US

US Year-End Tax Checklist for Founders

Before December 31: maximize retirement contributions, review estimated tax payments, collect W-9s from contractors, reconcile books, and consult your CPA on S-Corp salary and equipment purchases.

3 min read·Updated July 6, 2026

TL;DR

Before December 31: maximize retirement contributions, review estimated tax payments, collect W-9s from contractors, reconcile books, and consult your CPA on S-Corp salary and equipment purchases.

Introduction

Before December 31: maximize retirement contributions, review estimated tax payments, collect W-9s from contractors, reconcile books, and consult your CPA on S-Corp salary and equipment purchases.

This guide is written for first-time founders and solo entrepreneurs who need practical, actionable advice — not theory. Whether you're just getting started or hitting a specific roadblock, the steps below will help you move forward with confidence.

What You Need to Know

Retirement contributions is a critical part of getting this right. Start by researching your specific requirements — they vary by business type, revenue, and location. Document your current situation before making changes.

For most founders, the practical approach is to start simple and add complexity only when your business demands it. Don't over-engineer early decisions, but don't ignore them either. Many founders regret waiting too long to address retirement contributions.

If you're operating across multiple regions (US, UK, EU), note that rules differ significantly. Always verify current regulations with official government sources or a qualified advisor.

Step-by-Step Process

Estimated tax true-up is a critical part of getting this right. Start by researching your specific requirements — they vary by business type, revenue, and location. Document your current situation before making changes.

For most founders, the practical approach is to start simple and add complexity only when your business demands it. Don't over-engineer early decisions, but don't ignore them either. Many founders regret waiting too long to address estimated tax true-up.

If you're operating across multiple regions (US, UK, EU), note that rules differ significantly. Always verify current regulations with official government sources or a qualified advisor.

Common Mistakes to Avoid

Contractor documentation is a critical part of getting this right. Start by researching your specific requirements — they vary by business type, revenue, and location. Document your current situation before making changes.

For most founders, the practical approach is to start simple and add complexity only when your business demands it. Don't over-engineer early decisions, but don't ignore them either. Many founders regret waiting too long to address contractor documentation.

If you're operating across multiple regions (US, UK, EU), note that rules differ significantly. Always verify current regulations with official government sources or a qualified advisor.

When to Get Professional Help

CPA review is a critical part of getting this right. Start by researching your specific requirements — they vary by business type, revenue, and location. Document your current situation before making changes.

For most founders, the practical approach is to start simple and add complexity only when your business demands it. Don't over-engineer early decisions, but don't ignore them either. Many founders regret waiting too long to address cpa review.

If you're operating across multiple regions (US, UK, EU), note that rules differ significantly. Always verify current regulations with official government sources or a qualified advisor.

Key Takeaways

  • US Year-End Tax Checklist for Founders starts with understanding your specific situation and region.
  • Take action on one step today rather than trying to do everything at once.
  • When in doubt, consult a qualified professional for your jurisdiction.
  • Bookmark related guides below to build a complete picture.

Frequently Asked Questions

When should I talk to my CPA?+
October-November for year-end planning. Don't wait until March.
Can I still deduct expenses after year-end?+
Only expenses incurred by December 31 count for the current tax year.