Form 1120S Checklist: S Corporation Tax Return
CPA and S Corporation Resource
Prepare Form 1120-S (U.S. Income Tax Return for an S Corporation) with our checklist. For CPAs, S-corp owners, and accountants. Gather books, shareholder basis data, officer reasonable compensation, distributions, and K-1 information so the S corporation return and shareholder Schedules K-1 are accurate. Confirm a valid Form 2553 election is in effect. Not tax advice.
Key Benefits
Confirm S election status before filing
Track shareholder stock and debt basis
Document reasonable officer compensation
Report distributions correctly on K-1s
Reconcile AAA and retained earnings
Professional S corporation tax workflow
Common Use Cases
S corporations filing Form 1120-SCPAs preparing S-corp returns and K-1sOwner-employees documenting W-2 wagesBookkeepers closing S-corp books for taxFirms reviewing AAA and basis rollforwardsNew S corps after Form 2553 acceptance
Frequently Asked Questions
What is Form 1120-S?
Form 1120-S is the income tax return for corporations that have elected S corporation status. Income generally passes through to shareholders on Schedule K-1 rather than being taxed at the corporate level (with limited exceptions).
Why does officer compensation matter?
Shareholder-employees who provide services generally must receive reasonable W-2 wages before taking distributions. Underpaying wages is a common IRS focus area for S corporations.
What is shareholder basis?
Stock and debt basis limits loss deductions and characterizes distributions. Maintain annual basis schedules for each shareholder using contributions, income, distributions, and loans.
Do I need Form 2553 on file?
Yes. The S election (Form 2553) must be effective for the tax year. Keep IRS acceptance evidence with the permanent tax file.
Checklist
Entity
Form 2553 acceptance / proof S election is in effect
Required
Confirm effective date covers the tax year.
Tax History
Prior-year Form 1120-S and Schedules K-1
Required
AAA, OAA, and basis start from prior filings.
Books
Year-end P&L, balance sheet, and trial balance
Required
Match books provided to the tax preparer.
Compensation
Officer / shareholder-employee W-2 wages and payroll records
Required
Support reasonable compensation for services.
Shareholders
Shareholder distribution detail by date and amount
Required
Needed for K-1 box 16 and basis reductions.
Shareholder stock and debt basis schedules
Required
Update annually for each shareholder.
Shareholder ownership percentages during the year
Required
Document transfers with dates.
Assets
Fixed asset and depreciation reports
Required
Form 4562 support and election statements.