Architecture
How does South Africa's five-corner e-Invoicing model work?
How suppliers, buyers, their service providers, and the SARS service-provider corner could exchange and report structured e-Invoices.
Direct answer
The proposed five-corner model consists of the supplier, the supplier's service provider, the buyer's service provider, the buyer, and SARS's service provider. It is decentralised: business systems interact through service providers while VAT-relevant information can be reported to SARS through the network.
Source: VAT Modernisation (South African Revenue Service).
What matters in practice
- The model is decentralised rather than a single government invoicing network.
- Accredited service providers are part of the proposed end state.
- Large businesses may connect ERP systems through a service provider.
- Accreditation and final technical rules are not presented here as complete.
The five corners
Corner one is the supplier, corner two its service provider, corner three the buyer's service provider, corner four the buyer, and corner five the SARS service-provider side.
Where middleware can fit
An integration layer can prepare source data, apply mappings and pre-validation, route messages to the selected service-provider path, and return status to ERP and POS systems. That is readiness architecture, not a claim of current network access or accreditation.
Use the model name precisely
South Africa five-corner e-Invoicing model and SARS five-corner model are common ways to describe the proposed arrangement. DCTCE e-Invoicing South Africa and decentralised clearance South Africa refer to the same broad architectural direction, but final participant duties still need official definition.
Readiness questions
- Which system owns the invoice?
- Which future service-provider relationship is assumed?
- What status returns to supplier and buyer systems?
- Which VAT-relevant subset may be reported?
Questions teams ask
Does the five-corner model define today's production interfaces?
No. It explains the proposed participant model. Interface contracts and recognition requirements still need official confirmation.
Sources: VAT ModernisationFrequently Asked Questions on VAT ModernisationConsultation Paper on VAT Modernisation. Used for factual background only.