1. ANSWER — Credible sources indicate ITEP.org has a left-center bias due to its advocacy for progressive tax policies that raise rates on high earners and corporations, though it maintains high factual reporting.12

2. EVIDENCE — Media Bias/Fact Check rates ITEP Left-Center biased with High factual reporting (updated Dec 20, 2024), noting its favoritism toward liberal economic policies but proper sourcing and no failed checks.1 Wikipedia describes it as left-leaning, citing Pew and WaPo, while associating it with liberal Citizens for Tax Justice.3 InfluenceWatch (updated 2025) calls it left-of-center, funded by Ford Foundation ($2.35M 2006-2024), Wellspring ($700k/year 2018-2022), Rockefeller ($750k 2022), and others like Joyce and Kellogg; leadership from progressive orgs like Policy Matters Ohio.2 ITEP self-describes as non-partisan, focusing on data-driven equity in taxes (itep.org/about, accessed 2026).4 Tax Foundation (2018) disputes its "Who Pays?" methodology for omitting progressive taxes like estate and corporate, using snapshot income.5

3. CRITICAL CONTEXT — Skepticism arises from ITEP's consistent criticism of tax cuts for the wealthy (e.g., Trump policies) and push for higher corporate/high-earner taxes, funded by left-leaning philanthropies, suggesting an ideological lens despite factual rigor. Trust stems from its microsimulation model used across the spectrum and high fact ratings; transparency gaps include limited public donor lists beyond grants.

STRONGEST SUPPORTING ARGUMENT — Media Bias/Fact Check rates ITEP Left-Center biased for favoring liberal policies like progressive taxation, backed by InfluenceWatch's documentation of $ millions from left foundations (Ford, Wellspring, Rockefeller) and leadership from progressive groups like Citizens for Tax Justice, whose work critiques GOP tax cuts and promotes taxing "millionaires and billionaires."12

STRONGEST COUNTERARGUMENT — ITEP claims non-partisan status with a rigorous microsimulation model cited by media and policymakers across parties, earns High factual reporting from MBFC with no failed checks, and is called nonpartisan by outlets like Mother Jones and USA Today, indicating reliable data despite policy leanings.134

BOTTOM LINE — ITEP.org is a left-center biased source: it produces factual research but consistently advocates progressive tax hikes on the wealthy and corporations, funded primarily by left-leaning donors.

5. CREDIBILITY — 9

6. EVIDENCE — 10

7. BIAS — CENTER-LEFT

8. CATEGORY — Politics & Government