FASTag is a prepaid RFID tag affixed to your windscreen. As you approach a plaza, the reader deducts the toll automatically from the account tied to the tag.
The rule
Since February 2021, electronic toll collection is the only mode of payment across national highways. A vehicle without a valid, tagged account that enters the FASTag lane is charged twice the toll after the CCTV captures it — the double-charge rule exists precisely to discourage the non-tag lane crowd.
Why it matters
- The double charge is an automated penalty for entering a FASTag lane without a functional tag.
- Keeping the account topped up and the KYC complete avoids both the penalty and a lane block.
- The tag is tied to the vehicle registration, so swapping tags between vehicles triggers the penalty.
Key takeaways
- FASTag is mandatory at toll plazas.
- No valid tag in the FASTag lane = double toll.
- KYC-complete, topped-up tags keep trips smooth.
What counts as "without a valid tag"
- No tag fitted at all.
- A tag whose account balance is zero or KYC-incomplete.
- A tag affixed to a different vehicle number than the one on the plaza.
- A damaged or inactive tag.
What you should do
- Fit one FASTag per vehicle and never share tags between vehicles.
- Top up before long trips and complete the mandated KYC.
- If you were double-charged wrongly, dispute through your tag issuer with the plaza’s CCTV proof.