Per the Massachusetts Form 1-NR/PY Instructions, page 3:

1. Were you a Massachusetts resident for part of the 2012 tax year?
2. While you were not a resident of Massachusetts in tax year 2012, did you receive Massachusetts source income (e.g., from a job in Massachusetts)?

If you answered "Yes" to both line 1 and line 2, you must file both as a Nonresident and Part-Year Resident. Fill in the "Filing as both a nonresident and part-year resident" oval below the address section of the form if this category applies to you. Complete Schedule R/NR, Resident/Nonresident Worksheet, to calculate the portion of income earned while a Nonresident and the portion of income earned while a Part-Year Resident.

To enter this in the TaxACT program:

1. From within your TaxACT return (Online of Desktop) click on the State Q&A tab and then click on Massachusetts directly below the blue tabs
2. Select Click Here for Step-by-Step Guidance through the Massachusetts Q&A
3. Select Nonresident/part-year resident and click Continue
4. On the screen titled Massachusetts – Residency Status on Form 1-NR/PY select Both – Part-year and nonresident (Schedule R/NR) and click Continue
5. The program will proceed with the interview questions for you to enter or review the appropriate information
6. On the screen titled Massachusetts – Nonresident Apportion click Yes
7. Enter all applicable income information
8. When you reach the screen titled Massachusetts – Schedule R/NR Income Adjustments click Continue
9. In the following screens, you will need to allocate your income