Self-supply VAT when you build a property for your own use

Quick answer. A self-supply (LASM in French) is when a taxable person allocates to its own business a good it has produced or built (article 257, II of the CGI). For a constructed property, it becomes taxable when the asset serves an activity without full input-VAT recovery: VAT is then charged on the cost of production.

You have decided to build a property for your own activity: premises, offices, a warehouse, sometimes housing. During the works, suppliers charge you VAT that you recover as the project progresses. Everything looks neutral. Then comes completion, and with it a question many directors discover late: on this asset you neither bought nor resold, must you report VAT "to yourself"?

This is exactly what the self-supply mechanism is about. Technical but structural, it aims to restore VAT neutrality when a business produces an asset for its own use rather than buying it on the market. We explain here when it actually applies to properties, how the taxable base is computed and how reporting works, without falling for assumptions inherited from the pre-2010 regime.

A self-supply is the operation by which a taxable person obtains, from goods or items it owns, an asset that it then allocates to the needs of its business. Article 257, II of the CGI treats this as a supply of goods made for consideration. In practice, the business sells the asset to itself for VAT purposes, and charges "VAT to itself".

The underlying idea is simple: VAT must not favour the one who produces in-house over the one who buys externally. If a business could build an asset while recovering all input VAT, then allocate it to an exempt activity without ever charging output VAT, it would enjoy an advantage its purchasing competitor would not. The self-supply rule corrects this distortion.

It applies first to goods the business has produced, built, extracted, made or transformed, and, in some cases, to goods bought or imported. For a property, the "produced asset" is the structure built from land, materials and works.

Self-supply, reverse charge, self-consumption: do not confuse them#

The wording is misleading. A self-supply is not the standard VAT reverse charge (where the liable customer accounts for the tax instead of the supplier). Nor is it a mere accounting entry without tax effect. It is a standalone taxable operation, with its own base, chargeable event and line on the return. The general reverse-charge mechanism is a separate topic.

This is the decisive point, and the one that changed most. The self-supply of a constructed property is taxable when the asset is used for operations that do not give a right to full recovery of input VAT (article 257, II of the CGI). The trigger is not the construction itself, but the allocation of the asset to an activity that does not allow full recovery.

Three typical situations fall within this case:

• the business is a partial taxable person, only part of whose activity gives a right to deduction;
• the property is allocated to a VAT-exempt sector (for instance certain bare lettings, exempt medical or financial activities);
• the property relates to certain social-housing operations under a specific regime.

Conversely, if the constructed property is entirely allocated to a taxable activity with full recovery, the self-supply creates no net charge: the output VAT is offset by an equal deduction. Many fully taxable businesses therefore have no final cost in practice, which is why the topic often goes unnoticed until an audit.

The underestimated risk#

The most common trap is not the reporting itself, but the change of allocation. A business builds premises intended for a taxable activity, recovers all input VAT, then finally allocates the asset to an exempt activity. This switch can trigger an adjustment, of which the self-supply is one vector. Documenting the intended use from the start of the works, then tracing any change, is a reflex we recommend.

The logic unfolds in two stages: the construction phase, then completion.

During construction, the VAT charged by architects, works companies and material suppliers is in principle deductible under ordinary conditions. The business therefore recovers input VAT as it goes.

At completion, the self-supply applies: the business charges "VAT to itself" on the constructed asset. The deduction of this output VAT then follows the actual deduction ratio of the business for that asset:

• a ratio of 1 (taxable activity): the output VAT is fully deductible, the operation is neutral;
• a partial ratio: only a fraction is deductible, the rest is a cost;
• a nil ratio (exempt activity): no deduction, the output VAT becomes a definitive cost.

This mechanism "freezes" VAT at the actual level of use of the asset: the business cannot recover more than its activity justifies.

The taxable base of a self-supply of a constructed property is its cost of production. This cost aggregates every element that contributed to the construction:

• the land (its value or acquisition cost, as the case may be);
• the materials and supplies incorporated into the structure;
• the works invoiced by the contractors involved;
• the costs directly linked to the construction (project-management fees, studies, connections).

It is therefore not a market price or an estimated value, but a sum of real, documented costs. The quality of the project's cost accounting becomes decisive here: a poorly documented base is an adjustment target during an audit.

What the tax authorities look at#

On this type of file, attention typically focuses on three points: the completeness of the cost of production (nothing should be missing from the base), the consistency between input VAT deducted during the works and the final allocation of the asset, and the date of the chargeable event, which determines the relevant return. Keeping the works contracts, situations, material invoices and the breakdown of internal costs is the best protection.

Reporting follows a precise logic. Here are the steps we apply on a construction file.

1. Qualify the allocation of the asset. Determine whether the property serves a taxable, exempt or mixed activity. This qualification tells you whether the self-supply will have a cost or stay neutral.
2. Identify the chargeable event. For a constructed property, it is in principle at completion. It attaches the self-supply to a reporting period.
3. Rebuild the cost of production. Add up land, materials, works and construction costs to build the taxable base, with supporting documents.
4. Compute the output VAT. Apply the rate applicable to the asset to that base. The rate depends on the nature of the property and the operation, and must be checked case by case.
5. Determine the deduction. Apply the actual deduction ratio to know which share of the output VAT is recoverable.
6. Report on the VAT return. Show the output VAT for the self-supply and the corresponding deduction on the return for the period of the chargeable event.
7. Document the file. Keep a complete file (detailed cost of production, allocation evidence, ratio computation) to secure the operation over time.

The procedure looks mechanical, but each step calls for a technical judgment. The rate, the ratio and the completion date are parameters to validate, never to assume.

Much of the confusion comes from an old reflex. Before the 2010 reform of property VAT, the self-supply of new properties not resold within a certain period was largely systematic. This general self-supply of new properties was largely removed by that reform.

Today, the self-supply of constructed properties remains mainly in two families of situations: assets allocated to an exempt or mixed activity (the central case covered here) and certain social-housing operations under their own regime, sometimes at a reduced rate. Outside these cases, a director who builds for a taxable activity generally bears no net VAT cost from the self-supply.

In practice: an anonymised example#

A business that is only partially liable to VAT has a building constructed that it intends for an exempt activity. During the works, its suppliers charge VAT that it deducts. At completion, because the asset serves an activity with no right to deduction, it must report a self-supply: it charges VAT on the building's cost of production (land, materials, works, costs), without being able to deduct it. This output VAT becomes a definitive cost. Had it ignored the self-supply, the deduction of input VAT during the works would have been unjustified, which an audit would correct with interest and penalties. Anticipating the operation from the building permit would have let it budget this cost and weigh building against buying.

The self-supply is no dusty technicality: it is a classic audit checkpoint on the property operations of partially taxable businesses. Our conviction, on construction files, is that the allocation of the asset must be settled as early as possible, ideally before the first works invoice. That decision drives input-VAT deductibility, the triggering of the self-supply and its cost.

The topic also reveals the quality of monitoring. Rigorous project cost accounting, a clear allocation file and a documented ratio computation turn a risky operation into a mere formality.

Since 1 September 2026, the VAT provisions of the CGI have been recodified into the Code of Levies on Goods and Services (CIBS), Book II, on a constant-law basis. The substance does not change: only the numbering evolves. References to the CGI, including article 257, remain legally valid until 31 December 2027. You can therefore keep reasoning on the principles described here, bearing in mind that article references will be progressively updated.

On the substance, stay alert to any change in the allocation of your properties: it is the change of use, more than the construction, that creates the risk.