Nexus Monitoring
Track when your business may need to register, collect, and file sales tax in additional states.
- Economic nexus threshold support
- State-by-state compliance visibility
- Designed for growing online sellers
For Ecommerce Merchants
Sales tax automation software for online businesses.
Track nexus, register in new states, calculate tax, prepare filings, and manage sales tax compliance from the systems your business already uses.
Merchant Compliance
Run sales tax from your source data, not scattered spreadsheets.
- Nexus monitoring and state registration support
- Shopify, Amazon, WooCommerce, Stripe, Square, CSV, Excel, and PDF inputs
- Filing-ready reports prepared for review
- Sales tax filing and confirmation tracking
- State-by-state resources for growing merchants
Know where to registerMonitor nexus and supported states as sales expand.
Use real merchant dataBring in ecommerce, marketplace, billing, CSV, Excel, and PDF data.
Prepare filings fasterTurn source reports into filing-ready numbers.
Keep proof organizedStore confirmations and filing records by state and period.
Built for operatorsStay compliant without becoming a sales tax expert.
Sales Tax Automation
One workflow for nexus, registrations, calculations, and filings.
AtomicTax helps merchants replace manual sales tax work with a structured compliance workflow that starts from the sales data they already have.
State Registration
Get help registering for state sales tax accounts before collection and filing work begins.
- Registration support by state
- Useful for new nexus exposure
- Clear scope before filing starts
Data Source Intake
Use ecommerce, marketplace, billing, API, CSV, Excel, and PDF data to prepare filing numbers.
- Shopify, Amazon, WooCommerce, Stripe, Square, and more
- File support for messy exports
- Filing-ready report preparation
Filing Support
Prepare, review, file, and keep confirmations organized across the states where you are registered.
- Standard sales tax filing support
- Confirmation archive
- State filing calendar visibility
Why Merchants Switch
Sales tax gets harder as channels, states, and reports multiply.
1
Your sales data lives everywhere
Shopify, Amazon, WooCommerce, BigCommerce, Stripe, Square, CSV files, Excel sheets, and PDFs all describe pieces of the same tax picture.
2
Nexus rules keep changing
New states can become relevant as order volume grows, creating registration, collection, and filing decisions.
3
Filing portals take time
Filing work can turn into repetitive portal entry, manual report cleanup, and confirmation hunting.
4
AtomicTax keeps the workflow together
Track obligations, prepare filing reports, submit approved returns, and keep records organized by state and period.
Data Sources
Work from the platforms and reports your business already uses.
AtomicTax supports the practical reality of merchant sales tax: some data comes from storefronts, some from marketplaces, some from billing systems, and some from exported files.
Shopify
Amazon
WooCommerce
BigCommerce
Stripe
Square
CSV
Excel
PDF
StorefrontsShopify, WooCommerce, BigCommerce, Wix exports
MarketplacesAmazon and marketplace sales reports
BillingStripe, Square, and subscription summaries
FilesCSV, Excel, PDF, and merchant-provided reports
Pricing
Simple pricing for sales tax filing work.
$45per filing
Pay per standard state filing. Add state registration support when your business expands into a new state.
- $45 per standard sales tax filing
- $99 per state registration
- No monthly platform fee for standard filing support
- Filing calendar and confirmation archive
- State-by-state resources for operators
Cleanup projects, complex filings, and larger multi-state portfolios can be quoted separately.
Merchant Fit
Built for ecommerce and online businesses that need a clearer sales tax workflow.
AtomicTax is designed for operators that need help turning sales data into compliance actions across multiple states.
Ecommerce
Marketplaces
SaaS and subscriptions
Multi-state filings
Resources
Sales tax guides for merchants and operators.
Use our educational library to understand nexus, permits, state registrations, filing calendars, and sales tax rates.
- Sales tax filing guides
- State-by-state references
- CSV, Excel, and PDF filing explainers
- Ecommerce sales tax compliance articles
U.S. Sales Tax Guide
State-by-state overview of nexus, registration, filing cadence, and compliance basics.
Texas Sales Tax Permit for Ecommerce
When online sellers need a Texas sales tax permit and what to prepare.
File Sales Tax From Data Sources
Use platform exports and reports to prepare sales tax filings.
Get Started
Talk through your merchant sales tax workflow with AtomicTax.
Bring your sales channels, registered states, and current report process. We will map how AtomicTax can support your compliance workflow.