TaxJar
EcosystemSales tax automation for e-commerce, acquired by Stripe, covering US state sales tax calculation and filing.
TaxJar is a sales tax automation platform focused on US e-commerce, acquired by Stripe in 2021. It automates sales tax calculation, reporting, and filing across all US states. Its SmartCalcs API provides real-time tax rates for any transaction, and its AutoFile feature handles filing returns automatically.
The Stripe acquisition makes TaxJar a natural component of Stripe-powered UCP implementations. When merchants use Stripe as their UCP payment handler, TaxJar's tax calculation integrates directly into the payment flow without additional configuration.
TaxJar's API is well-documented and low-latency, making it suitable for the real-time calculation requirements of agent-initiated checkout.
Why This Matters for UCP
TaxJar, as a Stripe subsidiary, provides the US sales tax calculation layer for Stripe-powered UCP transactions, enabling agents to collect the correct tax in all US states without merchant configuration.
UCP Capabilities
UCP Endpoint
Ecosystem — Endpoint not yet publicly available
Integration Example
// TaxJar calculates US sales tax during UCP checkout.
// Use SmartCalcs API before finalizing the transaction.
const taxResponse = await taxjar.taxForOrder({
from_country: 'US',
from_zip: merchantZip,
from_state: merchantState,
to_country: 'US',
to_zip: shippingZip,
to_state: shippingState,
amount: subtotal,
shipping: shippingCost,
line_items: cartItems.map(item => ({
id: item.sku,
quantity: item.qty,
unit_price: item.price,
product_tax_code: item.taxCode,
})),
});
const salesTax = taxResponse.tax.amount_to_collect;Category
Tax ComplianceUCP Status
EcosystemTags
Pricing
paid
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Reviews
★★★★★4.7 (3 reviews)These are illustrative examples to show what reviews will look like. Submit your own experience below.
R. Kapoor
Platform Engineer · Jan 15, 2026
Integrated in an afternoon. Solid implementation with no unexpected edge cases in production.
J. Santos
Senior Engineer · Feb 28, 2026
Integration was straightforward. The UCP endpoint discovery works as documented and checkout completes in under 2 seconds.
M. Lee
Backend Developer · Mar 3, 2026
Works well for our use case. The documentation is accurate and the implementation matches what the spec describes.
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