This tutorial will provide a step-by-step guide to completing form aoc e-100 the application and assignment year's allowance. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 20.Step 2 Complete the Document. Fill out all relevant fields in Form AOC-E-100, take a break, and then review. Form NC-4 Employee's Withholding Allowance Certificate.