After registration the canton bills an annual vehicle tax. It is not an import cost, but it matters for your budget.
Ticino
The tax follows the formula in force since 2024: (mass × 0.1 + kW × Kv) × K, with K = 1 and Kv depending on the powertrain (petrol 2.4, diesel 2.5, electric 0.2).
Geneva and Zürich
The tax depends on criteria such as power, weight and emissions. Use the official calculator of the canton linked below.