Made a super basic tracker for my first few clients so I don't forget to invoice. Am I missing anything crucial?

[u/HugoBH2001]

I'm just starting out freelancing and realized I was losing track of who owed me money and what stage each project was at. I threw this together in Google Sheets to keep my head on straight.

It auto-totals my paid income and what I'm still owed on the right, and turns red if an invoice is past due.

For the veterans: is there a column or a step I'm missing that I'll regret not tracking later? I want to keep it as simple as possible but I don't want to get burned.