Your First Steps to Stress-Free Tax Filing

Getting Started

State Registration & Tax Filing to Ensure Business Compliance

Registrations & Filings

Your guide to integrating third-party services with step-by-step instructions 

Integrations

Manage your Kintsugi subscription, billing details, payment methods, invoices, and learn about pricing plans, refunds, and account changes.

Subscription & Billing

Frequently Asked Questions

Explore our collection of helpful guides, contact information, and tools to assist you with tax-related questions and processes.

Resources

Troubleshooting

Collection of Kintsugi's product & marketing contents

Blogs

Compliance resources covering registrations, transfers, major business changes, and account closures or de‑registrations.

Registrations with Kintsugi

Learn what information you need to provide when completing a registration for your business

General Documents Required for Submitting a Registration

Learn what "Presence" means and how it applies to your business

What Is “Presence” for a Business?

Why Kintsugi Doesn’t Use Streamlined Sales Tax (SST)

A streamlined, IRS-approved process for international customers who need an EIN to register and operate in the United States

How International Businesses Can Apply for an EIN Without a U.S. Presence

Auto Register Explained: Which States Qualify

A practical guide to help you wrap up operations smoothly and stay compliant

What To Do When You’re Permanently Closing Your Business

This guide provides a comprehensive state-by-state breakdown of initial registration fees and recurring renewal fees for sales tax permits across all 45 taxable US states.

State-by-State Sales Tax Permits: 2026 Registration & Renewal Fee Guide

How to Submit a Registration Request for States Where Nexus Isn’t Established (Not Exposed)

Submitting a Request to Start Registration