Taxes Collection | Carta
Discover premium tax resources for startups and small businesses
Our custom calculators, expert-written articles, and webinars will help prepare your company for tax season—or any season.
Popular articles
Tax planning for small businesses
Author: The Carta Policy Team Date: October 2023 Small businesses owners and entrepreneurs can use these tax planning strategies to save on taxes and maximize business growth.
Business tax deadlines 2026: Corporations and LLCs
Founder Education Date: March 2026 Key tax deadlines are coming up in 2026 for LLC and corporation businesses. Here are the dates and IRS forms you need to know.
How taxes work for LLCs
Founder Education Date: April 2025 Learn how LLC taxation works, what makes LLCs “pass-through” entities, how different types of equity are taxed, and why LLCs avoid double taxation.
Tax advisors
Equity Education Date: November 2022 A tax advisor works with you to model different scenarios that can help minimize your tax liability while staying compliant with the U.S. tax code.
Documents and forms
What is a Schedule K-1 tax form?
Understanding Form 1120-S: Tax return for an S-Corporation
What is Form 3921?
Meet Carta’s Equity Tax Advisors Our team is available for unlimited 1:1 sessions, hosting company-wide webinars, and featured in our on-demand education videos.
The qualified small business stock (QSBS) tax benefit
Introducing QSBS Attestation
QSBS stacking and packing
How to pay less taxes on your startup shares In this episode of Startup Essentials, we break down all the basics that founders, employees, and investors need to know about QSBS — a federal tax exclusion that could provide an enormous tax break when selling shares of a company.
QSBS calculator
2025 AMT calculator
Tax season resources
Taxes and employee equity
Form 6251 and AMT
Equity Date: January 2026 IRS Form 6251 is a worksheet that helps you determine if you owe AMT and how much. You can also calculate your estimated AMT using our AMT calculator.