Invoicing guides for small businesses
Mandatory details, deposits, credit notes and e-invoicing: invoices that are right the first time.
An invoice is a legal and tax document: a missing detail can cost a fine, and a mistake can only be fixed with a credit note. These guides take each situation in turn: what every invoice must show, how to invoice a deposit and deduct it from the final invoice, how to correct an invoice with a credit note, and what the French e-invoicing reform changes from September 2026. Each one has a checklist and a worked example.
E-invoicing in Luxembourg: Peppol today, mandatory between businesses from 2028
Invoices to the Luxembourg public sector have been structured e-invoices sent through Peppol since 2023. Bill 8815 extends the rule to invoices between Luxembourg businesses: receiving from 2028, issuing by 1 July 2028 for large companies and 1 January 2029 for the others. Here is what changes and how to prepare.
Read the guide →
Mandatory invoice details in Luxembourg: the full checklist for SMEs
In Luxembourg the VAT law lists what every invoice must show, and company law adds a few details of its own. Here is the full checklist, the VAT rates, the deadline to issue an invoice, the special wordings, what is changing with e-invoicing and the most common mistakes.
Read the guide →
Credit notes in France: how to correct an invoice with an avoir
An invoice that has been issued can never be changed or deleted, even when it is wrong. In France you correct it with a credit note, an “avoir”. Here is when you need one, what it must show, how it corrects the VAT, and a worked example.
Read the guide →
Deposit invoices in France: acompte, VAT and the final invoice
Asking for a deposit before you start a job protects your cash flow, but in France it comes with rules: an invoice for the deposit, VAT due when you are paid, and a final invoice that deducts it correctly. Here is how it works, with a worked example.
Read the guide →
Mandatory invoice details in France: the full checklist for SMEs
In France every sale between businesses needs an invoice, and each missing detail can cost a fine. Here is every mention an invoice must show, the special wordings, the four new mentions that come with e-invoicing, and the most common mistakes.
Read the guide →
E-invoicing in France from 2026: what changes for small businesses
Since September 2026 every business in France must be able to receive electronic invoices, and all of them will have to issue them by September 2027. Here is the timetable, what an e-invoice is, and what to do now.
Read the guide →
Spanish invoice requirements: the checklist for small businesses
A standard Spanish invoice needs more than a total and a VAT rate. Use this checklist for the seller and customer details, numbering, dates, taxable base, VAT and any special wording.
Read the guide →
Belgian e-invoicing in 2026: a practical Peppol checklist
Since 1 January 2026, structured e-invoices are required for covered domestic B2B transactions between Belgian VAT businesses. A PDF by e-mail alone is not the structured invoice.
Read the guide →
Dutch invoice requirements: a practical checklist for SMEs
Dutch business invoices need sequential numbering, the right company and customer details, supply dates and a clear VAT breakdown. Here is what to include, when to send it and what is changing.
Read the guide →Frequently asked questions
What must every invoice show?
In every EU country an invoice needs the issue date, a unique sequential number, the seller’s and the customer’s names and addresses, the VAT numbers, a description and quantity of what was sold, the date of supply, the amount before VAT, the VAT rate and the VAT amount. Each country adds a few details of its own, such as the 40 € recovery indemnity in France or the RCS number in Luxembourg.
Can I change or delete an invoice I have already sent?
No. Once issued, an invoice keeps its number and stays in your records. To correct a price, a quantity or a cancelled sale, you issue a credit note that refers to the original invoice, and then a new invoice if needed.
Do I have to send e-invoices?
It depends on the country. Belgium has required structured e-invoices between businesses since 1 January 2026, France is phasing them in from September 2026, and Luxembourg already requires them for public buyers. The country guides explain who is concerned and when.
Let's see if Tavalle fits your business
Based in Luxembourg, Tavalle works with businesses worldwide. Tell us about the software your business needs. We reply within one business day — in English, French or Spanish.
- A 30-minute live demo on your own use case
- No commitment and no credit card
- A reply within one business day
- Hosted in the EU (Finland), GDPR-ready
- Your own database, backed up every night
- Two-step login and a full change history
- Built and supported in Luxembourg
- sales@tavalle.com
- Luxembourg
- linkedin.com/company/tavalle
- YouTube
Thank you!
Your request has been sent. We will reply within one business day.