who is paying for the car? who is paying for the insurance? If it is all strictly your $ then you can talk to him about it but if it is all your $ then it isn't his problem. But no matter what you should talk to him AND the Father both.
Yes. My husband and I have a rule. If you spend over a certain dollar amount we discuss it. $11,000 is way over that limit! Even if it is all your money that you are using, is yours, it is just a good idea to talk it over with your spouse before making a purchase that size.
Yes, because your daughter will grow up and find her own life soon, but you will be living with your husband for the rest of your days and you don't want him to resent you. Also, money really belongs to both people in a marriage, legally even.
$11,000 for a first car??? I would get a cheaper one for a first car personally.... something to learn in. Yes... You should talk with the Step Father and let him know what the plans are. He probably doesnt mind but... He should be informed.
Your a team, in my opinion you should speak to him about it. Even if you are paying for it 100% it will still affect the financial situation in the house (if your like most Americans; not Trump haha). I think that maybe you guys should initially pay for it, but it doesn't sound like your daughter is too old so she probably does not have the money to pay for it. We all want to teach our children how to work hard without killing them. So my suggestion would be to tell her she needs to get a job before you buy her the car. Once she gets the job she will pay a percentage of her paycheck in order to pay you back for the car (responsibility). If payments are on time then she will only have to pay 1/2 of the car's worth if they are not, then she will have to pay "interest."