Free Debit Note Generator
Create a debit note when an invoice you already issued charged too little — missed freight, extra goods delivered, a pricing slip or short-charged tax. The note references the original invoice, explains the correction and produces a clean PDF your customer’s accounts team can match and pay. Everything runs in your browser; nothing is uploaded.
Seller and customer
Debit note details
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DEBIT NOTE
Additional amount owed against an earlier invoice.
Debit Note No: DN-001
Date: 13 Nov 2026
Due: 27 Nov 2026
Against invoice: INV-1042 dated 30 Oct 2026
From
Brightline Traders
22 Shahrah-e-Faisal, Karachi, Pakistan
accounts@brightline.example
To
Northwind Traders
Office 402, Trade Centre, Karachi, Pakistan
Reason: Freight or delivery not billed
Delivery charges for the October shipment were agreed in the order confirmation but were left off invoice INV-1042 in error. This note bills those charges only; no goods values are changed.
| Description | Qty | Unit price | Amount |
|---|---|---|---|
| Delivery — Karachi to Lahore, 1 truck | 1 | PKR 45,000 | PKR 45,000 |
| Loading and unloading labour | 1 | PKR 6,000 | PKR 6,000 |
SubtotalPKR 51,000
Total additional amount duePKR 51,000
Please pay this additional amount by the due date shown, quoting debit note DN-001 and original invoice INV-1042 with your payment.
Need to reduce an invoice instead? Use the free Credit Note Generator.
What a debit note is, and when you must issue one
A debit note is a formal correction document a seller sends when an invoice that has already been issued turns out to be too low. The original invoice stays exactly as it was — same number, same date, same amounts — and the debit note adds a second, separately numbered document that increases the customer’s balance by the difference. Together, invoice plus debit note equal the true value of the sale. This two-document trail is what accountants and tax auditors expect: a billing history where nothing is ever quietly edited after the fact.
The everyday triggers are mundane. A warehouse ships twelve cartons against an invoice written for ten. A courier charge that the customer agreed to bear never made it onto the bill. A price was keyed from last quarter’s rate card. Tax was charged at the standard rate when a higher rate applied, or an agreed surcharge for urgent work was forgotten. In each case the goods or services were genuinely supplied and genuinely owed — only the paperwork under-recorded them. The debit note fixes the paperwork.
Debit note vs credit note vs supplementary invoice
A credit note is the mirror image: it reduces a balance after returns, damage or overcharging, and it is also issued by the seller. Some businesses instead raise a supplementary or additional invoice for the missed amount. That can work commercially, but it blurs the trail — the customer’s system now holds two invoices for one delivery, and matching payments, stock and tax across them is harder. A debit note keeps the correction explicitly tied to the single original invoice it adjusts, which is why most accounting standards and tax administrations treat it as the cleaner instrument. Terminology also varies by side of the transaction: a buyer who discovers an undercharge may notify the seller with their own debit note as a request — but the seller’s document is the one that legally raises the amount owed.
What a debit note must contain
A defensible debit note carries: its own sequential number from a separate debit-note series; the issue date and a payment due date; the seller’s and buyer’s names and addresses; the number and date of the original invoice — without this link, the note is just an unexplained extra bill; a plain-language reason for the increase; an itemised list of the additional goods, services or charges with quantities and prices; the tax charged on the additional amount, at the same rate as the original invoice; and the total additional amount due. If your original invoice carried tax registration numbers, repeat them here too. Where the tax was the problem — a short-charged rate — state the original rate, the correct rate and the difference being billed, so the customer’s tax team can mirror the adjustment.
Bookkeeping, numbering and disputes
Keep debit notes in their own numbered series (DN-001, DN-002…) rather than mixing them into the invoice sequence, and record them in the same period you issue them — the additional output tax belongs to that period in most systems. Because a debit note asks a customer for more than the original bill, it is the document most likely to be queried: attach the evidence when you send it (the signed delivery note showing twelve cartons, the order email agreeing to freight, the corrected rate card) and reference the agreed facts in the explanation field. A customer who can see exactly why the extra amount is owed pays it; a customer who receives a bare number files it under disputes. Finally, never use a debit note to backdate a price increase the customer never agreed to — it corrects billing errors, nothing more, and using it as a renegotiation tool destroys trust and, in many jurisdictions, simply does not hold up.
Frequently asked questions
What is the difference between a debit note and a credit note?
They move an invoice balance in opposite directions. A credit note reduces what the customer owes — used for returns, damage or overcharging. A debit note increases what the customer owes — used when the original invoice charged too little, missed goods or services that were actually supplied, or short-charged tax. Both documents reference the original invoice and leave it untouched, so the audit trail always shows the original charge plus the correction, rather than a silently rewritten invoice.
Can I issue a debit note after the customer has already paid the invoice?
Yes, provided the extra amount is genuinely owed under the agreement — for example freight that was always chargeable but left off the invoice, or additional units the customer received and accepted. Send the debit note with a clear explanation and the evidence (delivery note, signed timesheet, agreed rate card). The customer then pays the difference as a separate balance. What you cannot do is invent new charges after payment that were never part of the deal; a debit note corrects billing, it does not renegotiate the price.
Does a debit note change the GST or VAT I owe?
Yes. A debit note that increases the taxable value of a supply normally increases the output tax on it, charged at the same rate as the original invoice and reported in the tax period in which the debit note is issued (the exact timing rule varies by country). That is why the tax rate and label on the debit note should match the original invoice, and why the note must carry its own sequential number and a clear reference to the invoice it corrects. This page is a document tool, not tax advice — for material amounts, confirm the treatment with your accountant.
Should the customer sign or accept the debit note?
A debit note is issued by the seller, so a customer signature is not usually a legal requirement. In practice, though, debit notes are disputed more often than invoices because the customer is being asked for more money than the original bill. Sending the note with the supporting evidence and asking the customer to acknowledge it in writing — even a reply email — dramatically reduces disputes and gives your accounts team something to chase against if payment stalls.
Can I use one debit note to correct several invoices?
It is much safer not to. Tax rules and customer accounts-payable systems both work invoice by invoice: each debit note should reference exactly one original invoice, so the correction, its tax and its payment can all be matched cleanly. If you under-billed three invoices, issue three debit notes. The few minutes saved by combining them are repaid many times over at audit or reconciliation time, when nobody can tell which part of a lump correction belongs to which sale.