Payment received lines come off the balance automatically, so enter them as positive amounts with the date they arrived.
Cedar Ridge, the Lindqvist account and all the amounts on screen are invented, there only to show how a finished notice looks. Your draft stays in this browser only.
A past due invoice points back to the original invoice number, issue date and due date, states how many days the bill is overdue, and shows the outstanding balance after any partial payments. Add a late fee or interest only if your contract or terms allowed it, then set a firm new pay by date. Mark whether it is a first reminder, a second reminder or a final notice, and finish with the total now due and the ways to pay.
How the past due invoice total is calculated
The past due invoice generator adds up what is still owed on the original bill, layers on any late fee or interest you are entitled to, then subtracts every payment that has already come in.
| What it covers | The math | |
|---|---|---|
| Original balance | The unpaid lines carried over from the first invoice | Quantity × price for each line |
| Other | Anything else owed on the same account, such as a later visit | Quantity × price |
| Overdue balance | The base any percentage fee or interest is worked on | Original balance + other, minus payments received |
| Late fee | A charge your contract or terms set for paying late | A flat amount, or your percentage × overdue balance |
| Interest | Simple interest at the yearly rate you agreed with the customer | Overdue balance × yearly rate × days past due ÷ 365 |
| Payment received | Partial payments, deposits or credits already paid | Taken off the charges |
| Total now due | What the customer has to pay by the new due date | Charges, less discount, plus any tax, minus payments received |
Worked example: an irrigation repair bill 30 plus days late, a $35 late fee from the signed terms, one partial check already banked, no interest and no sales tax
Filling in the past due invoice template
Four tabs take you from your own details to a finished overdue notice, and the preview beside them changes as you type.
- Your business: who you are, where to reach your accounts desk, and a tax ID if you print one.
- Customer and original invoice: who owes the money, plus the original invoice number, the date it went out and the date it was due. Days past due fills itself in from today's date, so you never have to count on a calendar.
- Reminder stage. Pick 1st reminder, 2nd reminder or final notice and the label prints on the invoice.
- Overdue charges: carry over each unpaid line as Original balance, then add any Late fee, Interest or Other line. Partial payments go in as Payment received lines with the date the money arrived; they are subtracted for you.
- Late fee and payment: instead of typing a fee line, you can apply a flat late fee or a percentage of the overdue balance, and a simple yearly interest rate that runs on the days past due. Leave both at zero unless your terms allow them.
- New due date and PDF. Choose how many days the customer has to pay, check the total now due, then press Download PDF for a one page notice.
What belongs on an overdue account invoice
A late customer should be able to see in seconds which bill this is, how late it is and exactly what clears it.
| Block | What it holds |
|---|---|
| Business details | Your business name, address, billing contact, tax ID and logo. |
| Client details | The customer's name, their business if they have one, address and contact. |
| Invoice information | A new invoice number for this notice, the issue date and the currency. |
| Past due details | Original invoice number, original issue and due dates, days past due and the reminder stage. |
| Outstanding charges | Each unpaid line from the first bill, plus any late fee, interest or other charge, with quantity, price and amount. |
| Summary | Charges, any discount or tax, payments received and the total now due, set in bold. |
| Additional information | The final pay by date, the late fee or interest terms you are relying on, how to pay and who to call about a dispute. |
Why are invoices important for past due accounts?
A text that says "just a reminder" is easy to ignore. A proper overdue invoice is harder to set aside and leaves a record.
- Clear amountsThe customer sees the old balance, every payment credited and the figure that settles it, which removes most "I thought I paid that" replies.
- Faster resolutionA dated document with a firm pay by date tends to get handled sooner than a casual nudge.
- A paper trailEach notice, with its stage and date, documents your attempts to collect if you later hand the account to an agency or go to small claims court.
- Professional toneA clean layout keeps the conversation about the bill, not about anyone's temper, which matters when you want the customer back next season.
Why use a past due invoice template?
Late money hurts cash flow, and chasing it by hand eats hours. A ready layout cuts both problems down.
- Time saved: formatting, the days past due count and every total are done for you.
- Fewer mistakes. Partial payments, percentage fees and interest are calculated the same way every time, so the customer cannot pick holes in the arithmetic.
- Fees you can defend: the late fee and interest fields stay at zero until you choose to use them, which nudges you to charge only what your terms say.
- Records: each PDF carries the original reference, so your books, an audit or a collections file all line up.
When should you send a past due invoice?
Send the first one as soon as the due date passes, then step up the tone with each notice instead of repeating the same message.
| Stage | Tone | What to add |
|---|---|---|
| 1st reminder | Friendly. Assume the bill was missed or misplaced. | The original invoice reference, the balance and a short new pay by date. |
| 2nd reminder | Firmer and more direct. | Days past due, any partial payments credited, a late fee if your terms allow one, and an offer to talk about a payment plan. |
| Final notice | Formal and specific. | A last date to pay and the next step you will actually take after it, such as pausing service or referring the account on. |
Only name a next step you are ready to follow through on; empty warnings make later notices weaker.
Can you add a late fee or interest to an overdue invoice?
Generally only when the customer agreed to it beforehand, in a contract, estimate or the terms printed on the original invoice. That is why both start at zero here.
| Point | What it means for your notice |
|---|---|
| Agreed terms first | Quote the fee or rate exactly as your terms state it, in the late fee or interest terms box, so the customer can see where the charge comes from. |
| State rules set the ceiling | Limits on late fees and interest rates come from state law and vary by state and by type of customer, so check your own state before choosing a figure. |
| Collecting your own invoices | The federal Fair Debt Collection Practices Act defines a debt collector as someone who collects debts owed to another, and it excludes a creditor's own staff collecting in the creditor's name. A business billing its own customers is generally outside that definition. |
| Consumer or business customer | The same Act only covers debts for personal, family or household purposes. Once you pass a homeowner's account to an outside agency, that agency has to follow it. |
Past due invoice vs regular invoice vs collection notice
Three documents, three moments in the life of an unpaid bill.
| Document | When | What it does |
|---|---|---|
| Regular invoice | When the work is done | The first request for payment, with a due date. |
| Past due invoice | After that due date passes | Restates the balance, adds days overdue and any agreed late charges, and sets a new pay by date. |
| Collection notice | After your own reminders fail | A formal demand, often from a collection agency or attorney, that may come with legal requirements of its own. |
Industry specific tips for past due invoicing
Whatever you sell, these habits get more overdue bills paid without souring the relationship.
- Reference the original invoiceRepeat its number and dates so the customer can find it in their own records straight away.
- Stay polite, be clearPlain wording about the amount and the date works better than pressure.
- State the consequenceSay what happens after the final date, whether that is a late fee under your terms, a pause in service or referral to collections, and keep it consistent across customers.
- Make paying easyList every method you accept. A short instalment plan often recovers more than one more stern letter.
- Call before the final noticeA two minute phone call can surface a lost invoice or a wrong address.
Every hour spent chasing an old bill is an hour your phone goes unanswered.
New customers rarely leave a voicemail; they call the next business you can find. ServiceAgent answers each caller, asks what the job is and books it into your calendar, so fresh work keeps arriving while you settle the accounts that are running late.
Book a free demoFrequently asked questions
Short answers on overdue invoices, late charges and using this generator.
Book a free demoWhat should a past due invoice include?
Your details and the customer's, a new invoice number, the original invoice number with its issue and due dates, days past due, each unpaid line, any late fee or interest your terms allow, payments already received, the total now due, a new pay by date and how to pay.
When should you send a past due invoice?
The day after the due date passes, or within a few days of it. Follow with a second reminder and then a final notice if the balance stays open.
What's the difference between a past due invoice and a regular invoice?
A regular invoice asks for payment the first time. A past due invoice says that payment is now late, points back to the original bill and may add charges the customer agreed to.
How is a past due invoice different from a collection notice?
You send a past due invoice yourself as a reminder. A collection notice is a more formal demand, usually sent after your own reminders fail and often by an agency or attorney.
How do I format a past due invoice correctly?
Put the past due label, reminder stage and new invoice number at the top, the original invoice details just below, then the unpaid lines, payments credited and the total now due in bold, with the pay by date and payment methods underneath. This generator lays it out in that order.
Should I use a past due invoice template or generator?
Blank layouts are fine if you only chase one bill a year. A past due invoice generator counts the days overdue, subtracts partial payments, works out any fee or interest and saves a PDF, which matters once you have several late accounts.
How does a past due invoice generator work?
You enter your business, the customer and the original invoice, list what is unpaid and what has been paid, and choose any late fee, interest and the new due date. The total now due updates as you type, and Download PDF saves the notice.
How long does it take to create a past due invoice with a generator?
About two minutes when the original invoice is in front of you, since most of the work is copying its lines across.
How do I word a final notice?
Keep it short and factual: the balance, the original invoice number, how many days late it is, a last date to pay and the step you will take after that date. Pick Final notice as the stage so the label prints on the invoice.
Should partial payments appear on the notice?
Yes. Listing each payment with its date shows the customer you have credited everything, and it stops arguments about the remaining balance.
Is my past due invoice saved or sent anywhere?
No. Nothing leaves your device; the draft lives in local browser storage until you press Reset.
Leads growth and product marketing for ServiceAgent at SaaS Labs, where he has worked in product marketing since 2020. Writes ServiceAgent's coverage of AI call answering, CRM and home services operations.
Published by ServiceAgent, the AI front office for service businesses. This page is a billing aid, not legal advice. Whether you can charge a late fee or interest, and how much, depends on your agreement with the customer and your state's law, so check with an attorney or your state's consumer protection office before adding one.