The Email Matters as Much as the Invoice
You created an invoice. You attached it to an email. You wrote "Please see attached invoice" in the body and hit send. That works, technically. But a bare-bones email like that is easy to overlook, hard to act on, and does nothing to help you get paid faster.
The email accompanying your invoice is a real touchpoint with your customer. It sets the tone, provides clarity, and can be the difference between getting paid in three days or chasing payment for three weeks. Here's how to do it right.
What to Include in the Email Body
Your invoice email should cover four things in a short, scannable format:
- What this is — a brief reference to the order, project, or service
- The amount due — state it directly in the email so they do not have to open the attachment to know
- When it's due — the specific date, not just "Net 30"
- How to pay — list your accepted payment methods with the details they need
That's it. You don't need a long introduction. You don't need to recap the entire project. Keep the email short enough that someone can read it on their phone and know exactly what to do.
Subject Line Best Practices
Your subject line determines whether the email gets opened or buried. Here's what works:
- Include the invoice number: "Invoice #1042 from [Your Business Name]"
- Include the amount: "Invoice #1042 — $350.00 Due March 28"
- Keep it plain: Don't get creative. Invoice emails aren't marketing emails. Clear beats clever.
Avoid vague subject lines like "Invoice" or "Payment" — they look like spam and give the recipient no context. Including both your business name and the invoice number makes the email easy to find when the customer searches their inbox later.
PDF Attachment vs. Payment Link
You have two ways to share an invoice: attach a PDF to the email, or include a link where the customer can view and pay online. Each has its place.
PDF attachment works best when:
- Your customer is a business that needs the PDF for their records
- You're dealing with customers who prefer traditional formats
- You want them to have a permanent copy regardless of whether your invoicing platform changes
A payment link works best when:
- You want to reduce friction — one click to view and pay
- You accept online card payments
- You want to track whether the invoice has been viewed
The best approach is both. Attach the PDF and include a link if your invoicing tool provides one. That way, the customer can pay however they prefer. If you use OrderHelm to generate your invoices, you can export clean, branded PDFs and attach them directly to your email.
When to Send Your Invoice
Timing affects how quickly you get paid. Here are the general principles:
For completed orders or projects: Send the invoice the same day the work is done or the product is delivered. Every day you wait is a day the customer moves on to other things. The closer the invoice arrives to the moment they received value from you, the faster they'll pay.
For ongoing or milestone-based work: Send the invoice at the agreed-upon milestone. Don't wait until the entire project is done if you agreed to progress payments.
Time of day: Tuesday through Thursday mornings tend to get the fastest response. Monday inboxes are flooded, and Friday emails get pushed to "I'll deal with this next week." Sending at 9-10 AM in your customer's time zone puts your invoice near the top of their inbox when they sit down to work.
For recurring clients: Send on a consistent schedule. If you invoice monthly, send it on the same day every month. Consistency makes it routine for both of you.
Copy-Paste Email Templates
Here are three templates you can use right away. Adjust the details and make them sound like you.
Template 1: Initial Invoice
Subject: Invoice #[NUMBER] from [Your Business] — $[AMOUNT] Due [DATE]
Hi [Customer Name],
Thanks for your order. Please find invoice #[NUMBER] attached for $[AMOUNT].
Amount due: $[AMOUNT]
Due date: [DATE]Payment methods:
Venmo: @[handle]
Zelle: [email/phone]
PayPal: [email]
Check payable to: [Business Name]Please include the invoice number with your payment so I can match it to your order.
Let me know if you have any questions.
[Your Name]
[Your Business]
Template 2: Friendly Reminder (7 Days Past Due)
Subject: Friendly reminder — Invoice #[NUMBER] ($[AMOUNT]) past due
Hi [Customer Name],
Just a quick reminder that invoice #[NUMBER] for $[AMOUNT] was due on [DATE]. I've attached the invoice again for your reference.
If you've already sent payment, please disregard this email. Otherwise, I'd appreciate payment at your earliest convenience.
Payment methods:
Venmo: @[handle]
Zelle: [email/phone]
PayPal: [email]Thanks,
[Your Name]
Template 3: Final Notice (30 Days Past Due)
Subject: Action needed — Invoice #[NUMBER] is 30 days past due
Hi [Customer Name],
I'm following up regarding invoice #[NUMBER] for $[AMOUNT], originally due on [DATE]. This invoice is now 30 days past due.
I'd like to resolve this as soon as possible. If there's an issue with the invoice or you need to discuss a payment arrangement, please let me know. Otherwise, I'd appreciate payment within the next 5 business days.
I've attached the invoice again for your records.
Thank you,
[Your Name]
[Your Business]
[Phone Number]
The Follow-Up Sequence
Having a consistent follow-up process takes the emotion out of chasing payments. Here's a schedule that works for most small businesses:
- Day 0: Send the original invoice email
- Day 7 past due: Friendly reminder (Template 2). Keep it light. Most late payments at this stage are just oversight.
- Day 14 past due: Second reminder. Slightly more direct. "I want to make sure this didn't get lost in your inbox."
- Day 30 past due: Final notice (Template 3). Direct and professional. Mention you'd like to resolve it within a specific timeframe.
- Day 45+ past due: Phone call or text. Sometimes email just isn't getting through, and a short phone call resolves it in two minutes.
Most invoices get paid after the first or second reminder. The key is actually sending those reminders instead of sitting there hoping the customer remembers. Set calendar reminders for yourself so follow-ups happen on schedule.
Small Details That Make a Difference
Always include the invoice number in the body of the email. If the customer pays via Venmo or Zelle, they can reference the invoice number in the payment note, which makes matching payments to invoices simple.
Use a professional email address. Invoices from [email protected] carry more weight than invoices from [email protected]. If you have a domain for your business, set up email on it. Many domain registrars include basic email forwarding for free.
Don't apologize for sending invoices. Phrases like "Sorry to bother you" or "I hate to ask" undermine the fact that you did work and you deserve to be paid. State the amount, state the due date, and be polite but direct.
Reply to the original thread for follow-ups. When you send a reminder, reply to the original invoice email instead of starting a new thread. This gives the customer the full context without searching, and it shows the history of communication if you ever need to reference it.
BCC yourself. Keep a copy of every invoice email in your own inbox. This creates a record of exactly what you sent and when you sent it, which is useful for your own tracking and essential if a payment dispute ever arises.