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IRS Pre-Flight Audit
Automated Tax Filing Engine
IRS-compliant 5-step pre-flight audit · Cross-referenced with irs.gov
File a Return
Filing History
Deduction Library
Tax Calendar
Select Form
Enter Data
Pre-Flight Audit
Review & File
Confirmed
Form 1120-S
Due March 15
S-Corp Income Tax Return
S-Corp
âš Penalty: $210/month per shareholder
Form 1065
Due March 15
Partnership Return
Partnership · LLC (Multi-Member)
âš Penalty: $210/month per partner
Form 1120
Due April 15
C-Corp Income Tax Return
C-Corp · Corporation
âš Penalty: 5% unpaid tax/month (max 25%)
Schedule C
Due April 15
Sole Proprietor / Single-Member LLC
Sole Proprietorship · LLC
âš Penalty: 5% unpaid tax/month
Form 941
Due Apr 30 / Jul 31 / Oct 31 / Jan 31
Quarterly Payroll Tax
All with employees
⚠Penalty: 2–15% of unpaid deposits
Form 5472
Due April 15
Foreign-Owned LLC / Corp
LLC · Corporation
âš Penalty: $25,000 per violation
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