Invoicing in Tunisia: VAT, fiscal stamp and withholding tax explained

A poorly drawn-up invoice means a tax risk, a delayed payment and sometimes a dispute with the customer. In Tunisia, several rules stack up: VAT, fiscal stamp, withholding tax and mandatory legal information. Here is how to put together a flawless invoice, without spending hours on it.

What a compliant invoice must contain

Beyond the tax calculation, a Tunisian invoice must include a core set of mandatory information. Its absence can lead to the document being rejected by the tax authorities or by your customer:

• The full identity of the seller and the buyer (company name, address).
• The tax registration number of both parties.
• A sequential invoice number and the date of issue.
• The breakdown of the goods delivered or services rendered: description, quantity, unit price.
• The pre-tax amount, the VAT broken down by rate, the fiscal stamp, the withholding tax where applicable, and the total including all taxes.

VAT: break it down by rate

Value added tax (VAT) applies to the pre-tax amount. Tunisia uses several rates depending on the nature of the good or service. The principle: each invoice line carries its own rate, and the invoice totals the VAT by rate before adding everything up.

The most common mistake is applying a single rate to the whole invoice when the items fall under different rates. Good invoicing software associates the rate with each item and automatically calculates the breakdown — you no longer make mistakes, and the invoice stays readable for the accountant.

Element	Calculation basis	Effect on the invoice
Pre-tax amount	Quantity × unit price	Basis for VAT
VAT	Pre-tax × applicable rate	Added to the pre-tax amount
Fiscal stamp	Fixed duty per invoice	Added to the total
Withholding tax	% on the amount owed	Deducted from the net amount payable

The fiscal stamp

The fiscal stamp is a fixed duty due on every invoice. Unlike VAT, it does not depend on the amount: it is a flat sum, set by the finance law, that is added to the invoice total. It must appear separately on the document.

In practice, many businesses forget the stamp or integrate it poorly into the total. Configured software adds it systematically and shows it on a dedicated line, which secures both the calculation and the presentation.

Withholding tax

Withholding tax works differently from other taxes: it is not the supplier who collects it, but the customer who deducts it from the amount they owe, then pays it to the State. It frequently applies to sales to public administrations or large companies.

In practice, how does it work?

• The supplier draws up their invoice normally (pre-tax + VAT + stamp).
• The customer applies the required withholding rate to the amount concerned.
• The net amount payable to the supplier is reduced accordingly.
• The customer issues a withholding certificate to the supplier, who can offset it against their own tax.

For the supplier, the key is to properly show the withholding on the invoice and to obtain the certificate, otherwise they "lose" the amount deducted. Here again, automation prevents omissions and cash flow discrepancies.

From quote to payment, without a break

The invoice is only one step in a wider chain. In a well-organized SME, the quote turns into a purchase order, then a delivery note, then an invoice, and finally a payment. When these steps live in separate tools, every transition is a re-entry and a source of error.

With an integrated sales & invoicing module, the accepted quote becomes an invoice in one click, stock is decremented automatically and treasury is updated. You track the outstanding balance of each customer in real time and follow up on unpaid invoices according to their age.

The invoicing mistakes that cost dearly

1. Forgetting the fiscal stamp or withholding tax: adjustments and cash flow strain.
2. Discontinuous numbering: a red flag during an audit.
3. Incorrect VAT rate on certain lines: possible reassessment.
4. Missing tax registration number: an unenforceable invoice, a customer who refuses to pay.
5. No tracking of the outstanding balance: unpaid invoices that pile up for lack of follow-up.

All these mistakes have one thing in common: they disappear when invoicing is governed by compliant software that applies the rules for you.

Swifto and Tunisian tax compliance

Swifto natively handles VAT, the fiscal stamp, withholding tax and legal invoice numbering, with compliant document templates ready to send. Invoicing is connected to stock, treasury and accounting: a single entry feeds the entire chain.

To go further, discover what an ERP is and why your SME needs one, or explore the ERP solution for SMEs.

This article is for informational purposes and does not replace personalized tax advice. The rates and amounts in force are set by the finance law; check them with your chartered accountant.