IMSS addenda for CFDI 4.0

Invoice IMSS with its addenda in CFDI 4.0, from the web portal or through the API.

Industry: Government
Price: $555 MXN per year, VAT included. No Premium needed.
With Premium: Included, along with every addenda in the catalog
Variants and group companies: Proveedor · Servicios

The IMSS logo belongs to its owner and is shown only to identify the company. Factura Digital is not affiliated with IMSS.

What the IMSS addenda is

It is a block of commercial data that IMSS asks for inside your invoice XML to find their order and pay you. It goes after the stamp, so it doesn't change the CFDI's validity with the SAT.

Government agencies and state-owned companies receive the invoice together with contract and delivery data. The addenda puts that data inside the XML so the payments team can check it without separate documents.

Data it usually asks for

Contract or order number
Supplier code or number
Receiving area, unit or warehouse
Delivery note or receipt number
In healthcare, sometimes the supply code

Each company defines its own addenda. The exact fields are in the manual your buyer or the IMSS accounts payable team gives you.

How to invoice IMSS with its addenda

01
Get a quote
Tell us you invoice IMSS. An advisor goes over the manual or XSD schema your buyer gave you.
02
We set it up
We get the IMSS addenda ready in your account, for $555 per year or included in Premium.
03
Invoice and deliver
When you invoice you fill in the data IMSS asks for and the XML goes out with its addenda, ready for their portal or mailbox.

One addenda or all of them

See pricing See the addenda catalog

If you only invoice with the IMSS addenda, you pay $555 per year, VAT included, with no subscription. If you invoice several companies with addendas, Premium includes all of them for $450 per month.

Questions about the IMSS addenda

What people ask us most before invoicing with an addenda.

Ask an advisor

How much does the IMSS addenda cost?

$555 per year, VAT included, and you don't need Premium. If you invoice several companies with addendas, Premium includes all of them for $450 per month or $4,500 per year. Either way, each CFDI uses one stamp from your package.

Does the IMSS addenda affect the stamp?

No. The addenda goes in the cfdi:Addenda node, outside the original string, so the SAT doesn't check it and it doesn't change the seal or the Timbre Fiscal Digital. IMSS checks it.

What data do I need to invoice IMSS?

Whatever its addenda manual asks for. In government and state-owned companies it is usually: contract or order number; supplier code or number; receiving area, unit or warehouse; delivery note or receipt number; in healthcare, sometimes the supply code.

How do I turn on the IMSS addenda?

Get a quote from an advisor. They go over the IMSS manual or XSD with you, we set it up in your account and let you know when it is ready to invoice.

Can I invoice IMSS from my ERP?

Yes. With API v5, included in the service, your system sends the CFDI data and the addenda data in the same request and gets back the stamped XML with the addenda. You can also invoice from the web portal without integrating anything.