Fee for late rent

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How soon do you guys start charging a late fee for late rent? I used a standard lease form that my agent provided and it says rent due on the 1st of each month. Then 3% late fee if more than 10 days late. Is that standard? My tenant has never paid on the first other than when he provided a couple of future dated cheques and I deposited on the first. He always pays, but it takes tons of reminders and it's closer to the 10th than the 1st. Just wondering how you guys handle.