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Most invoices don't need a follow-up at all — they just get paid. But knowing when and how to check in on the ones that don't turns an awkward guessing game into a routine, low-stress part of running a business.
Before the due date: a confirmation, not a chase
A short note a few days before the due date — "just confirming this arrived and everything looks right" — isn't a reminder about a late payment, because nothing is late yet. It exists to catch a genuinely lost email, a wrong recipient, or an unanswered question while there's still time to fix it before the due date passes.
On the due date: a plain, factual note
If payment hasn't arrived by the due date, a brief, neutral message works better than an apologetic one or an accusatory one: state the invoice number, the amount, and the date it was due. At this stage, assume there's a simple explanation — an email in the wrong folder, an invoice waiting in someone's approval queue — rather than assuming anything adversarial.
A week past due: get specific
If a few days pass with no response, ask a direct question rather than repeating the same note: has the invoice been received, is anything blocking payment, is there a new expected date? This is also the point to check that you're actually reaching the right person — accounts payable rather than your usual point of contact, if the two are different.
Two to three weeks past due: escalate the tone, not the threats
At this stage it's reasonable to be more direct about next steps — mentioning your stated late fee if you have one, or setting a firm date by which you need a response. See our guide on invoice reminder templates for language that stays professional while being unambiguous about what happens next.
Beyond a month: treat it as a collections situation
Past this point, routine follow-up has likely run its course. See our guides on collection letter templates and collecting unpaid invoices for the next steps.
Keep a simple log
For each overdue invoice, a short record — date followed up, method, response (if any) — means you're never guessing whether you've already checked in, and gives you a clear record if the situation eventually needs to go further.
The goal of following up isn't to escalate quickly — it's to escalate at the right pace, giving a genuinely delayed payment room to resolve itself while still moving deliberately toward the next step if it doesn't.