How to send e-invoice to AGD?

How to send e-invoice to AGD?

In this help page you will find the steps on sending the invoice you created in QuickBooks Online as an e-invoice to AGD.

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Before creating the invoice in your accounting software, please see below points and make sure you have the required Customer/UEN enabled via the My Network page in your Link4 account.

1. Sub-BU Code and Customer Codes To send an e-invoice to AGD, it is essential to use the correct sub-BU code. Please consult your client agency for their specific sub-BU code. Alternatively, you can retrieve customer codes used for invoicing purposes by referring to the List of Ministries / Statutory Boards. If you are unsure which codes to use, confirm with your customer (i.e., the client’s agency) before submitting your invoice.

2. Mandatory Fields for eInvoice Submission Ensure that all mandatory fields are completed when sending an eInvoice to AGD. These fields include:

  • Attention To

  • Invoice Date: Cannot be backdated by more than 7 calendar days or forward-dated.

  • Invoicing Instruction ID (II ID) / Purchase Order ID (PO ID): Include this if invoicing against an II/PO.

  • Invoice Description

Failure to fill out these mandatory fields may result in rejection of your eInvoice.

3. Requirements and Best Practices The eInvoice Submission Guide provides detailed requirements and recommendations (Pages 5 to 13). Key highlights include:

  • Limits on backdated and forward-dated invoices.

  • Character limits for various fields.

  • Proper format and structure for eInvoice data.

4. Business Units in JSON Format You can access a list of business units in JSON format for integration purposes. This resource can be helpful for users who need to automate or validate customer codes programmatically.

5. Invoice Line Number For eInvoices billed against an Invoicing Instruction (II) or Purchase Order (PO), the Line Number of the II/PO should be captured in the eInvoice and sent using the OrderLineReference field. This ensures that your eInvoice aligns with the II/PO issued by the client agency.

6. Submission Channel To ensure your eInvoice is sent via InvoiceNow and not through email, update your submission channel settings as instructed by IMDA. Consult IMDA’s guidelines for configuring your system to use InvoiceNow. This step is crucial for compliance with AGD's eInvoicing process.

7. IMDA Guidelines Link4 users can follow these IMDA guidelines to ensure proper eInvoice submission:

  • Verify that your system is InvoiceNow-ready.

  • Configure the correct submission channel to align with InvoiceNow requirements.

  • Follow IMDA-provided documentation for troubleshooting and further instructions.

By adhering to these guidelines and ensuring accuracy in your eInvoice submissions, you can streamline the invoicing process and minimize delays or rejections.


Step 1: Create the invoice as you normally would in QBO then click "Save & Send".



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AGD allows only one attachment per transaction.

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The invoice will be listed in your LinkFor account under the Invoices page with "Update Missing Info" stage. When an Invoice to AGD UEN SGUENT08GA0028A or SGTSTT53201802A is created, you will have the option to update the Business Unit via LinkFor. 

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Business Unit is the "Buyer Reference" field in LinkFor which you can update along with Payment Terms when the invoice is in the Missing Info stage. The Business Unit is a 5-character code. To know which Business Unit to indicate, please enquire with your client agency.

Step 2: Please click on the Update Missing Info button to update the required details through the pop-up as shown below.


Step 3: Lastly, click on Update button and the invoice will be sent to AGD shortly.

Should you require any support with these steps, please submit a ticket - we are here to assist you.

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