Estimating Income and Payroll Tax Rates for SAGE · 2020. 4. 24. · for SAGE WiNDC April 2020...
Transcript of Estimating Income and Payroll Tax Rates for SAGE · 2020. 4. 24. · for SAGE WiNDC April 2020...
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICS
Estimating Income and Payroll Tax Ratesfor SAGE
WiNDC April 2020 Meeting
04/24/2020
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Outline
1. SAGE Model Overview
2. Why tax rates matter?
3. Effective Marginal Tax Rate Estimates
4. Marginal Tax Rates and Incidence Analysis
5. Ongoing Development
The views expressed in this presentation are those of the author(s) and do not necessarily represent
the views or policies of the EPA
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
SAGE Model
I SAGE is an Applied General Equilibrium model of the U.S.
I Dynamic model with nine regional representations and fiverepresentative households in each region based on income
I Developed by EPA/NCEE to improve our capabilities toestimate the economic impacts of environmental regulations
I Focus on estimating social costs, but could provide informationon incidence and other impacts of concern
https://www.epa.gov/environmental-economics/cge-modeling-regulatory-analysis
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Estimating Regulatory Costs: Tax Interaction Effect
Adapted from Marten, Garbaccio, and Wolverton (JAERE, 2019)
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
First Stage of Tax Calibration Work
I Initial focus on:
I Individual incometaxes
I Payroll taxes
I 2/3 of federal andstate revenue
I Capture differencesacross regions andhousehold incomes
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Estimating Effective Marginal Tax Rates
I Process for estimating effective marginal tax rates
1. Create a sample of individual tax returns from the CurrentPopulation Survey (CPS) Annual Social and EconomicSupplement (ASEC)
2. Run NBER’s TAXSIM model with the sample returns toestimate effective marginal tax rates for each filer in the sample
3. For each region and household, calculate source specificincome (and survey) weighted effective marginal tax rates for:
I Wage income (state + federal)
I FICA payroll taxes (federal)
I Investment income types (state + federal)
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Effective Marginal Tax Rates on Wage Income
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Marginal vs. Avgerage Tax Rates
I Marginal tax rates are important for defining incentives
I Straightforward implementation of marginal tax rates leads tomodeled transfers that are notably larger than in practice
I Model needs to “refund” households taxes collected in excessof the average rate
I In the U.S., over 90% of transfer payments are indexed forinflation (Fullerton et al., 2011)
I In SAGE, all transfers are indexed to the CPI
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Indexing of Tax “Refunds”
I Repricing labor income from the wage rate to the CPI throughthe refund process can impact the incidence estimates forregulatory costs
I Effect on aggregate welfare is small due to government closure
I Need to ensure excess taxes paid by using the marginal taxrate are “refunded“ at the appropriate wage rate
I With EITC refunded closer to CPI to more closely match reality
I Repeat CPS/TAXSIM procedure to estimate region-householdspecific average tax rates to identify the tax “refund”
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Marginal vs. Average Tax Rates on Wage Income
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Effect of Average Tax Adjustment on Incidence
I Effect on costincidence fromrefunding taxoverpayments atwage rate vs. CPI
I Stylized version ofClean Air Actthrough 2011
I Non-trivial differencefor incidence in manycases
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Ongoing Development: Adjusting the Tax Base
I SAM has totalcompensation
I Taxable base is lowerthan total compensation
I Taxable base differsacross taxes
I Adjustments based onnational average is easy
I Addressing benefitheterogenity acrossincomes is challenging
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NCEENATIONAL CENTER FORENVIRONMENTAL ECONOMICSNCEE
Ongoing Development: Other Taxes
I Corporate tax rateI Effective rate pre
TCJA: 19% (CBO)I TCJA rate: 21% +
other changes
I Disaggregating“production” taxesI WiNDC improves
customs dutiesI Working on
regional sales,excise, andproperty tax rates
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