he needed to pay a Dr bill and carry that balance for a month or two, I might approve that as long as he paid any interest charged.
We have been doing this for three months and so far so good.
Heh I opened my first student card shortly after turning 21 because I was sick of my parents questioning why I was spending so much on computer games. 
