ONESOURCE Determination vs Avalara AvaTax

ONESOURCE Determination9.4Visit Avalara AvaTax8.9Visit

Higher score ONESOURCE Determination #1 in Tax Compliance Software 9.4/10 Pricing on request ✓ 0 of 4 features Visit ONESOURCE

vs

Avalara AvaTax #4 in Tax Compliance Software 8.9/10 Paid ✓ 3 of 4 features Visit Avalara

• ONESOURCE Determination fits best

  Large global enterprises

• Avalara AvaTax fits best

  High-volume transaction tax calculation

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Side by side

Feature	ONESOURCE Determination 9.4/10 Visit ↗	Avalara AvaTax 8.9/10 Visit ↗
At a glance
Editor score	9.4	8.9
Ranking	#1 in Tax Compliance Software	#4 in Tax Compliance Software
Best for	Large global enterprises	High-volume transaction tax calculation
Pricing model	Paid	Paid
Starting price	Pricing on request	$699/unit/yr
Free plan	Not checked yet	—
Free trial	—	—
Deployment	Cloud	Cloud
Platforms	Web	Web
Compliance	SOC 2	SOC 2
Integrations	10 integrations	1,400+ integrations
Built for	Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features ONESOURCE Determination 0/4 · Avalara AvaTax 3/4
Return filing	Not checked yet	✓ (best)
Sales tax calculation	Not checked yet	✓ (best)
Tax registration	Not checked yet	Not checked yet
API access	Not checked yet	✓ (best)
Specs
Jurisdictions covered	Not checked yet	12000 jurisdictions
Supported tax types	Not checked yet	sales tax, consumer use tax, VAT, communications tax, occupancy and lodging tax, excise tax
Filing support level	Not checked yet	Automated
Our review
Pros	Covers more than 205 countries and 60,000 tax jurisdictions Calculates multiple tax types in real time Supports up to 10 million transactions per hour	Covers 12,000+ jurisdictions and multiple tax types REST API plus broad ERP, ecommerce, and accounting integrations Nexus, exemption, filing, reporting, and audit-readiness features
Cons	Pricing requires contact with a representative No public plan-level transaction limits are provided Designed for cloud deployment rather than on-premises use	No free plan is available Pricing varies by state, revenue tier, usage, and eligibility Advanced services and configurations may require a Custom plan
Our verdict	ONESOURCE Determination is a cloud-based indirect tax engine from Thomson Reuters for companies managing sales, use, GST, VAT, and excise tax calculations. It is aimed at mid-market and enterprise organizations, with particular relevance… Read the review →	Avalara AvaTax is a cloud-based tax determination engine for businesses calculating taxes across sales and purchasing workflows. It supports sales and consumer use tax, VAT, communications tax, occupancy and lodging tax, and excise tax.… Read the review →

Strengths and trade-offs

• ONESOURCE Determination — where it wins

  • Covers more than 205 countries and 60,000 tax jurisdictions
  • Calculates multiple tax types in real time
  • Supports up to 10 million transactions per hour

  Where it doesn't

  • Pricing requires contact with a representative
  • No public plan-level transaction limits are provided
  • Designed for cloud deployment rather than on-premises use

• Avalara AvaTax — where it wins

  • Covers 12,000+ jurisdictions and multiple tax types
  • REST API plus broad ERP, ecommerce, and accounting integrations
  • Nexus, exemption, filing, reporting, and audit-readiness features

  Where it doesn't

  • No free plan is available
  • Pricing varies by state, revenue tier, usage, and eligibility
  • Advanced services and configurations may require a Custom plan

• ONESOURCE Determination9.4/10 · Pricing on request

  A global indirect tax engine for complex, high-volume calculation needs.

  Visit ONESOURCEFull verdict →
• Avalara AvaTax8.9/10 · Paid

  A broad tax engine for businesses managing high-volume, multi-jurisdiction transactions.

  Visit AvalaraFull verdict →