Submit the completed Idaho Form 42A along with Form 42 to the Idaho State Tax Commission. Forms can be submitted through mail or electronically via the Idaho State Tax Commission’s online portal. For mail submissions, send to: Idaho State Tax Commission, PO Box 36, Boise, ID 83722-0410. For electronic submissions, visit tax.idaho.gov and follow the instructions for online filing. Ensure all required fields are accurately completed and included.

Important dates for this form in 2024 and 2025 include the submission deadlines that typically fall on April 15th for annual filings. Check the Idaho State Tax Commission's official website for any updates or changes to these deadlines.

The purpose of Idaho Form 42A is to provide a detailed by-company apportionment factor breakdown for businesses operating in Idaho. It supplements the main Idaho Form 42, ensuring accurate reporting of property values, sales figures, and payroll data specific to each company. By completing this form, businesses can accurately compute their Idaho apportionment factor and fulfill their state tax obligations.

• 1. Name as shown on return: Enter the business name exactly as it appears on the tax return.
• 2. Federal Employer Identification Number (FEIN): Provide the FEIN number for the business.
• 3. Three-factor apportionment checkbox: Check if using three-factor apportionment.
• 4. Idaho Property: Includes owned property at original cost and rented property calculations.
• 5. Inventories: List inventories at the beginning and end of the year.
• 6. Real and tangible personal property: Report real and tangible personal property values at year start and end.
• 7. Total property: Calculate total property by adding specific lines and computing averages.
• 8. Idaho property percentage: Divide total property by the Form 42 line 8 total column.
• 9. Idaho Sales (Gross Receipts): Report gross sales, returns, allowances, and other business receipts.
• 10. Gross sales: Enter gross sales, less returns and allowances.
• 11. Sales delivered or shipped to Idaho purchasers: Include these sales figures.
• 12. Idaho throwback sales: Report any Idaho throwback sales.
• 13. Sales of services: Include sales of services.
• 14. Other business gross receipts: Report other business gross receipts.
• 15. Idaho sales percentage: Divide total gross receipts by the Form 42 line 15 total column.
• 16. Idaho Payroll: Detail total wages and salaries paid.
• 17. Total wages and salaries: Report total wages and salaries.
• 18. Idaho payroll percentage: Calculate by dividing total wages by Form 42 line 18 total column.
• 19. Total percentage: Sum percentages from property, sales, and payroll.
• 20. Idaho apportionment factor: Compute the final apportionment factor by using line 19 and dividing by the number of factors.

Failing to submit this form can lead to various penalties and delays in processing your state tax return.

• Penalties: You may incur penalties for late or non-submission.
• Delayed Processing: Your state tax return processing may be delayed.
• Inaccurate Tax Reporting: Failure to submit may result in inaccurate tax reporting and compliance issues.

• 1. Transacting Business in Idaho: Your business is engaged in activities within Idaho.
• 2. Required State Tax Reporting: You need to report by-company apportionment factors for state tax purposes.
• 3. Using Form 42: You are completing the Idaho Form 42 and require detailed company breakdowns.