How do I calculate French VAT? The question of roundings and ancillary costs in the event of specific rates.

I. What is meant by "ex-tax" (HT) in the context of VAT?

The ex-tax (HT) amount corresponds, in principle, to the VAT taxable base, also known as the "taxable amount." This is the figure upon which VAT is calculated, generally consisting of the price of the goods sold or services provided.

Let's look at a simple example: Company A sells goods to Company B for a price of €100 ex-tax. The VAT taxable base is €100. If the transaction is subject to the standard VAT rate of 20%, A must charge B €20 in VAT, for a total price of €120 including tax (TTC).

What does the VAT taxable base include?

For the supply of goods and services, the taxable base generally includes all sums, values, goods, or services received or to be received by the seller or service provider in return for the transaction, whether this payment is made by the client or by a third party.

In addition to the price of the good or service, certain elements must therefore be included in the taxable base, in particular:

• Duties, levies, and taxes, with the exception of VAT itself;
• Incidental expenses charged to the client, such as commission, packaging, transport, or insurance costs;
• Subsidies directly linked to the price of the transaction, when they constitute part of the consideration for the good delivered or service provided.

Which amounts are excluded from the VAT taxable base?

Conversely, certain amounts are not included in the taxable base, in particular:

• Discounts granted for early paymentwhen they constitute an effective price reduction;
• Rebates, discounts, and refunds granted to the client and acquired at the time of the transaction;
• Disbursements, i.e., sums reimbursed to the seller or service provider for expenses incurred in the name and on behalf of their client, provided that the applicable conditions are met, in particular their recording in suspense accounts and the justification of their exact amount.

In summary, the VAT taxable base is not necessarily limited to the price initially agreed upon between the parties. In principle, it includes all elements constituting the consideration for the transaction, to which certain fees and taxes are added, after deduction of price reductions and sums legally excluded from this base.

II. How do I determine the taxable base when I have a payment in a foreign currency?

When a transaction subject to VAT is invoiced in a foreign currency, the taxable base must be converted into euros in order to determine the amount of VAT due.

In France, the exchange rate to be used is, in principle, the latest rate published by the European Central Bank (ECB) on the day the VAT becomes due.

When the conversion involves two currencies other than the euro, it is carried out using the reference rates of these currencies against the euro.

Note: specific conversion rules may apply to certain transactions, particularly imports and intra-community acquisitions of goods, for which the use of monthly exchange rates may be permitted.

On what date does VAT become due?

The date on which VAT becomes due is essential, as it determines the exchange rate to be used. It varies according to the nature of the transaction.

For services:

• In principle, VAT becomes due upon receipt of the price or a down payment, up to the amount received.
• If you opt for VAT on accruals, the tax becomes due when the amount is debited from the customer's account, which generally corresponds to the invoice date. However, if a down payment is received before this date, the VAT becomes due upon receipt of that payment.
• For certain international services subject to the reverse charge mechanism by the recipient, VAT is generally due at the time the service is performed, without waiting for payment. However, if a down payment is made before the service is completed, VAT becomes due on the amount paid.

For the supply of goods:

• In principle, VAT becomes due at the time of delivery, i.e., when the power to dispose of the goods as an owner is transferred to the buyer.
• In the event of a down payment, VAT becomes due upon receipt, up to the amount collected, provided that the goods in question are clearly identified. This rule has been in effect since January 1, 2023.

In practice, when a transaction is paid in installments and these payments trigger successive tax due dates, different exchange rates may need to be applied to each amount received.

III. How to calculate VAT from an exclusive-of-tax (excl. tax) amount?

To calculate VAT from an amount excluding tax (excl. tax), simply multiply the price excl. tax by the VAT rate applicable to the transaction.

The formula is as follows:

VAT amount = Price excl. tax × (VAT rate / 100)

Let's look at an example: a company sells a product for €100 excl. tax, subject to the standard VAT rate of 20%.

• Amount excl. tax: €100
• VAT rate: 20%
• VAT amount: 100 × 20% = €20
• Price including tax: 100 + 20 = €120

The price including tax (TTC) is therefore the price excluding tax (HT) plus the VAT.

Price including tax = Price excluding tax + VAT amount

Calculate your VAT automatically

To make your calculations easier, we provide an automatic VAT calculator, available directly on this page. It allows you to quickly determine the VAT amount and the price including tax based on an amount excluding tax and the applicable VAT rate.

You can also check out our VAT calculation formula cheat sheet, which lists the formulas to use for each VAT rate.

IV. How do you calculate VAT from a price including tax (reverse VAT calculation)?

To find the amount excluding tax (HT) from a price including tax (TTC), you must remove the VAT included in the price. To do this, simply divide the price including tax by 1 plus the applicable VAT rate.

The formula is as follows:

Price excluding tax = Price including tax / (1 + VAT rate / 100)

Let's look at an example: an item is sold for €527.50 including tax, with a VAT rate of 5.5%.

• Price including tax: €527.50
• VAT rate: 5.5%
• Price excluding tax: 527.50 / 1.055 = €500
• VAT amount: 527.50 − 500 = €27.50

This calculation is particularly useful for VAT on margins or for configuring accounting and invoicing software.

Conversion coefficients published by the tax authorities

Another method is to directly multiply the price including tax by a conversion factor, corresponding to the inverse of 1 plus the VAT rate.

The tax authorities publish conversion factors rounded to three decimal places in the BOFiP:

These factors are included in the administrative guidelines BOI-TVA-LIQ-10, § 50 and 60.

Watch out for rounding differences

Using rounded factors can lead to discrepancies compared to the exact mathematical calculation.

Example: for a transaction invoiced at €120 including tax, subject to the standard 20% rate, the exact calculation yields:

• Price excluding tax: 120 / 1.20 = €100
• VAT: 120 − 100 = €20

By applying the administrative factor of 0.833, the price excluding tax obtained is €99.96 (120 × 0.833).

Two interpretations of the calculation are therefore possible.

First method: calculate the VAT as the difference between the total including tax and the reconstructed price excluding tax.

The VAT corresponds to the difference between the price including tax and the amount excluding tax obtained after applying the factor:

120 − 99.96 = €20.04 in VAT

This method results in a VAT amount that is €0.04 higher than the amount resulting from the exact mathematical calculation.

Second method: recalculate the VAT based on the reconstructed pre-tax amount.

Another interpretation is to consider that the administrative coefficient is used solely to determine the taxable base. The VAT is then calculated by applying the legal rate to this pre-tax base:

99.96 × 20% = €19.99 in VAT, after rounding to the nearest cent.

This second method is more favorable to the taxpayer, as it leads to a VAT amount slightly lower than that obtained by the exact calculation, and even more so than that determined by the difference from the tax-inclusive price.

However, it may be challenged by the tax authorities, particularly because the VAT amount calculated in this way no longer corresponds exactly to the amount included in the tax-inclusive price.

The issue therefore lies in the interpretation of administrative coefficients: should they be used to reconstruct a pre-tax price from which the VAT is recalculated at the legal rate, or to determine directly, by difference, the amount of VAT included in the tax-inclusive price?

In practice, the chosen method and rounding rules can have a financial impact, particularly when calculations involve a large volume of transactions.

A tip for quickly calculating VAT at the 20% rate

When a transaction is subject to the standard VAT rate of 20%, there is a particularly simple method for finding the VAT included in a tax-inclusive price:

VAT amount = Tax-inclusive price / 6

For example, for a price of €120 including tax:

120 / 6 = €20 in VAT

This method allows you to find the exact VAT amount directly, without using a rounded coefficient.

Calculate your VAT automatically

To make your calculations easier, we provide an automatic VAT calculator, available directly on this page.

You can also find all the formulas applicable to the different rates in the VAT calculation formula cheat sheet.

V. What should be done when incidental costs are invoiced with several services subject to specific rates?

As previously stated, incidental costs invoiced to the client must, in principle, be included in the VAT taxable base. This is particularly the case for transport and delivery costs for goods.

Thus, when a company handles the transport of goods for which it remains responsible until delivery to the buyer, the corresponding costs constitute an element of the selling price, even when they are invoiced separately.

The VAT rate applicable to these costs then depends on the nature of the goods sold and the potential existence of several distinct transactions.

1. When the sale involves a single good or a single transaction

Incidental transport costs follow the same VAT regime as the main transaction.

For example, when a merchant sells a food product subject to the reduced rate of 5.5%, the delivery costs incidental to this sale are also subject to the 5.5% rate.

This rule also applies to single complex transactions, composed of several elements forming a single economic operation. In this case, the transport costs follow the tax treatment of the single transaction.

2. When the order includes several goods subject to different rates

The situation is different when a single order includes several goods constituting distinct transactions, subject to different VAT rates.

In this case, the incidental transport costs must be allocated between the different transactions in order to apply the corresponding VAT rate to each portion.

In the absence of specific allocation methods, a breakdown proportional to the price of the goods is a viable option, provided it accurately reflects the incidental costs associated with each transaction.

Let's look at an example: An e-commerce site sells the following in a single order:

• A food product at €100 excl. tax, subject to the reduced VAT rate of 5.5%;
• An electronic product at €200 excl. tax, subject to the standard VAT rate of 20%;
• Shared delivery costs of €15 excl. tax.

The total value of the goods is €300 excl. tax. The delivery costs can be allocated proportionally to their price:

Thus, the €15 in delivery costs is not entirely subject to the standard 20% rate: each portion follows the rate applicable to the good to which it relates.

Please note: This proportional breakdown is not necessarily suitable for all situations. If the merchant sets specific delivery fees for each item, for example by displaying an individual shipping rate on each product page, these amounts can be directly assigned to the relevant goods, provided they truly correspond to the commercial terms of the transaction.

3. Can a separate VAT rate be applied to shipping costs?

Yes, provided that the shipping constitutes a genuine service distinct from the sale of the goods.

The price of shipping can then be separated from that of the goods and subjected to its own specific VAT regime.

To do this, it is not enough to simply list shipping costs on a separate line on the invoice. Specifically, the following must be true:

• The shipping must be a service that is genuinely distinct from the sale;
• The seller and the buyer must have expressly agreed to pay for this service separately;
• The price charged must correspond to the actual and standard remuneration for the shipping.

When these conditions are met, shipping costs can be subject to the VAT rate specific to that service, which is generally the standard 20% rate for goods transport services taxable in France.

However, Simply invoicing delivery charges separately is not enough to classify them as an independent service..

Please note: specific rules may also apply when transport is carried out in the name of and on behalf of the buyer, particularly for sales concluded under "ex works" terms.

For more information, consult the administrative guidelines regarding transport costs and their inclusion in the VAT taxable base (BOI-TVA-BASE-10-20-10).

VI. How to round amounts?

Calculating VAT can be difficult when the resulting amounts have multiple decimal places. These difficulties are particularly significant for businesses handling a large volume of transactions, as rounding differences of a few cents can add up to significant amounts when accumulated..

1. What does European regulation provide?

The Court of Justice of the European Union (CJEU) has clarified that in the absence of harmonized European rules, each Member State is free to determine the rounding methods applicable to VAT..

This freedom is not absolute, however: national rules must respect the fundamental principles of the common VAT system, in particular the principles of fiscal neutrality and proportionality.

The CJEU also held that EU law does not require Member States to allow businesses to systematically round down the VAT calculated on each item.

Reference: ECJ, July 10, 2008, Koninklijke Ahold, C-484/06.

2. How does the French tax authority audit VAT rounding?

In France, the tax authority may verify that the calculation and rounding methods used by a company correctly determine the VAT due on transactions performed.

When a company makes sales to consumers at prices including tax (TTC), the authority may, in particular, reconstruct the VAT included in the amounts collected.

This process generally consists of:

• Identifying the total turnover including tax (TTC) generated during the audited period;
• Breaking down this turnover by VAT rate, in order to distinguish between transactions subject to different rates;
• Reconstructing the taxable base and the corresponding VAT amount for each category of transaction.

Let's take an example: a supermarket has a turnover of €1,500 including tax (TTC), broken down as follows:

• €1,000 including tax (TTC) in sales subject to the standard rate of 20%;
• €500 including tax (TTC) in sales subject to the reduced rate of 10%.

To determine the VAT included in these amounts, the calculation can be performed as follows:

• For sales at 20%: 1,000 / 1.20 × 20% = €166.67 in VAT;
• For sales at 10%: 500 / 1.10 × 10% = €45.45 in VAT.

The total amount of VAT included in the turnover therefore amounts to €212.12, before any application of rounding rules specific to the tax return.

3. Can the conversion coefficients published by the tax authorities be used?

As mentioned previously, the tax authorities publish conversion coefficients in their official guidelines that allow for the determination of a pre-tax price from a tax-inclusive price.

These coefficients are rounded to three decimal places and can be found in BOI-TVA-LIQ-10, in paragraphs 50 and 60.

Taxpayers may therefore consider an alternative calculation method consisting of using these coefficients to reconstruct the taxable base.

Using our example:

This method results in a VAT amount of €212.50, compared to €212.12 with the exact mathematical calculation.

The use of administrative coefficients can therefore, in certain situations, lead to an increase in the VAT paid by the seller, which is not necessarily in their best interest.

However, another interpretation is to consider that these coefficients are only used to reconstruct the pre-tax base, upon which the VAT must then be calculated by applying the legal rate.

In our example, this approach would yield:

• At the 20% rate: 1,000 × 0.833 × 20% = €166.60;
• At the 10% rate: 500 × 0.909 × 10% = €45.45.

For a total amount of €212.05 in VAT.

This second interpretation is more favorable to the taxpayer. However, it may trigger challenges from the tax authorities if the VAT calculated in this way is lower than that resulting from the exact mathematical breakdown of the tax-inclusive price.

The scope of administrative coefficients and the conditions under which a taxpayer may rely on them must therefore be assessed with care.

4. Beware of systematically rounding down

A business should not assume it can systematically round VAT to its own advantage.

While rounding differences are generally small for a single transaction, they can accumulate to a significant amount for a company making thousands or even millions of sales.

A method of systematically rounding VAT down can lead to an underestimation of the tax actually due.

The risk is particularly high when the company cannot justify the calculation rules applied or when the observed discrepancies reveal a recurring underpayment of declared VAT.

Administrative case law illustrates the difficulties that can arise from such practices, particularly when the rounding methods used result in a significant gap between the calculated VAT and the VAT that should result from the taxable transactions.

In practice, it is therefore essential to verify the settings of point-of-sale, invoicing, and accounting software, especially when transactions are numerous or subject to multiple VAT rates.

5. What rounding rules apply to the VAT return?

Finally, it is necessary to distinguish between rounding performed when calculating VAT on individual transactions and that applicable when preparing the VAT return.

French VAT returns are generally prepared in whole euros, without cents.

Taxable bases and declared tax amounts are rounded to the nearest euro:

• If the fraction is less than €0.50, it is disregarded;
• If the fraction is €0.50 or greater, it is rounded up to the next euro.

These principles are provided for in particular by articles L. 131-1 and L. 131-2 of the Code of Taxes on Goods and Services, as well as by the provisions to which they refer.

Please note: this does not mean that every sale must be rounded to the euro before being recorded in the accounts or included in the return.

The rounding rules applicable to the return must be distinguished from the methods used to calculate VAT on invoices and receipts.

6. Why are these rules important in the event of a tax audit?

During an audit, the tax authorities may compare the turnover recorded by the company, its breakdown by VAT rate, and the tax amounts declared.

They can thus look for any inconsistencies between the sums collected and the VAT paid to the Public Treasury.

The goal is therefore to have a consistent, justifiable calculation method that is correctly applied over time, in order to prevent an accumulation of rounding differences from leading to a VAT reassessment.

This vigilance is particularly relevant for retailers, online sales platforms, supermarkets, and, more generally, any business handling a high volume of transactions.

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