Mandatory e-invoicing (EHF) from 2027: What Norwegian businesses need to do now

From 1 January 2027, it becomes mandatory for all Norwegian businesses to send and receive e-invoices in EHF format. The government presented the legislative proposal on 17 March 2026, accelerated from the original 2028 timeline. The requirement affects 99 percent of Norwegian businesses and requires a digital accounting system that can handle EHF automatically.

For many businesses, this means a significant transformation in how invoices are sent, received, and processed. It is no longer sufficient to send PDFs by email or paper invoices by post. All businesses — with very few exceptions — must transition to structured, machine-readable invoicing via the PEPPOL network.

In this article, we provide a complete overview of what the new requirement entails, who is affected, and what concrete steps you should take now to be ready in time.

What is EHF and e-invoicing?

EHF stands for Elektronisk Handelsformat (Electronic Trading Format) and is the Norwegian standard for electronic exchange of business documents. The format is based on the international PEPPOL standard (Pan-European Public Procurement Online) and is already used at scale between the private sector and the public sector in Norway.

An e-invoice in EHF format is not the same as a PDF sent by email. Where a PDF is a visual document intended for human reading, an EHF invoice is a structured XML document that can be read, validated, and processed automatically by the recipient's accounting system — without manual handling.

How does PEPPOL work?

PEPPOL is the international network that transports EHF documents between sender and recipient. Think of it as a secure highway for business documents:

1. Sender creates an e-invoice in their accounting system
2. The invoice is sent via the sender's PEPPOL access point (typically provided by the accounting software vendor)
3. The document is routed through the PEPPOL network to the recipient's access point
4. Recipient receives the invoice automatically in their accounting system

Digitaliseringsdirektoratet (the Norwegian Digitalisation Agency) manages the Norwegian PEPPOL infrastructure and approves access point providers. Most Norwegian accounting systems — such as Tripletex, Fiken, and PowerOffice — are already connected to the PEPPOL network and serve as access points for their users.

What distinguishes EHF from a regular invoice?

Property	Paper/PDF invoice	EHF e-invoice
Format	Visual document (paper or PDF)	Structured XML (machine-readable)
Delivery	Post, email, or file transfer	Automatic via the PEPPOL network
Receipt	Manual entry in accounting system	Automatic import and matching
Validation	Manual verification	Automatic validation against standard format
Processing time	Days to weeks	Seconds to minutes
Error rate	High (manual keystrokes)	Very low (machine processing)
Archiving	Physical or digital folder	Automatic in the accounting system

What does the new legislative proposal say?

On 17 March 2026, the government presented a legislative proposal making e-invoicing in EHF format mandatory between all Norwegian businesses — including pure B2B transactions (business-to-business). The proposal is part of the government's broader digitalisation strategy and builds on the experience from mandatory e-invoicing to the public sector, which has been required since 2012.

The core of the proposal

The legislative proposal contains three main elements:

1. Mandatory e-invoicing between businesses from 1 January 2027 All Norwegian businesses shall send and receive invoices in EHF format via the PEPPOL network. The requirement applies to both B2B and the already existing B2G requirement (business-to-government).

2. Mandatory digital bookkeeping from 1 January 2030 By 2030, all bookkeeping shall be conducted digitally. This means that paper-based accounting systems and manual vouchers will be phased out entirely.

3. Accelerated timeline Originally, the e-invoicing requirement was planned for 2028. The government has accelerated this by one year based on assessments of the maturity level in Norwegian business and the significant socioeconomic benefits.

Why is the government accelerating the requirement?

The government estimates that mandatory e-invoicing will yield a socioeconomic benefit of NOK 10 billion over 20 years. The benefits come primarily from:

• Reduced time spent on manual invoice handling
• Fewer errors and fewer payment delays
• Lower costs for postage, paper, and archiving
• Better basis for automatic auditing and tax reporting
• Increased digitalisation of Norwegian business in general

The experience from mandatory e-invoicing to the public sector has been very positive. Municipalities report dramatically reduced processing times and fewer errors, and the government wants to realise the same benefits across the entire private sector.

Timeline: From B2G to full digitalisation

The transition to mandatory e-invoicing does not happen overnight. Here is the complete timeline:

• 2012: Mandatory e-invoicing to public sector (B2G) introduced
• 2012–2025: Increasing number of businesses adopt EHF voluntarily in B2B transactions
• 17 March 2026: Government presents legislative proposal for mandatory B2B e-invoicing
• 2026 (spring/summer): Legislative proposal processed by Stortinget (the Norwegian Parliament)
• 1 January 2027: Mandatory e-invoicing between all Norwegian businesses takes effect
• 2027–2029: Transition period for digital bookkeeping
• 1 January 2030: Mandatory digital bookkeeping takes effect

In other words, there are less than nine months from the legislative proposal to the requirement taking effect. For businesses that do not yet have an accounting system with EHF support, it is urgent to get started.

Who is covered by the requirement?

The short answer: almost everyone. The legislative proposal affects an estimated 99 percent of Norwegian businesses, including sole proprietorships, small and medium-sized enterprises, and large corporations.

Business type	Covered?	Notes
Limited companies (AS)	Yes	All, regardless of size
Sole proprietorships (ENK)	Yes	If revenue exceeds NOK 50,000
General partnerships (ANS/DA)	Yes	All, regardless of size
Foundations	Yes	If they conduct business activities
Associations	Yes	If they have VAT-liable revenue
Public sector entities	Yes	Already covered since 2012
Foreign companies with Norwegian branch	Yes	If they invoice Norwegian customers
Businesses below NOK 50,000 revenue	No	Only exempted group

Who is exempt?

The exemption is very limited: only businesses with annual revenue below NOK 50,000 are exempt. In practice, this means hobby businesses and entirely marginal traders are excused, but everyone else — from freelancers and sole proprietorships to large corporations — must comply with the new requirement.

There are no exemptions based on industry, number of employees, or type of business beyond the revenue threshold.

What does this mean in practice for your business?

For most Norwegian businesses, the new requirement involves four concrete changes:

1. You need an accounting system that supports EHF

Your system must be able to generate EHF invoices and send them via PEPPOL. It must also be able to receive EHF invoices from your suppliers and import them automatically. If you already use Tripletex, Fiken, PowerOffice, or similar cloud-based systems, you likely already have this functionality available.

2. You must be registered in ELMA

ELMA (Elektronisk Mottakeradresseregister / Electronic Recipient Address Register) is the Norwegian registry of businesses that can receive electronic documents. For other businesses to send you e-invoices, your business must be registered here with the correct organisation number and document types.

3. Internal processes must be adapted

E-invoicing changes the workflow. Invoices that were previously scanned, manually entered, or sent as PDF attachments by email will now flow automatically into the accounting system. This means you need to adapt approval routines, controls, and attestation flows to the new digital workflow.

4. Existing integrations must be updated

If you have custom systems — such as CRM, order management, project management tools, or an online store — that generate invoices, these must be updated to produce EHF format and send via PEPPOL. This is often the most demanding part of the transition for businesses with bespoke solutions.

How to integrate with accounting systems?

Most Norwegian businesses use cloud-based accounting systems that already have built-in EHF support. The challenge arises when you have custom systems that need to be connected to the accounting system.

Tripletex

Tripletex has a well-documented API that supports creation, sending, and receipt of EHF invoices. The integration typically works as follows:

• Invoices are created via API with structured customer data, line items, and VAT information
• Tripletex generates the EHF document and sends it via PEPPOL
• Incoming EHF invoices can be retrieved via API and matched against purchase orders
• Payment status and bookkeeping data are synchronised automatically

Fiken

Fiken offers a REST API with good EHF support. The system is particularly popular among smaller businesses and sole proprietorships:

• Simple invoice creation via API with automatic EHF generation
• Automatic matching of payments against issued invoices
• Incoming e-invoices are imported directly into the system
• Bank connection for automatic reconciliation

PowerOffice Go

PowerOffice Go is aimed at accounting firms and medium-sized businesses:

• Comprehensive API with support for the entire invoicing and accounting cycle
• Automatic EHF sending and receiving via built-in PEPPOL access point
• Advanced reporting capabilities and auditor integration
• Supports automatic account allocation and accruals

What if you have a custom-built invoicing system?

Many businesses have their own systems — order management, project management, or online stores — that generate invoices. For these, there are two main paths:

Option 1: Integrate with the accounting system Let the custom system create invoices via the accounting system's API. The accounting system handles EHF generation and PEPPOL delivery. This is the simplest solution for most businesses.

Option 2: Direct PEPPOL integration For larger businesses with high invoice volumes, it may be relevant to integrate directly with a PEPPOL access point. This requires more development but gives full control over the entire invoice flow.

Regardless of which path you choose, it is crucial that the integration handles errors, logging, and retry mechanisms robustly. An invoice that fails to arrive is worse than no invoice — because the sender believes it has been delivered.

What benefits does e-invoicing provide?

Mandatory e-invoicing is not just about complying with a requirement. For businesses that embrace the change, the benefits are significant:

Benefit	Description	Typical impact
Faster payment	E-invoices are received and processed immediately, reducing processing time and resulting in faster payment	Average 5–10 days shorter payment time
Fewer errors	Machine processing eliminates typing errors, incorrect amounts, and missing VAT lines	Up to 80% reduction in invoice errors
Automatic matching	Incoming invoices can be automatically matched against purchase orders and goods receipts	Eliminates manual review for standard invoices
Reduced manual work	No scanning, manual entry, or email handling of invoices	50–80% reduction in time spent per invoice
Lower cost per invoice	Elimination of postage, paper, envelopes, and manual processing	From NOK 80–100 to under NOK 10 per invoice
Better liquidity overview	All invoices are structured and available in real time	More precise cash flow management
Easier auditing	Fully digital, traceable archive with standardised format	Reduced audit time and cost
Environmental benefit	Elimination of paper, postage, and transport	Reduced carbon footprint from administration

For a typical Norwegian SME that sends and receives 200 invoices per month, the transition to e-invoicing can free up 20–40 hours per month in administrative tasks. That is time that can be spent on value-creating work instead.

What challenges and pitfalls should you be aware of?

While the benefits are clear, it is important to be aware of common challenges businesses face during the transition to e-invoicing:

Systems that don't talk to each other

The most common pitfall is assuming that "my accounting system supports EHF, so I'm ready". In reality, many businesses have parallel systems — CRM, order management, online stores, project management tools — that also generate invoices. All of these must either be integrated with the accounting system or support EHF directly.

Poor data quality

EHF has strict requirements for data format. Customer data must contain correct organisation numbers, VAT numbers, and PEPPOL addresses. Addresses, references, and line amounts must follow a defined format. Businesses with "messy" master data will find that invoices are rejected or fail validation.

Resistant internal culture

The transition to e-invoicing requires employees to change work habits. Accounting staff who have been scanning and manually entering invoices for years must adapt to new approval workflows. Without proper training and clear communication, resistance can become a real obstacle.

Suppliers who are not ready

Even though the requirement applies to everyone, there will inevitably be suppliers who are not ready by the deadline. You should have a plan for handling a transition period where you receive both EHF invoices and (for a brief period) manual invoices.

Insufficient testing period

A common mistake is waiting too long with implementation and thus losing the opportunity to test thoroughly. EHF integration should be tested with real business partners well in advance of the requirement taking effect.

Practical steps: How to prepare your business

Here is a phased checklist to ensure your business is ready by 1 January 2027:

Phase 1: Assessment and evaluation (now — June 2026)

• Map all systems that send or receive invoices in your business
• Check whether your accounting system supports EHF sending and receiving
• Verify that your business is registered in ELMA with the correct organisation number
• Identify custom systems (CRM, order management, online store) that generate invoices
• Assess the data quality in your customer and supplier registers (organisation numbers, PEPPOL addresses)
• Map internal approval and attestation flows that will be affected

Phase 2: Adaptation and integration (June — October 2026)

• Upgrade or switch accounting system if it does not support EHF
• Implement integration between custom systems and the accounting system for EHF generation
• Clean up master data — ensure correct organisation numbers, VAT numbers, and PEPPOL addresses
• Adapt internal approval routines to automatic invoice receipt
• Contact key customers and suppliers to clarify EHF readiness
• Set up automatic matching of incoming invoices against purchase orders

Phase 3: Testing and rollout (October — December 2026)

• Send test EHF invoices to selected customers and verify they are received correctly
• Test receipt of EHF invoices from suppliers and check automatic import
• Run parallel operations for a period (EHF + legacy routines) to verify everything works
• Conduct training for all staff who work with invoicing and accounting
• Establish procedures for error handling and manual override when needed
• Document the new invoice flow and update internal guidelines

Phase 4: Go-live and optimisation (January 2027 onwards)

• Activate EHF as the default invoicing method for all customers
• Monitor delivery rates and error messages during the first month
• Follow up with customers and suppliers who are not yet ready
• Optimise the degree of automation based on experience from the first operating period
• Begin planning for mandatory digital bookkeeping by 2030

How we can help

At UNOS SOFTWARE AS, we have extensive experience integrating Norwegian accounting systems, payment solutions, and business systems into cohesive, automated workflows. Together with our partner Unos IT AS, we can provide end-to-end assistance from development to operations and support. The e-invoicing requirement is fundamentally an integration problem — and integration is something we do every day.

We help Norwegian businesses with:

• System integration with accounting systems — through our system integration service, we connect your existing systems (CRM, order management, online stores, project management tools) with Tripletex, Fiken, PowerOffice, or other accounting systems so that EHF invoices are generated and sent automatically
• Technical consulting and assessment — our consulting service helps you map the current situation, identify gaps in the system landscape, and create a plan for EHF readiness
• Development of bespoke solutions — through our software development service, we build EHF integrations and automation solutions tailored to your business needs and existing systems
• Cloud and infrastructure optimisation — our cloud and infrastructure service ensures your integrations run reliably, scale when needed, and are well-monitored

We have, among other things, built payment and accounting integrations in our own product Splice, where we connected Vipps, Dintero, and accounting systems in one seamless flow. We bring those experiences to all integration projects.

The e-invoicing requirement is part of a broader regulatory wave — also read about the Cyber Resilience Act and the EU Data Act, which impose new requirements on Norwegian software and technology companies.

Unsure whether your business is ready for the e-invoicing requirement? Get in touch for a no-obligation conversation about EHF readiness and integration needs. We help you find the fastest and most cost-effective path to full compliance.

Frequently asked questions about mandatory e-invoicing

What is the difference between EHF and a PDF invoice?

EHF is a structured, machine-readable XML format that is sent via the PEPPOL network and imported automatically into the recipient's accounting system. A PDF invoice is a visual document that requires manual processing. Only EHF fulfils the new legal requirement.

When does e-invoicing become mandatory between businesses?

The government has proposed that mandatory e-invoicing (EHF) between all Norwegian businesses takes effect on 1 January 2027. Digital bookkeeping becomes mandatory from 1 January 2030.

Is my business exempt from the e-invoicing requirement?

Only businesses with annual revenue below NOK 50,000 are exempt. All others — including sole proprietorships, limited companies, and associations with VAT-liable revenue — must send and receive EHF invoices.

What does it cost to get started with e-invoicing?

For businesses that already use cloud-based accounting systems like Tripletex, Fiken, or PowerOffice, the EHF functionality is usually included. Costs arise primarily for businesses with custom-built systems that need integration with an accounting system or PEPPOL access point.

What happens if my business is not ready by 1 January 2027?

The legislative proposal is still being processed, and final sanction mechanisms have not been determined. It is reasonable to expect that Skatteetaten (the Norwegian Tax Administration) and supervisory authorities will enforce the requirement, and that non-compliance may result in orders and potential fines.

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Sources and further reading

• Finansdepartementet (2026). "Lovforslag om obligatorisk e-faktura mellom næringsdrivende." regjeringen.no
• Digitaliseringsdirektoratet (2026). "PEPPOL og EHF — veiledning for norske virksomheter." digdir.no
• Digitaliseringsdirektoratet (2026). "ELMA — Elektronisk mottakeradresseregister." elma.difi.no
• Finansdepartementet (2026). "Samfunnsøkonomisk analyse av obligatorisk e-faktura." regjeringen.no
• PEPPOL (2026). "PEPPOL BIS Billing 3.0 — Specification." peppol.eu
• Tripletex (2026). "EHF-fakturering — kom i gang." tripletex.no
• Fiken (2026). "Sende og motta e-faktura (EHF)." fiken.no
• PowerOffice (2026). "EHF og e-faktura i PowerOffice Go." poweroffice.no
• OpenPEPPOL (2026). "What is PEPPOL?" peppol.org

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Get in touch

Need help with EHF integration, system adaptation, or accounting connections? UNOS SOFTWARE AS — in partnership with Unos IT AS — has extensive experience with integration against Tripletex, Fiken, PowerOffice, and the PEPPOL network. Send us an enquiry through the contact form — we help you find the fastest path to full e-invoicing readiness.