IESET.
Policies·stp_vat_introduction_2023

Sao Tome and Principe VAT introduction 2023

STP·2023 – present·ADI Trovoada governmentcandidate
movestax corporate↑rule of law↑

What the policy did

Sao Tome and Principe introduced a value-added tax in 2023 as a central tax-modernisation measure, replacing narrower consumption-tax arrangements with a broader invoice-credit VAT system. The reform was designed to mobilize domestic revenue, improve compliance, and support fiscal consolidation under the country's IMF-backed macroeconomic programme.

Policy-content fingerprint — what this policy moved, on which axes

Per invariant 3, reforms are scored by what they did on each channel-separated axis, not by the party that enacted them. This fingerprint is how the policy-match engine finds historical analogues.

intended
↑
tax corporate
fiscal.tax_corporate
Statutory and effective corporate tax rates, treatment of depreciation, and international competitiveness.
increased · moderate
higher corporate tax burden
VAT broadens taxable transactions and increases compliance obligations for registered firms.
↑
rule of law
institutional.rule_of_law
Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
increased · weak
stronger rule of law
Invoice-credit VAT administration creates more formal records for tax enforcement.

Enacted by

Empirical evidence — linked hypotheses

Explicit links are curated by the author. Inferred links are hypotheses in the library that test the same axes this policy moved — the framework's answer to "what does the data say about a policy like this?".

El Salvador's FDI inflow, real-GDP growth, tourism arrivals, and business-formation rate accelerated under the Bukele era (2019-2024) relative to a Central American peer-country donor pool (Honduras, Guatemala, Nicaragua, Costa Rica, Panama, Dominican Republic).
bukele_fdi_gdp_investment_climate_2019_2024inferred
viainstitutional.rule_of_law
PARTIAL — mean_gap=-0.697, |gap|/pre_sd=1.2, p_perm=1 (gap below 0.5×pre_sd or placebo p≥0.10)
partial
Following El Salvador's perceived success with the régimen de excepción (March 2022 onward) and the homicide-rate collapse, multiple Latin American jurisdictions enacted Bukele-style emergency measures: Honduras (Estado de Excepción in select municipalities, December 2022), Ecuador (Estado de Excepción + designation of gangs as terrorist organisations, January 2024), Peru (Estado de Emergencia in Lima/Callao, 2023-).
latam_bukele_imitation_effect_homicide_security_stateinferred
viainstitutional.rule_of_law
PARTIAL — ATT=+0.03571, p=0.598, N=99, treated_countries=1 (above α=0.10)
partial
Across a pre-registered panel of OECD and major emerging-market economies from 1996 to 2023, stronger rule-of-law institutions predict faster real GDP per capita growth after country and year fixed effects and basic macro controls.
market_order_rule_of_law_gdp_pc_growth_panelinferred
viainstitutional.rule_of_law
PARTIAL — coef=-0.08348, p=0.913 (above α=0.1); direction inconclusive
partial
Across a pre-registered panel of OECD and major emerging-market economies from 1996 to 2023, stronger rule-of-law institutions predict higher high-technology export intensity after country and year fixed effects and basic macro controls.
market_order_rule_of_law_high_tech_exports_panelinferred
viainstitutional.rule_of_law
PARTIAL — coef=+0.621, p=0.746 (above α=0.1); direction inconclusive
partial
Across a pre-registered panel of OECD and major emerging-market economies from 1996 to 2023, stronger rule-of-law institutions predict higher private and total investment shares after country and year fixed effects and basic macro controls.
market_order_rule_of_law_investment_share_panelinferred
viainstitutional.rule_of_law
PARTIAL — coef=-0.3477, p=0.814 (above α=0.1); direction inconclusive
partial
Across a pre-registered panel of OECD and major emerging-market economies from 1996 to 2023, stronger rule-of-law institutions predict deeper private credit intermediation after country and year fixed effects and basic macro controls.
market_order_rule_of_law_private_credit_depth_panelinferred
viainstitutional.rule_of_law
PARTIAL — coef=+4.153, p=0.513 (above α=0.1); direction inconclusive
partial
El Salvador's second Bukele term (post-2024 inauguration, with continued régimen-de-excepción and worsening institutional-quality scores) maintains FDI inflows, GDP growth, and tourism arrivals trajectories established in 2019-2024 despite mounting authoritarianism critique (V-Dem electoral-democracy decline, WGI rule-of-law score continuing to fall, Freedom House "partly free" downgrade).
bukele_phase2_post_2024_authoritarian_growth_premiuminferred
viainstitutional.rule_of_law
PARTIAL — mean_gap=-0.3577, |gap|/pre_sd=0.051, p_perm=0.143 (gap below 0.5×pre_sd or placebo p≥0.10)
partial
Across emerging-market and developing economies 1990-2020, stronger contract enforcement — measured by years to resolve a commercial dispute, contract-enforcement index, and legal-origin dummies — predicts whether foreign-direct-investment inflows produce productivity spillovers to domestic firms rather than enclave effects.
contract_enforcement_fdi_productivity_spilloversinferred
viainstitutional.rule_of_law
SUPPORTED — coef=+0.1145 (sign matches claim +), p=0.0196
supported

Similar historical policies

Ranked by axis-fingerprint overlap with this policy. Direction match bolded — those are the closest historical analogues. Shape of the match is what drives policy-outcome comparison, not the country or party label.

Indonesia tax reform and VAT introduction (1983-1985)
IDN·1983
match
1.1
tax corporaterule of law
Mauritius global business tax reform 2018
MUS·2018
match
1.1
tax corporaterule of law
Comoros IMF ECF fiscal governance programme 2023
COM·2023
match
1.0
tax corporaterule of law
Cabo Verde IMF ECF fiscal consolidation 2022
CPV·2022
match
1.0
tax corporaterule of law
Djibouti IMF ECF fiscal and debt reforms 2024
DJI·2024
match
1.0
tax corporaterule of law
Apple state-aid case compliance — €14.1bn Exchequer receipt (2024)
IRL·2024
match
1.0
tax corporaterule of law
Extra-profit sectoral taxes (Hungary, 2022)
HUN·2022
match
0.8
tax corporate
UK Corporation Tax main rate increase to 25% (April 2023)
GBR·2023
match
0.8
tax corporate

References