RTO Tax Calculator Bihar 2026

Vehicle Registration Process in Bihar

Vehicle registration in Bihar is handled by the Bihar State Transport Department with RTO offices in all 38 districts. Key RTO locations include Patna (BR-01), Gaya (BR-02), Muzaffarpur (BR-03), Bhagalpur (BR-04), Darbhanga (BR-05), and Purnia (BR-06). The process is standardised through the national VAHAN portal, making it largely digital.

When you purchase a new vehicle from a dealership in Bihar, the dealer issues a temporary registration valid for 30 days. You must apply for permanent registration at the RTO within this window. The application is submitted through Form 20 along with the required fee. The RTO verifies the vehicle, and once approved, the registration number is issued in the BR-XX-XXXX format. The smart card RC is delivered to your registered address.

Required Documents

• Form 20 (Registration Application)
• Form 21 (Sale Certificate from Dealer)
• Form 22 (Roadworthiness Certificate)
• Valid Insurance Policy (minimum 1 year third-party)
• Address Proof (Aadhaar, Voter ID, Electricity Bill)
• Identity Proof (Aadhaar, PAN, Passport)
• Original Invoice and Delivery Challan
• PUC Certificate
• HSRP booking receipt
• Passport-size photographs

Road Tax Calculation in Bihar

Bihar uses a slab-based road tax system with the same rates for petrol, diesel and CNG cars: 8% up to ₹1 lakh, 9% for ₹1–8 lakh, 10% for ₹8–15 lakh and 12% above ₹15 lakh plus 1% road safety cess. There is no fuel-based differentiation.

For example, a ₹1 lakh car pays ₹8,000 (8%). A ₹10 lakh car falls in the ₹8–15 lakh slab and pays 10% or ₹1,00,000 plus ₹10,000 cess. A ₹50 lakh car pays 10% or ₹5,00,000 plus ₹50,000 cess. A luxury ₹2 crore car attracts 12% + 1% cess — ₹26,00,000 — which is still significantly lower than in states like Kerala or Karnataka where rates can exceed 18-20% at that price point.

EV Exemption in Bihar

Bihar offers a 75% road-tax rebate for electric vehicles as part of its clean mobility initiatives. The state has been promoting EV adoption through the Bihar EV Policy, under which EVs pay only 25% of the normal road tax; the registration fee is charged at the normal rate. This can save EV buyers anywhere from ₹50,000 to several lakh rupees depending on the vehicle price. The state has also announced plans for charging infrastructure in Patna, Gaya, and Muzaffarpur.

Two-Wheeler Rates

Two-wheelers in Bihar pay 9% of ex-showroom price up to ₹1 lakh, 10% for ₹1–8 lakh, 11% for ₹8–15 lakh and 13% above ₹15 lakh, plus 1% road safety cess. Registration fee is ₹300 and HSRP charge is ₹200. For a popular commuter bike priced at ₹1 lakh, the road tax is ₹9,000 (9% slab) plus ₹1,000 cess — the total registration cost including fee and HSRP comes to approximately ₹10,500. Electric two-wheelers get the 75% road-tax rebate and pay the registration fee.