Overview

Provided by Thomson Reuters, Determination calculates sales tax, use tax, GST, VAT, and excise tax. Its content covers rates, taxability, and calculation logic across more than 205 countries and territories and over 60,000 tax jurisdictions. That reach matters for businesses whose transactions cross borders or involve varied tax rules; it is likely more than a small, domestic operation needs.

Calculations can connect to ERP, finance, billing, e-commerce, point-of-sale, and payment systems. Pre-built and custom integrations let organizations work with different system environments, while the cloud engine and edge option address different deployment needs. Determination Anywhere can support business-specific security and data-residency requirements while synchronizing with the cloud tax engine.

Key features

Real-time tax content: Rates, rules, and calculations update automatically, without downtime. This reduces the need for tax teams to keep rules current by hand, though it does not remove the need to manage compliance processes.
Scale and response: The product says it can calculate tax for 10 million transactions per hour, with response times of 40 milliseconds per transaction. Automatic synchronization with the cloud engine supports high-volume processing, making capacity a central strength for large transaction operations.
Integration breadth: Pre-built integrations cover more than 60 financial systems, including SAP, Oracle, and Microsoft Dynamics 365 for Finance and Operations. Custom integrations and API offerings extend connection options, useful when a business's systems do not fit a standard connector.
Compliance and audit support: Reporting and analytics cover compliance, reconciliation, audit defense, and data analysis, with production-ready and custom reports. Certificate Manager centralizes exemption certificates with reminders, reporting, customizable email templates, and a customer portal. These features address several recurring tax-workflow tasks rather than calculation alone.
Industry and assurance: Specialized offerings cover oil and gas, retail, manufacturing, and technology. Automated calculations aim to reduce audit-triggering mistakes; processes are backed by SSAE 18 and ISAE 3402 certifications, and ONESOURCE is stated to be SOC 1 and SOC 2 certified annually.
Support: ONESOURCE with CoCounsel provides real-time, chat-based answers to product questions, and users can contact a representative. The production-environment load-testing restriction is significant for implementation teams: load tests are permitted in pre-production only, with prior written notice and an agreed schedule.

Pricing

ONESOURCE Determination uses custom pricing. There is no free plan, and prospective buyers must contact sales; a free demo can be requested. This sales-led route makes sense for organizations whose requirements span jurisdictions, systems, and deployment choices, but it offers no self-serve way to judge cost before engaging.

The single named plan, ONESOURCE Determination, covers sales tax, use tax, GST, VAT, and excise tax, with sales-tax and real-time calculation support, commerce connectors, and exemption certificates. No lower-priced tier or free allowance is offered, so smaller teams cannot trade breadth for a simpler, cheaper package.

Platforms

Supported platforms are API, Linux, self-hosted, web, and Windows. Combined with the cloud engine and edge-computing option, this range can suit businesses with varied infrastructure and data-residency needs. It is a more flexible deployment footprint than a web-only tax tool, but the appropriate configuration will depend on the organization's requirements.

Who it's for

Determination is aimed at business tax teams that need to calculate indirect tax across many jurisdictions and connect the results to operational systems. Its volume claims and specialized offerings make it a stronger fit for larger or more complex operations, especially in oil and gas, retail, manufacturing, and technology. A team needing only a basic tax calculation for one channel is unlikely to benefit from its full breadth.

Pros and cons

Pros: Extensive jurisdictional reach. Coverage across more than 205 countries and territories and over 60,000 jurisdictions supports complex global tax operations.
Pros: Broad connection and deployment choices. More than 60 pre-built financial-system integrations, custom integrations, API access, and edge computing can accommodate varied business environments.
Pros: Beyond calculation. Reporting, analytics, and centralized exemption-certificate management support compliance and audit workflows around the tax engine.
Cons: No self-serve pricing or free tier. Buyers must request custom pricing, and there is no free plan to evaluate on an ongoing basis.
Cons: Production load testing is restricted. Teams must use pre-production for load tests and arrange the schedule in advance, which can constrain implementation validation.

Alternatives

For a lighter VAT-focused starting point, LOVAT has a free plan with one data-import integration and a Start-up plan at 27.00 EUR per month, billed monthly, with 100 transactions. It is a better fit for teams prioritizing a low-cost entry and a small transaction allowance than for organizations needing Determination's stated global jurisdictional breadth and high-volume capacity.

Zamp offers a free 30-day sandbox for teams seeking clarity on tax exposure and a U.S. plan for audit-ready U.S. compliance while scaling. Choose it when that U.S.-centered path is a closer match than Determination's multi-tax, global scope.

GSTHero is another option for buyers comparing tax compliance tools; its entry supports API, web, and Windows platforms and includes a free plan and trial.

Avalara AvaTax may suit a buyer seeking a priced U.S. option: Core Compliance is 79.00 USD per month, billed monthly, for annual revenue below $50M and 12,000+ U.S. tax jurisdictions. Its Core Compliance + SST Services plan is 69.00 USD per month; teams should compare those stated plan terms with Determination's custom-priced global coverage.

Taxmo offers a free plan capped at 25 entries per quarter, with a VAT dashboard, calculators, invoice generation, a filing guide, and a basic Tax Savings Finder. Its Starter plan is 9 GBP per month. It is a more relevant comparison for small-scale VAT tasks than for high-volume global indirect tax.

CCH SureTax is worth considering when a buyer wants to compare technology-only, filing-and-remittance, and fully outsourced service options.

Alphatax is another paid alternative, with a free trial and API, web, and Windows platforms.

TaxBandits offers a free plan and trial; its Basic plan is 19.00 USD per month and includes unlimited pay runs with a $0 employee fee. It is a comparison for teams whose needs align with those pay-run terms rather than Determination's global tax engine.

For broader comparisons, see Tax Compliance Software and Tax Engine Software.

Verdict

Choose ONESOURCE Determination if your business needs global indirect-tax coverage, high transaction capacity, and connections across several business systems. Its combination of tax content, deployment flexibility, and compliance tooling is the main reason to choose it. Look elsewhere if you need transparent upfront pricing, a free tier, or unrestricted production load testing.

	Clarus	ONESOURCE Determination
Platforms	api	api, Linux, self-hosted, Web, Windows
Supported tax types	sales tax	sales tax, use tax, GST, VAT, excise tax
Return filing	Yes
Filing support level	assisted
Sales tax calculation	Yes	Yes
API access	Yes
Real-time calculation		Yes
Tax types		multiple
Commerce connectors		Yes
Exemption certificates		Yes

Clarus vs ONESOURCE Determination

Clarus

ONESOURCE Determination