Follow the steps to complete the IRS 8990 online effectively.

1. Click 'Get Form' button to obtain the form and open it in the editor.
2. Begin by entering your identification number and the taxpayer name(s) as shown on your tax return.
3. If applicable, fill in the details for any foreign entity related to the form, including the name, employer identification number, and reference ID number.
4. Complete Part I, starting with Section I for Business Interest Expense, where you will need to input your current year business interest expense and carryforwards from previous years.
5. Continue by calculating your total business interest expense by adding the amounts listed in lines 1 through 4.
6. Proceed to Section II for Adjusted Taxable Income. Fill in your taxable income and any necessary adjustments based on the instructions provided.
7. Calculate your total current year partner's excess taxable income and any adjustments required for line 6.
8. In Section III, report your current year business interest income, as well as any excess business interest income from pass-through entities.
9. Move to Section IV to perform the limitation calculations on business interest expense, multiplying the adjusted taxable income by the applicable percentage as described in the instructions.
10. Complete Part II if you are a partnership and Part III if you are an S corporation, entering the relevant information for excess business interest expense and taxable income.
11. Review all sections for accuracy before finalizing your entry.
12. Once completed, you can save your changes, download, print, or share the completed form as required.

Get started now to complete your IRS Form 8990 online efficiently.