I moved on 11/25/18 from virginia to south carolina with my company. I didn't start working until 12/01/18 and didn't register with the south carolina DMV until 1/15/19.

[intensem11]

At which point should i consider myself a resident in SC if I didn't technically register with the SC DMV until 1/15/2019? I have a W-2 for both virginia and south carolina from my company.

[BMcCalpin]

South Carolina answers your question this way:

"You are a South Carolina resident, even if you live outside South Carolina, when:

1. Your intention is to maintain South Carolina as your permanent home; AND
2. South Carolina is the center of your financial, social, and family life; AND
3. When you are away, South Carolina is the place to which you intend to return.

You are a nonresident if your permanent home is outside South Carolina all year and none of the above apply. "

See https://dor.sc.gov/tax/individual-income/faq

Where you work and where your drivers license is registered are just a few of the many questions of fact that go into determining residency.

I think you answered your own question when you said "I moved on 11/25/18". At the least, when did you move into a house or an apartment in SC? Same day? There's your answer.