TRIST - Tariff Reform Impact Simulation Tool

Assessing the fiscal and economic impact of trade reforms requires a robust, flexible simulation tool accessible to policy teams without specialist programming skills or Excel proficiency.

What is TRIST?

• TRIST (Tariff Reform Impact Simulation Tool) is a trade model and Excel-based software solution designed to simulate the short-term impacts of trade reforms (duties, taxes, and non-tariff measures) on import flows, fiscal revenue, domestic production and employment.
• TRIST empowers decision makers to quickly assess adjustment costs related to trade reforms, providing essential insights for informed policy formulation.
• Since 2008, TRIST has been used by many countries and World Bank trade experts to assess the impact of all kinds of trade reforms: unilateral liberalization, preferential trade agreements, WTO accession and more.

What questions can TRIST answer?

TRIST is designed to give policy makers direct, quantitative answers to the questions that matter most when considering a trade reform:

You can use Trade Data & Methodology Search αβΩτ (WITS@AI) to get more information on TRIST.

• What will happen to fiscal revenue?
  TRIST estimates the combined impact of tariff changes on customs duties and all other taxes levied on imports, accounting for exemptions and the precise fiscal base of each tax instrument.
• How will import flows change?
  TRIST projects post-reform import volumes at the tariff line level, capturing substitution effects between trading partners as well as overall demand responses to price changes.
• Which products and sectors are most at risk?
  TRIST can identify products that are fiscally or commercially sensitive, allowing policy makers to anticipate adjustment costs and design mitigation measures before a reform is implemented.
• What would be the impact of removing non-tariff measures?
  Beyond tariffs, duties, and taxes on imports, TRIST can also simulate the lifting of non-tariff measures where relevant data are available, giving policy makers a broader picture of the potential effects of comprehensive trade liberalization.
• What are the consequences for domestic producers and workers?
  Where data are available, TRIST simulates the impact of trade reform on domestic output and employment, sector by sector.
• What if we exempt certain products or apply quotas?
  TRIST's flexible scenario builder allows users to model exceptions, phase-in periods, sensitive product lists, and quota arrangements — reflecting the complexity of real-world trade negotiations.
• How do different reform scenarios compare?
  Because TRIST runs entirely within Excel, policy teams can build, adjust, and compare multiple scenarios quickly, without uploading sensitive data to any external server.

What makes TRIST different?

• Tariff line precision. TRIST operates at the tariff line level, ensuring that simulation results reflect the actual structure of a country's trade and tariff regime rather than broad sectoral approximations.
• Complete fiscal picture. TRIST accounts for tariff exemptions and replicates the precise fiscal base of all taxes and duties levied on imports — customs duties, excise taxes, VAT, and others — providing a comprehensive view of fiscal revenue, not just tariff revenue.
• Flexible scenario design. TRIST handles virtually any type of reform — unilateral liberalization, preferential trade agreements, WTO accession, sensitive product lists, quotas, and phase-in arrangements — through a flexible scenario builder that adapts to the complexity of real-world trade negotiations.
• You remain in the driver's seat. Country group aggregations, tariff line selection, reform scenario definitions, and model parameters are all user-defined — reflecting the fact that no one understands a country's trade structure, priorities, and constraints better than the policy teams working with it every day.
• Full transparency. TRIST is built entirely in Microsoft Excel, with all computational steps visible and verifiable through standard Excel formulas. There are no black boxes — policy teams can inspect, audit, and adapt the model to incorporate local knowledge.
• Data sovereignty. All simulations run locally on your computer. No data is uploaded to any external server, ensuring that sensitive trade and fiscal data remains fully under your control.

What are TRIST's data requirements?

• Minimum dataset: Tariff line level data on import value and fiscal revenue from tariff (customs duty) and any other tax or duty levied on imports (excise, VAT...) by country of origin as recorded by the Customs administration;
• Optional data:
  • data on domestic output and employment by sector usually provided by national statistics offices;
  • data on non-tariff measures

How does TRIST's simulation engine work?

TRIST uses a static partial equilibrium model that simulates the short-term impacts of trade reform through up to four channels:

• Direct revenue effect. The immediate revenue losses associated with abolishing or lowering duties and taxes.
• Exporter substitution. Goods previously imported from one country are redirected from the country benefiting from the tariff reduction, as lower tariffs make it a more competitive source.
• Domestic substitution. Goods previously produced domestically are displaced by cheaper imports following tariff liberalization.
• Demand effect. Overall consumption of a product increases as its price falls due to tariff liberalization.

The model rests on a small number of transparent assumptions:

• No substitution occurs between distinct products (i.e., different tariff lines are treated as separate markets).
• Imperfect substitution is assumed among varieties of the same product from different source countries, following the Armington assumption of heterogeneous goods. This is extended to domestic production, with a distinct substitution elasticity between imports and domestically produced goods.
• TRIST operates under the small country assumption, meaning the market being modeled is not large enough to influence world prices.
• All computations are elasticity-based, expressed as percentage changes relative to a baseline. As a result, products with zero initial imports remain at zero after a tariff change, and no new exporters can enter the market as a consequence of the reform.

What results does TRIST produce?

A completed TRIST simulation delivers a comprehensive, multi-dimensional view of the impact of a trade reform — from the broadest aggregates down to individual tariff lines. Results can be explored at any level of detail: total economy-wide impacts, sector breakdowns, or individual product lines. And because TRIST supports concordance with both ISIC and GTAP nomenclatures in addition to the standard HS classification, results integrate seamlessly into broader economic analyses and international comparisons — and can serve as inputs to computable general equilibrium (CGE) models for deeper, economy-wide impact assessment.

For each reform scenario, TRIST puts pre- and post-reform figures side by side, making it straightforward to assess:

• Trade flows: how import volumes shift across products, sectors, and trading partners
• Fiscal revenue: the impact on each individual duty and tax, from customs duties to excise and VAT
• Tariff and tax rates: applied rates and price changes resulting from the reform
• Domestic sector: projected changes in domestic output and employment where data are available

The result is not just a set of numbers, but a ready-to-use analytical framework that supports evidence-based policy dialogue — from technical teams to ministerial briefings.

Download TRIST

TRIST is completely free. To ensure you always have the latest version, download the package directly from this page. The package contains everything you need to get started:

• TRIST Excel files — the Aggregation file and the Simulation file
• Documentation — available in two formats: a PDF reference manual and a CHM Windows help file that integrates directly with TRIST in Excel to provide contextual help
• README file — please review this first before getting started

Download the latest version of TRIST.

If you want to test whether TRIST fits your needs or simply get familiar with the tool
, Download the demo package .
It comes pre-loaded with a demo dataset so you can dive straight in and explore everything TRIST has to offer before committing to the data collection effort.

If you want to review the documentation first, you can download the PDF version of TRIST complete help file.

THIRD-PARTY CREDITS

TRIST embeds several external sources for simulation purpose. The provision of these datasets does not imply any endorsement by their authors of TRIST or the methodologies used, nor can any errors arising from their use in TRIST be attributed to them.

1. Elasticity of Exporter Substitution:
   Lionel Fontagné, Houssein Guimbard and Gianluca Orefice: Tariff-based product-level Trade Elasticity, Journal of International Economics, 2022, vol 137.
   For all information and access to the dataset, visit the dedicated page on the Institute for Macroeconomic and International Policies (i-MIP) website.


2. Elasticity of demand:
   Hiau Looi Kee, Alessandro Nicita, Marcelo Olarreaga; Import Demand Elasticities and Trade Distortions. The Review of Economics and Statistics 2008; 90 (4): 666–682.
   
   
3. Import Demand Elasticities Revisited:
   Ghodsi, M., J. Grübler and R. Stehrer (2016), ‘Import Demand Elasticities Revisited', wiiw Working Paper, No. 132, November.
   For all information and access to the dataset, visit the dedicated page on website of the Vienna Institute for International Economic Studies (wiiw).

Disclaimer

The Tariff Reform Impact Simulation Tool (TRIST) is an Excel‑based analytical tool developed by the World Bank and made available through the World Integrated Trade Solution (WITS) platform. TRIST is provided free of charge as a global public good for analytical, research, educational, and policy‑support purposes only.

TRIST is provided “as is”, without warranty of any kind. The World Bank makes no representations or warranties regarding the accuracy, completeness, reliability, or fitness for any particular purpose of the tool or any results generated using it. Use of the tool and reliance on any outputs are entirely at the user’s own risk.