We provide free, open source software to compute the impact of public policy. See our global account @ThePolicyEngine and US account @PolicyEngineUS.
United Kingdom
Joined January 2023
- Tweets318
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Five years ago today PolicyEngine launched in the UK to democratize evidence-based policy, so that anyone can change a tax or benefit rule and see what it means for their household and the country.
Thank you to everyone who has built it with us, and to everyone who uses it.
PolicyEngine UK retweeted
We're at the International Microsimulation Association World Congress in Brussels, 1–3 July. Three talks:
• Maria Juaristi — local microdata calibration with L0 regularisation
• @vahiidahmadi — firm microsimulation + VAT
• @MaxGhenis — hands-on PolicyEngine tutorial
New peer-reviewed, open-access paper: PolicyEngine microsimulation helped 39 UK citizens deliberate real fiscal-policy trade-offs during the cost-of-living crisis — a method later adopted by the UK Climate Change Committee. doi.org/10.1016/j.socimp.202…
PolicyEngine UK retweeted
@MaxGhenis and @ThePolicyEngine team have integrated frontier agentic AI into the most expansive open source microsimulation model of US fiscal policy. AI allows easier use and access as well as automates much of the model creation and maintenance.
youtu.be/Ke_J3pOdL8k?si=in6Q…
We just launched a plugin that brings PolicyEngine to @claudeai.
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-p…
PolicyEngine UK retweeted
Can the government solve the student loan crisis in England and Wales? 💷
And does the system work better in Scotland? 🏴
Watch our analysis featuring new modelling from @PolicyEngineUK and let us know what you think should be done👇
#Peston
Happy Valentine's Day! We just launched PolicyEngine's marriage calculator.
Find out if saying "I do" means a bonus or penalty for your household — from the marriage allowance to Universal Credit.
Try it: policyengine.org/uk/marriage
PolicyEngine UK retweeted
Join our webinar today at 1:30PM ET to learn more!
us06web.zoom.us/meeting/regi…
Our new dashboard analyses the Scottish Budget 2026-27:
📊 £64m cost in 2026-27 → £196m revenue by 2030-31
📈 Threshold uplifts, SCP expansion, rate freezes
🏠 Household calculator to see your impact
Explore: policyengine.org/uk/scottish…
PolicyEngine UK retweeted
1/3 Excited to share this! For the past 6 months I've been working with the powerhouse No 10 Data Science team @10DowningStreet to push the speed and accuracy boundaries of tax-benefit policy analysis with @ThePolicyEngine 's open source technology.
PolicyEngine is now powering rapid policy analysis at 10 Downing Street.
Our co-founder and CTO @nikhil_woodruff spent 6 months with the 10DS data science team as an Innovation Fellow, adapting our open-source microsimulation model for government use.
ALT Social media graphic with dark blue background. Headline reads "PolicyEngine powers 10 Downing Street" with "10 Downing Street" in teal. Subtext: "Our open-source microsimulation technology is now supporting rapid policy analysis at the UK Prime Minister's office." Features a circular headshot of Nikhil Woodruff alongside his quote: "PolicyEngine has made it possible to answer critical questions at the speed policy debates unfold." PolicyEngine logo in bottom left.
PolicyEngine is now powering rapid policy analysis at 10 Downing Street.
Our co-founder and CTO @nikhil_woodruff spent 6 months with the 10DS data science team as an Innovation Fellow, adapting our open-source microsimulation model for government use.
ALT Social media graphic with dark blue background. Headline reads "PolicyEngine powers 10 Downing Street" with "10 Downing Street" in teal. Subtext: "Our open-source microsimulation technology is now supporting rapid policy analysis at the UK Prime Minister's office." Features a circular headshot of Nikhil Woodruff alongside his quote: "PolicyEngine has made it possible to answer critical questions at the speed policy debates unfold." PolicyEngine logo in bottom left.
Read Nikhil's article: fellows.ai.gov.uk/articles/n…
And more on our blog: policyengine.org/uk/research…
2025 was a landmark year for PolicyEngine UK.
1,010 local areas modelled
38 reports & trainings published
9 Autumn Budget provisions analysed
From the Local Areas Dashboard to GiveCalc UK—here's what we accomplished.
Explore our interactive year in review: policyengine.org/uk/2025-yea…
Our complete analysis of the UK Autumn Budget 2025 is now live.
New interactive dashboard lets you explore how all 9 provisions interact—by income decile, constituency, and year through 2030-31.
Explore: policyengine.org/uk/autumn-b…
Launching GiveCalc for UK taxpayers 🇬🇧
Calculate your Gift Aid tax relief in seconds. Enter your income and donation — see exactly how much you save.
✓ Higher rate relief (40%/45%)
✓ Scottish income tax rates
✓ Personal Allowance taper effects
The UK's first rail fare freeze in 30 years will cost £145m in 2026-27, rising to £775m cumulative by 2030-31.
Read our new report for more on the revenue and distributional implications: policyengine.org/uk/research…
NEW: How will the £2,000 cap on salary sacrifice pension contributions affect UK workers?
We modelled four behavioural scenarios to show how revenue and distributional impacts vary.
Revenue and distributional impacts vary by behavioural assumptions. Interactive charts let you explore all scenarios.
See our full analysis for more: policyengine.org/uk/research…
