AutomatedSales Tax Compliance from Lappa
Lappa provides comprehensive sales tax compliance solutions and automated tax management services for businesses selling across the United States, helping you navigate complex state requirements with our advanced sales tax software and ensuring full compliance in every jurisdiction where you operate.
- 50 statesCompliance coverage
- 24/7 supportExpert support available
- 100% complianceAutomated tax calculation
We track deadlines and tax rate changes for you
Sales tax compliance is difficult because deadlines, rates, and regulations vary across states — and rules constantly change at state, county, and city levels.
L’Tax solves this with automated deadline tracking and real-time tax rate monitoring. We monitor regulatory updates nationwide, automatically adjust rates, and send proactive alerts before each filing deadline. You get a clear, unified view of all sales tax obligations across the US, with timely notifications for monthly, quarterly, and annual filings — so nothing gets missed, no matter how many states you sell in.
Complete sales tax services services with L'Tax
- Automatic sales tax calculation in real-time at checkout with up-to-date rates
- Current rates and rules across all states without manual updates or maintenance
- Multi-state compliance support managing sales tax obligations across the entire United States
- Automated tax filing and declaration preparation eliminating manual report creation
- Risk reduction minimizing penalties through accurate rates and timely submissions
Lappa sales tax software include
Real-time tax calculation
Automatic rate updates
50-state coverage
Automated filing and reporting
Nexus monitoring and alerts
Platform integrations
Exemption certificate management
International tax support
Tax compliance automation with Lappa
Connect your sales channels
Integrate L'Tax with e-commerce platforms, marketplaces, and payment processors through a simple setup, enabling immediate tax compliance automation.
Analyze nexus and registration requirements
The system monitors sales activity to identify nexus based on economic thresholds and physical presence, alerting you when registration is required in new states.
Automated tax calculation and collection
L'Tax calculates accurate sales tax in real-time using current rates at state, county, and city levels, automatically collecting the correct amount.
Automated filing and remittance
We generate compliant tax returns, file them with authorities on schedule, and manage payment remittance to maintain sales tax compliance across all states.
Core elements of online sales tax compliance
Nexus thresholds monitoring across all US states
We provide comprehensive monitoring of nexus thresholds and compliance management across all 50 states with sales tax obligations.
With L’Tax, you get real-time tracking of your economic nexus status in every jurisdiction, automated alerts when you approach threshold limits requiring registration, and complete visibility into your compliance obligations nationwide. Our platform continuously monitors your sales activity against each state’s specific nexus thresholds including revenue limits and transaction counts, proactively notifying you before you trigger new obligations so you can register and remain compliant as your business grows across state lines.
Sales tax software by Lappa
An all-in-one sales tax platform by Lappa that automates US compliance, filing, and remittance.
Intelligent nexus tracking across all states
Real-time tax calculation at every transaction
Automated filing and payment management
Why choose L'Tax as your sales tax services
- Full automation of sales tax compliance from calculation through filing and payment
- Real-time rate updates across all 50 states without manual maintenance
- Automated nexus monitoring with proactive alerts for new registration requirements
- Direct integrations with Shopify, WooCommerce, Amazon, and other major platforms
- Transparent, scalable pricing
Competitors
- Manual tax calculation requiring constant rate updates and spreadsheet management
- Manual nexus tracking with high risk of missing registration triggers
- Time-consuming filing processes requiring manual data entry for each state
- Limited or no integration capabilities requiring disconnected workflows
Seamless sales tax software integration





Learn more about sales tax compliance
Tax compliance automation best practices
Expert insights on implementing tax compliance automation including how to integrate with existing systems, validate calculation accuracy, manage exemption certificates, and ensure data security throughout the compliance process.
read moreUnderstanding nexus thresholds by state
Detailed breakdown of economic and physical nexus thresholds in every state including revenue limits, transaction counts, marketplace facilitator rules, and how to monitor your exposure as you grow across jurisdictions.
Complete guide to sales tax compliance
Comprehensive overview explaining sales tax compliance requirements including nexus determination, registration processes, rate calculation methods, filing procedures, and best practices for maintaining compliance across multiple states.
read more
FAQ about sales tax compliance
Sales tax compliance refers to the complete process of properly collecting, reporting, and remitting sales tax to appropriate state and local authorities according to all applicable laws and regulations. It encompasses determining where you have nexus and must register, calculating correct tax amounts on every transaction, collecting tax from customers, maintaining accurate records, filing periodic returns on schedule, and remitting collected taxes to authorities by deadlines. Proper sales tax compliance is critical because failures result in significant penalties, interest charges on unpaid taxes, potential audits, legal issues, and reputational damage. States are increasingly aggressive about enforcement, using data sharing and sophisticated analytics to identify non-compliant businesses, making professional compliance management essential rather than optional.





