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Best Tax Engine Software in 2026

Tax engine software can be compared by the kinds of transactions and tax coverage it supports. Look at real-time calculation, tax types, and tax jurisdictions, then consider API access and commerce connectors in relation to your systems. Exemption certificates and transaction limits add useful points of comparison, while free-plan availability and paid-from pricing help frame costs. Vatstack, Zamp, and Kintsugi are among the entries. Use the listed criteria to assess which options match the tax rules, integrations, and transaction scale relevant to your workflows.

28 apps
Research read 23 Sept 2026
How the order is worked out

1

OpenSalesTax

Free plan Open source APILinuxMac+2

OpenSalesTax provides a self-hostable sales-tax API with jurisdiction breakdowns and configurable access modes.

8.9 Free plan Visit site
2

Kintsugi
by Kintsugi
Free plan AndroidAPIiPhone+1

Choose Kintsugi if you need sales tax exposure monitoring or automated US registration and filing, with a free plan for monitoring and audits.

7.4 Free plan · paid from $75 Visit site
3

Numeral
by Numeral
Free plan APIWeb

Choose Numeral if your business needs tax registration, sales tax calculation, or automated returns, with a free plan for nexus monitoring.

7.1 Free plan · paid from $75 Visit site
4

ShipVAT

Free plan APIWeb

ShipVAT pairs tax calculations with rate lookups, validation, compliance reports, and developer tools. The free tier has a 100-call monthly limit; Pro raises that to 50,000 calls for $49 per month.

7.0 Free plan · paid from $49/mo · 3-day trial Visit site
5

Cbox Tax

Free plan Self-hosted

Choose Cbox Tax if you are building with Laravel and need the listed tax rules and jurisdictions in a self-hosted package.

6.8 Open source Visit site
6

VAT Engine

Free plan APIWeb

VAT Engine offers date-aware VAT calculations and connected records for ecommerce and finance workflows.

6.7 Free plan Visit site
7

Vatstack

Free plan APIWeb

Vatstack brings VAT rate lookup, customer-location checks, tax calculations, number validation, and reporting into an API-based service.

6.7 Free plan · paid from $15/mo Visit site
8

Zamp
by Zamp
Free plan API

6.5 Pricing on request · 30-day trial Visit site
9

ONESOURCE Determination
by ONESOURCE Determination
Paid APILinuxSelf-hosted+2

ONESOURCE Determination combines tax calculations, integrations, and global tax content for businesses with indirect-tax needs. Request a demo and pricing details to assess fit.

5.8 Pricing on request Visit site
10

AkuCalc

Paid API

Choose AkuCalc if your business needs sales tax calculations within ERP, ecommerce, billing, or custom systems, with address-based calculations and configurable taxability rules.

5.7 Pricing on request Visit site
11

Avalara AvaTax
by Avalara AvaTax
Paid APIWeb

AvaTax combines tax calculation, filing, and business-system connections, with plans priced by state or usage depending on the option.

5.7 From $69/mo Visit site
12

Avalara Property Tax

Paid APIWeb

Avalara Property Tax offers separate products for lower-volume personal-property returns and broader enterprise tax management.

5.7 Pricing on request Visit site
13

VATCalc Calculator

Free trial APIWeb

VATCalc Calculator combines tax determination with mapping choices, exchange formats, and integrations for business systems.

5.7 Pricing on request Visit site
14

Anrok
by Anrok
Paid API

Anrok combines tax calculation, registration, and automated filing in an API service. Businesses should check which Starter category and market count apply before choosing a plan.

5.6 From $50/mo Visit site
15

CCH Tagetik
by CCH Tagetik
Paid Self-hostedWeb

Consider CCH Tagetik if your organization needs the listed budgeting, forecasting, scenario modeling, workforce planning or consolidation capabilities in a paid product.

5.6 Pricing on request Visit site
16

CereTax

Paid APIWeb

Choose CereTax if your business needs jurisdiction-aware tax calculations, configurable rules, and connections to billing or ERP systems.

5.6 Pricing on request Visit site
17

CCH SureTax
by CCH SureTax
Paid API

CCH SureTax brings tax calculation, nexus monitoring, ERP integration, and return services into one platform.

5.5 Pricing on request Visit site
18

Prophit.ai Sales Tax Engine

Paid APIWeb

The engine focuses on transaction-level determination, with review records and checks that prevent guessed results in specified cases.

5.4 From $99/mo · 30-day trial Visit site
19

Complyt

Paid APIWeb

Choose Complyt if your business needs transaction tax calculations, nexus monitoring, or exemption management through an API. Its Xero integration can calculate line-level US sales tax.

5.3 Pricing on request Visit site
20

Sovos Tax Determination
by Sovos Tax Determination
Paid APIWeb

Sovos combines real-time tax calculations with exemption-document checks and connections for business systems. Pricing and user-access setup require direct contact with Sovos.

5.3 Pricing on request Visit site
21

Quaderno
by Quaderno
Paid API

Quaderno combines tax calculations, registration, and automated filing with API access.

5.2 7-day trial Visit site
22

Sphere

Paid API

Sphere focuses on programmatic tax operations across three listed tax types.

5.1 From $100/mo Visit site
23

Stripe Tax

Paid API

Stripe Tax covers calculation, collection, reporting, registration, and filing workflows for many business models. Review the contract terms and allowance limits for the tier you need.

5.1 Visit site
24

TaxCloud
by TaxCloud
Paid API

TaxCloud combines API access with sales tax calculation, registration, and automated returns support.

5.1 30-day trial Visit site
25

TaxJar
by TaxJar
Paid API

TaxJar brings sales tax calculation, registration, and automated filing together with API access.

5.1 From $39/mo · 30-day trial Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

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