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PolicyEngine

@policyengine.org
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policyengine.org

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PolicyEngine @policyengine.org · 23/08/2026
PolicyEngine at @iariw.bsky.social in Brussels this week: two papers, two discussions, and a free workshop Thursday 27 Aug with CAPE and BEAMM — talks, a live demo, a roundtable with Belgian policy institutions. Register: policyengine.org/iariw-2026
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PolicyEngine US @us.policyengine.org · 23/08/2026
PolicyBench tests how accurately AI models compute US taxes and benefits. Two new rows: Ox Alpha, a cloaked preview model with no maker named, debuts fourth of 32 at 84.2% of answers within $1. Grok 4.6 debuts eighth at 82.8%, 1.9 points past Grok 4.5. policybench.org
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PolicyEngine @policyengine.org · 13/07/2026
PolicyEngine at the 10th International Microsimulation Association World Congress in Brussels last week:
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PolicyEngine @policyengine.org · 21/06/2026
We're at the International Microsimulation Association World Congress in Brussels, 1–3 July. Three talks: • Maria Juaristi — local microdata calibration with L0 regularisation • Vahid Ahmadi — firm microsimulation + VAT • @maxghenis.bsky.social — hands-on PolicyEngine tutorial
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Max Ghenis @maxghenis.bsky.social · 01/05/2026
We added a ton of ingredients to the @policyengine.org cauldron last month: - 1,039 PRs merged (7× April 2025, 2× March 2026) - 341,318 source-code lines changed - 19 new repos US childcare subsidies, Forbes 400, UK student finance — all make our models more accurate and comprehensive.
Poster with PolicyEngine's April 2026 GitHub Hoard
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PolicyEngine @policyengine.org · 03/05/2026
Today at 11 AM at EAGxDC: why frontier LLMs miss basic tax and benefit math, what changes when AI agents call an open simulator, and where our new initiatives like PolicyBench and the Economic Parameter Atlas come in.
Poster: Harnessing AI for Policy Research
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PolicyEngine US @us.policyengine.org · 15/04/2026
The first analysis from our AI and economics research initiative answers the question: What happens if income shifts from labor to capital? A 10% shift raises the top 1%'s market income share from 25.7% to 29.3%. After taxes and transfers: 21.4% to 24.4%. Policy absorbs 19% of the increase.
CoverMarket income top 1% shareNet income top 1% shareRevenue
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PolicyEngine @policyengine.org · 01/04/2026
Introducing the PE-84. The world's first graphing microsimulator. Pre-order now: policyengine.org/pe84
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PolicyEngine @policyengine.org · 19/03/2026
PolicyEngine received an honourable mention in Impact Canada's G7 GovAI Grand Challenge. We’re encouraged to see open-source infrastructure for tax and benefit analysis recognized as a promising public-sector AI application. impact.canada.ca/en/challenge...
impact.canada.ca
G7 GovAI Grand Challenge | Impact Canada
The G7 GovAI Grand Challenge invites innovators to tackle the pressing challenges faced in adopting responsible AI in the public sector.
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PolicyEngine US @us.policyengine.org · 02/03/2026
We've partnered with @nber.org to build the next chapter of TAXSIM — an open-source, drop-in replacement powered by PolicyEngine's microsimulation engine. Works with CLI, Python, R, Stata, SAS, and Julia. Try it here: policyengine.org/us/taxsim
Dark teal graphic titled "The next chapter of TAXSIM" with subtitle "In partnership with NBER." Left side describes it as an open-source, drop-in replacement for TAXSIM35 powered by PolicyEngine's microsimulation engine, with a link to policyengine.org/us/taxsim. Right side shows a terminal window with install command "pip install policyengine-taxsim," usage example, compatibility badges for CLI, Python, R, Stata, SAS, and Julia, and validation note showing 1,000+ test scenarios passing. PolicyEngine and NBER logos at bottom.
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PolicyEngine US @us.policyengine.org · 28/02/2026
We just launched a plugin that brings PolicyEngine to Claude. Describe any tax or benefit reform in plain English. Claude runs a full microsimulation using our open-source model — 4,000+ variables, 65,000+ parameters, all 50 states. No code required. policyengine.org/us/claude-pl...
Claude Code using PolicyEngine plugin.
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PolicyEngine UK @uk.policyengine.org · 28/02/2026
We just launched a plugin that brings PolicyEngine to Claude. Describe any tax or benefit reform in plain English. Claude runs a full microsimulation using our open-source model — 700+ variables, 1,200+ parameters, NI to UC. No code required. policyengine.org/uk/claude-pl...
Claude Code with the PolicyEngine plugin.
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PolicyEngine US @us.policyengine.org · 13/01/2026
Utah SB60 would cut the state income tax rate from 4.5% to 4.45%, reducing revenues by $84 million in 2026. Who benefits? 53% of Utahns, with higher earners saving more in absolute terms. Our analysis breaks down winners by income decile: policyengine.org/us/research/utah-sb60-income-tax-reduction
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PolicyEngine @policyengine.org · 26/12/2025
Happy holidays from PolicyEngine 🎄
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PolicyEngine @policyengine.org · 02/12/2025
This Giving Tuesday: GiveCalc is live at givecalc.org A free PolicyEngine calculator showing how charitable donations affect your taxes. 🇺🇸 Federal + state tax savings (all 50 states) 🇬🇧 UK Gift Aid relief (including Scotland) Know the true cost of giving → givecalc.org
givecalc.org
GiveCalc - Charitable Donation Tax Calculator
Calculate how charitable giving affects your taxes. Powered by PolicyEngine.
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PolicyEngine @policyengine.org · 31/10/2025
BREAKING: PolicyEngine's microsimulation model projects a surge in candy consumption in the coming hours. Happy Halloween! 🎃
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PolicyEngine @policyengine.org · 30/10/2025
We tested whether Claude Code's multi-agent system could automate parts of policy research. Three specialized agents handled data fetching, script writing, and report generation. Here's what we learned: policyengine.org/uk/research/...
policyengine.org
Testing multi-agent AI workflows for policy research | PolicyEngine UK
A multi-agent Claude Code system fared better on distributional analysis than benefit interactions; insights inform our forthcoming plugin.
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PolicyEngine US @us.policyengine.org · 26/10/2025
California's proposed billionaire tax creates marginal rates of 50-60% on wealth between $1.0-$1.1 billion due to its phase-in structure. We analyzed the math behind Initiative 25-0024: policyengine.org/us/research/...
policyengine.org
Marginal tax rates in California's proposed billionaire tax | PolicyEngine US
The 5% tax creates marginal tax rates between 50% and 60% on wealth between $1 billion and $1.1 billion.
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PolicyEngine UK @uk.policyengine.org · 13/09/2025
📍 London | 25th September | 12:00-18:00 | Central Hall Westminster PolicyEngine 2.0 and the future of public policy analysis Join us for live demos, breakthrough research presentations, and networking with leaders shaping evidence-based policymaking. www.eventbrite.co.uk/e/policyengi...
eventbrite.co.uk
PolicyEngine 2.0 and the future of public policy analysis
Discover PolicyEngine's Latest Innovations in Evidence-Based Policy Analysis.
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PolicyEngine UK @uk.policyengine.org · 10/09/2025
How would changing the VAT threshold from £90k affect revenues? Our new firm microsimulation model shows: • £70k threshold: +£640m revenue • £100k threshold: -£370m revenue • £120k threshold: -£1.1bn revenue All estimates for 2026-27.
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PolicyEngine US @us.policyengine.org · 05/09/2025
🤝 Big news: PolicyEngine and @nber.org have signed an MOU to ensure researchers worldwide continue accessing critical tax microsimulation tools. We're building an open-source TAXSIM emulator, combining NBER's 50+ years of tax expertise with modern open-source infrastructure.
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PolicyEngine US @us.policyengine.org · 22/08/2025
🎉 PolicyEngine has been awarded a $300,000 Phase I POSE grant from NSF (Award No. 2518372) to expand our open-source platform, build sustainable governance, and grow our contributor community! policyengine.org/us/research/nsf-po…
policyengine.org
National Science Foundation awards PolicyEngine $300,000 grant | PolicyEngine US
NSF's Pathways to Enable Open-Source Ecosystems program will support PolicyEngine's work to expand access to policy analysis tools.
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PolicyEngine @policyengine.org · 22/04/2025
How do energy policies like carbon taxes, LIHEAP, or EV credits impact households? We recap PolicyEngine's open-source tools for analyzing these effects in the US & UK. Learn more in our latest post, featuring insights from the Open Sustainability Policy Summit: policyengine.org/us/research/...
policyengine.org
Analyzing Energy Policy with PolicyEngine | PolicyEngine US
We provide an Earth Day recap of our capabilities in the US and UK.
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Max Ghenis @maxghenis.bsky.social · 26/02/2025
Just back from EA Global SF with the @policyengine.org team! Incredible conversations with folks tackling the world's most pressing problems. With AI transforming society at unprecedented speed, our work on transparent policy simulation feels more urgent than ever.
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Brian Galle @bdgesq.bsky.social · 12/01/2025
A fun new tool from @maxghenis.bsky.social : a calculator for charitable contributions, including both state and federal effects and interactions with other deductions. Lots of other good bells and whistles. @nicduquette.bsky.social should be into this. policyengine.org/us/research/...
policyengine.org
Introducing GiveCalc | PolicyEngine US
Calculate the true cost of charitable giving.
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PolicyEngine @policyengine.org · 10/01/2025
🎉 Our CEO @maxghenis.bsky.social joined the Free Equitism podcast to discuss how PolicyEngine's microsimulation tools compute economic policy impacts. Watch the full discussion here or on your favorite podcast platform: youtu.be/XWZA_mzxDXw?...
youtu.be
3. max ghenis - 2025.1.8
YouTube video by free equitism
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PolicyEngine @policyengine.org · 28/12/2024
🆕 PolicyEngine now supports behavio(u)ral responses in both the US and UK! Choose default elasticities around how much policy affects work hours, or set your own.
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PolicyEngine UK @uk.policyengine.org · 26/12/2024
Making benefit calculations crystal clear for everyone. See how our AI-powered explanations help you understand your Universal Credit, National Insurance Contributions, and more. policyengine.org/uk/research/...
policyengine.org
New AI feature helps people understand their taxes and benefits | PolicyEngine UK
We’re applying large language models to clarify complex policy rules.
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PolicyEngine @policyengine.org · 24/12/2024
The OECD's new report highlights how governments are translating regulations into executable code to make public services more consistent, transparent and efficient. This is exactly why we're building PolicyEngine! Read more: www.oecd.org/en/publicati...
oecd.org
Global Trends in Government Innovation 2024
Governments worldwide are transforming public services through innovative approaches that place people at the center of design and delivery. This report analyses nearly 800 case studies from 83 countr...
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Max Ghenis @maxghenis.bsky.social · 23/11/2024
Great to see @pn3policy.bsky.social continuing to expand the breadth and depth of their Policy Impact Calculator here at APPAM! Among their many sources are tax calculations from @policyengineus.bsky.social.
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PolicyEngine UK @uk.policyengine.org · 20/11/2024
At 2:00 pm GMT on November 25th @nikhilwoodruff.bsky.social and Vahid Ahmadi will review our analyses of Autumn Budget reforms, and also preview breakdowns by constituency which we'll launch in the coming months Register here: us06web.zoom.us/meeting/regi...
us06web.zoom.us
Welcome! You are invited to join a meeting: PolicyEngine UK Training - Autumn Budget Review Edition. After registering, you will receive a confirmation email about joining the meeting.
Join the PolicyEngine team for our monthly interactive training session on how to use the open source software platform to simulate tax and benefit reforms right from your browser. For the November s...
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