IRS and Census data show that people and businesses favor states with low and structurally sound tax systems

How Do Taxes Affect Interstate Migration by Katherine Loughead of The Tax Foundation. Excerpts:

"Every year, millions of Americans pack up and move from one state to another, providing unique insights into what people value when deciding where to live, work, and raise a family. For many years, policymakers, journalists, and taxpayers have debated the role state tax policy plays in individuals’ and businesses’ location decisions. Annual data about who is moving—and where—provide clues about the factors contributing to these moves.

Taxes are one such factor. The latest IRS and Census data show that people and businesses favor states with low and structurally sound tax systems, which can impact the state’s economic growth and governmental coffers."

"Many factors influence an individual’s or family’s decision to move from one state to another—employment or educational opportunities, proximity to family or friends, and geographic and lifestyle preferences like weather, natural landscape, and population density, to name a few. Cost-of-living considerations, including tax differentials, may not be the primary reason for an interstate move, but they are often one of several factors people consider when deciding whether—and where—to move.

With this in mind, one observation from the 2019-2020 IRS migration data is that a strong positive relationship exists between state tax competitiveness and inbound migration. Overall, states with lower taxes and sound tax structures experienced stronger inbound migration than states with higher taxes and more burdensome structures.

Of the 10 states that experienced the largest gains in income taxpayers, five do not levy individual income taxes on wage or salary income at all, and two others had top marginal individual income tax rates that were below the national median at the time. Recently, those states have grown even more competitive. Nine of the top 10 states either forgo individual income taxes on wage and salary income, have a flat income tax, or are moving to a flat income tax.

Additionally, among the 28 states that experienced net inbound migration of income tax filers, only nine had a top marginal individual income tax rate above the national median. Meanwhile, among the 22 states (and the District of Columbia) that experienced net outbound migration of income tax filers, 15 states and D.C. had top marginal rates above the median. In the aggregate, states with a top marginal rate at or below the 2019 median of 5.4 percent gained 225,000 net new residents from the states with rates above the median.

A robust positive relationship also exists between states with below-average state and local tax collections per capita and those experiencing strong inbound migration. Of the 28 states that saw a net gain in income tax filers due to interstate migration, 22 had below-average state and local tax collections per capita in fiscal year 2020, while half of the states that experienced net outbound migration had above-average collections per capita.

Furthermore, a strong positive relationship exists between states with well-structured tax codes and those that experience net inbound migration. Among the 25 best ranking states on the 2020 State Business Tax Climate Index, which had a snapshot date of July 1, 2019, 20 states experienced net inbound migration between 2019 and 2020. Meanwhile, among the 25 worst ranking states on the Index, 17 experienced a net loss of taxpayers to interstate migration."

"The IRS data also show interstate migration broken down by AGI level. Among taxpayers with $200,000 or more in AGI, the top destinations for inbound interstate moves were Florida, Texas, Arizona, North Carolina, and South Carolina. Meanwhile, the states that saw the largest losses of taxpayers with $200,000 or more in AGI were New York, California, Illinois, Massachusetts, and Virginia. Several of the states losing higher-income taxpayers, especially New York, California, and New Jersey, have highly progressive tax codes under which tax liability rises steeply with income. States that structure their tax codes in this manner have consistently lost higher-income residents to lower-tax states, and not only the residents, but also any associated tax revenue and entrepreneurial activity that goes along with them."