The Facts on Interstate Migration: Part Five

May 16, 2014

This is day 5 of our week-long series discussing taxes and migration, and responding to the Center on Budget and Policy Priorities’ Michael Mazerov’s new paper on the topic. Read part 1 here, part 2 here, part 3 here, and part 4 here.

In a long series of tables and state-to-state comparisons, Mazerov lays out an argument that the migration flows between high-tax states and low-tax states are, contrary to public perception, actually quite similar. For example, he cites that 68.3 percent of the households moving out of New York will be replaced by households moving in, and offers a similar statistic for other states with net outward migration.

Unfortunately, he doesn’t provide the data for states with net inward migration. He also doesn’t provide information on how much income migrates; and in fact doesn’t even show the actual population changes, just the number of “households,” which may vary in size. These omissions are particularly odd as, in the paragraph right above the incomplete chart, he says it’s important to look at “all of the available migration data” (emphasis Mazerov’s). This could lead to readers getting the wrong idea that differences among state migration patterns are small. In fact, that is exactly what Mazerov does claim, when he says “As it turns out, net migration in most states is indeed quite small compared with total or gross migration” (emphasis Mazerov’s).

We provide the full data for the period 1993-2011 below:

Table 1. Differences in Net Migration, 1992-2011
Share of Departing Households Replaced by New Arrivals Share of Departing Population Replaced by New Arrivals Share of Departing Income Replaced by Arriving Income
New York 68.3% 60.5% 59.9%
California 83.0% 73.2% 79.5%
Illinois 79.4% 76.2% 71.3%
Michigan 73.5% 77.8% 71.7%
District of Columbia 94.0% 80.9% 83.1%
New Jersey 80.6% 81.7% 78.5%
Massachusetts 86.1% 81.7% 82.7%
Louisiana 84.4% 83.4% 78.9%
Rhode Island 85.0% 83.8% 84.6%
Ohio 80.2% 84.3% 74.6%
Connecticut 82.1% 84.7% 85.1%
Hawaii 92.6% 86.0% 95.0%
North Dakota 88.1% 87.2% 81.4%
Alaska 95.9% 92.2% 83.6%
Nebraska 89.4% 92.7% 83.4%
Kansas 91.5% 93.8% 88.3%
Iowa 87.3% 94.0% 83.3%
Pennsylvania 88.4% 94.4% 89.3%
Maryland 97.3% 95.9% 88.3%
Minnesota 96.0% 99.0% 88.0%
Vermont 96.0% 100.0% 112.4%
Indiana 94.4% 100.0% 90.2%
South Dakota 97.5% 100.5% 110.1%
Wisconsin 93.0% 100.9% 92.7%
Mississippi 98.7% 101.1% 103.1%
Utah 103.8% 102.4% 107.6%
Wyoming 100.3% 102.9% 121.5%
New Mexico 103.8% 103.3% 106.7%
West Virginia 98.0% 104.1% 98.0%
Oklahoma 101.5% 104.3% 95.8%
Missouri 102.5% 105.3% 95.6%
Virginia 106.4% 105.6% 101.6%
Maine 100.1% 106.4% 116.2%
Kentucky 106.0% 108.4% 102.7%
Alabama 104.6% 108.5% 107.4%
New Hampshire 104.5% 110.3% 119.8%
Montana 106.4% 110.4% 130.2%
Washington 113.4% 112.6% 120.6%
Arkansas 109.7% 113.1% 116.0%
Delaware 115.7% 115.6% 109.7%
Oregon 119.2% 117.7% 122.7%
Colorado 120.1% 118.0% 126.3%
Texas 117.2% 119.6% 118.7%
Tennessee 118.4% 119.9% 122.0%
Idaho 116.5% 121.3% 133.6%
South Carolina 121.4% 123.0% 144.8%
Georgia 123.5% 124.0% 118.5%
Florida 127.1% 127.3% 169.6%
North Carolina 127.5% 127.6% 137.0%
Arizona 136.6% 135.1% 154.4%
Nevada 140.5% 140.1% 165.1%

The differences between states are also made clear when this data is presented in map format, which shows the states that are clear outliers in terms of net inward or outward migration rates.

(click map to enlarge)

As can be seen, and as I explained in my earlier post about the actual scale of migration, net migration varies widely. For every 2 people who leave New York, only about 1 moves in. Outward migration is almost double inward migration. On the other hand, in Nevada, for every 2 people who leave the state, about 3 move in. These aren’t “quite small” values. These are demographically significant changes amounting to literally millions of people.

But Mazerov has a point when he says that for most states, net migration is small. The specific values I mention are extremes. But for policymakers, the essential question is: what makes a state an extreme?

Consider the 4 states and the District of Columbia that have the largest net outflows of people: New York, California, Illinois, Michigan, and DC. They don’t share many climatological features. California has arguably the best climate in the nation. DC is hardly a frozen tundra. Illinois, New York, and Michigan can get cold, but New York City is not cold in the same way that Chicago is. Climate, then, doesn’t seem like a good explanation for these outliers.

Maybe anemic job growth explains these states’ problems. But even that seems difficult to justify, because the 1990s saw strong job growth in California, and the late 90s and 2000s also saw a revitalization of New York City. Michigan was suffering through the decline of Detroit, but Chicago has not seen a similar decline. The DC metro area, meanwhile, has an extremely robust job market.

Is quality of life terrible in Los Angeles, Chicago, San Francisco, New York City, and Washington? That hardly seems plausible.

So what motivates these exceptional patterns of outmigration? No doubt many things. Many of these states share a high cost of living along many categories, especially housing, as Mazerov notes. But one variable we suggest would be, obviously, taxes.

Our State-Local Tax Burdens report has back-cast statewide tax burdens to 1977, thus can be a useful tool for seeing if these states actually had high taxes historically. A quick check reveals that all of these exceptional out-migration states have generally had higher-than-average tax burdens. Michigan and Illinois are nearest the national average, while the District of Columbia has quite recently fallen below it. But certainly none of them could claim to be low-tax jurisdictions. So high taxes seem like a reasonable candidate for one factor that can motivate out-migration.

What about exceptional states on the high end? Since we assessed all the states with less than 80 percent replacement of out-migrants, it makes sense to look at the states that have over 120 percent replacement.

Most of those states are southern or southwestern states, so climate may matter. Idaho is the only climate outlier. Job growth probably matters as well, as many of those states have seen strong growth in the last 20 years (though, again, job growth itself may be affected by taxes).

On the whole, these high-inward migration states tend to have lower tax burdens. North Carolina and Idaho have periodically had higher than average tax burdens, but most, like Tennessee and Nevada, have consistently low tax burdens. Again, this doesn’t conclusively prove that taxes drive migration, as no doubt other living costs are lower in these states too: but it does suggest that taxes cannot be discounted out of hand.

In sum, we can’t conclusively say that lowering taxes will suddenly attract a tide of migrants. The connection between taxation and migration suggests that taxes affect migration on the margin, mostly impacting it through supporting economic growth and motivating upwardly mobile individuals. State policymakers are right to be concerned about migration in relation to taxes. But they should be careful to clearly explain that the main economic effect of better tax policy isn’t directly on migration, but on broader economic growth. Net inward migration is a positive side effect of economic growth and better tax policy (insofar as tax policy promotes growth), and shouldn’t be the fundamental goal of tax changes.

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