Methodology
FMtak separates official rule inputs from planning estimates. This methodology explains the exact calculation flow, data boundaries, rounding, long-term projections and source-review process used across the site.
Calculation inputs that come from the notified BH framework
- Invoice-price slabs: below ₹10 lakh, ₹10–20 lakh and above ₹20 lakh.
- Base rates: 8%, 10% and 12%.
- Diesel adjustment: +2 percentage points.
- Electric-vehicle adjustment: −2 percentage points.
- Two-year multiplier: 1.25 × 2 ÷ 15.
- Initial tax periods: two years or multiples of two years.
How FMtak calculates a result
- Read the invoice price excluding GST entered by the user.
- Assign the correct base slab.
- Apply the selected fuel adjustment.
- Calculate the notional motor vehicle tax.
- Apply the notified two-year formula.
- Round upward to the next integer for the displayed result.
What FMtak deliberately does not guess
State road tax, registration fees, dealer charges, insurance, State EV incentives and user-specific portal adjustments are not silently invented. Where such data is needed, the tool asks the user to enter an official/verified amount or directs the user to the government portal.
Projection policy
Long-term totals repeat the current two-year amount only to illustrate cash flow. They are labelled illustrative because future rules can change. A future payment timeline is never presented as a legal due-date schedule.
Rounding and Indian currency formatting
The two-year result is rounded upward to the next integer. Display values use Indian digit grouping to make lakh/crore-scale numbers easier to read.
Source review and change control
Rule sources were reviewed on 30 September 2026. FMtak links to the 2021 notification, 2022 amendment, 2024 implementation advisory and current Parivahan service. A reviewed date is not real-time monitoring, so users should verify the live government amount before payment.
How corrections should be handled
If a government source changes, the site owner should update the calculation logic, affected examples, FAQ answers, source-review date and sitemap modification dates together. This prevents a new year in the title from masking stale calculation logic.
Rule source reviewed: 30 September 2026. Primary references: MoRTH G.S.R. 594(E), 26 Aug 2021, MoRTH 2022 amendment and the current Parivahan portal. Final payable tax and eligibility are determined by the government system/registering authority.
Frequently Asked Questions
Does FMtak calculate state road tax automatically?
No. State road-tax rules differ, so the comparison tool asks you to enter an official state-tax amount instead of assuming one generic percentage.
How does FMtak round the BH tax result?
The calculated two-year result is rounded upward to the next integer in line with the wording of the notified calculation rule.
When were the rule sources last reviewed?
The source set used for this release was reviewed on 30 September 2026.