The credit card company will not have a lien on your home until they obtain a judgment against you, so they wouldn't hurt your ability to sell. A pending lawsuit would not affect the sale of your home, but would mean they are close to it, because they are close to securing a judgment.
Best of luck,
Tim L Eblen
Avvo indicates that you live in Seattle, so I will answer accordingly. If a creditor sues you in King County Superior Court and gets a judgment against you, that judgment automatically becomes a lien on your home. It is possible in some circumstances for a creditor to get a "pre-judgment attachment", but I would be surprised if any of your creditors tried this. However, you should check your credit report to make sure you don't have any judgments currently. It is not unheard of for creditor's attorneys to get a default judgment without properly serving the lawsuit on you. If this is the case, you can ususally have the judgment vacated.
This answer is in the nature of a general legal analysis and is not taylored to the facts of your specific situation. It should not be construed as legal advice, and you should meet with an attonrey before taking action on this matter.
Until you get sued, you are free to act as you please, subject only to the provisions of the Uniform Fraudulent Transfers Act. You can find this law on your state's website or by doing a simple web search. Should a creditor sue you while a sale is pending, you will want to defend yourself, which might or might not require you to obtain legal representation. Hope this perspective helps!
I agree with Mr. Eblen. A judgment lien won't stop the sale of your house. It will decrease the net amount you receive from the sale, however.
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As long as the home sale has closed before a judgment is entered, you should not have a problem. The lien can attach only upon judgment unless the creditor takes very unusual action to prevent you from selling.