BREAKING: PolicyEngine's microsimulation model projects a surge in candy consumption in the coming hours.

Happy Halloween! 🎃

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/...

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/...

📍 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...

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.

🤝 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.

🎉 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! https://policyengine.org/us/research/nsf-pose-phase-1-grant

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/...

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.

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/...

🎉 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?...

🆕 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.

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/...

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...