🔎 Fiscal Horsepower & Grey Card Cost: Understanding Everything in 2026

The Fiscal Horsepower (P.6) is the determining factor for the price of your vehicle registration certificate (grey card) in France. Unlike the actual power (kW), the Fiscal Horsepower (CV/HP) is an administrative and fiscal unit. Its value is essential for calculating the Regional Tax (Y.1), which makes up the majority of the total cost of your process. Our tool uses official formulas and the definitive 2026 scales to guarantee you the best estimate.

🔥 The Official Formula for Fiscal HP (CV)

Since the reform, the formula for calculating Fiscal Horsepower no longer depends on engine torque or CO2, but solely on Engine Power (P.2) expressed in kilowatts (kW), ensuring consistency regardless of the fuel type or engine.

💶 Environmental Surcharge and Weight Tax 2026: New Scales and Caps

The State applies two dissuasive taxes, called "surcharges", which are added to the grey card cost, primarily for new or imported used vehicles (first registration in France). In 2026, these ecological transition measures have been significantly tightened.

1. The CO2 Tax (Environmental Surcharge, Field V.7)

• New 2026 Threshold: The surcharge is now triggered starting from 108 grams of CO2 per kilometer (g/km), according to the WLTP cycle.
• 2026 Cap: The surcharge amount can now reach €80,000 for the most polluting vehicles (from 192 g/km).
• Usage: This tax applies to the first registration in France (purchase of a new vehicle or import).

2. The Tax on Mass in Running Order (Weight Surcharge, Field G.1)

• New 2026 Threshold: Applicable to vehicles whose Mass in Running Order (G.1) exceeds 1,500 kg (compared to 1,600 kg previously).
• Progressive Calculation: The rate scales in steps: €10/kg from 1500 to 1699 kg, €15/kg from 1700 to 1799 kg, and climbs to €30/kg above 2000 kg.
• Global Cap: The cumulative amount of the CO2 Surcharge and the Weight Surcharge is limited to the new €80,000 cap in 2026.

Note on the Ecological Bonus and Electric Vehicles

If your vehicle is 100% electric or hydrogen-powered, it remains totally exempt from the CO2 Surcharge and the Weight Surcharge in 2026.
Furthermore, the purchase of a new electric vehicle may qualify for the Ecological Bonus (financial aid deducted from the purchase price). In 2026, the aid is maintained (up to €5,700 for the most modest households). To find out the exact amount of your aid, please consult the official government website.

❓ FAQ: Quick Answers on the Grey Card and HP

Does my used vehicle have to pay the Environmental Surcharge?

NO, in most cases. If your used vehicle has already been registered in France, you are exempt from the CO2 surcharge and the Weight surcharge. These taxes only apply to new vehicles or imported used vehicles (with a 10% reduction per year of age for the CO2 surcharge).

What is the impact of vehicle age on the grey card cost?

If your vehicle is 10 years or older (date of first registration), you benefit from a 50% reduction on the Regional Tax (Y.1). This reduction applies directly to the Fiscal Horsepower price in your region. This is a major tax advantage for the purchase of older vehicles.

Why is the HP price different across regions?

The price of the Fiscal Horsepower (HP) is set annually by the Regional Council. These rates vary widely from one region to another, which explains why the final cost of your grey card can double for the same vehicle, solely based on your place of residence.