You often engage costs for your work, that sometimes can be charged to your client (e.g. travel or material expenses). Application of VAT may often be confusing when writing your sales invoice. Here, we explain the basic principles regarding VAT and give you an overview of how to apply billable expenses to your sales invoices.
(Frais avancés / Voorgeschoten kosten)
In principle, these are expenses you pay on behalf of someone else, so the invoice (linked to the expense) is not in your name. You make an expense in your customer's name and on his behalf, you advance him the money, nothing more!
→ Example: Your customer invites you to a restaurant and when it's time to pay the bill, he realizes he's forgotten his wallet. So you pay for him, and he insists that you re-invoice the amount.
(Refacturation de frais / Kosten doorfactureren)
In practice, this is what happens the most often |
It's as simple as that: everything that is not an advanced cost. If you don't meet all the conditions to qualify as advanced expenses under art.28, 5° CTVA, then you're talking about billable expenses.
In the case of a billable expense, the invoice for the expense is in your name and you have paid it. For various reasons, you are going to re-invoice these costs in full or in part to your customer.
→ Example: You're a plumber who needs to replace a customer's toilet flush. You buy the flush from your supplier and receive a purchase invoice in your name (with your contact details, VAT number, etc.).
🚨 The crucial distinction is made at the point of the expense: who pays and whose name is on the purchase invoice? |
When you invoice your customer, you are simply asking for reimbursement of the amount advanced. You absolutely must issue an invoice in the customer's name, and do so without VAT as required by law (art.28, 5° CTVA). The amount advanced and then invoiced to obtain the refund is not part of the taxable income.
🚨 Warning: Do not charge any surcharges or mark-ups! Advances are not included in your tax base if the invoice shows the exact amount without applying VAT. → If you ask for a majoration or supplement, then you are asking for more than you have advanced, and this is then considered a service performed for which you are compensated. In this case, VAT must in principle be applied to the total amount (Art.26, §1 CTVA). |
💡 A principal operation occurs when you have supplied a good or service that is directly linked to your self-employed activity and, on this occasion, you re-invoice the customer for certain costs directly linked to the good or service supplied.
If the costs are re-invoiced as part of a main operation, then the rate to be applied is the same as the main operation. In accounting terms, and for VAT purposes in particular, the accessory (in this case, the toilet flush) follows the principal (in this case, the installation of the flush).
🚨 Warning: Your invoice must clearly separate the service provided and the re-invoiced expenses, and in this case, your invoice will have two separate lines. If you re-invoice the costs in a separate invoice: same principle, the VAT rate should follow the rate of the main operation. |
If the expenses are not related to the main operation, the re-invoiced expenses follow their own VAT rate, i.e. in your sales invoice, the VAT rate on the re-invoiced expenses will follow the VAT rate on the purchase invoice.
On the other hand, if the expenses are outside the scope of VAT (= exempt from VAT, e.g. insurance company, school or university education), then there is no VAT to be applied when re-invoicing.
⚠️ Warning – Advanced costs:
These invoices should not be sent to your client via Peppol, but only by email or PDF.
In the Revenue tab:
You can create the invoice in Accountable and then send it to your customer via email or PDF (not Peppol). Once your customer has received the invoice, you will need to delete it, as it cannot be considered as revenue.
Make sure to keep a copy of the invoice in case of an audit.
In the Bank tab: Classify the two transactions as a "Personal payment".
🚨 Warning: Never add the purchase invoice to the Expenses tab, as the purchase invoice is not in your name and therefore cannot be considered a deductible expense. |
→ Example: As part of an assignment for your customer, you incur expenses for a train journey. You will therefore purchase a train ticket, which you will re-invoice to your customer.
In the Expenses tab: You need to add the purchase invoice to the corresponding category (in the example of the train ticket, the VAT will be 6%).
In the Revenue tab :
🚨 Reminder: Your invoice must clearly separate the service provided and the billable expenses, and in this case your invoice will have two separate lines. If you re-invoice the charges in a separate invoice: same principle, the VAT rate should follow the rate of the main operation. |
→ Example of an invoice with the billable expense :
⇉ The re-invoiced train ticket is on a separate line and follows the same VAT rate (here 21%) as well as the main operation category:

→ Note: The amount I spent on the €50 including VAT train ticket, will be the amount excluding VAT when re-invoicing the cost.
In the bank screen: You can link transactions to expenses and revenue, respectively.
If you have any questions, please feel free to contact us via chat or by email to the following address: support@accountable.eu
Author - Valesca Wilms
As content marketing lead at Accountable Belgium, Valesca writes about freelancing, self-employment, and taxes based on her own experience as a freelancer.
Who is Valesca ?Thank you for your feedback!
Useful
As a self-employed individual with a sole proprietorship, your income is taxed under the personal in...
Read moreStarting from 2026, all self-employed individuals will need to send their invoices electronically in...
Read moreThe VAT reverse charge is a complicated word for a simple concept. It helps you purchase and sell sm...
Read moreLe suivi par mail de votre service est appréciable. J’ai été étonné de devoir communiquer mon no de compte bancaire et surtout de donner un accès consultatif à celui-ci. Mais je vous l’avais déjà évoqué en vous précisant la raison. Bien cordialement François Bellière
Anonyme
la qualité des conseils donnés
Maël Fraipont
Très bien, disponibilité !
Daniel Mpoy Mukeba
C’est hyper clair et le service est impeccable, vous répondez vite. La seule chose que j’ai remarqué qui pourrait être une nouvelle fonctionnalité: avoir la possibilité d’être plus précis au niveau de la détermination de ce qu’on paye pour nos cotisations sociales quand on a choisi un plan d’apurement. Par exemple, 300€ par mois au lieu que le choix soit juste par trimestre.
Patryk Borkowski
The coaching session on tax management was excellent, good material, excellent explanations and very insightful…my accountant and tax advisor are good, but never so comprehensive and accurate. Combined with the AI I never feel alone with Accountable
Sergio Barbarino
La rapidité de la réponse et l'efficacité
Véronique Rochet
Super snel en correct geholpen!
Jean-Charles Tibbaut
Le contact avec l'equipe ! On n'a pas affaire à un chat avec un robot stupide qui ne comprend rien mais avec des humains et un vrai dialogue
Freddy Carrette
altijd snelle, vriendelijke en professionele service. Ook al heb ik door gebrek aan activiteit weinig gebruik kunnen maken van uw diensten. Gisteren heb ik het contract opgezegd, en ook dat is heel vlot verlopen. Waarvoor dank.
Luc Kupers
The availability of your team to help and guide people to understand their finances better is what really makes Accountable valuable. While the AI is able to give answer to most of the basic questions, specific scenarios need counsel from a human which your team performs beautifully.
Sofiya Bogdan Neves