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Late Fee and Interest Calculation Helper

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Compute charges correctly and fairly.

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Help me calculate late payment charges. Invoice amount and due date: [INVOICE_AND_DUE_DATE]. Payment date or today's date: [PAYMENT_DATE]. The terms in my contract: [CONTRACT_TERMS]. Jurisdiction: [JURISDICTION].

Compute days late, a fixed late fee if the contract has one, and interest under the stated rate using simple interest: interest = principal x annual rate x days late / 365, showing each step. Provide the total due and a breakdown. Present options if I choose to waive part of the fee, with the effect on the amount.

Add a message to the customer (100 words) explaining the charge neutrally and referencing the contract clause, and a checklist before charging: terms were agreed in writing and communicated, rates do not exceed legal limits [VERIFY in [JURISDICTION]], the invoice was delivered, the customer has no open dispute. Remind me that statutory late-payment rights and limits vary by place and that I should confirm with an accountant or lawyer. Do not invent rates.

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Invoice 2,400 due 1 May; paid 19 June. Terms: fixed late fee 40; interest 8 percent a year simple.
Days late = 19 June minus 1 May = 49.
Interest = 2,400 x 0.08 x 49 / 365 = 25.77.
Total charges = 40 + 25.77 = 65.77; total due = 2,400 + 65.77 = 2,465.77.
If I waive the fixed fee: total due = 2,425.77, a reduction of 40.
Customer message (about 80 words): "Hi Dana, payment for invoice 2231 arrived on 19 June, 49 days after the 1 May due date. Under clause 6 of our agreement, a 40 late fee and 25.77 interest apply, a total of 65.77. If you would like to discuss this, I am happy to talk."
Check before charging: written terms agreed, rate within local limits [VERIFY].

• late-fees
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