What to Do When an Invoice Is Overdue

An overdue invoice is an invoice whose agreed termin płatności has passed while an amount remains outstanding. Before treating it as overdue, check the actual terms, any partial payments and whether the Klient received the correct document.

Practical steps to take

1. Check the invoice details. Confirm the numer faktury, Klient, amount, currency, termin płatności and payment instructions.
2. Re-read the agreed warunki płatności. Confirm what starts the payment period and whether the stated termin płatności is correct.
3. Review your payment records. Check bank, card or payment-platform records and match any partial payment to the invoice.
4. Confirm the invoice was received. Verify the billing contact and ask whether the Klient needs another copy or clarification.
5. Send a courteous reminder. Refer to the numer faktury, original termin płatności, balance and a clear next action.
6. Discuss a payment issue. If the Klient raises a dispute or cash-flow concern, document the conversation and any agreed arrangement.
7. Consider late fees only after review. Use them only where supported by the agreement and applicable requirements. This guide does not determine whether a fee is permitted.
8. Keep a record. Save the invoice, reminders, replies, receipts and any updated payment plan with the same reference.

Friendly reminder example

Late-fee arithmetic is not legal advice

A calculator can kosztorys a fee from principal, dates, rate, grace period and caps you enter. It cannot verify the contract, local law or whether a fee is appropriate in your case. See the late-fee calculator for arithmetic only.

If the invoice date or terms need checking, review the due-date guide and warunki płatności.

Problems this guide helps you solve

• Choosing the right document for the current stage of the deal (proposal, bill or payment record).
• Avoiding vague descriptions, missing dates or unclear payment instructions that delay settlement.
• Keeping numbers, statuses and follow-ups aligned with what actually happened—not assumptions.

Decision checklist

1. Confirm the agreement stage: proposal, accepted work, billing or payment received.
2. Verify parties, currency, references (PO/project) and unique document numbers.
3. Make the amount due and the next Klient action obvious.
4. Save a copy and record how the document was delivered or how payment was matched.

Common mistakes

• Sending a proposal labelled as an invoice before billing is appropriate.
• Reusing document numbers or leaving critical dates blank.
• Marking something paid before funds are confirmed in your records.
• Omitting payment instructions or using a termin płatności that conflicts with written terms.

Next steps

Draft or adjust the document in the free generator faktur, then review related guides linked on this page. Requirements can vary by jurisdiction—confirm what applies to your situation.