Progressivity of the personal income tax schedule, including top marginal rates, bracket spread, and targeted credits (EITC-equivalents).
General government spending as share of GDP, excluding transfers already captured under fiscal.transfer_expansion to avoid double-counting.
Comprehensive personal-income-tax and health-insurance-contribution restructure launched 1 January 2022 under the Morawiecki PiS government. Headline measures: (i) personal-income-tax-free threshold raised from 8,000 zł to 30,000 zł; (ii) first-bracket threshold raised from 85,528 zł to 120,000 zł; (iii) removal of the flat deductibility of the 7.75% health-insurance contribution from PIT liability, with restructured contribution bases (particularly for sole-traders under ryczałt and liniowy regimes); (iv) Polski Ład 2.0 mid-year correction enacted June/July 2022 cutting the first-bracket rate from 17% to 12% and reversing part of the health-contribution treatment. Described by proponents as the largest single tax overhaul in two decades; implementation was chaotic — payroll systems required emergency patches in January 2022 and self-employed tax liabilities required retroactive recalculation after the mid-year correction.
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.
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?".
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.