Quaderno

Kintsugi is a next-generation sales tax compliance platform that applies AI to automate the determination, calculation, and filing process with less manual configuration than legacy solutions. Named after the Japanese art of repairing broken objects with gold, Kintsugi focuses on making sales tax compliance beautiful and low-friction for modern software companies that find existing tools cumbersome. The platform's AI engine handles economic nexus analysis across all 50 states, automatically registering for collection obligations as thresholds are crossed without requiring manual registration management. Product taxability determination uses AI to classify products and services against jurisdictional rules, reducing the manual configuration burden that makes Avalara and Vertex setup complex. Real-time sales tax calculation integrates with Stripe, Chargebee, Recurly, Zuora, and major billing platforms. AutoFile submits returns automatically in all required states, with Kintsugi handling the state DOR relationships. The compliance calendar provides forward-looking visibility into upcoming filing deadlines and payment due dates. Exemption certificate collection and management handles B2B customer exempt status documentation. The platform's modern API enables rapid integration for engineering teams at software companies. Kintsugi is positioned as the purpose-built sales tax solution for the modern software stack — less complex to implement than Avalara, more capable than manual approaches, and designed by a team that deeply understands the nexus complexity facing fast-growing SaaS and e-commerce companies.

TaxCloud is a sales tax compliance service with a distinctive success-based pricing model: rather than charging flat monthly fees, TaxCloud charges 1.1% of total taxable sales processed through the platform, capped at $10,000 per year. This transaction-based model aligns TaxCloud's costs with business revenue, making it particularly cost-effective for low-volume sellers while capping exposure for high-volume merchants. The platform provides sales tax calculation via API for real-time rate determination, integrated with major e-commerce platforms and shopping carts. TaxCloud is an Authorized Service Provider for the Streamlined Sales Tax (SST) program — a multi-state initiative enabling remote sellers to achieve compliance in SST member states at no cost when using an authorized service provider, a significant potential cost advantage. Returns preparation and filing cover all required US states and the District of Columbia. Exemption certificate management handles collection and validation of tax exemption documentation. The API is well-documented and straightforward for developers implementing tax calculation in custom e-commerce or billing systems. TaxCloud's pricing model is most advantageous for businesses with relatively low taxable sales volume or for those in SST member states where the SST program reduces or eliminates direct charges. For high-volume merchants with complex taxability questions or international requirements, the feature set is thinner than Avalara or Vertex. TaxCloud fills a useful niche as an accessible, developer-friendly sales tax compliance option with API-first architecture.

LumaTax is a sales tax compliance platform positioned for small e-commerce businesses and marketplace sellers who need affordable, straightforward multi-state filing without the complexity or cost of enterprise solutions. The platform focuses on making sales tax returns accessible for sellers who have recently crossed nexus thresholds in multiple states and need to establish compliant filing without dedicating significant resources to tax operations. LumaTax imports transaction data from major e-commerce platforms including Amazon, Shopify, WooCommerce, and Etsy, automatically mapping sales to tax jurisdictions and preparing state return forms. The filing review interface presents prepared returns clearly before submission, allowing business owners to verify amounts before LumaTax files on their behalf. Economic nexus monitoring tracks sales against state thresholds and alerts businesses when new filing obligations arise. The free tier accommodates very early-stage sellers with limited multi-state exposure, while paid tiers unlock multi-state filing and higher transaction volumes at pricing well below Avalara and TaxJar. LumaTax lacks some enterprise features — real-time tax calculation for cart integration, exemption certificate management at scale, and complex product taxability configuration — but these limitations are largely irrelevant for its target market of individual sellers and early-stage e-commerce brands. For businesses with straightforward sales tax needs that balk at $99/month TaxJar pricing, LumaTax delivers the essential filing automation at a fraction of the cost.