Hi vsilinin, 

Thanks for joining us here.  When you write off an invoice as 'Bad Debt', the transaction is closed out.  However, if you're still not certain, I recommend reaching out to your accountant for their expertise.  If you don't have an accountant, we can help you locate a ProAdvisor in your local area.

Feel free to reach out again if you have other questions or concerns.  We'd be glad to help!