Financial Services Luxembourg · licensed accountant · business permit 10077274 · RCS B213987

FREE 15-DAY TRIAL No credit card · Luxembourg VAT already configured

Invoice in two minutes, compliant with Luxembourg rules.
And the accounting follows on its own.

Most invoicing tools stop at the invoice. Yours then goes to the accounting firm, which re-keys everything and bills you for the hours. At FSL, your invoicing and your accounting live on the same database: what you issue is already booked. Mandatory details, four VAT rates and the Peppol format are included from day one.

Luxembourg mandatory details VAT at 17, 14, 8 and 3% Intra-EU reverse charge Native Peppol invoices Automatic reminders Zero accounting re-keying
Create my first invoice for free See pricing
2minTo issue your
first invoice
0€For fifteen days,
no credit card
4Luxembourg VAT rates
already configured
149€Per month afterwards,
accounting included
01Mandatory details 02Word and Excel 03VAT on invoices 04Invoicing and accounting 05Our 4 plans 06FAQ
Question 01

Which details are mandatory on an invoice in Luxembourg?

A valid Luxembourg invoice includes your full identity with RCS number and VAT number, the customer's identity, a sequential number with no gaps, the issue date, a precise description of the service, the price excluding VAT, the VAT rate and amount per rate, and the total payable. For an intra-EU transaction, add the customer's VAT number and the reverse-charge mention. These requirements change, so check the current version on guichet.lu before rolling out your templates.

Your identity

01

Exact company name as registered, legal form, registered office address, RCS registration number and VAT identification number. Omitting the VAT number deprives your customer of its right to deduct.

  • Company name
  • Legal form
  • Registered office
  • RCS number
  • VAT number
  • Contact details

Numbering

02

A unique number drawn from one or more series, identifying each invoice unambiguously. A cancelled invoice is not deleted: it gives rise to a credit note with its own number. Inconsistent or poorly documented numbering can raise questions during an inspection, for lack of an audit trail on cancellations.

  • Continuous sequence
  • Chronological
  • No duplicates
  • Numbered credit note
  • Issue date
  • Delivery date

Amounts and VAT

03

Precise description of the goods or services, quantity, unit price excluding VAT, taxable base split by rate, corresponding VAT rate and amount, then the total including all taxes. Where an exemption or the reverse charge applies, the corresponding legal mention must appear.

  • Description
  • Base excl. VAT by rate
  • Rate applied
  • VAT amount
  • Total incl. VAT
  • Legal mention
Official source. The mandatory details, exemption cases and reverse-charge rules are published on the Invoice page on guichet.lu and by the Administration de l'enregistrement (AED). As these rules may change, treat this page as a summary and not as a reference text.
Question 02

Can you invoice from Word or Excel in Luxembourg?

Nothing formally prohibits it, but three concrete risks appear quickly. Numbering becomes inconsistent as soon as a file is duplicated or deleted, with no trace of cancellations. VAT is calculated by hand and rate errors go unnoticed until an inspection. Finally, no FAIA export is possible, which forces you to rebuild your books by hand if the tax authority asks for them.

Spreadsheet invoicing

What ends up costing you

  • Inconsistent numbering from the first cancellation
  • VAT rate keyed in by hand, invisible errors
  • No detection of unpaid invoices
  • Forgotten reminders, cash flow slipping
  • Full re-keying at the accounting firm, billed by the hour
  • No FAIA export in case of an inspection
  • Ten-year archiving not guaranteed
Invoicing on Odoo with FSL

What you get back

  • Locked sequence, credit notes handled automatically
  • Four Luxembourg rates pre-configured
  • Real-time tracking of unpaid invoices
  • Configurable automatic reminders
  • Accounting entry generated at issue, zero re-keying
  • FAIA export available on request
  • Time-stamped archiving over ten years
Question 03

Which VAT rate should you apply on your Luxembourg invoices?

Four rates coexist in Luxembourg: 17% standard, 14% intermediate, 8% reduced and 3% super-reduced. For a business customer established in another Member State, the reverse charge applies and the invoice carries the corresponding mention, after checking its VAT number in the VIES database. The categories of goods and services assigned to each rate change over time, so check them with the tax authority before applying them.

Situation
Rate
Treatment on the invoice
Point of attention
Luxembourg customerStandard service or sale
17%
VAT charged normallyBase excl. VAT, rate, VAT amount, total incl. VAT
Check whether a reduced rate applies to your activity
Reduced-rate categoriesDepending on the nature of the good or service
14, 8, 3%
Split by rateOne taxable-base line per rate applied
Lists of eligible goods are exhaustive and subject to revision
Business customer in the EUValid VAT number in VIES
0%
Reverse chargeLegal mention and customer's VAT number mandatory
Check VIES before issuing, keep the proof
Private individual in the EUDistance sale of goods or services
OSS
Customer's country rateAbove the annual threshold of €10,000
Separate quarterly OSS return
Customer outside the EUExport of goods or services
0%
ExemptionExemption mention and proof of exit
Keep the export evidence
Configuration does the work for you

On a database configured by FSL, the rate is applied automatically according to the customer's country and status. You no longer choose a rate, you choose a customer. Special cases are still reviewed manually at the monthly close by a licensed accountant. Details on our page VAT and eCDF return in Odoo.

QUESTION 04

Why does separating invoicing and accounting cost you twice?

A standalone invoicing tool produces a PDF. Your accounting firm then has to re-key it into its own software, and bills you for that time. On fifty invoices a month, this re-keying amounts to several hours a month that you pay for without seeing it, plus a delay of one to two months before you know your real position. When invoicing and accounting share the same database, the entry exists from the moment of issue.

At issueThe accounting entry
is already posted
At paymentAutomatic matching
via the bank
On the 15thVAT return
generated, not rebuilt
At closingNo rework
of entries needed
What you stop paying for

Monthly re-keying

  • Sales entryeliminated
  • Manual reconciliationautomated
  • Chasing missing documentsno longer needed
  • VAT discrepancies to correctavoided upstream
What you gain

Real-time visibility

  • Turnover for the monthcontinuously up to date
  • Customer receivablesand late payments
  • Estimated VAT duebefore the deadline
  • Cash flow forecastbased on known due dates
What stays manual

We don't promise magic

  • Special VAT casesreviewed at closing
  • Year-end adjusting entrieshuman work
  • Provisions and depreciationaccounting judgement
  • Annual accountsthe accounting firm's responsibility
What you keep

No lock-in

  • Ownership of the database100% yours
  • Full exportat any time
  • Licences at vendor price€0 margin
  • Exit within 30 daysfree of charge
Our plans

How much does Odoo cost with an accounting firm included?

Four plans, from the free trial with no credit card to group integration on quote. Configuration is billed once, at a fixed price. The accounting firm's monthly service starts at €149 excl. VAT. No commission on Odoo licences: they are re-invoiced to you at the vendor price, to the euro.

No credit card 01 · Entrepreneur

Try Odoo for 15 days, with a licensed accountant connected to your database.

0 EURFree trial, no commitment, cancel in one click
then €149 excl. VAT / month Monthly accounting service, if you continue

Self-employed, business founder, micro-business still invoicing on Word or Excel.

  • Odoo database opened the same day
  • Luxembourg chart of accounts PCN 2020 preloaded
  • VAT 17 / 14 / 8 / 3% already configured
  • Licensed accountant added in a supervisory role, at no charge during the trial
  • Free 30-minute kick-off video call
  • Your data remains your property
Start for free

Immediate opening. No card required.

02 · Starter

You already have Odoo. We unblock what's stuck.

150 EURexcl. VAT / hour, minimum block of 2 hours, pay as you go
then €249 excl. VAT / month Accounting service, optional

Micro-business or SME already on Odoo and stuck on a specific point: VAT, Peppol, banking, analytics.

  • Targeted sessions, you set the pace
  • VAT configuration and eCDF return
  • Peppol invoicing activation
  • PSD2 bank connection (BIL, BCEE, BGL, ING)
  • Analytic plan and cost centres
  • Written report after each session
Book 2 hours

Slot within 5 business days.

Most requested 03 · Business

Odoo up and running in 10 business days. Fixed price.

3,900 EURexcl. VAT, fixed fee. Any overrun is at our expense
then €590 excl. VAT / month Accounting, VAT and annual accounts included

SME of 5 to 30 employees that wants to stop juggling an accounting package, a CRM and a spreadsheet.

  • Complete configuration for Lux GAAP
  • Migration of 12 months of history
  • Trial balance, general ledger, partner accounts, fixed assets
  • Automatic bank connection
  • Team training, 4 h on site or by video
  • Go-live within 10 business days for a straightforward file
  • VAT returns and annual accounts included
Get my quote within 48 h

3-month commitment. No automatic renewal.

04 · Corporate

Groups, SOPARFIs, multi-entity and production.

from 12,000 EURexcl. VAT, custom quote after a scoping review
then from €1,500 excl. VAT / month Accounting firm, consolidation and reporting

Multi-company group, SOPARFI, family office, manufacturer with production or lot traceability.

  • Multi-company and multi-currency at ECB rates
  • Lux GAAP consolidation, automatic eliminations
  • MRP production, bills of materials, quality
  • REST API and connection to existing tools
  • Quarterly investor reporting
  • Single point of contact, directly reachable
Request a scoping session

Reply within 24 h. Scoping is free.

Your integrator Yours or one of our partners,
configures and maintains the instance
+
FSL Licensed accountant, in the same database,
VAT, eCDF, FAIA and annual accounts
=
One single environment for the software and the accounting,
with no three-way coordination
Odoo licences re-invoiced to the euro. FSL takes no vendor commission. Odoo pricing depends on the chosen plan, the number of users and the hosting mode, with Odoo.sh carrying separate costs. They are billed directly by Odoo or re-invoiced at the applicable vendor rate, to the euro. You remain the owner of your instance and can leave at any time: we hand over full access within 30 days, with no exit fees.
Question 06

FAQ invoicing software in Luxembourg

Eight questions marked up in FAQPage Schema.org. The tax rules cited refer to official sources and may change.

Which details are mandatory on an invoice in Luxembourg?+
The mandatory details on an invoice in Luxembourg are your full identity with RCS number and VAT number, the customer's identity, a sequential number, the issue date, the description of the service, the price excluding VAT, the VAT rate and amount per rate, and the total payable. For an intra-EU transaction, add the customer's VAT number and the reverse-charge mention. Check the current version on the Invoice page on guichet.lu.
Can you invoice from Word or Excel?+
Invoicing from Word or Excel is not formally prohibited, but it exposes you to three risks: numbering becomes inconsistent as soon as a file is duplicated or deleted, with no trace of cancellations; manual VAT calculation lets rate errors slip through; and no FAIA export is possible in case of an inspection, which forces you to rebuild everything manually.
What is the best invoicing software in Luxembourg?+
The best invoicing software in Luxembourg depends on your scope: a simple tool is enough for anyone who only needs to issue invoices, while an ERP such as Odoo pays off as soon as invoicing has to be linked to accounting without monthly re-keying. The tipping point comes when you need to link invoices to the accounting : a standalone tool then requires monthly re-keying at the accounting firm, billed by the hour. Odoo covers invoicing and accounting on the same database. FSL opens a free trial database for fifteen days, with no credit card.
How much does invoicing software cost in Luxembourg?+
Invoicing software in Luxembourg costs between €10 and €40 excl. VAT per month for simple tools. Odoo covers invoicing and accounting on the same database, at a licence price that varies with the plan and the number of users. Odoo covers invoicing and accounting on the same database, at a licence cost that varies with the plan and the number of users. At FSL, the trial is free for fifteen days, then the accounting service starts at €149 excl. VAT per month, with bookkeeping, VAT returns and annual accounts included.
How do I handle Luxembourg VAT on my invoices?+
To handle Luxembourg VAT on your invoices, apply one of the four rates in force, 17% standard, 14% intermediate, 8% reduced and 3% super-reduced, and the reverse charge for a business customer in another Member State after checking its number in VIES. For a business customer in another Member State, the reverse charge applies with the corresponding mention, after checking the VAT number in VIES. For distance sales to private individuals in the Union, the OSS scheme may apply above €10,000 per year.
Is e-invoicing mandatory in Luxembourg?+
E-invoicing is mandatory in Luxembourg for public-sector suppliers since the law of 13 December 2021, with a phased rollout completed on 18 March 2023. For private B2B, the obligation is not yet widespread. For private B2B, the obligation is not yet widespread but fits within the European ViDA trajectory. Details on our page Peppol invoicing in Luxembourg.
How long must I keep my invoices?+
You must keep your invoices for ten years in Luxembourg, together with the supporting accounting documents. Electronic archiving is accepted if the integrity of the content and its legibility are guaranteed throughout the period. Electronic archiving is accepted if the integrity of the content and its legibility are guaranteed over the whole period. A folder of PDFs on a workstation, with no backup or time-stamping, does not robustly meet this condition.
Can I change invoicing software during the year?+
You can change invoicing software during the year provided you preserve the continuity of numbering: take the last number issued in the old tool and continue the sequence in the new one, documenting the switch. The safest method is to take the last number issued in the old tool and continue the sequence in the new one, documenting the switch. FSL imports the invoice history of the current financial year so that the sequence remains verifiable end to end.
What is the deadline for issuing an invoice in Luxembourg?+
The deadline for issuing an invoice in Luxembourg between businesses runs until the 15th day of the month following the month of delivery of the goods or supply of the services, or until the deposit is received if that comes earlier. Nothing prevents issuing earlier. For a transaction with a consumer, the invoice must be issued within the month of receipt of the goods or completion of the work in order to claim late-payment interest. Details on guichet.lu.
Are the requirements lighter for an invoice under 100 euros?+
The requirements are lighter for an invoice not exceeding 100 euros incl. VAT : issue date, supplier name and address, quantity and nature of the goods or services, price including tax, and VAT amount or the data needed to calculate it. Above this threshold, the full list of mandatory details applies.
Must the business permit number appear on the invoice?+
The business permit number is among the mandatory details of a Luxembourg invoice of more than 100 euros incl. VAT, along with the company name, legal form, registered office and registration number in the Trade and Companies Register (RCS). Sole-trader craftspeople and traders also state their profession. This detail is often missing from invoice templates imported from abroad.
What is an accepted invoice between traders?+
An invoice accepted between traders is an invoice that the recipient has not disputed within a reasonable time, and which then serves as proof of the contract. Acceptance may be express or tacit, notably in the case of payment without reservation or prolonged silence. Luxembourg courts generally apply a presumption of acceptance after four to eight weeks. This concept does not apply to a final consumer: a groundless invoice must therefore be disputed quickly and in writing.

Are you looking instead for complete accounting software?

If your need goes beyond the invoice and covers bookkeeping, VAT, annual accounts and filing with the RCS (Luxembourg Business Registers), our dedicated page compares the accounting software on the Luxembourg market, details the three legal obligations to cover and gives the actual prices charged.

See the accounting page
Odoo hub

Go further with Odoo in Luxembourg

The Odoo pages of Financial Services Luxembourg, licensed accountant: integration, configuration, VAT, migration and e-invoicing.

Issue your first invoice within two minutes.

Database opened the same day, Luxembourg VAT rates already configured, mandatory details pre-filled. Fifteen days free, no credit card. If you don't continue, nothing is billed.

Create my first invoice +352 661 198 544
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No credit cardNo automatic debit
✓
Compliant from the first invoiceDetails and VAT pre-configured
✓
Accounting included afterwardsFrom €149 excl. VAT per month
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Your data belongs to youFull export within 30 days
CallRequest a quoteFirm quote within 48 h