ONESOURCE Determination vs Zamp

ONESOURCE Determination9.3Visit Zamp8.9Visit

Higher score ONESOURCE Determination #2 in Tax Engine Software 9.3/10 Pricing on request ✓ 3 of 4 features Visit site

vs

Zamp #5 in Tax Engine Software 8.9/10 Pricing on request · 30-day trial Free trial✓ 1 of 4 features Visit Zamp

• ONESOURCE Determination fits best

  Global enterprises needing maximum tax coverage

• Zamp fits best

  U.S. businesses wanting managed tax compliance

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature	ONESOURCE Determination 9.3/10 Visit ↗	Zamp 8.9/10 Visit ↗
At a glance
Editor score	9.3	8.9
Ranking	#2 in Tax Engine Software	#5 in Tax Engine Software
Best for	Global enterprises needing maximum tax coverage	U.S. businesses wanting managed tax compliance
Pricing model	Paid	Paid
Starting price	Pricing on request	—
Free plan	Not checked yet	—
Free trial	—	30 days
Deployment	Cloud	Cloud
Platforms	Web	Web
Integrations	10 integrations	37+ integrations
Built for	Mid-market, Enterprise	Small business, Mid-market
Features ONESOURCE Determination 3/4 · Zamp 1/4
Real-time calculation	✓ (best)	Not checked yet
API access	Not checked yet	✓ (best)
Commerce connectors	✓ (best)	Not checked yet
Exemption certificates	✓ (best)	Not checked yet
Specs
Tax jurisdictions	Not checked yet	Not checked yet
Transaction limit	Not checked yet	Not checked yet
Tax types	Multiple	Not checked yet
Our review
Pros	Covers more than 205 countries and territories Supports more than 60,000 global tax jurisdictions Handles up to 10 million transactions per hour	13,000+ U.S. jurisdictions with rooftop-accurate calculations Automates nexus monitoring, registration, filing, and remittance Supports 15 accounting, commerce, ERP, marketplace, and billing integrations
Cons	Pricing requires contacting a sales representative Plan-level transaction limits are not published Its broad scope may exceed narrower domestic tax needs	Plan pricing requires contacting sales The API sandbox is rate-limited and limited to 30 days Canadian tax coverage requires the U.S. + Canada plan
Our verdict	ONESOURCE Determination is a cloud-based indirect tax engine from Thomson Reuters for growing companies and large corporations. It automates sales, use, GST, VAT, and excise tax calculations across more than 205 countries and territories,… Read the review →	Zamp is a managed sales tax compliance platform for growing digital businesses, including e-commerce, SaaS, and digital services companies. It combines rooftop-accurate tax calculation, real-time address validation, product-level… Read the review →

Strengths and trade-offs

• ONESOURCE Determination — where it wins

  • Covers more than 205 countries and territories
  • Supports more than 60,000 global tax jurisdictions
  • Handles up to 10 million transactions per hour

  Where it doesn't

  • Pricing requires contacting a sales representative
  • Plan-level transaction limits are not published
  • Its broad scope may exceed narrower domestic tax needs

• Zamp — where it wins

  • 13,000+ U.S. jurisdictions with rooftop-accurate calculations
  • Automates nexus monitoring, registration, filing, and remittance
  • Supports 15 accounting, commerce, ERP, marketplace, and billing integrations

  Where it doesn't

  • Plan pricing requires contacting sales
  • The API sandbox is rate-limited and limited to 30 days
  • Canadian tax coverage requires the U.S. + Canada plan

• ONESOURCE Determination9.3/10 · Pricing on request

  A high-capacity global tax engine with broad coverage and contact-sales pricing.

  Visit siteFull verdict →
• Zamp8.9/10 · Pricing on request · 30-day trial

  A managed tax engine for digital businesses that need U.S. compliance coverage and automation.

  Visit ZampFull verdict →