# Road Tax Calculator Singapore — by engine cc

Source page: https://valem.run/calculators/singapore/car-tax

Singapore's road tax for petrol cars is a formula by engine capacity, billed every six months.

**Tax year:** 2026

## How it is calculated

Singapore road tax for a petrol car is a formula based on engine capacity in cc, billed every six months. Larger engines pay progressively more.

Cars over ten years old pay escalation surcharges, and electric cars pay by power rating plus a flat component. The calculator uses engine-cc bands. Estimate, not advice.

## Worked example

With Engine capacity of 1,598, this model computes Annual road tax of 741.72 SGD.

## Inputs

| Name | Label | Type |
| --- | --- | --- |
| `cc` | Engine capacity (cc) | number |
| `ageYears` | Vehicle age (years) | number |

## Sources

- [OneMotoring road tax calculator](https://onemotoring.lta.gov.sg) (checked 2026-08-05)

## What this page claims

The Valem engine reproduces this model's formula through 3 self-test cases. That shows internal consistency, not that the formula matches current law; the cited sources are the evidence for that. Estimate, not tax advice.

## For agents

- Model manifest (formula, constants, test vectors): https://valem.run/calculators/singapore/car-tax.json
- Compute by URL: https://valem.run/calculators/singapore/car-tax.json?cc=1598
- MCP: https://valem.run/mcp/calculators (call `calculate` with calculator `singapore/car-tax`)