Late fee calculator
Flat or percentage, with the grace-period logic spelled out.
Late fee due
$75.00
Paid day 9, grace ends day 5
Total due with rent
$1,575.00
Many states cap late fees or require them to be "reasonable" — and a fee is only collectible if your lease authorizes it. Check both.
The three parts of an enforceable late fee
A late fee that survives a dispute has three parts, all written in the lease: the trigger (rent unpaid after day N), the amount (flat dollars or a percentage), and the authority (the lease clause itself). Miss any one and you're negotiating instead of collecting.
The grace period is where most confusion lives. "Rent due on the 1st, late after the 5th" means the fee applies on the 6th — the grace day itself is still a clean payment day. Set it, write it, and apply it the same way every month for every tenant; selective enforcement is how fees die in court.
Then there's the bookkeeping: the fee is its own charge, not a bump to rent. It needs its own line so partial payments allocate correctly and the running balance stays truthful — that's the difference between a defensible ledger and an argument.
Frequently asked questions
What's a reasonable late fee?
Common practice is 5% of monthly rent or a flat $50–$100, after a 3–5 day grace period. Several states cap fees by statute or require 'reasonableness' — check yours before setting anything.
Is a late fee enforceable if it's not in the lease?
Generally no. The lease has to authorize the fee, its amount, and when it applies. If your current lease is silent, add it at renewal — not mid-term by surprise.
Does a partial payment stop a late fee?
Usually not — if the grace day passes with any rent unpaid, the fee typically applies (subject to your lease and state law). This is exactly where spreadsheet bookkeeping breaks: charge, partial payment, fee, payment need to stay in order.
Should I waive fees for good tenants?
A one-time written waiver preserves goodwill AND the enforceability of future fees. Silent non-enforcement, repeated, can undermine the fee entirely. Waive deliberately, in writing, or not at all.
Late fees that apply themselves
Set the rule once — LetsGoLandlord applies fees on schedule, on their own ledger line. Free for 14 days.