SFE Compliance

SFE Contingency Mode: What to Do When SIAT Goes Down

Bolivia's SFE system needs a live connection to validate an invoice. When the internet drops or SIAT stops responding, your customer is still standing at the counter. Here's the legal way to keep selling.

By Contably · September 14, 2026 · 8 min read

Every Bolivian business on the Sistema de Facturación Electrónica eventually hits the same moment: a customer is ready to pay, and the system won't issue an invoice. The connection is down, or SIAT isn't responding, or the power went out twenty minutes ago and the router hasn't come back.

The instinct is to improvise — write something by hand, promise to send the factura tomorrow, or simply take the cash and sort it out later. All three create problems that are far more expensive than the outage itself.

Bolivian tax regulation anticipated this. There is a defined procedure for invoicing when the system is unavailable, and businesses that know it in advance handle an outage in minutes. Businesses that don't are the ones reconstructing a week of sales from memory.

Why SFE breaks in the first place

Understanding which component failed determines what you're allowed to do next. There are three distinct scenarios, and they are not interchangeable.

⚠️ The three failure scenarios
1. Your connectivity fails — internet out, router down, no signal at a mobile point of sale
2. SIN's service fails — SIAT is unreachable or returns errors for everyone, not just you
3. Your own system fails — your device, your software, or your electricity

All three are recognized situations, but the documentation you produce and the way you later justify the gap differ. A nationwide SIAT outage is easy to evidence. A failure confined to your own shop puts the burden on you to show what happened and when.

What contingency invoicing actually means

Contingency mode does not mean "stop invoicing." It means you shift to issuing invoices offline, under an authorization your system obtained in advance, and then transmit them to SIN once service is restored.

Three codes do the work, and it's worth knowing what each one is for:

CUIS — Código Único de Inicio de Sistemas
Issued once when your invoicing system is first authorized. It identifies your system to SIN. You rarely touch it after setup.
CUFD — Código Único de Facturación Diaria
A daily code your system requests from SIN to issue invoices that day. This is the one that matters during an outage: if your system already holds a valid CUFD, it can keep generating invoices offline.
CAFC — Código de Autorización de Facturación por Contingencia
The authorization used specifically for contingency events. It's requested in advance and held in reserve, so it's available precisely when you have no connection to request anything.
The key insight: contingency codes must be obtained before the outage. You cannot request an authorization from a system you cannot reach. A business that has never requested a CAFC has no contingency option at the moment it needs one — which is why this is a setup task, not an emergency task.

What to do during an outage, step by step

1
Confirm the scopeCheck whether the failure is yours or SIN's. If other businesses and the SIN portal are also down, note the time — you'll want it for your records.
2
Switch to contingency issuanceYour system issues invoices offline using the CUFD or CAFC it already holds. The customer receives a valid document with the required fiscal data and QR — not a handwritten note.
3
Record the start and end time of the eventLog when the outage began and when service returned. This is the evidence that justifies why a batch of invoices was transmitted late rather than issued late.
4
Keep the sequence intactDo not restart numbering, skip numbers, or issue a parallel set of documents. Gaps in the sequence are one of the first things a review looks for.
5
Transmit as soon as service returnsSend the accumulated invoices to SIN within the window the current normativa allows. Do not wait until the end of the month.
6
Verify every invoice was acceptedTransmission is not acceptance. Check the response for each document and resolve any rejections immediately, while you still remember the sale.
Confirm the current deadlines with your accountant. The transmission window for contingency invoices, and the exact documentation required to justify an event, are set by SIN resolution and have been revised more than once. The procedure above is stable; the specific number of hours is the part to verify against the normativa in force.

The four mistakes that turn an outage into a fine

1. Handwritten invoices with no fiscal basis

A note on a receipt pad is not an invoice. The customer cannot use it for crédito fiscal, and you have no valid record of the sale. If the customer is a business, you have also just cost them 13% of the purchase — which is how a connectivity problem becomes a client relationship problem.

2. "We'll send the factura tomorrow"

Issuing the invoice on a later date, with a later date on it, misstates when the sale occurred. It shifts revenue into the wrong period and creates a mismatch between your sales records and your declared IVA.

3. Selling without documenting anything

The sale still happened. Cash still entered the business. If the deposit appears in the bank and no invoice corresponds to it, the gap is visible in any reconciliation — and unexplained revenue is a harder conversation than a documented outage.

4. Transmitting late, or not at all

Contingency invoicing is a delay, not an exemption. Offline invoices that are never transmitted look identical to invoices that were never issued. This is the most common failure, because once the crisis passes, nobody remembers there's a queue waiting to be sent.

How to be ready before it happens

An outage is a fifteen-minute inconvenience for a prepared business and a two-week cleanup for an unprepared one. The difference is four things done in advance:

  1. Make sure contingency authorization is in place and that whoever operates the register knows it exists.
  2. Test it once. Disconnect the internet deliberately on a quiet afternoon and issue a test invoice. Finding out your contingency path doesn't work is far better on a Tuesday than during a Saturday rush.
  3. Write down the procedure in one page and keep it physically near the point of sale. The person on shift during the outage may not be you.
  4. Use a system that queues and transmits automatically so the backlog doesn't depend on someone remembering.
How Contably handles this: Contably maintains valid daily codes and contingency authorization in the background, switches to offline issuance automatically when SIAT is unreachable, and queues every invoice for transmission. When service returns, the queue is sent and each acceptance is confirmed — without anyone on your team having to notice the outage started or remember that it ended.

Keep invoicing when the connection doesn't

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