Case Study: Singapore's Carbon Tax Decision
How does a jurisdiction actually choose between carbon tax and ETS? Singapore's decision-making process illustrates the framework in action. As a small, trade-dependent city-state with limited renewable options, Singapore faced unique constraints that shaped its approach.
Singapore's Context
Understanding Singapore's choice requires understanding its circumstances.
Emissions profile:
- Total: About 50 million tons CO2e annually
- Power and industry: Over 80% of emissions
- Transport: About 14%
- Agriculture and waste: Minimal
- Highly concentrated: About 30-40 large facilities account for most emissions
Economic structure:
- Small, open economy
- Manufacturing hub (petrochemicals, electronics, pharmaceuticals)
- Major international business center
- Limited land and natural resources
- No domestic fossil fuel production
Energy situation:
- Almost entirely dependent on imported natural gas
- Limited renewable potential (small land area, consistent cloud cover)
- Already among the most efficient power systems globally
- Few low-cost abatement options available
Political context:
- Single-party government with long planning horizons
- Strong state capacity
- Pro-business orientation
- Commitment to climate action despite development challenges
Singapore's circumstances are unusual: a wealthy, highly urban, trade-dependent economy with concentrated emissions but limited low-carbon alternatives. This shaped its instrument choice significantly.
The Decision Process
Singapore conducted extensive analysis before announcing its carbon tax in 2017.
Assessment questions considered:
- What coverage is needed?
- What administrative capacity exists?
- What are the competitiveness implications?
- What is politically feasible?
- What revenue approach makes sense?
- What is the optimal timeline?
Why Singapore Chose a Carbon Tax
Reason 1: Administrative simplicity
With only 30-40 major emitters accounting for most emissions, Singapore could cover the bulk of emissions with a simple tax without building ETS infrastructure.
Singapore's emissions are like a small pond with a few big fish, not an ocean with thousands of small ones. You can count and price the big fish directly rather than building an elaborate trading market.
Reason 2: Price certainty for business planning
Singapore's business-oriented government prioritized giving companies clear cost signals. A carbon tax provides more predictable costs than ETS for facility planning.
Reason 3: Limited trading benefits
With only dozens of large emitters, there would be limited liquidity in a trading market. The efficiency gains from trading would be modest.
Reason 4: International linkage not priority
Singapore was not seeking to link with other carbon markets. Without linkage aspirations, a key ETS advantage was not relevant.
Reason 5: Quantity certainty less critical
Singapore's NDC commitment was expressed in carbon intensity terms (emissions per GDP), not absolute emissions. This made quantity certainty less critical than for countries with absolute caps.
Singapore's assessment summary:
| Factor | Assessment | Favors |
|---|---|---|
| Emissions concentration | High (30-40 major facilities) | Either |
| Administrative capacity | Strong tax authority | Carbon tax |
| ETS infrastructure | Would need to build | Carbon tax |
| Trading liquidity | Would be limited | Carbon tax |
| Business planning needs | Price certainty valued | Carbon tax |
| Linkage aspirations | Low priority | Carbon tax |
| NDC structure | Intensity-based | Carbon tax |
The assessment clearly pointed to carbon tax as the better fit.
Design Features
Singapore's carbon tax reflects its specific context:
Coverage:
- Facilities emitting 25,000+ tons CO2e annually
- About 40 facilities covered
- Covers roughly 80% of national emissions
Rate trajectory:
- 2019-2023: SGD $5/ton (~$4)
- 2024-2025: SGD $25/ton (~$19)
- 2026-2027: SGD $45/ton (~$34)
- 2030: SGD $50-80/ton (~$38-61)
No exemptions: Unlike many carbon taxes, Singapore provides no sectoral exemptions. All covered facilities pay the full rate.
Transition support: While no exemptions exist, transition support includes:
- Industry transformation programs
- Energy efficiency grants
- Research and innovation funding
Singapore's decision to provide no exemptions was unusual and deliberate:
The rationale:
- Exemptions undermine the carbon price signal
- They create lobbying for more exemptions
- They complicate administration
- Singapore's covered facilities compete globally regardless of local exemptions
Instead of exemptions:
- Low initial rate allows adjustment
- Gradual rate increases provide transition time
- Direct support programs help firms upgrade
- Revenue recycling supports affected industries
The trade-off: This approach maintains a cleaner price signal at the cost of higher industry burden. Singapore's strong state capacity and business-government relationships made this feasible.
Results: The carbon tax has been implemented without major industry pushback, partly because the initial rate was low and increases are gradual.
Revenue Use
Singapore uses carbon tax revenue for:
Transition support (majority):
- Industry transformation programs
- Energy efficiency improvements
- Research and development
- Workforce skills upgrading
No household rebates:
Unlike Canada or Switzerland, Singapore does not return revenue to households. This reflects:
- The tax applies to industry, not directly to consumers
- Singapore's government is comfortable retaining revenue for programs
- No political pressure for dividends
Evolution Over Time
Singapore's carbon tax is evolving:
Rate increases: The trajectory from $5 to $50-80 represents a more than 10× increase, signaling serious long-term commitment.
International credits: Singapore allows covered entities to use eligible international carbon credits to offset up to 5% of taxable emissions. This provides some flexibility while maintaining the tax structure.
Article 6 engagement: Singapore is actively pursuing bilateral agreements under the Paris Agreement's Article 6 to access high-quality international credits.
Lessons from Singapore
1. Context shapes choice
Singapore's specific circumstances made a carbon tax clearly preferable. A different jurisdiction with different circumstances might reach different conclusions.
2. Simplicity has value
With concentrated emissions and strong state capacity, Singapore chose the simpler instrument and avoided the complexity of ETS infrastructure.
3. Price certainty matters for business
Singapore's business-oriented government valued the predictable costs that a carbon tax provides.
4. Evolution is planned
Starting low and increasing over time allowed adjustment while signaling serious commitment.
5. No exemptions can work
With the right support programs and gradual introduction, a clean carbon price without carve-outs is politically feasible.
Singapore demonstrates that the "right" instrument depends entirely on context. Its choice of carbon tax was driven by specific factors: concentrated emissions, limited trading gains, price certainty preferences, and strong administrative capacity. Other jurisdictions with different contexts make different choices.
Looking Ahead
We have now explored the factors that guide instrument choice. The next module turns to a critical challenge for any carbon pricing system: managing impacts on competitiveness, employment, and households.