I have not been giving out rental receipts. What should I do now?

[Oscar Cortez]

Hi all. I started midterm renting rooms in January on Furnished Finder. Up until recently did I discover that I needed to be giving out rental receipts as a business would. I currently have 2 tenants that are coming into their 2nd month of rent with me. I will be giving them receipts I found from law depot and moving forward. 

However, is it too late to give them a receipt for first months rent?

what about security deposit?

Should I reach out to the 2 previous tenants and offer them their receipts for the months they were here?

Thank you all for your help