1. Taxes and Interstate Migration
New Jersey Department of the Treasury
Office of the Chief Economist
Office of Revenue and Economic Analysis

2. The New Jersey Tax Flight Controversy
In 2004 New Jersey sharply increased its highest tax rates:
Marginal rate on income over $500,000 was boosted from 6.37% to 8.97%.
Hughes and Seneca (2007) first documented increased outmigration from New Jersey.
Havens (2010) documented large unfavorable shift in wealth movements from New Jersey than from neighboring states.
Young and Varner (2011) document outmigration rise at upper end, but
Regard loss of tax base as very small relative to revenue gain
Argue that tax increase had little or nothing to do with outmigration
Assert high home prices in New Jersey may have spurred outmigration of the well-to-do.

3. Net Migration from New Jersey

4. Taking another look at the issue
Young and Varner
Only considered taxes and outmigration, not taxes and inmigration (did not consider individuals who did not move to New Jersey as a result of the tax change)
Only looked at New Jersey
Assumed that 2004 tax hike had no implications on migration patterns of individuals not immediately affected.
Essentially looked at direct effect on individual migration decisions, and did not take into account expectational and other indirect effects on the rest of the population.
Did not systematically look at the influence of housing costs

5. Study of Interstate Migration
Started with the IRS migration dataset.
This series presents annual state-to-state movements of taxpayers and adjusted gross income.
Assumed migrations are influenced by
Differences in unemployment rates (people likely move from high-unemployment rate to low- unemployment rate states)
Differences in home prices (people likely move from high-home price to low home-price states)
Differences in state income taxes (people likely move from high-tax to low-tax states, especially to those with no state income tax)

6. Results
Statistically significant effects of income tax rate differentials on annual migration.
Housing price differentials also significant.
People and income are attracted to zero income- tax states.
Hard to distinguish from tax differential effect.

7. Implication of Results for New Jersey
Suppose NJ boosted its income tax schedule by one percentage point across the board (and no other state changes its taxes).
This would be a very large tax hike
More than twice as big as the 2004 increase.
Static revenue increase would be nearly $2 ½ billion a year.
One model (without zero tax attractor or state fixed effects) suggests NJ would see increased annual net outflows of
About 4,200 taxpayers (likely about twice as many persons)
About $530 million in AGI
Average income of affected taxpayers equal to about $125,000.
Suggests higher-income taxpayers are most sensitive to changes associated with tax increase.
Model with state fixed effects has comparable income loss, but higher loss of taxpayers.
Similar calculations can be made for any other state.

8. Calculated Effects of 2004 “Millionaires’ tax”
If NJ effective rates had remained at 2003 levels (movement since reflects bracket creep as well as changes in the law), then by 2009
NJ would have had roughly 20,000 more taxpayers.
Adjusted gross income would be approximately $2.4 billion higher, generating more than $125 million in state income tax.
Suggests that revenue boost from 2004 increase has been partly reversed by induced out-migration of the base (as well as lessened in-migration).

9. Some Limitations of the Results
Model does not estimate migration effects on
Business tax revenue
Property tax revenue
Sales tax revenue
The cumulative tax losses to the state could potentially be larger than the model’s predictions
Result not necessarily causal
A weak state economy could spur both outmigration and tax increases.
State fixed effects, unemployment rate would help control for this.
Still suggests that widened tax differential is at least a symptom to be concerned with.

10. Effect of House Prices
A $10,000 increase in New Jersey home prices would be associated with a loss of taxpayers a year and $66 million in adjusted gross income.
Average income of lost taxpayers is in one specification smaller than those affected by a rate increase (about $50,000 a year vs. about $125,000 a year).

11. Preliminary Follow-Up Results
Estimation of model for New Jersey alone shows
Very similar tax effects as that derived from national model.
Stronger home price effects.
Little evidence for effect of longer lags on tax differential.
Suggests that the effect works through the level of interstate differential, not its change.
Suggests that the effect does not materially grow or fade over time.

12. Additional Comments
IRS data does not allow separation of “high- income” and “low-income” taxpayers.
Perhaps county migration data can help capture those effects.
In any event, effects of tax changes on migration can permeate throughout population.
Effect of top marginal rate (purer policy variable) is similar to that of weighted-average marginal rate.

13. Survey Evidence
In July 2011 subscribers to the NJ Division of Taxation’s Tax E- Notes were asked about migration patterns.
Most likely, these are accountants or other financial advisers.
Approximately 200 responded.
More than half said that clients had recently left, or expressed interest in leaving the state.
Given the option to pick 5 out of a list of 11 potential reasons for outmigration, the top ones were
State income taxes (85.4%)
State property taxes (77.7%)
State estate taxes (67.0%)
Retirement (47.6%)
Housing costs (43.7%)

14. Survey Question

15. Conclusions
Analysis of IRS data suggests some connection between interstate tax differentials and migration patterns.
High taxes seem to be associated with loss of higher-income taxpayers.
High home prices seem to be associated with loss of middle- income taxpayers.
Application to New Jersey suggests cumulative outmigration may have offset some portion of the 2004 tax increase.
Given New York’s 2012 reduction in income taxes, sensible to be aware of the potential impact of New Jersey taxes on migration.
Survey responses suggest that New Jersey’s taxes may be on many people’s minds when making location decisions.