Mandatory E-Invoicing in Angola: What Changes in Every Oil and Gas Supplier's ERP | Blog

# Mandatory E-Invoicing in Angola: What Changes in Every Oil and Gas Supplier's ERP

TL;DR: Since January 1, 2026, large taxpayers, State suppliers, and any taxpayer issuing invoices worth 25 million Kwanzas or more must use certified electronic invoicing software approved by AGT — a threshold that a single drilling mobilisation, offshore logistics contract, or FPSO maintenance invoice clears easily, meaning most relevant suppliers to Angola's oil and gas sector are already in scope.

Why this matters to anyone supplying the oil and gas industry

An MRO supplier servicing a platform, a logistics company invoicing equipment mobilisation to an offshore block, or an EPC contractor working for an operator in Cabinda or Kwanza-Baixo is not a "small taxpayer" from a tax-compliance standpoint — even when it is an Angolan local-content SME. A single invoice for pipe transport, generator rental, or inspection services easily exceeds 25 million Kwanzas. That places the supplier squarely inside the scope of mandatory electronic invoicing from January 1, 2026 — not in 2027, when the regime extends to the general taxpayer population.

This article summarises, based on official sources and tax advisory firms tracking the rollout, what Angolan law actually requires, the real deadlines (including a delay that has already happened once), and what this means architecturally for anyone operating or integrating an ERP at a supplier, contractor, or operator in the sector.

The legal basis: what Presidential Decree 71/25 actually is

The core instrument is Presidential Decree No. 71/25, of 20 March 2025, which approves the new Legal Framework for Invoices ("Regime Jurídico das Facturas", RJF). The RJF entered into force on 20 September 2025 and sets out, among other matters, the rules for issuing, rectifying, cancelling, retaining, and archiving invoices and other fiscally relevant documents, the associated penalty regime, and the "Factura Premiada" mechanism — a prize draw designed to incentivise end consumers to request invoices.

A second, technical decree — Executive Decree No. 683/25, of 22 August 2025 — defines the invoicing software's data structure and the electronic invoice model, i.e. the specifications software vendors (including ERP integrators) must meet to obtain AGT validation.

It is worth confirming this directly because the keyword "Decreto Presidencial 71/25" circulates widely — and is correct, but only makes full sense read together with Executive Decree 683/25, which is the document that actually specifies the required technical format.

The real timeline — including the postponement

The date that appears most often is January 1, 2026. That is not the diploma's original date: the RJF initially envisaged mandatory e-invoicing starting around 22 September 2025. AGT postponed the rollout after testing, weeks before the planned date, showed that the overwhelming majority of software submitted for certification failed compliance testing. Between October 1 and December 31, 2025, a transition period applied during which affected taxpayers could continue issuing non-electronic invoices without penalty.

The phased timeline, as communicated by AGT and reported by Angolan business media, is:

Phase	Who is covered	Date
Phase 1	Large taxpayers (registered with the Large Taxpayers Tax Office), State suppliers, and taxpayers issuing invoices worth ≥ 25 million Kwanzas	January 1, 2026
Phase 2	Remaining taxpayers under the General and Simplified VAT regimes	12 months after Phase 1 — publicly communicated as January 1, 2027

Transparency note: the original RJF text set the second phase at 12 months after the regime's entry into force (which would point to September 2026), but with the effective rollout pushed to January 2026, the most recent public communication from AGT and the press points to January 2027 as the generalisation date. As of this publication, no diploma fixes that second date with the same formality as the original Decree 71/25 — so any company that only falls into "Phase 2" should confirm the exact date with AGT or a tax advisor before locking in its own implementation timeline.

What AGT actually requires

Three requirement blocks matter to anyone designing or operating an ERP:

1. Software validated or certified by AGT. Article 17 of the RJF is explicit: taxpayers must use invoicing software validated or made available by the General Tax Administration (Administração Geral Tributária). The transition was anything but smooth: the 500-plus software packages already certified under the VAT regime did not meet the new regime's technical requirements, and weeks before the original start date virtually all AGT-accredited software had failed — which is why the mandate was postponed. In mid-December 2025, AGT published a list of 43 certified e-invoicing software packages. Certification under the old regime does not carry over: check your software against AGT's current list before assuming you are covered.

2. Technical requirements for the electronic invoice. Sequential, chronological numbering, a per-document hash code, near-real-time transmission capability to AGT, and an automatic block on issuing further invoices after 60 days without successful communication with AGT's systems. That last point has a direct impact on remote operations — more on this below.

3. Archiving and retention. Invoices and other fiscally relevant documents must be retained for the periods set out in the General Tax Code (Código Geral Tributário), with digital backup copies available for immediate consultation whenever AGT requests them.

On top of this sits SAF-T (AO): the accounting SAF-T file becomes mandatory for annual submission by April 10, covering the prior fiscal year's data, and the inventory SAF-T file has a standard deadline of February 15 of the following year (for fiscal year 2025, AGT extended this deadline to April 15, 2026). Neither file is limited to taxpayers already in Phase 1 of e-invoicing — both apply more broadly across the General and Simplified VAT regimes. There is, however, a timing exception worth knowing: AGT made submission of the accounting file for the 2025 financial year optional and penalty-free, with the obligation instead applying to the 2026 financial year, filed in 2027 (KPMG Angola). The inventory file gets no such grace.

The reinforced penalty regime

The RJF tightened non-compliance penalties into a tiered structure:

7% of the value of an unissued invoice's underlying transaction, rising to 15% for repeat offences (more than five instances);
5% of the invoice value for omitting mandatory elements — price, taxpayer identification, address, or identification of the certified software used;
1% for other, less critical missing mandatory information;
0.2% of invoice value for late issuance;
A fine of 600,000 Kwanzas per period levied on software producers themselves where a failure to submit the SAF-T file stems from errors attributable to them. The same fine covers non-compliance with other obligations under the decree, and is reduced by 50% for a first offence.

For an oilfield services supplier issuing dozens of high-value invoices a month — equipment mobilisation, drilling services, offshore accommodation, marine transport — these percentage-of-transaction-value penalties, rather than a flat symbolic fine, make non-compliance genuinely expensive, not merely an administrative annoyance.

What this actually changes in ERP architecture

Wise Hustlers builds and operates its own energy-sector ERP, covering procurement, MRO, project contracts and supplier management — that engineering experience is what we are drawing on here, not a client project. Angola's e-invoicing mandate is not a "new form field" problem; it is a systems-architecture requirement, for four concrete reasons:

1. The 25-million-Kwanza threshold catches almost all relevant sector business. At current exchange rates, that is a modest dollar figure — enough to cover a single crane mobilisation, one month of offshore catering, or an invoice for critical spare parts. That means sales invoicing modules, procurement modules (invoices from suppliers effectively acting as indirect "State suppliers" via operator contracts), and intercompany invoicing (cash calls, joint interest billing between consortium partners) all need to be capable of generating validated electronic invoices now, not "eventually."

2. The 60-day no-communication block is a real operational risk in an offshore context. Remote logistics bases, platforms, and fields in areas with unstable connectivity cannot rely on a permanently synchronous link to AGT to keep invoicing. That forces the integration to be designed as a resilient queue-and-retry layer — generate and sign the invoice locally, queue it for transmission, confirm AGT's receipt, and alert operations well before the 60-day cutoff approaches — instead of assuming a synchronous API call at the moment of issuance.

3. Software certification is not a vendor footnote — it is an architecture decision. When virtually the entire estate of software certified under the previous regime failed the new regime's tests, and December 2025's certified list ran to 43 entries, choosing (or building) the invoicing module of an ERP for the Angolan oil and gas sector requires treating AGT certification with the same rigour as any critical compliance integration — tested, documented, and isolated in its own layer rather than hard-coded into the ERP core, so that a future AGT specification change does not force a rewrite of the whole system.

4. SAF-T and e-invoicing share data but not deadlines or logic. A well-designed ERP extracts both the accounting SAF-T and the inventory SAF-T from the same transactional database that generates electronic invoices — avoiding the manual reconciliation between two separate systems, which is where most compliance errors happen in practice.

It's also worth noting that, for suppliers to Angola's oil and gas sector, AGT certification for e-invoicing is a separate obligation from ANPG (Agência Nacional de Petróleo, Gás e Biocombustíveis) certification, required of any entity providing services to the petroleum sector under the local content regime (Presidential Decree No. 271/20 and Instructive No. 6/21). These are two distinct certification processes, with two different bodies, with different requirements — and both need to be in place before a supplier can invoice an operator or concessionaire without friction.

This kind of integration work — between tax requirements, sector-specific requirements, and the core architecture of an oil and gas ERP — is what we work on in custom software engagements for the sector. Any effort or timeline estimate for a project like this depends on the client's current systems — there is no single number that applies to every company, and any figure we do give is Wise Hustlers' own estimate, not an industry average.

Frequently Asked Questions

Is electronic invoicing already mandatory for all companies in Angola?

No. Since January 1, 2026, it is mandatory for large taxpayers, State suppliers, and taxpayers issuing invoices worth 25 million Kwanzas or more. Extension to the general population of taxpayers under the General and Simplified VAT regimes is expected, per AGT's public communication, around 12 months later — referenced as January 1, 2027, though this date deserves confirmation with AGT as it approaches.

What exactly counts as "AGT-certified invoicing software"?

It is software whose data structure and invoicing model have been validated by the General Tax Administration under Executive Decree No. 683/25 — capable of generating invoices with sequential numbering, a hash code, and transmission to AGT, and subject to an automatic block if it goes 60 days without communicating with AGT's systems. As of December 2025, only 21 solutions from 16 vendors appeared on the official certified list.

Is an oilfield services supplier billing under 25 million Kwanzas per invoice exempt?

It falls outside Phase 1 only if, in addition to not reaching that per-invoice value, it is also not classified as a large taxpayer or a direct State supplier. In practice, many service contracts with oil operators — even from local-content SMEs — exceed this threshold on a single invoice, which puts them in scope already in 2026.

Does AGT certification replace ANPG certification for oil and gas suppliers?

No. These are distinct regimes: AGT certification concerns the tax validity of the invoicing software; ANPG certification (under the local content regime) concerns the company's eligibility to provide services to the petroleum sector. A sector supplier needs to handle both separately.