No.

The only thing that will affect your score is how the account is paid.

It can pull your credit down a little but not that much as long as they don’t do anything bad with that card, and it will help them out drastically.

*Your* credit score depends on *your*our credibility to pay off loans and bills. Joint accounts/loans cannot influence each other’s credit score. Activity of joint account helps (or damages) all the borrowers equally, regardless of past history or scores.

If you hold a joint credit account, have co-signed a loan or have authorized use of another person’s credit, these items could affect a score if they appear on your credit report. It’s important that joint account holders or authorized users understand that their credit behavior does affect the other joint account holder or main account holder.

A credit account held solely in the name of your spouse, child or any other family member cannot impact your credit score. However, in community property states, all debt acquired during a marriage is considered a joint debt, regardless if the account is joint or in the name of an individual spouse.

Tip: Paying bills on time is generally the single most important contributor to a good credit score