Calculate ISV

Calculate Imposto Sobre Veiculos (ISV) for a vehicle.

Supports:

• Passenger vehicles (Tabela A): cilindrada + CO2 components
• Commercial vehicles (Tabela B): cilindrada only, percentage-based
• Motorcycles (Tabela C): fixed tax by cilindrada
• Used EU imports: age discount
• Hybrid/plug-in/natural gas: special discounts

Required fields:

• cilindrada_cm3 (int): Engine displacement in cm3
• fuel_type (str): gasolina, gasoleo, electrico, hibrido_gasolina, hibrido_gasoleo, plugin_gasolina, plugin_gasoleo, gas_natural, gpl

Optional fields:

• co2_gkm (int): CO2 emissions in g/km
• emission_test (str): NEDC or WLTP (default: WLTP)
• vehicle_category (str): passenger, commercial, motorcycle (default: passenger)
• is_used_import (bool): Is this a used EU import? (default: false)
• first_registration_date (str): YYYY-MM-DD for age discount
• electric_range_km (int): Electric range in km (for hybrids)
• particle_emissions_gkm (float): Particle emissions g/km (diesel)
• commercial_subtype (str): For Tabela B vehicles
• is_7_seater_over_2500kg (bool): 7+ seater, >2500kg, not 4x4
• vehicle_id (int): Pre-fill from existing vehicle in stock
• tax_year (int): Tax year for rate lookup (default: 2026)