IESET.
Hypotheses·distribution·tax_inequality_estonia_1994_flat_tax_dividend_reform

Estonia's 1994 flat-tax 26 percent (subsequently reduced to 20 percent by 2015) and the unique 2000 corporate-tax reform (taxing only distributed corporate profits) produced a measurable rise in the Estonian top-1 pretax income share over 1994-2010 vs Baltic synthetic comparator (LVA, LTU), with the distributed-profit-only corporate regime channelling capital-income into top-decile reported income while reducing taxation of retained earnings.

The discriminating test is the synth-control gap on top-1 share against LVA/LTU.

INCONCLUSIVEengine/runs/tax_inequality_estonia_1994_flat_tax_dividend_reform

INCONCLUSIVE_DATA_PENDING — insufficient pre-period coverage (years=1, donors=0)

confidence cueResult card produced; verdict unclassified.

policy briefCoverage too thin

In ordinary language

Over a long period, do more market-oriented institutions translate into higher income or productivity, once the comparison looks beyond a single success story?

plain answer

This test cannot make a firm call yet. insufficient pre-period coverage (years=1, donors=0)

why it matters

Distributional claims often sound morally clear but are empirically complex. This test asks whether the proposed channel explains real differences across places.

how the test works

It compares 3 country or place units from 1994 to 2015, using a synthetic control design, with fixed effects for country and year.

what was measured
What changed
  • Est flat tax post 1994
  • Top marginal income tax rate
What we checked
  • Top 1pct pretax income share
what this does not prove

A single test is not the whole truth. It narrows the claim under a specific sample, time period, and method. Strong policy conclusions need the pattern to survive nearby tests, alternative data, and serious objections.

verification

No evidence packet has been generated yet.

Results

engine/runs/tax_inequality_estonia_1994_flat_tax_dividend_reform
1007550250199420052015ESTLVALTU
illustrative sketch · run pending
No coefficients yet. When the model fires, this chart will show top_1pct_pretax_income_share across 3 sampled countries over 1994–2015.
The shapes above are stylised — none of the lines are real data.
Placeholder for tax_inequality_estonia_1994_flat_tax_dividend_reform. Published chart will be generated from engine/runs/tax_inequality_estonia_1994_flat_tax_dividend_reform/chart_data.json.

Pre-registration

registration ordering unverified
first-spec commit 4c8ce8e · 2026-07-18T22:11:21Z
run generated · 2026-05-04T12:34:34Z
Run timestamp predates this path's first git-add commit (rebase, rename, or pre-git local run). Spec hash is still the path's first-add commit — not repository HEAD — but ordering is not a clean pre-registration proof.

Estonia's 1994 flat-tax 26 percent (subsequently reduced to 20 percent by 2015) and the unique 2000 corporate-tax reform (taxing only distributed corporate profits) produced a measurable rise in the Estonian top-1 pretax income share over 1994-2010 vs Baltic synthetic comparator (LVA, LTU), with the distributed-profit-only corporate regime channelling capital-income into top-decile reported income while reducing taxation of retained earnings. The discriminating test is the synth-control gap on top-1 share against LVA/LTU.

Falsification criterion — what would disprove this

set before the run · honoured after

This hypothesis is considered falsified if:

SUPPORTED if Estonian top-1 pretax share is at least 1.0 percentage point above Baltic synth at the 2010 horizon AND dividend share of top-decile income exceeds Baltic comparator average by 3 percentage points at p<0.10. REFUTED if no detectable gap or negative gap at horizon.

formal test & threshold
test:      Synthetic-control with Baltic donor pool (LVA, LTU), treated EST 1994. Composition robustness via dividend-share decomposition.

Method

Template
synthetic_control
Fixed effects
country, year
Clustering
country
Sample
3 countries · 1994 – 2015
Evidence type
associational

Synthetic-control with Baltic donor pool. Treated EST 1994.

Data

VariableSourceTransform
top_1pct_pretax_income_share
outcome
owid:top-1-share-of-total-incometier 2
level
est_flat_tax_post_1994
treatment
constructed:indicator = 1 for EST, year >= 1994tier 5
indicator
top_marginal_income_tax_rate
treatment
owid:top-marginal-income-tax-ratetier 2
level
log_real_gdp_per_capita
control
world_bank_wdi:NY.GDP.PCAP.KDtier 2
log
trade_openness
control
world_bank_wdi:NE.TRD.GNFS.ZStier 2
level

● ready  · ● pending  · ● reconstruct-needed

Detailed result card

Result card — tax_inequality_estonia_1994_flat_tax_dividend_reform

Verdict: INCONCLUSIVE_DATA_PENDING — insufficient pre-period coverage (years=1, donors=0)

Pre-registration

  • Claim: Estonia's 1994 flat-tax 26 percent (subsequently reduced to 20 percent by 2015) and the unique 2000 corporate-tax reform (taxing only distributed corporate profits) produced a measurable rise in the Estonian top-1 pretax income share over 1994-2010 vs Baltic synthetic comparator (LVA, LTU), with the distributed-profit-only corporate regime channelling capital-income into top-decile reported income while reducing taxation of retained earnings. The discriminating test is the synth-control gap on top-1 share against LVA/LTU.
  • Falsification rule: SUPPORTED if Estonian top-1 pretax share is at least 1.0 percentage point above Baltic synth at the 2010 horizon AND dividend share of top-decile income exceeds Baltic comparator average by 3 percentage points at p<0.10. REFUTED if no detectable gap or negative gap at horizon.

Synthetic-control estimate

  • Error: insufficient pre-period coverage (years=1, donors=0)

Variables resolved

  • owid:top-1-share-of-total-income → top_1pct_pretax_income_share (outcome, n=3294)
  • constructed: indicator = 1 for EST, year >= 1994 → est_flat_tax_post_1994 (treatment, n=66)
  • owid:top-marginal-income-tax-rate → top_marginal_income_tax_rate (treatment, n=590)
  • world_bank_wdi:NY.GDP.PCAP.KD → log_real_gdp_per_capita (controls, n=14066)
  • world_bank_wdi:NE.TRD.GNFS.ZS → trade_openness (controls, n=10714)

Generated by scripts/run_synth_did.py at 2026-05-04T12:34:34+00:00

Notes

Tax-inequality candidate, swarm-S6 batch 6. The Estonian distributed- profits-only corporate tax is unique and uniquely identifying for retention-vs-distribution incentive effects.

Authored framework. Read the transparency note.