PolicyEngine UK

We provide free, open source software to compute the impact of public policy. See our global account @ThePolicyEngine and US account @PolicyEngineUS.

[Rick Evans @RickEcon]

@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.
https://t.co/QCnXtVEMsz

[PolicyEngine UK @PolicyEngineUK]

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.

https://t.co/B9uvCqUXWB

[Peston @itvpeston]

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

[PolicyEngine UK @PolicyEngineUK]

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: https://t.co/LfERdG2gps

[PolicyEngine @ThePolicyEngine]

Join our webinar today at 1:30PM ET to learn more!

https://t.co/bwq62CfUq4

[PolicyEngine @ThePolicyEngine]

https://t.co/j3ufyGAeFu

[PolicyEngine UK @PolicyEngineUK]

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: https://t.co/Wq1js4ZKy3

[Nikhil Woodruff @nikhil_woodruff]

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 UK @PolicyEngineUK]

Read Nikhil's article: https://t.co/4tZPFy9ZGP

And more on our blog: https://t.co/WZffGx351L

[PolicyEngine UK @PolicyEngineUK]

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.

[PolicyEngine UK @PolicyEngineUK]

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: https://t.co/tZSFh2muwh

[PolicyEngine UK @PolicyEngineUK]

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: https://t.co/NU0LPrP4dR

[PolicyEngine UK @PolicyEngineUK]

Free at https://t.co/CfFqJYFS0q

(By the way, PolicyEngine is a registered charity)

[PolicyEngine UK @PolicyEngineUK]

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

[PolicyEngine UK @PolicyEngineUK]

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: https://t.co/OnaRMGsDyg

[PolicyEngine UK @PolicyEngineUK]

See our full analysis for more: https://t.co/tfEVp2ThOO

[PolicyEngine UK @PolicyEngineUK]

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.

[PolicyEngine UK @PolicyEngineUK]

Revenue and distributional impacts vary by behavioural assumptions. Interactive charts let you explore all scenarios.

[PolicyEngine UK @PolicyEngineUK]

The new high value council tax surcharge will raise £400m/year from £2m+ properties.

Top 10 constituencies = 35% of revenue. Cities of London & Westminster alone: 10%.

Explore our latest Autumn Budget analysis and interactive: https://t.co/yCYEq1jQ7U