Late rent — what to do in the first 72 hours

Most late rent is not the start of an eviction. It is a paycheck timing problem, a bank hold, or a tenant who is embarrassed and hoping you will not notice. How you handle the first three days decides which of those it stays.
Day one: a neutral reminder
Send a short, factual message the day after rent is due. No warnings, no threats — the amount, the date it was due, and how to pay. Send it the same way every month so it reads as a system rather than a personal reaction.
Day two: make a plan, in writing
If the tenant responds, get a specific date and amount. Confirm it in writing so both of you are working from the same record. A partial payment can carry consequences for what you are able to do next, so decide deliberately before accepting one.
Day three: apply the lease
If there is no contact, apply the lease terms exactly as written — grace period, then any late fee the lease authorizes. Consistency is what makes a late fee defensible later.
Keep the record clean
Every reminder, every promise, every payment: logged with a date. Nine times out of ten you will never need it. The tenth time, it is the only thing that matters.