Blog
Practical guides to sales tax, VAT, and GST.
Avalara Pricing in 2026: Plans, Per-State Costs and Limits
Avalara's published pricing is $79 per state per month or $799 per state per year, with a 3-state minimum and extra fees. What it costs as you add states.
Read articleHow to Verify a Tax ID Number: EIN, Permit and VAT
You can't look up another business's EIN, but you can verify a sales tax permit, a resale certificate and a VAT number. Each method and its limits.
Read articleResale Certificate Expiration by State: How Long Each One Lasts
Ten states put an expiration date on resale certificates. Most others let them run until revoked, with a 12-month gap rule. State-by-state guide.
Read articleWhat Is IOSS? The EU Import One-Stop Shop Explained
IOSS lets sellers charge EU VAT at checkout on imports up to EUR 150. Who can use it, the 2026 EUR 3 duty, getting the number to customs, and IOSS vs OSS.
Read articleHow to File Sales Tax Online, State by State (2026)
Portal, return form, and due date for filing sales tax online in 46 states, with a step-by-step guide for each. Sourced from the state tax agencies.
Read articleAvalara Alternatives: 7 Options Compared (2026)
Avalara alternatives compared: why teams switch, published pricing with per-state math, who each option fits, and how to move from Avalara to Kintsugi.
Read articleMarketplace Facilitator Laws by State (2026)
Marketplace facilitator laws by state for 2026: thresholds, effective dates, what marketplaces must collect, and what sellers still owe in each state.
Read articleSales Tax on Shipping by State (2026)
Is shipping taxable? A 50-state table of how states tax delivery charges, when separately stated shipping is exempt, and how handling changes it.
Read articleWhat Is Use Tax? How It Works for Businesses
Use tax is owed on taxable purchases when sales tax wasn't collected. Learn who owes it, consumer vs. seller use tax, examples, and how states collect it.
Read articleWhat Is VAT? Value-Added Tax Explained
VAT is a consumption tax collected at each stage of the supply chain and paid by the final consumer. Learn how it works and when US sellers owe it.
Read articleDo US Companies Have a VAT Number?
US companies do not have a federal VAT number, but they may need foreign VAT or GST registrations when they sell, store inventory, or operate abroad.
Read articleWhat Is a VAT Number? VAT ID Formats by Country
A VAT number is the tax ID a country issues to VAT-registered businesses. See EU and UK formats, when non-resident sellers need one, and how to apply.
Read articleCan US Businesses Claim VAT Refunds Abroad?
Learn when a US business can reclaim VAT paid abroad, which records it needs, and why a foreign VAT refund differs from a US sales-tax refund.
Read articleVAT vs. Sales Tax: What’s the Difference?
VAT and sales tax are both consumption taxes, but they differ in when they're collected, how businesses recover tax, and where US companies may owe it.
Read articleThe Best Sales Tax Software for Accountants and CPA Firms in 2026
Compare sales tax software for accountants in 2026: how Kintsugi, Avalara, TaxJar, Anrok, and more handle multi-client filing, nexus, and firm dashboards.
Read article10 Sovos Alternatives Compared: Features, Pricing, Pros and Cons
Comparing Sovos alternatives in 2026? See 10 top Sovos competitors with features, pricing notes, pros and cons.
Read articleSales Tax Exemption Guide
Understand product, entity, use, and resale exemptions and learn how to manage certificates without creating avoidable compliance exposure.
Read articleWhy Is Shopify Not Collecting Sales Tax?
Find common reasons Shopify may not collect tax, from missing nexus settings and permits to exempt products, customers, and tax overrides.
Read articleBuilding Year-Round Advisory: How Sales Tax Changes the Client Relationship
Support clients year-round and grow revenue by developing a sales tax advisory practice with Kintsugi.
Read articleAI Adoption Is Outrunning Security in Accounting. Here's How Kintsugi Is Built Differently
Over half of accounting pros now use AI, but most firms lack data guidelines. Here is how Kintsugi builds security into sales tax compliance.
Read articleGeneral AI Wasn't Built for Sales Tax Compliance
Companies are losing control of AI costs. Here's why sales tax needs purpose-built AI, not an all-purpose chatbot.
Read articleHow Kintsugi Works
New to Kintsugi? Here's a breakdown of how the platform monitors nexus, calculates tax, and automates filing so your team doesn't have to.
Read articleHow to Register for VAT in Germany: Step-by-Step Guide for Businesses
Learn how to register for VAT in Germany, who needs to register, required documents, timelines, common mistakes, and ongoing compliance requirements.
Read articleWhere Sales Tax Compliance Breaks Down in Your Org
Sales tax compliance fails at the handoffs. See the most common internal accountability gaps and what it takes to close them.
Read articleThe Hidden Cost of Sales Tax at Scale
Sales tax compliance drains staff hours, triggers penalties, and stalls M&A deals. See where costs compound at scale and how automation removes them.
Read articleAutomating Product Classification for Streamlined Compliance
Misclassified products and expired exemption certificates are top audit triggers. Learn to map tax codes and manage exemptions across states.
Read articleDo Wholesale Orders Count Toward Economic Nexus? It Depends
Wholesale and exempt sales count toward economic nexus thresholds in some states but not others. See which states include B2B volume and what it means.
Read articleMeet Kin, the AI Assistant Inside Kintsugi for Sales Tax, VAT and GST
Meet Kin, Kintsugi's in-app AI assistant for sales tax, VAT, and GST. Grounded in your business data, it cites its sources and fits the work you do.
Read articleSales Tax Compliance with Consumption Pricing
Moving from seat-based to consumption pricing changes your sales tax exposure. See how variable billing affects nexus thresholds, taxability, and filing.
Read articleWhat US ecommerce Brands Get Wrong About International Tax (And How AI Fixes It)
A first-timer's playbook to VAT, GST, and cross-border sales tax for US ecommerce brands going global, with what you need to know about compliance in 2026.
Read articleSales Tax for Health and Wellness Brands: What You Need to Know Before You Scale
The compliance landscape is more complex than most founders expect — here's how to stay ahead of it.
Read articleThe Easiest Way to Start the Sales Tax Conversation with Your Clients
How accounting firms can start the sales tax conversation with clients, and why a nexus study is the easiest way to surface real exposure.
Read article10 Best GST Compliance Software for Businesses in 2026
Compare 10 leading GST compliance software tools for 2026 on AI automation, real-time monitoring, audit-ready filing, pricing, and pros and cons.
Read article8 Best Indirect Tax Software 2026
Discover the best indirect tax software for 2026. Compare them for accuracy, automation, and compliance. Save time & boost efficiency. Full reviews inside!
Read articleBest Accounting Software for VAT Returns in 2026
Compare the best accounting software for VAT returns in 2026 on features, compliance, automation, and ease of use to find the right fit for smooth filing.
Read articleBest Alternatives to NetSuite Sales Tax Automation in 2026
Compare the top alternatives to NetSuite sales tax automation on features, pricing, and integrations, with expert comparisons to streamline compliance.
Read article9 Best Cross-Border VAT Compliance Software (2026 Guide)
Expand globally without the tax headache. Discover the 9 best cross-border VAT compliance software tools to automate international taxes, filings, and GST.
Read article9 Best Global Tax Compliance Software Solutions
Expanding internationally? Compare the 9 best global tax compliance software tools for nexus tracking, VAT/GST filings, and compliance.
Read article8 Best Multi-State Sales Tax Software Solutions
Expanding across state lines? Discover the 8 best multi-state sales tax software tools to automate economic nexus tracking, filings, and compliance.
Read articleBest Shopify Sales Tax Software for Multi-State Compliance (2026)
Compare the best Shopify sales tax software for multi-state compliance on automation, accuracy, pricing, and Shopify integration to simplify state filings.
Read articleBest Software for Multi-State Nexus Management and Tax Compliance (2026)
Compare the best multi-state nexus management software for 2026: features, pros, drawbacks, and how modern tools automate nexus tracking and filings.
Read articleHow Firms Can Simplify Sales Tax for Clients
Learn how accounting firms can help clients manage fragmented sales-tax rules, marketplace complexity, nexus, reconciliation, and automation.
Read articleHow to Submit Sales Tax: A Step-by-Step Guide
A step-by-step guide to submitting sales tax: filing requirements, deadlines, tools, and tips to avoid penalties, for businesses of every size.
Read articleInternational Tax for Ecommerce
Learn why international ecommerce tax obligations can start earlier than expected, how to find your exposure, and how to monitor it at scale.
Read articleThe Critical Impact of Sales Tax
What the BART funding crisis shows about what sales tax pays for, and why accurate compliance matters to the communities it supports.
Read articleHow Kintsugi Uses AI
Learn how Kintsugi Intelligence combines AI, deterministic tax workflows, and human review to support auditable sales-tax compliance.
Read articleThe Modern Approach to Sales Tax Compliance
Built on Trust, Powered by AI: Kintsugi's modern approach to sales tax compliance
Read article8 Best Amazon Seller Tax Software Tools for 2026
Compare the top sales tax software for Amazon FBA sellers and find the right tool to automate nexus tracking, filing, and reporting for your store.
Read articleBest Sales Tax Software for QuickBooks: 2026 Guide
Is your QuickBooks sales tax audit-ready? Compare the top 8 software tools for 2026 to automate filings, track nexus, and reduce your liability risk.
Read articleHow to Scale Client Advisory Services with Sales Tax Automation
How accounting firms can scale client advisory services profitably by automating sales tax compliance instead of absorbing it as manual work.
Read articleWhat is Physical Nexus?
Learn how employees, inventory, contractors, trade shows, and other physical connections can create a sales tax obligation.
Read articleScale Without Tax Compliance Worries: A Guide
Growth can trigger nexus in states you did not know you sold into. See what reliable sales tax automation covers: nexus alerts, filing, and pricing.
Read articleStart the Year Right: Your 2026 Sales Tax Compliance Checklist
A practical checklist for nexus, registration, product taxability, rates, exemptions, filing, and marketplace sales.
Read articleIs TaxJar Still Right for You in 2026? What the Stripe Acquisition Changed
Since Stripe bought TaxJar, Starter went from $19 to $39 a month, free AutoFile credits shrank, and new NetSuite and Stripe connections ended.
Read articleBest Sales Tax Software for SaaS Companies: 2026 Guide
The 8 best sales tax software platforms for SaaS in 2026, compared on billing logic, integrations, transparent pricing, and global compliance.
Read articleTop 7 VAT Compliance Solutions for Global Expansion in 2026
Compare 7 VAT compliance solutions for 2026, including Kintsugi, Fonoa, Quaderno, Avalara, Sovos, Vertex, and Paddle, on pricing, coverage, and fit.
Read articleCross-Border Tax Complexity: U.S. Sales Tax and VAT/GST Abroad
Build a tax-ready foundation for selling across US states and international VAT and GST jurisdictions.
Read articleWhy Fractional CFO Companies Are Essential for SaaS and Ecommerce Businesses
This was written in collaboration with our partner, Zeni . It shares their perspective on things you should consider when evaluating your options.
Read articleTaxdoo Ends VAT Compliance Services in 2026—Why Kintsugi Is the Best Alternative
Taxdoo's exit from VAT compliance leaves ecommerce sellers evaluating dedicated alternatives for ongoing filings, calculations, and global tax support.
Read articleThe Complete Guide to Selecting the Best AI Tax Software for Your Business: 7 Tools Compared
We compared seven AI sales tax tools, including Kintsugi, Avalara, TaxJar, Anrok, and Vertex, on pricing, integrations, nexus monitoring, filing, and VDAs.
Read articleWhy State & Local Audits Are on the Rise (And What It Means for Scaling Businesses)
It's no secret that states rely heavily on sales tax as a stable source of revenue. Sales tax hasn't always been strictly enforced, but in recent years.
Read articleLeading AI Tax Automation Companies in 2026
Compare 8 AI tax automation companies, including Kintsugi, Avalara, Vertex, and Sovos, on AI features, filing automation, and who each fits.
Read articleHoliday Sales Tax Guide: Gift Cards, Subscriptions, and Bundled Deals Explained
Understand sales-tax considerations for gift cards, subscriptions, and bundled deals during holiday sales, including redemption and mixed-taxability risks.
Read articleBest Sales Tax Software 2026: 11 Tools Compared
An honest comparison of the best sales tax software in 2026: pricing, coverage, filing, integrations, and who each tool fits, with our methodology.
Read articleAvalara's Second IPO Attempt: What It Means for Your Sales Tax Software
Avalara is part of the old guard: a tax automation system that's slower, more complex, and investor-driven
Read article5 Sales Tax Ecommerce Mistakes To Avoid During Black Friday & Cyber Monday Sales
Avoid common BFCM sales tax mistakes involving bundles, nexus, shipping, digital products, and exemption certificates.
Read article10 Best Sphere Alternatives for Sales Tax Automation in 2026
Comparing 10 Sphere alternatives for sales tax automation in 2026 on coverage, integrations, pricing model, and which businesses each tool fits.
Read articleTaxCloud Alternatives: 7 Options Compared (2026)
TaxCloud alternatives compared: why sellers switch, published pricing, who each option fits, and how to move from TaxCloud to Kintsugi.
Read articleTaxJar Alternatives: 7 Options Compared (2026)
TaxJar alternatives compared: why sellers switch, published pricing and filing math, who each option fits, and how to move from TaxJar to Kintsugi.
Read articleSelling Your Brand? Why Sales Tax Compliance Can Make or Break the Deal
Sales tax liabilities can affect valuation, diligence, escrows, and closing timelines. Learn how to become tax-ready before selling your business.
Read articleRegular Sales Tax Risk Assessments: A Must for Every SaaS Company
How to run a SaaS sales tax risk assessment: rules, rates, and key compliance steps for 2026, in a practical breakdown for finance and ecommerce teams.
Read articleUnderstanding Sales Tax on Vitamins and Supplements
Are vitamins and supplements taxable? States classify them differently, so they can be taxed in one state and exempt in the next. The rules.
Read articleHow to Automate Sales Tax in SaaS: Step by Step
Connect billing data to a tax engine that understands SaaS taxability, monitors nexus, calculates address-level rates, and automates filing.
Read articleHow to Automate Sales Tax in Ecommerce: Tools, Tips, and Best Practices
Learn how to connect your ecommerce store, map obligations, validate products and exemptions, monitor nexus, and enable filing and remittance.
Read articleWhat Is Sales Tax Automation? A Beginner’s Guide to Stress-Free Compliance
Understand how sales tax automation calculates, collects, reports, and remits tax while monitoring nexus and keeping records audit-ready.
Read articleStripe Invoicing vs. Stripe Payments: 7 Reasons Invoices Win
Stripe Invoicing vs. Stripe Payments: features, pricing, automation, and ideal fit compared side-by-side. Pick the right sales tax platform for 2026.
Read articleAre You Audit-Ready? Sales Tax Documents You Should Always Have In The US
The sales tax records every US business should keep for an audit: sales and exemption records, returns, and proof of what you collected.
Read articleTariffs vs. Sales Tax: What US Importers Need to Know
Tariffs and sales tax apply at different points in the supply chain. How each works, whether tariffs are taxable, and what US importers must know.
Read articleWhat Are Back Taxes and How Do They Affect Your Ecommerce Business?
Learn how ecommerce businesses create back-tax exposure, how to check what is owed, and which options can help settle past sales tax liabilities.
Read articleWhat Is an Out-of-State Resale Certificate and How Does It Work?
How out-of-state resale certificates work, and how automating your sales tax compliance can help | Kintsugi
Read articleSales Tax Product Classification: Why It’s Important and How to Get It Right
Learn why sales tax product classification matters, how tax codes work, and practical tips to classify products accurately across jurisdictions.
Read articleKintsugi Supports EU VAT
The same level of automation, intelligence, and simplicity you've come to rely on from Kintsugi for the U.S. and Canada is now available for the European.
Read articleUnderstanding Uncollected, Unpaid Sales Taxes And the Registration Process
What to do about uncollected and unpaid sales tax: how past liabilities build up, how to register and catch up, and how to limit penalties.
Read articleSales Tax Errors: 8 Common Compliance Mistakes That Could Cost Your Business
Learn how consumer use tax, exemption certificates, marketplace assumptions, rates, filings, nexus, and product classification create sales tax risk.
Read articleWhat Is a Sales Tax Permit? Your Guide to Registration, Verification & Compliance
Learn what a sales tax permit authorises, when online sellers need one, how to register and verify it, and what to do after approval.
Read articleWhy VDAs for Sales Tax Compliance Matters for SaaS Companies
Why voluntary disclosure agreements matter for SaaS companies with past sales tax exposure: reducing penalties, back taxes, and audit risk.
Read articleVoluntary Disclosure Agreements (VDAs) and How E-Commerce Brands Use Them for Sales Tax Compliance
How ecommerce brands use voluntary disclosure agreements to resolve past sales tax liabilities, reduce penalties, and set up ongoing compliance.
Read articleDo I Charge Tax on Shopify When Dropshipping?
Do you need to charge sales tax when dropshipping on Shopify? Learn the physical, economic, and marketplace nexus rules that decide it.
Read articleCan You Charge Sales Tax on Shipping? Rules for Ecommerce Sellers
Learn whether shipping and handling charges are taxable, how state rules differ, and how ecommerce sellers can manage sales tax on shipping.
Read articleDoes Gross Sales Include Sales Tax? Understanding Sales Tax Reporting
No: gross sales exclude the sales tax you collect. How to separate taxable sales, collected tax, and deductions when you report and file returns.
Read articleRemit Taxes Efficiently: Tips for Smooth Filing
How to remit sales taxes: what remittance means, the steps to file and pay on time in each state, and the multistate pitfalls behind missed deadlines.
Read articleHow to Integrate Kintsugi Sales Tax Automation with Stripe: A Step-by-Step Guide
Learn how to connect Kintsugi and Stripe, prepare your account, verify product classification, and enable tax collection for automated sales-tax workflows.
Read articleEssential FAQs for Shopify Businesses Considering Sales Tax Automation
Answers to common questions Shopify merchants ask before switching to sales tax automation: setup, nexus tracking, filing, and costs.
Read articleTop 10 Ecommerce Sales Tax Software Solutions for 2026
10 ecommerce sales tax tools compared on price, coverage, filing, and integrations, from Kintsugi and Avalara to TaxJar and Stripe Tax, with who each fits.
Read articleHow to Set Up and File Sales Tax Returns with Shopify in 2026
Follow a practical Shopify sales tax setup: identify nexus, register, configure collection, review reports, and file and remit on schedule.
Read articleSaaS Sales Tax by State: 2026 Taxability Guide
Is SaaS taxable? See SaaS sales tax status for all 50 states and DC, with rates, official citations, and how to decide what to charge.
Read articleEcommerce Sales Tax 2026: What Every Online Seller Needs to Know
Learn how ecommerce sales tax works in 2026, including permits, nexus, marketplace facilitators, sourcing, rate changes, and automation.
Read articleResale Certificates: Who Qualifies and How to Obtain One
Learn how resale certificates prevent double taxation, how they differ from sales tax permits, and what multi-state sellers should track.
Read articleAutomating Sales Tax for Everyone: The Simplest Guide for Shopify Merchants
A simple guide to sales tax automation for Shopify merchants: tracking rates and nexus, automating filings, and staying compliant as you grow.
Read articleWhy Sales Tax Rates Differ Across the U.S.
Why sales tax rates vary so much across US states and cities: state autonomy, local add-on taxes, and the fiscal needs each rate funds.
Read articleUnderstanding the Rules of Sales Tax: A Simple Guide
Sales tax basics explained: what it is, how it's collected and remitted, key concepts like nexus and exemptions, and what business owners owe.
Read articleUnderstanding Dropshipping and Sales Tax: A Comprehensive Guide
Learn how dropshipping businesses should think about economic nexus, resale certificates, use tax, and multi-state sales-tax compliance.
Read articleUnderstanding Sales Tax on Digital Products
How states tax digital products like ebooks, downloads, and software, what qualifies as digital, and how nexus rules apply to digital sellers.
Read articleHow to Calculate Sales Tax: Formula and Examples
The sales tax formula, worked examples for single and combined rates, how to back tax out of a total, and mistakes that cause over- or under-collection.
Read articleSales Tax on Menstrual Products and the Pink Tax
How the pink tax and tampon tax meet sales tax policy, with the menstrual product exemptions in California, New York, and Texas.
Read articleCan You Include Sales Tax in Your Prices?
Tax-inclusive vs. tax-exclusive pricing: when to build sales tax into your prices, what local rules to check, and how to show tax on receipts.
Read articleStates With No Sales Tax: The 5 NOMAD States
Five states have no statewide sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. The local and business taxes that still apply in each.
Read articleDiscover the States with Lowest Sales Tax Rate in 2026
Which states have the lowest sales tax rates in 2026, how low rates affect pricing and consumer spending, and what they mean for businesses.
Read articleExplaining What Is Economic Nexus: Simplified
Learn what economic nexus means, how sales thresholds create tax obligations, and how businesses can monitor nexus across jurisdictions.
Read articleCorrecting Sales Tax Mistakes: A Guide for Businesses
Learn how to identify, correct, and prevent sales tax mistakes involving rates, exemptions, filings, nexus, and product classification.
Read articleSales Tax on Gift Cards and Gift Certificates
Your guide to sales tax on gift cards and gift certificates, and how to automate collection | Kintsugi
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