Accounting & Tax Compliance Platform for US Businesses
All your US business taxes, expertly handled
Income Tax | Sales Tax | Payroll Tax | County Tax | City Tax | R&D Tax Credit
Income Tax
Manage federal and state income tax obligations with integrated ledger syncing.
Sales Tax
Track and file multi-state sales and use taxes across all active nexus locations.
County Tax
Address local county-level business property and operations taxes with ease.
Payroll Tax
Handle employment-related tax filings and payments for domestic and international teams.
City Tax
Stay compliant with municipal business licenses and gross receipts taxes.
R&D Tax Credit
Identify and claim research and development tax incentives for your innovations.
Income Tax
Manage federal and state income tax obligations with integrated ledger syncing.
Sales Tax
Track and file multi-state sales and use taxes across all active nexus locations.
County Tax
Address local county-level business property and operations taxes with ease.
Payroll Tax
Handle employment-related tax filings and payments for domestic and international teams.
City Tax
Stay compliant with municipal business licenses and gross receipts taxes.
R&D Tax Credit
Identify and claim research and development tax incentives for your innovations.
Uncovering tax compliance gaps
Missing tax obligations can quietly create bigger compliance risks, costly mistakes, and unexpected financial consequences.
Hidden Tax Requirements
Information gaps in tax filing – 40% SMBs unaware of all tax obligations.
Complex Filing Process
Fragmented and complex tax filing process make it all the more error prone.
Limited Tax Awareness
Limited awareness of full tax implications.
Missed Local Taxes
City and county-level taxes often missed.
Costly Tax Catch-Up
Missed taxes lead to retroactive payments for previous years.
Heavy Compliance Penalties
Heavy penalties for tax noncompliance, especially for foreign subsidiaries (> $10K).
Stay ahead of every tax obligation
Stay organized, prepared, and supported across every tax requirement, so nothing gets missed.
Periodical Tax Calendars
Periodical Tax Calendars
Stay organized with customized tax calendars for better planning.
Advance Deadline Alerts
Advance Deadline Alerts
Get timely alerts so you're always prepared to file on time.
Automated Extension Filing
Automated Extension Filing
If you can't file on time, Fin-Tax automatically files extensions on your behalf.
Comprehensive Tax Coverage
Comprehensive Tax Coverage
Every tax type accounted for - federal, state, county, or city.
Expert Audit Support
Expert Audit Support
Our team is here to assist you through every step of the audit process.
Tax Knowledge Hub
Tax Knowledge Hub
We provide step-by-step guidance and expert assistance for accurate tax filings.
Income Tax Filing Guide
Who needs to file?
US citizens & residents with income above the filing threshold must file annually.
Key Deadlines
April 15 for federal returns. Extensions available via Form 4868 by the same date.
Required Documents
Sales Tax Quick Reference
Nexus Rules
Economic nexus triggers vary by state — typically $100K in sales or 200 transactions.
Filing Frequency
Monthly, quarterly, or annually based on your sales volume per state.
Required Documents
Payroll Tax Compliance
Employer Obligations
Withhold FICA taxes (Social Security & Medicare) from every employee paycheck.
Deposit Schedule
Semi-weekly or monthly deposits based on your lookback period tax liability.
Required Documents
Tax Compliance Insights
Feb 18, 2026
The R&D Tax Credit: How US Startups Can Save Thousands
Oct 13, 2025
C Corp Tax Forms You Should Know Before the October 15 Deadline
Sep 18, 2025
Washington State Sales Tax Changes 2025: New Rules for More Services
Choose your coverage
Tax & Filing Compliance Package
based on number of filings
Income Tax Package
- Annual federal income tax return
- Annual state income tax returns
- Foreign subsidiary reporting - Form 5471
- Foreign shareholder reporting - Form 5472
- Estimated tax payments-quarterly review
Sales Tax Package
- Sales tax nexus review
- Sales tax applicability study
- Sales tax registrations
- Sales tax filings
Local Compliance Package
- City registrations
- County registrations
- Business license
- Property tax filing
SOS and Treasury Compliance
- Annual return filing with Secretary of State
- Beneficial ownership information report
- Department of Treasury filings
Optional Add-ons
Simplify your business taxes
Keep every tax requirement on track
We handle planning, filings, deadlines, and compliance, so you can focus on running your business.