Please, help.. Unpaid invoice..

Hi Community Members,

I started my interior design business under my LLC, and this is my second year. Unfortunately, I have a client who hasn’t paid an invoice—it's not a huge amount, about $5,900. I’ve tried reaching out, but their business has shut down.

How should I handle this when filing my tax return? Also, I had a few projects lined up last year, but they were all postponed, making this my only source of income for the year.

Any advice would be greatly appreciated!

Thanks!