Does cosigning for an apartment affect your credit?

I am trying to get my parents to help cosign for my first apartment because I make just under the 3x income requirement. They are hesitant because they think it will hurt their credit and they are trying to buy a new car soon. My second question is: will the leasing agent share with them how much my income actually is? I make more than enough to cover my monthly rent and all expenses with about 600 left over for savings, but I kinda had to stretch what I told them I made otherwise I wouldn't have been able to move out on my own. They think I am making 50k, but I am actually starting out at 40k. Will the leasing office just have them sign a co sign form, or will they actually share a form that shows my income on it?

Does cosigning for an apartment affect your credit?
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