How much of a 401k distribution is taxable by a new state I moved to?

[rodgnkel]

Took early 401K distirbution in Maryland.  Moved to South Carolina and was here less than a month when received the distribution.  Was only in South Carolina for last 3 months of the year.  How much of the distribution is taxable by South Carolina?
South Carolina State Taxes Line 10b

[ToddL · Accepted solution]

If you changed your state of residence from Maryland to South Carolina and received the distribution while a resident of South Carolina, then all of the distribution is attributed to (i.e. taxed by) South Carolina. Retirement distributions (early or normal) are "retirement income" and are taxed by your state of residence at the time of the distribution.

Effective for retirement income received after December 31, 1995, federal law prohibits any state from taxing certain retirement income (mainly pension income) unless you are resident of, or domiciled in, that state. For example, if you receive a pension from your former California employer and you now reside in New Mexico, California may not tax your retirement income. Because you are now a New Mexico resident, your retirement income is taxable in New Mexico.