E-invoicing mandates explained: what they mean for procurement teams

E-invoicing is the exchange of invoices as structured, machine-readable data that the buyer’s software can process without anyone retyping it. A PDF sent by email is not an e-invoice, and a growing number of governments now write that difference into law.

Electronic invoicing requirements change by country, by company size, and by whether a business sends an invoice or receives one. This guide explains what an e-invoicing mandate is, where the rules stand, and what procurement and accounts payable (AP) teams need to change when supplier invoices start arriving as data.

Key Takeaways

• E-invoicing is the exchange of invoices as structured data that software processes directly; a PDF sent by email does not qualify.
  
• Receiving duties often start before issuing duties: Germany has required every business to accept e-invoices since January 1, 2025.
  
• France requires every business to receive e-invoices from September 1, 2026; small, medium, and micro businesses issue them from September 1, 2027.
  
• The UK will mandate e-invoicing for all VAT invoices from April 2029, and EU cross-border digital reporting starts on July 1, 2030.
  
• For buyers, e-invoices change four accounts payable jobs: receiving, matching against the purchase order and goods receipt, approving, and storing.
  
• Prokuria’s Procurement Workflows module keeps each supplier invoice, its approval history, and the purchase orders and goods received notes behind three-way matching in one system.

What is e-invoicing?

E-invoicing is the issuing, sending, and receiving of invoices as structured data that passes directly from the seller’s software to the buyer’s. The European Commission defines an e-invoice as “an invoice that has been issued, transmitted and received in a structured data format which allows for its automatic and electronic processing”.

Structured data means that each detail on the invoice has its own labeled field, usually in a format called XML, so a computer knows which value is the total, which is the tax, and which is the due date.

Is a PDF an e-invoice?

No. A PDF is a picture of an invoice, made for people to read. A person or scanning software still has to pull the amounts and the tax out of it and enter them into the accounting system.

Some formats pair a readable PDF with the data file. In that case the data file is the invoice. Belgium’s official e-invoicing site says of domestic sales between businesses in 2026: “Sending a PDF invoice by e-mail or via a platform will no longer be enough.”

How e-invoicing works

An e-invoice travels from the seller’s software to the buyer’s software through a network or a government platform, and no one retypes it on the way. Most systems follow the same four steps:

1. The seller’s software creates the invoice as data, in a required format such as UBL (a widely used XML format for e-invoices).
2. The software checks it against the rules of that format, so a missing tax ID is caught before sending.
3. The invoice travels through an exchange network or a government platform.
4. The buyer’s software receives it and posts it for approval in AP, the team or person who receives, checks, and pays supplier invoices.

In much of Europe the network is Peppol, which lets different invoicing systems exchange e-invoices. You join through an access point, a certified provider that links your software to the network. Peppol has been run since 2012 by OpenPeppol, a non-profit association. Your invoicing software usually handles the connection.

What an e-invoicing mandate requires

An e-invoicing mandate is a law that requires businesses to issue or receive invoices in a set electronic format, often through a set channel. Some mandates cover only issuing, some cover only receiving, and many cover both on different dates.

Scope also depends on who the customer is. Rules for sales to other businesses (B2B), to government bodies (B2G), and to consumers (B2C) are usually written separately, so one company can be in scope for one kind of sale and out of scope for another.

Why governments are introducing e-invoicing mandates

Governments introduce e-invoicing mandates mainly to collect tax that is owed and goes missing. Most countries outside the US charge value added tax (VAT), a sales-type tax collected at each step of a sale, and VAT is reported from invoices. When invoices are paper or PDF, a tax authority sees them only in periodic returns and audits, which leaves room for fraud and for plain errors.

The amounts are large. The European Commission estimates that EU countries failed to collect €128 billion of the VAT they were owed in 2023, or 9.5% of the total liability. Structured invoices let a tax authority see transactions close to the time they happen and compare what the seller reports with what the buyer claims.

Businesses get something out of it too: an invoice that arrives as data costs less to process than one that has to be typed in.

The three types of e-invoicing mandates

E-invoicing mandates follow three basic models, which differ in the moment the tax authority sees the invoice.

Many countries combine models. For a buyer the model has one practical consequence. Under clearance, as in Italy, an invoice that the platform rejects has not been issued at all, so a data error on the supplier’s side can hold up the purchase and the payment. Under post-audit, the same error surfaces later.

Electronic invoicing requirements by country

Whether e-invoicing is mandatory depends on the country you and your trading partners are in, because no single global rule exists. Electronic invoicing requirements are set nation by nation, and they differ in who is covered, from what date, and for which kinds of sale. Here is where the three markets stand, starting with the US.

Is e-invoicing mandatory in the US?

No. The US has no federal e-invoicing mandate for sales between private businesses, so US suppliers can keep sending you PDF invoices. Two situations change that:

• You sell to federal agencies. Agencies that use the Invoice Processing Platform take invoices through it. The Treasury provides the platform at no cost to agencies and their vendors.
• You have customers, suppliers, or a legal entity in a country with a mandate. That country’s rules can apply to those invoices, and buyers there may ask for e-invoices even where the law puts no duty on you.

E-invoicing is also spreading in the US on a voluntary basis. In 2023, participants in a Business Payments Coalition pilot, convened with support from the Federal Reserve, launched an exchange framework for e-invoices and set up the Digital Business Networks Alliance to oversee it. Any business can use it through a service provider.

E-invoicing mandates in the UK and Europe: key dates

The UK will make e-invoicing mandatory for all VAT invoices from April 2029. The government confirmed the plan after a 2025 consultation and said it will publish an implementation roadmap at Budget 2026. That plan will set the details, so it is the document for UK businesses to watch.

In the EU, e-invoicing between businesses is optional unless the country you operate in requires it, and more countries do each year. An EU-wide rule is also on the way. Under the VAT in the Digital Age (ViDA) package, adopted in March 2025, digital reporting based on e-invoicing will apply to cross-border sales between businesses from July 1, 2030. Most national rules point to EN 16931, the European standard that defines which data an e-invoice must contain.

Dates have moved before in more than one of these countries, so check the official page for your country before you plan around a date.

What e-invoicing mandates mean when you are the buyer

Receiving obligations often start before issuing obligations, so the first deadline you meet under an e-invoicing mandate may be as a buyer. Three countries show the pattern:

• Germany: every business has had to be able to receive e-invoices since January 1, 2025. The duty to issue them starts in 2027 or 2028, depending on turnover.
  
• France: every business must be able to receive e-invoices from September 1, 2026. Small businesses issue them from September 1, 2027.
  
• Belgium: a business that sells only to private individuals does not send them e-invoices, but it must still be able to receive e-invoices from its suppliers.

For the buyer, an e-invoice changes four jobs in accounts payable and procurement:

1. Receive. Your system has to accept the data file through the network or platform the country uses. Prokuria takes supplier invoices in by import, ERP sync, OCR, or CSV.
2. Match. The invoice is checked against the purchase order (PO) and the goods receipt before anyone pays it, a check known as three-way matching. Structured data speeds this up only when your PO numbers and supplier records are accurate.
3. Approve. The invoice is routed to the right approver, with a clear path for invoices that do not match.
4. Store. E-invoices have to be kept so that you can retrieve any one of them in an audit.

Your suppliers need a few things from you as well: your correct tax ID, the address where your system receives e-invoices, and a PO number they can quote on every invoice. Hand these over early and fewer invoices bounce.

PDFs and e-invoices in the same inbox

Because smaller suppliers often start issuing later, a procurement team that buys from suppliers of different sizes will receive both formats for a while. In Germany, a supplier with prior-year turnover of €800,000 or less does not have to issue e-invoices until January 1, 2028, three years after its customers had to be able to receive them. In France, small, medium, and micro businesses issue from September 1, 2027, a year after the receiving date.

Both formats need the same checks before payment: a match against the purchase order and the goods receipt, and an approval. A PDF also needs its data taken off the page before those checks can run.

The work after an invoice arrives is the same whichever tool brings it in. In Prokuria’s Procurement Workflows module, every supplier invoice has one place to live with its approval history attached, approval flows route it to the right people, and it is matched against the purchase order and goods received note in the same system. On request, Prokuria also extracts the data from PDF invoices, so both formats go through the same checks.

Who has to comply with e-invoicing mandates

E-invoicing mandates usually cover small businesses too, often with a later start date than large companies. For a buyer, that means smaller suppliers may start sending e-invoices later than larger ones. Three questions, asked in this order, tell you whether a rule reaches your company:

1. Where is your business established or registered for VAT? That country’s rules apply to you directly.
2. Where are your suppliers and business customers? Their country’s rules can reach you through them. A supplier in a mandate country may have to send you e-invoices, and a customer there may need an e-invoice from you before it can process and pay your bill.
3. Do you sell to government bodies? Public-sector buyers often have their own e-invoicing rules. In the EU, every public administration must be able to receive e-invoices.

In the countries listed above, a lower turnover changes the timing more often than it removes the duty. France and Germany both gave smaller companies a later date for issuing e-invoices, while the duty to receive them applied to every business from the first day.

If you are based outside a country and have no branch or entity there, you are usually outside its domestic mandate. That pattern has exceptions, so check the official page of your customer’s country before you assume you are out of scope.

Penalties for not complying with e-invoicing rules

Penalties for breaking e-invoicing rules are set by each country and differ widely, so there is no single figure to plan around. The practical costs usually arrive before any fine. An invoice that does not meet the rules can be rejected by the platform or by your customer’s system. On the buying side, a supplier invoice that is rejected and sent again reaches your approval flow late, which can cost you an early-payment discount or push a payment past its due date.

Enforcement can start with some patience. Belgium applied no penalties for the new obligation during the first three months of 2026 for businesses that could show they had taken timely and reasonable steps to comply. It also refused a general postponement, because a delay would have been unfair to the businesses that were ready on time.

Benefits and challenges of e-invoicing for buyers

E-invoicing saves a procurement and AP team processing time and cost, and it asks for setup work first. The benefits are concrete:

• No retyping. Invoice data moves from system to system, which removes keying errors and the disputes they cause.
• Faster approval and payment. An invoice that arrives complete goes through your approval flow and on to payment sooner.
• Lower processing cost. One US federal agency cut the cost of processing undisputed invoices by 54% with the Invoice Processing Platform, according to the Treasury’s Bureau of the Fiscal Service. The Belgian government’s e-invoicing site cites studies that show a 75% saving against paper invoices, without naming them.
• Easier audits. Every invoice is stored as data and is quick to find.

Four challenges come with those benefits:

1. Software. Your accounting or AP system may need an upgrade or an add-on to receive and send the required format.
2. Data quality. Wrong tax IDs or addresses in your customer and supplier records cause rejections.
3. New routines. Staff have to learn how a rejected invoice is corrected and sent again.
4. Different rules per country, if you trade across borders.

What you pay depends on how many invoices you receive and send, how many countries your suppliers and customers are in, and whether your current software already supports the format. 

How procurement teams can prepare for e-invoicing mandates

To prepare for an e-invoicing mandate, find out which rules and dates apply to you, confirm that your software can send and receive the required format, and clean your customer and supplier data before you test. In order:

1. Run the three-question check above and write down each date that applies, for receiving and for issuing.
2. Ask your invoicing or accounting software provider which formats and networks it supports, and from when.
3. Clean your customer and supplier records: tax IDs, legal names, addresses, and the address where each partner receives e-invoices. A supplier portal where suppliers keep their own tax IDs and addresses current, such as Prokuria’s, takes part of that cleanup off your team. Add the date each supplier will start sending e-invoices to its supplier record, so your team knows which invoices will still arrive as PDFs.
4. Test with a few customers and suppliers before the deadline. Include a rejected invoice, so you know how a correction works.
5. Talk to your accountant about local exceptions.

Your team has three routes to choose from:

• The software you already use. Invoicing and accounting tools increasingly include e-invoicing or offer it as an add-on.
• An access point provider. This is a separate service that connects your existing system to Peppol or to a national platform.
• A free government tool. Some countries offer one. Poland’s national platform, for example, is free to use.

Whichever route you take, ask the provider four questions, and ask for a price based on your own invoice volume and countries:

• Does it produce the format my country requires?
• Does it connect to the required network or platform?
• Can I see the status of every invoice, including rejections?
• How are invoices archived, and for how long?

Archiving deserves a decision of its own, because each country sets how long invoices must be kept. For day-to-day work, an invoice repository with role-based access and a log of user activity, such as the one in Prokuria, keeps supplier invoices in one place and shows who did what with each one.

Book a demo to see how Prokuria keeps supplier invoices, purchase orders, and approvals in one place.

Conclusion

E-invoicing means invoices exchanged as structured data, and a PDF does not qualify. Whether a mandate applies to you depends on where your business is established and where your customers and suppliers are. In several countries the duty to receive e-invoices arrives before the duty to send them, so buyers have work to do first. Start with the three-question check, then ask your software provider which formats and networks it supports, and from when.