iiinova — where your digital self keeps evolving

PolicyEngine US @us.policyengine.org · 23/09/2026

PolicyBench has a new #1: GPT-6 Sol gets 94.2% of tax and benefit answers within $1 with no tools, ending GPT-5.6 Sol's run at the top since July. Claude Opus 5.5 enters second at 92.9%, GPT-6 Luna fourth at 91.4%. policybench.org/notes/2026-09-22-gpt-6-sol-debuts-first

Bar chart of the top 10 of 42 models on PolicyBench (September 22 board), by share of tax and benefit answers within $1 of PolicyEngine's reference, weighted by household impact, no tools: GPT-6 Sol 94.2%, Claude Opus 5.5 92.9%, GPT-5.6 Sol 92.7%, GPT-6 Luna 91.4%, GPT-6 Astra 91.1%, Claude Fable 5.1 90.2%, Kimi K3 89.9%, GPT-5.6 Luna 88.5%, Inkling 87.9%, GLM-5.3-Flash (preview) 87.8%. GPT-6 Sol, Claude Opus 5.5 and GPT-6 Luna are new.

000

PolicyEngine US @us.policyengine.org · 15/09/2026

Configure a reform: a state Child Tax Credit, EITC, dependent exemption, child allowance, and more to see its impact on child poverty, individual households, income distribution, and congressional districts.

110

PolicyEngine US @us.policyengine.org · 15/09/2026

This morning, the Census announced that the SPM child poverty rate was 13.4% in 2025, down 0.1 pp from 2024. Today we're launching the Child Poverty Impact Dashboard: a tool to analyze how reforms can affect this rate across all 50 states and DC. www.policyengine.org/us/child-pov...

111

PolicyEngine US @us.policyengine.org · 15/09/2026

SPM thresholds move with consumer spending, not CPI: renters' rose 6.3% in 2025. New from PolicyEngine: a threshold calculator for any metro or state, 2022–2035, every input hashed and reproducible in Python, plus a paper that rebuilds BLS's thresholds from public data to within 3%, most within 2%.

110

PolicyEngine US @us.policyengine.org · 04/09/2026

What would a state Child Tax Credit, an expanded EITC, or a child allowance do to child poverty in your state? The dashboard answers in minutes, for all 50 states and DC, down to the congressional district.

110

PolicyEngine US @us.policyengine.org · 04/09/2026

New poverty numbers land the morning of Tuesday, September 15. That afternoon at 2pm ET, join us for guest remarks on the release and a live demo of PolicyEngine's new Child Poverty Impact Dashboard. Register: us06web.zoom.us/meeting/regi...

111

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

011

PolicyEngine US @us.policyengine.org · 04/08/2026

Governor Greg Gianforte proposes a flat income tax in Montana, lowering the state’s top marginal rate from 5.4% to 4.7% in 2028. We project the proposal would: *Cost $118 million *Benefit 21.8% of Montana’s residents *Direct 87% of the savings to tax units above $200k

020

PolicyEngine US @us.policyengine.org · 22/07/2026

Google Deepmind shipped Gemini 3.6 Flash yesterday, and we've added it to PolicyBench. #8 of 26 — 79.0% of US tax and benefit amounts within $1: the best Gemini on the board, ahead of 3.1 Pro, +2.8 over 3.5 Flash. policybench.org

000

PolicyEngine US @us.policyengine.org · 21/07/2026

. @ginafortexas.bsky.social, Democratic nominee for Texas Governor, proposes a $1,500 rebate for every household. We project that in 2027, the proposal would: *Cost $17.7 billion *Direct 42% of the benefit to households under $50k *Lower the state's poverty rate by 6.8%

010

PolicyEngine US @us.policyengine.org · 19/07/2026

Kimi K3 debuts #2 of 25 on PolicyBench — the first open-weight model to crack the top ten. 86.2% of US tax and benefit amounts within $1, no tools, +21.6 points over Kimi K2.6: the biggest version jump we've measured.

100

PolicyEngine US @us.policyengine.org · 15/07/2026

You can view the impact of this enacted CTC increase on our NJ CTC Calculator and see how it would affect your household, the state, and each NJ congressional district. www.policyengine.org/us/nj-ctc-in...

policyengine.org

NJ Child Tax Credit increase calculator

Interactive analysis of New Jersey's enacted 25% Child Tax Credit increase for tax years 2026-2028 (S-4531 / P.L.2026, c.26).

010

PolicyEngine US @us.policyengine.org · 15/07/2026

In 2026, we project the CTC increase will: *Cost $55 million *Benefit 242,000 tax units and 1.0 million residents *Deliver an average benefit of $304 to filers with $30,000 or less in taxable income.

110

PolicyEngine US @us.policyengine.org · 15/07/2026

As part of the FY2027 budget, New Jersey enacted S-4531, which raises the state CTC amount by 25% for three years. Families with taxable income below $80,000 can claim a credit for each child under age 6. Using our NJ CTC calculator, we analyzed the impact of this increase.

111

PolicyEngine US @us.policyengine.org · 11/07/2026

xAI's Grok 4.5 joins PolicyBench, our benchmark of how accurately AI computes US taxes and benefits (no tools, scored against PolicyEngine): #5 of 24 — 80.9% of answers within $1 +3.7 points over Grok 4.3 (#9) policybench.org

000

PolicyEngine US @us.policyengine.org · 09/07/2026

GPT-5.6 joins PolicyBench, our benchmark of how accurately AI computes US taxes and benefits (no tools, scored against PolicyEngine): Sol #1 of 23 — 88.7% within $1 (prior best 83.5%) Luna #2 — 84.5% Terra #4 — 83.4% policybench.org

010

PolicyEngine US @us.policyengine.org · 07/07/2026

See the full benchmark: policybench.org

000

PolicyEngine US @us.policyengine.org · 07/07/2026

PolicyBench now scores 20 AI models on how accurately they compute US taxes and benefits — adding Claude Fable 5, Claude Sonnet 5, and five open-weight models: DeepSeek, Qwen, GLM, MiniMax, and Kimi. GPT-5.5 leads, Fable ranks #2, and DeepSeek v4-pro tops the open-weight models.

210

PolicyEngine US @us.policyengine.org · 05/07/2026

Federalist No. 62 warned that every new revenue law "presents a new harvest to those who watch the change, and can trace its consequences." 250 years after independence, we build free, open-source software so everyone can trace the consequences. policyengine.org

000

PolicyEngine US @us.policyengine.org · 19/06/2026

In 2027, we project the CTC will: - Cost $45 million - Benefit 79,000 households - Lower child poverty and deep child poverty by 3.5% and 8.4%, respectively

110

PolicyEngine US @us.policyengine.org · 19/06/2026

Last week, @govdanmckee.bsky.social signed the Rhode Island Fiscal Year 2027 budget, which includes a new refundable Child Tax Credit. Beginning in 2027, taxpayers can claim $330 for each child under the age of 19. Using our RI CTC calculator, we analyzed the impact of this program.

111

PolicyEngine US @us.policyengine.org · 18/06/2026

The Bureau of Economic Analysis — the federal agency behind GDP — used PolicyEngine to calculate the taxes in its latest Distribution of Personal Income statistics. The first BEA release built on our open-source model. www.bea.gov/data/special...

bea.gov

Distribution of Personal Income | U.S. Bureau of Economic Analysis (BEA)

Distribution of Personal Income Distribution of personal income statistics take one of BEA's primary economic indicators – personal income – and measure how it is distributed across households nationa...

020

PolicyEngine US @us.policyengine.org · 17/06/2026

Can a language model compute a household’s taxes and benefits from the prompt alone — no tools? We tested 13 frontier models against PolicyEngine on 100 representative US households. New benchmark: PolicyBench. policybench.org

100

PolicyEngine US @us.policyengine.org · 27/05/2026

Earn a dollar more, take home less. Benefit cliffs happen when a household loses more in benefits than it gains in earnings. CliffWatch shows where, when, and how — across earnings levels and US states. Live demo Fri May 29, 1pm ET → us06web.zoom.us/meeting/regi...

000

PolicyEngine US @us.policyengine.org · 04/05/2026

PolicyEngine at the Code for America Summit this week. Thu 2pm — @daphnehansell.bsky.social on Coverage Compass: how life events change health coverage. Fri 2pm — @maxghenis.bsky.social moderating a panel with three orgs using PolicyEngine to calculate eligibility and amounts. Say hi in Chicago.

020

PolicyEngine US @us.policyengine.org · 04/05/2026

New UHERO analysis uses PolicyEngine to simulate Hawaii's childcare credit bills — first the direct household effect of the expanded CDCC, then the integrated CDCC, EITC, SNAP, WIC, and state income tax impact when a second earner enters the workforce in response.

100

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.

131

PolicyEngine US @us.policyengine.org · 15/04/2026

We were also cited in Rep. McDonald Rivet’s press release of the bill: mcdonaldrivet.house.gov/media/press-...

000

PolicyEngine US @us.policyengine.org · 15/04/2026

Use our calculator below to explore the effect on your household, more nationwide impacts, and how each congressional district would benefit from the WPTRA: www.policyengine.org/us/working-p...

policyengine.org

Working Parents Tax Relief Act Calculator

Calculate your personal and national tax impact under the Working Parents Tax Relief Act. See how the proposed EITC enhancement for parents of young children affects your household.

110

PolicyEngine US @us.policyengine.org · 15/04/2026

We project the bill would: - Lower federal revenues by $184.1B over 10 years - Benefit 2.9% of households and reduce child poverty by 1.4% in 2026

110

PolicyEngine US @us.policyengine.org · 15/04/2026

NEW INTERACTIVE: Rep. Kristen McDonald Rivet has released the Working Parents Tax Relief Act (WPTRA), which increases the maximum EITC benefit by $5,500 for each child under 4 in a tax unit.

120

PolicyEngine US @us.policyengine.org · 06/04/2026

The Living Wage Institute has adopted PolicyEngine for the tax calculations behind their living wage data. Read how our model is improving the accuracy of their household tax estimates — from iterative income solving to local tax coverage. www.livingwage.institute/post/how-we-...

livingwage.institute

How We're Improving Tax Calculations in Partnership With PolicyEngine

To ensure our data better reflects on-the-ground economic realities, the Living Wage Institute has partnered with PolicyEngine to enhance how we calculate household tax obligations. This partnership r...

010

PolicyEngine US @us.policyengine.org · 03/04/2026

How much would California's billionaire wealth tax actually raise? It depends on your assumptions about avoidance, departures, and income tax loss. We built an interactive calculator that lets you explore the tradeoffs — with presets calibrated to existing papers.

110

Reposted by PolicyEngine US

PolicyEngine @policyengine.org · 01/04/2026

Introducing the PE-84. The world's first graphing microsimulator. Pre-order now: policyengine.org/pe84

121

PolicyEngine US @us.policyengine.org · 25/03/2026

We updated the State Legislative Tracker: You can now track tax bills across all 50 states, see each bill's legislative stage, follow real-time activity, and jump to full PolicyEngine analysis. Try it at policyengine.org/us/state-legislative-tracker

011

PolicyEngine US @us.policyengine.org · 24/03/2026

Key features of our TANF calculator include: - State-specific estimates - Income & benefits chart - Interactive heatmap - State rankings - Scenario analysis Try it out: policyengine.org/us/tanf-calculator

policyengine.org

PolicyEngine

Free, open-source tools to understand tax and benefit policies. Explore research, meet our team, and learn about policy impacts.

000

PolicyEngine US @us.policyengine.org · 24/03/2026

With our new calculator for the Temporary Assistance for Needy Families (TANF) cash assistance program, you can estimate TANF eligibility and benefit amounts for any household across all 50 states and DC.

100