@jonhai --
I strongly suggest that you clarify with your employer as to whether or not they will be withholding federal taxes from your pay.
Ideally they would withhold both federal and Indiana taxes for you (assuming you're never going to physically work in MD). If there's going to be no withholding at all, then you will need to make both federal and Indiana quarterly estimated payments as stated by @NCperson.
If they are going to withhold federal - but not Indiana - taxes, then you'll need to make estimated tax payments only to Indiana.
https://www.in.gov/dor/individual-income-taxes/payments-and-billing/estimated-tax/
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
