ACH Authorization Reminder Letter

When to use this template

Reach for a ACH Authorization Reminder Letter when the message benefits from being preserved in writing rather than left to memory or a phone call. The structure below is designed for the typical case — read it through once, replace the bracketed fields with your own details, and trim anything that doesn't apply to your specific situation. For more on the conventions specific to invoice & billing letters — when a written record matters, what tone to strike, and what the recipient is reading for — see our Invoice & Billing Letters writing guide. The plain-language conventions used throughout this letter follow the same writing principles many professional editorial style guides recommend: short sentences, concrete nouns, and a single clear request per paragraph.

The letter

Dear [Recipient's Name],

This is a friendly reminder that invoice [Invoice Number] for [Amount], originally due on [Due Date], is now [number of days] past due. As of today, no payment has been recorded against this invoice.

For your reference, here are the invoice details:
  • Invoice number: [Invoice Number]
  • Original date: [Date]
  • Amount due: [Amount]
  • Payment methods accepted: [ACH, credit card, check]

If the invoice has already been paid in the last few days, please disregard this notice. If you have any questions about the charges or need a copy of the original invoice, I'd be happy to send one — just reply to this letter or call me at [Phone].

We appreciate your prompt attention to this and value our continued working relationship.

Sincerely,

[Your Name]
[Your Title]
[Your Company]

Download & format options

This template is delivered as plain editable text — copy it into your preferred document tool, or use the format-specific instructions below. Every download includes the same letter body and the field placeholders shown in brackets.

Read the writing guides →

What's specific about ACH Authorization Reminder Letter

What makes this ACH Authorization Reminder Letter different from the other invoice & billing letters in this category is the specific situation it was written for. The structure, tone, and pacing of the body all assume that situation — which is why the template will land more naturally if you keep the structure and only change the content inside the brackets. Resist the temptation to rearrange paragraphs; the order they appear in is the order most invoice & billing letters readers expect, and reordering them quietly costs the letter some of its credibility.

The most common mistake people make when sending a ACH Authorization Reminder Letter is over-explaining. The recipient does not need the entire backstory; they need just enough context to act on the request, the notice, or the message. If you find your draft running long, look for paragraphs that exist only to justify the letter to yourself rather than to inform the reader, and cut them. A page is the natural ceiling for almost every invoice & billing letters, and most are stronger at half a page. Writers who want a deeper dive into the structural conventions can also consult the broader professional correspondence handbook we maintain for this category.

Finally, before you send, run through the small checklist that applies to every letter in this category: have you named the operative date, named the specific person or amount, set a clear next step, and signed with a real title? Those four items are what move a draft from a personal note into the kind of professional correspondence that gets taken seriously. The body below is already structured around them — just don't lose them in your edits.

About Invoice & Billing Letters in general

Most overdue invoices are not the result of refusal; they are the result of distraction. The job of a billing letter is to make the obligation easy to act on by being specific, polite, and unambiguous about the next step. The templates in this category move from the gentlest first reminder through formal demand letters, escalating in tone the way professional collections actually work. Each template includes the practical details a recipient needs to pay quickly: invoice number, amount, due date, and the specific payment method. The tone matters more than people expect — accusatory billing letters often delay payment because they trigger a defensive reply rather than a check. Stay polite through the first three rounds; reserve formal language for the demand stage when the relationship has already shifted.

For broader writing principles that apply to any letter in this category, see our Invoice & Billing Letters writing guide. You may also find our plain-language drafting reference useful when you want to tighten the prose further.

Fields you'll need

• Your Name
• Your Title
• Your Address
• Your Phone
• Your Email
• Date
• Recipient's Name
• Recipient's Title
• Recipient's Company
• Recipient's Address

Tips for sending this letter

1. Lead with the invoice number and amount — recipients pay the specific line first.
2. Offer at least two payment methods; friction is the enemy of collection.
3. Keep the first reminder explicitly cordial; many recipients pay within forty-eight hours.
4. Escalate language only at scheduled intervals — usually fourteen, thirty, sixty days.
5. Quote the contractual late-fee or interest provision before applying it.
6. Avoid threatening collections in the first two rounds; the threat loses force when overused.
7. Send each round through a channel that produces a verifiable record.

Why it matters that this is in writing

Of all the channels available for this kind of message — phone call, text, instant message, casual email — a written letter remains the most enduring choice when the matter has weight. A printed or PDF letter signals that you took the time to compose your thoughts, structure them, and put them in front of the recipient in a form they can return to later. That signal alone often shifts the tone of the response in your favor, because the recipient understands they're being asked to engage seriously rather than offer a quick reply.

It also creates a record. Six months from now, if you need to reference this exchange, you'll have an exact copy of what you said and when you said it. That matters most in situations involving employment, money, housing, and any contract — the kinds of situations where memory alone is not enough. Even when the recipient is a friendly party, the discipline of writing a real letter forces you to think through your position more carefully than a quick message ever would. That extra thinking is the real value of using a template like this one as a starting point: it gives you the structure, so you can focus on the substance.