Section 8 paying their share this year. Letter writing advise

[Brad Sparks]

For the first time since I've had this house (four years), the tenant has to pay what's above the voucher ($23/month). I plan to send a letter giving them options on how to pay. In the lease signed in 2019, we left the section on rent blank because she wasn't paying anything. Do I draft a new lease with the information filled in or will a letter due?