PolicyEngine

Free, open-source tax and benefit analysis. Model policy reforms across the UK.

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Trusted by researchers and policy organisations

National Institute of Economic and Social Research

Explore our latest research and tools

Spring Statement 2026 analysis

New OBR forecast and its effects on UK living standards

Two-child limit reintroduction

Budgetary, distributional, poverty, and inequality impacts across the UK

Salary sacrifice cap analysis tool

Revenue and distributional impacts of capping pension salary sacrifice

Student loan deductions calculator

Repayments, marginal tax rates, and lifetime costs for UK graduates

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Expert policy analysis

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Oct 12, 2026

Scrapping the childcare cliff edge

Estimate the cost of removing the £100,000 income limit on the 30 funded hours and Tax-Free Childcare, who gains, and how a family's income changes at the cliff, modelled with PolicyEngine UK.

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Oct 12, 2026

PolicyEngine's microsimulation package published in the Journal of Open Source Software

The peer-reviewed paper describing policyengine, the open-source Python package for UK and US tax-benefit microsimulation that powers PolicyEngine, is now published in JOSS.

Oct 5, 2026

Targeted energy bill discount analysis dashboard

Estimate the cost, reach and distributional effects of the Resolution Foundation's proposed targeted energy bill discount, modelled with PolicyEngine UK.

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Sep 25, 2026

Impact of the Middle East war on UK living standards

Estimate how energy, fuel and food price rises from the Middle East conflict and Strait of Hormuz disruption affect UK households in 2027-28, and compare ten policy responses, modelled with PolicyEngine UK.

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Sep 11, 2026

Marriage calculator

Compare a couple's taxes and benefits when living together against living in separate households, modelled with PolicyEngine UK.

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