Follow the steps to fill out the NY IT-638 form online.

1. Click 'Get Form' button to obtain the form and open it in an online editor.
2. Indicate your filing period. If you are a calendar-year filer, mark an X in the designated box. For all other filers, enter your tax period's beginning and ending dates.
3. Provide your name(s) as shown on your return and the identifying number as shown on your return.
4. Complete line A by indicating if you are claiming this credit as an individual, partnership, or as fiduciary of an estate or trust by marking the appropriate box.
5. If you answered 'No' to line A, complete lines B, C, and D as well as Schedules B, D, and E. If you answered 'Yes', complete these lines and then continue to the additional requirements per your entity type.
6. Enter the certificate number from Form DTF-74 in line B and indicate if you are certified by multiple sponsors in line C, entering sponsors' names if applicable.
7. For line D, indicate the year of your Start-Up NY business tax benefit period by entering a number between 1 and 10.
8. Proceed to Schedule A and calculate the allocation factor based on property value and wages, following the instructions carefully.
9. For partnerships, enter the allocation factor on Form IT-204, line 151. For all other filers, enter it on line 17.
10. Complete the necessary information on Schedule B and Schedule C based on your entity type, ensuring all details are accurate.
11. Fill out Schedule D to determine the tax factor and complete Schedule E for the computation of credit.
12. Review all entries for correctness. Once completed, save changes, download, print, or share the form as needed.

Complete your NY IT-638 form online today for a smoother filing experience.