Credit Notes & Debit Notes: Sale vs Refund Explained

TL;DR: Credit note vs debit note in fiscalization

• Invoice: fiscalized as a Normal Sale.
• Credit Note: fiscalized as a Normal Refund referencing the original fiscal Sale.
• Debit Note: represented as an additional Normal Sale linked to the original Sale.
• Negative Xero or MYOB credit notes: are not sent as negative fiscal Sales and are ignored by the FiscoBridge cloud integration.
• To fiscalize a credit note with FiscoBridge: open the FiscoBridge Client Portal, find the original fiscal Sale and create a Refund from that invoice.

The key principle is simple: a reduction of an earlier Sale is a Refund, while an increase is another Sale.

Why credit notes and debit notes look different after fiscalization

Accounting software and fiscalization systems do not always use the same document terminology.

In accounting software, businesses may work with documents such as:

• Invoice
• Credit Note
• Debit Note
• Credit Memo
• Adjustment
• Refund

The fiscal transaction model used by Fiji VMS, Samoa TIMS and Vanuatu VSMS is based primarily on an invoice type and a transaction type.

For normal commercial transactions, the important combinations are:

• Normal Sale – records a sale and increases the relevant fiscal amounts and tax liability.
• Normal Refund – reduces or reverses an earlier Sale and decreases the relevant fiscal amounts and tax liability.

This means that an accounting Credit Note is not simply sent to the fiscalization system as a document called “Credit Note”. The integration must translate the accounting adjustment into the fiscal transaction expected by the tax system.

What are Normal Sale and Normal Refund transactions?

The fiscal transaction type determines whether the fiscal invoice increases or decreases the taxpayer's fiscal totals.

This is why a Credit Note and Debit Note normally move in opposite directions:

Credit Note
↓
Reduces original invoice
↓
Normal Refund

Debit Note
↓
Increases original invoice
↓
Normal Sale

How is a credit note fiscalized?

A Credit Note normally reduces an amount that was previously invoiced to a customer.

A business may create a Credit Note because:

• Goods were returned.
• The customer was overcharged.
• Part of a service was cancelled.
• A discount was agreed after the original invoice.
• The original quantity needs to be reduced.
• The original price needs to be reduced.

In the fiscal transaction model used by Fiji VMS, Samoa TIMS and Vanuatu VSMS, this reduction is represented by a Normal Refund.

Accounting Credit Note
        ↓
Normal Refund
        ↓
Reference to original fiscal Sale

The Refund becomes a new fiscal invoice with its own fiscal invoice number. At the same time, it references the original fiscal Sale being adjusted.

This reference is especially important because the fiscal system needs to know which previous Sale the Refund relates to.

Why are negative quantities and amounts not fiscalized directly?

Accounting systems such as Xero and MYOB may represent a Credit Note using negative quantities, negative amounts or other negative accounting values.

For example, an accounting Credit Note might contain:

Credit Note CN-001

Accommodation adjustment
Quantity: -1
Amount: -$200

The fiscal transaction model does not represent this adjustment by creating a Normal Sale containing negative quantities or negative Sale amounts.

Instead, the transaction direction is defined by the fiscal transaction type itself:

• Sale increases the fiscal amount.
• Refund decreases the fiscal amount.

The correct fiscal representation is therefore:

Original invoice
Normal Sale
$200
        ↓
Credit required
        ↓
Normal Refund
$200
Reference: Original fiscal Sale

The amount on the Refund is represented as the amount being refunded. The Refund transaction type provides the negative fiscal effect.

What happens to negative invoices in FiscoBridge integrations?

For FiscoBridge cloud integrations, invoices or credit note documents containing negative quantities or negative amounts that cannot be submitted as a valid fiscal Sale are ignored for automatic fiscalization.

This is intentional. FiscoBridge does not try to convert a negative accounting invoice into an invalid negative fiscal Sale.

The user should instead create the fiscal Refund from the original Sale in the FiscoBridge Client Portal.

How do I process a credit note with a FiscoBridge integration?

If an invoice has already been fiscalized through a FiscoBridge cloud integration and the business later needs to issue a Credit Note, the fiscal Refund should be created from the original Sale in the FiscoBridge Client Portal.

The recommended workflow is:

1. Create or record the Credit Note in Xero, MYOB or your ERP system as required for your accounting records.
2. Log in to the FiscoBridge Client Portal.
3. Open the fiscal invoice journal.
4. Search for the original Sale invoice that needs to be credited.
5. Open the original fiscal Sale.
6. Select the Refund option.
7. Enter or select the items and amounts that need to be refunded.
8. Submit the Refund.

FiscoBridge then creates a new Normal Refund using the original fiscal invoice as the reference.

Xero / MYOB
Credit Note CN-001
        ↓
Not automatically sent as a negative Sale

FiscoBridge Client Portal
        ↓
Find original fiscal Sale
        ↓
Select Refund
        ↓
Normal Refund
        ↓
Reference to original fiscal Sale

This allows the accounting system and fiscalization system to use the document model that is appropriate for each system:

• Xero, MYOB or the ERP system can retain the Credit Note for accounting purposes.
• The fiscalization system receives a Normal Refund.
• The Refund is correctly connected to the original fiscal invoice.

This workflow also avoids relying on negative accounting values that cannot simply be submitted as a fiscal Sale.

How is a debit note fiscalized?

A Debit Note generally has the opposite effect of a Credit Note. Instead of decreasing an earlier invoice, it increases the amount charged to the customer.

A business might issue a Debit Note because:

• An item was undercharged.
• An additional fee needs to be added.
• The quantity on the original invoice was too low.
• An additional service needs to be charged.
• A price correction increases the amount payable.

Because the adjustment increases the value of the sale, it can be represented through an additional Normal Sale.

Accounting Debit Note
        ↓
Additional Normal Sale
        ↓
Reference to original fiscal Sale

In the FiscoBridge integration workflow, the relationship with the original transaction can be retained so the additional Sale can be traced back to the original invoice.

Businesses should distinguish this integration workflow from the mandatory Refund reference rule. Official fiscal documentation specifically requires references for Refund transactions. The treatment of an additional Sale should follow the applicable jurisdiction requirements and the integration design.

Why does the original fiscal invoice reference matter?

Once an accounting invoice has been fiscalized, there are two different invoice identifiers to consider:

• The invoice number from the accounting system, such as INV-1001.
• The fiscal SDC Invoice Number generated during fiscalization.

When a Refund is issued, the fiscal system requires a reference to the fiscal document being refunded.

For example:

Accounting invoice:
INV-1001

Fiscalized as:
Normal Sale

Fiscal invoice:
ABC12345-XYZ67890-123

If a Credit Note is later required:

Accounting Credit Note:
CN-001

Fiscalized as:
Normal Refund

Reference:
ABC12345-XYZ67890-123

The Refund reference therefore points to the fiscal invoice, not only to the invoice number used internally by Xero, MYOB or another ERP.

This is one reason the easiest workflow for FiscoBridge cloud integration users is to locate the original Sale in the FiscoBridge Client Portal and create the Refund directly from that invoice. FiscoBridge already knows the fiscal invoice that needs to be referenced.

Is the Reference Number mandatory for a Refund?

Yes. The official fiscal documentation states that a Reference Number is mandatory for Refund transactions.

For a Normal Refund relating to an earlier Sale, the reference identifies the original fiscal invoice being refunded.

Example: invoice, credit note and debit note

Original invoice

A business creates an invoice in its accounting software:

Invoice INV-1001
        ↓
Normal Sale
        ↓
Fiscal invoice ABC-123

Credit Note

The business later needs to reduce the original invoice by $100.

The accounting software may create:

Credit Note CN-001
Amount: -$100

FiscoBridge does not fiscalize this as a Normal Sale for -$100.

Instead, the user finds the original Sale in the FiscoBridge portal and creates:

Normal Refund
Amount: $100
Reference: ABC-123

The fiscal Refund transaction provides the reducing effect.

Debit Note

If the business instead discovers that another $100 should have been charged:

Debit Note DN-001
        ↓
Normal Sale
$100
        ↓
Linked to original Sale ABC-123

The Debit Note increases the sale, so an additional Sale is used rather than a Refund.

Does this apply to Fiji VMS, Samoa TIMS and Vanuatu VSMS?

Yes. The Sale and Refund transaction model described in this article is relevant to the fiscalization systems currently used in Fiji, Samoa and Vanuatu.

How does a credit note work in Fiji VMS?

Fiji VMS distinguishes between Sale and Refund transaction types. A Normal Sale increases tax liability, while a Normal Refund decreases it.

For a Credit Note that reduces a previously fiscalized Sale, the fiscal adjustment should therefore be represented as a Normal Refund.

FRCS VMS documentation also states that the Reference Number is mandatory for Refund transactions. The Refund must identify the original fiscal invoice.

For businesses using FiscoBridge integrations in Fiji, a negative Xero or MYOB Credit Note is not automatically sent as a negative fiscal Sale. The user should locate the original fiscal Sale in the FiscoBridge Client Portal and create the Refund there.

How does a credit note work in Samoa TIMS?

Samoa TIMS uses the same core Sale and Refund transaction distinction.

Samoa's official TIMS documentation states that a Reference Number is always mandatory for Refund transactions. This allows the Refund to identify the original fiscal invoice that is being reduced.

For FiscoBridge integration users, the practical workflow is therefore the same: find the original fiscal Sale in the FiscoBridge Client Portal and issue the Refund from that transaction.

How does a credit note work in Vanuatu VSMS?

Vanuatu VSMS also uses Sale and Refund fiscal transactions. A Credit Note reducing an earlier Sale should be represented through the appropriate Refund workflow rather than by submitting a negative Sale.

The original fiscal transaction remains important because the Refund needs to be associated with the Sale being adjusted.

FiscoBridge users can create the fiscal Refund directly from the original fiscal Sale in the Client Portal.

How do Xero and MYOB credit notes work with FiscoBridge?

Xero, MYOB and other accounting applications can continue to use their normal Credit Note functionality for accounting purposes.

However, the accounting representation and the fiscal representation are different.

If Xero or MYOB creates a credit adjustment with negative quantities or negative amounts, FiscoBridge does not attempt to fiscalize that document as a negative Normal Sale.

Instead:

1. The negative document is ignored for automatic fiscalization.
2. The Credit Note can remain in Xero or MYOB for accounting purposes.
3. The user logs in to the FiscoBridge Client Portal.
4. The user searches for the original fiscal Sale.
5. The user selects Refund.
6. FiscoBridge creates the Normal Refund with the correct reference to the original fiscal invoice.

This separation is important because it allows each system to use its own correct document model without creating duplicate or invalid fiscal transactions.

Businesses using FiscoBridge accounting software integrations should include Credit Note and Refund testing as part of their implementation process.

What should POS and ERP developers consider?

Credit Notes and Debit Notes require additional integration logic because the adjustment often depends on a transaction that was fiscalized earlier.

A POS, ERP or accounting integration should be able to:

• Identify whether an adjustment increases or decreases an earlier Sale.
• Distinguish an ordinary Sale from a Credit Note or Debit Note.
• Retain the fiscal SDC Invoice Number returned for the original transaction.
• Identify the original fiscal Sale when a Refund is required.
• Create a Normal Refund for a Credit Note.
• Include the required original fiscal invoice reference on the Refund.
• Avoid sending negative quantities or negative amounts as an ordinary fiscal Sale.
• Support partial Refunds where required.
• Avoid processing the same adjustment more than once.
• Keep accounting and fiscal documents traceable.

For businesses using an existing POS or ERP system, FiscoBridge SDC can provide the fiscalization layer while the existing system remains responsible for the business workflow.

For supported cloud accounting systems, FiscoBridge cloud integrations provide the connection between the accounting platform and the relevant fiscalization system.

Common credit note and debit note fiscalization mistakes

Sending a Credit Note as a negative Sale

A Credit Note should not be represented by simply changing the original Sale values to negative quantities or negative amounts.

The fiscal adjustment should be represented using a Refund transaction.

Expecting a negative Xero or MYOB Credit Note to fiscalize automatically

For FiscoBridge cloud integrations, negative Credit Note documents are ignored for automatic fiscalization when they cannot be submitted as a valid fiscal Sale.

The user should instead find the original Sale in the FiscoBridge Client Portal and create a Refund.

Creating a Refund without the original fiscal invoice

A fiscal Refund needs a reference to the fiscal document that is being refunded.

Knowing only that Credit Note CN-001 relates to accounting invoice INV-1001 is not enough if the integration does not know which fiscal invoice was created from INV-1001.

Using the accounting invoice number as the fiscal Reference Number

The accounting invoice number and fiscal SDC Invoice Number are different identifiers.

The fiscal Refund must use the appropriate fiscal reference required by the system.

Treating a Debit Note as a Refund

A Debit Note normally increases the amount payable. It therefore should not be treated in the same way as a Credit Note that decreases the original Sale.

An additional Normal Sale can be used for the upward adjustment.

Assuming these rules apply to every country

This article describes the transaction model currently relevant to Fiji VMS, Samoa TIMS and Vanuatu VSMS.

Other fiscalization systems may define dedicated Credit Note and Debit Note fiscal document types or impose different reference requirements.

Not testing partial Credit Notes

A Credit Note does not always reverse the full invoice. Businesses and software vendors should test:

• Full Refunds
• Partial Refunds
• Single-item Refunds
• Quantity reductions
• Price reductions
• Multiple Credit Notes against the same Sale
• Different VAT or tax treatments

Which FiscoBridge solution supports this workflow?

FiscoBridge provides different fiscalization options depending on where your invoices are created.

For cloud accounting integration users, the important Credit Note workflow is:

Original invoice in accounting software
        ↓
FiscoBridge fiscalizes Normal Sale
        ↓
Credit Note later required
        ↓
Accounting Credit Note may contain negative values
        ↓
Negative document is not automatically fiscalized
        ↓
Open FiscoBridge Client Portal
        ↓
Find original fiscal Sale
        ↓
Create Refund
        ↓
Normal Refund references original Sale

Frequently asked questions

How does a credit note work in Fiji VMS?

A Credit Note that reduces an already fiscalized Sale is represented as a Normal Refund in Fiji VMS. The Refund references the original fiscal invoice. If you use a FiscoBridge cloud integration, find the original Sale in the FiscoBridge Client Portal and create the Refund from that invoice.

How does a credit note work in Samoa TIMS?

A Credit Note reducing a previous Sale is represented using a Refund transaction. Samoa TIMS documentation states that the Reference Number is mandatory for Refund transactions, allowing the Refund to identify the original fiscal invoice.

How does a credit note work in Vanuatu VSMS?

A Credit Note that reduces a previously fiscalized Sale is represented through the Refund transaction workflow in Vanuatu VSMS. For FiscoBridge integration users, the Refund can be created from the original fiscal Sale in the Client Portal.

Does a Credit Note need to reference the original fiscal invoice?

Yes. When a Credit Note is represented as a Normal Refund, the Refund needs to identify the original fiscal invoice being reduced. The fiscal reference is based on the fiscal invoice identifier rather than only the invoice number used in the accounting system.

Why was my Xero or MYOB Credit Note not fiscalized?

Xero and MYOB may represent Credit Notes using negative quantities or negative amounts. These values are not sent by FiscoBridge as a negative Normal Sale. FiscoBridge therefore ignores such documents for automatic fiscalization. To create the fiscal adjustment, log in to the FiscoBridge Client Portal, find the original fiscal Sale and select Refund.

Do I need to create the Refund in FiscoBridge if I already created a Credit Note in Xero?

Yes, for the FiscoBridge cloud integration workflow described here. The Xero Credit Note records the accounting adjustment, while the corresponding fiscal adjustment is created by finding the original fiscal Sale in FiscoBridge and issuing a Normal Refund.

Do I need to create the Refund in FiscoBridge if I already created a Credit Note in MYOB?

Yes. If MYOB records the Credit Note using negative values, that document is not automatically fiscalized as a negative Sale. Find the original fiscal invoice in the FiscoBridge Client Portal and create the Refund from there.

Can I send a negative quantity to Fiji VMS, Samoa TIMS or Vanuatu VSMS as a Credit Note?

A Credit Note should not be represented by sending an ordinary Sale with negative quantities or negative amounts. The fiscal transaction model represents the reduction using the Refund transaction type.

How is a Debit Note fiscalized?

When a Debit Note increases the value of an earlier Sale, it can be represented as an additional Normal Sale. In the FiscoBridge integration workflow, the relationship with the original fiscal Sale can be retained for traceability.

Is Credit Note a separate fiscal invoice type?

Not in the transaction model described in this article. Credit Note is accounting terminology. The corresponding fiscal adjustment is represented through a Normal Refund.

Is Debit Note a separate fiscal invoice type?

Not in this fiscal transaction model. A Debit Note is an accounting document. Where it increases the value of an earlier transaction, it can be represented as an additional Normal Sale.

What is the Reference Number on a fiscal Refund?

The Reference Number identifies the previously issued fiscal invoice being refunded. It allows the fiscalization system to connect the Refund to the original Sale.

Can I use the Xero or MYOB invoice number as the fiscal Refund reference?

The accounting invoice number and fiscal invoice number are different identifiers. The Refund must contain the fiscal reference required by the fiscalization system. Creating the Refund from the original Sale in the FiscoBridge Client Portal ensures that the correct fiscal transaction is referenced.

Can a Credit Note partially refund an invoice?

Where the business workflow supports a partial adjustment, only the relevant items or amount should be refunded. Businesses should test partial Refund scenarios before relying on an automated or integrated workflow.

Can I issue more than one Credit Note against the same invoice?

Businesses may have workflows involving multiple adjustments to an original invoice. Each fiscal Refund needs to be processed correctly and linked to the appropriate fiscal transaction. Complex adjustment workflows should be tested before production use.

Do these Credit Note and Debit Note rules apply to every fiscalization system?

No. This article specifically describes the Sale and Refund model currently used for Fiji VMS, Samoa TIMS and Vanuatu VSMS. Other countries may use dedicated Credit Note and Debit Note fiscal document types or different reference rules.

Official sources

Businesses and software vendors can review the official fiscal transaction and reference rules in the relevant tax-system documentation:

• Fiji VMS – Invoice and Transaction Types
• Fiji VMS – Reference Number
• FRCS – VMS Phase 3 Guide
• Samoa TIMS – Invoice and Transaction Types
• Samoa TIMS – Reference Number
• Vanuatu VSMS – Invoice and Transaction Types
• Vanuatu VSMS – Reference Number

Businesses should check the latest guidance from their local tax authority and confirm unusual accounting adjustment workflows with their accountant, tax adviser or fiscalization provider.