Overview

Zamp covers sales tax and Canadian GST, HST, PST, and QST across 13,000 jurisdictions. It combines API-based calculations with registration, automated filing, and operational support, with customers able to choose between done-for-you and done-with-you handling. That range is useful for teams that want to delegate compliance or retain involvement, but it may be more service than a business seeking only a tax calculation endpoint needs.

Calculations use a customer’s precise building address and geospatial coordinates. Integrations include Adobe Commerce, BigCommerce, NetSuite, Shopify, Stripe, WooCommerce, and Xero. Multi-entity support and a centralized dashboard help organize work across entities, while dedicated account management and tax specialists provide human support. More than 1,200 finance and accounting teams have saved thousands of hours with Zamp. AICPA SOC 2 compliance is in progress, so organizations requiring completed SOC 2 compliance should account for that status.

Key features

Zamp’s scope extends beyond tax calculation. It prepares and submits returns, remits payments directly by ACH, and monitors state portals for notices. It classifies notices, responds, resolves issues, and archives them. Keeping these tasks in one service can reduce handoffs between an API provider and internal compliance staff; teams that need only sales tax calculations may not benefit enough to justify the broader service.

The free tier provides nexus assessment, taxability review, expert consultation, and API sandbox access. The sandbox is production-grade but rate-limited, preloaded with remote-seller state registrations, and automatically cleaned up after 30 days. It is useful for evaluation and development, but its preset data and rate limits constrain how well it can represent a live deployment.

Zamp says billing has no per-transaction fees or surprise invoices, a useful distinction for teams concerned about usage-based cost swings. It also offers both U.S.-only and U.S.-plus-Canada coverage. Support from tax professionals, former auditors, and senior tax specialists adds expertise alongside the software.

Pricing

Zamp is a paid service with a free tier and 30-day trial. Its published Free plan is free and includes a 30-day sandbox, fitting teams that want to assess exposure or explore the API before adopting paid compliance coverage. That sandbox is rate-limited and its registrations are preloaded, so it is not an unrestricted production environment.

The U.S. plan has custom pricing and combines rooftop-accurate calculations, nexus monitoring and registration, automated filing and remittance, notice management, and dedicated U.S. tax expertise. It suits teams scaling U.S. compliance who value operational coverage as well as calculations. The U.S. + Canada plan also has custom pricing; it adds Canadian GST/HST/PST/QST calculations, registrations, filing and reporting, and cross-border tax expertise. That broader plan is the more relevant fit for businesses with obligations in both countries, though neither plan provides a published price for straightforward comparison.

Assess and diagnose is a custom-priced, one-time option covering nexus assessment, product taxability assessment, historical liability exposure analysis, expert consultation, and an API sandbox. It is aimed at teams seeking a defined assessment rather than ongoing compliance. The free plan offers a lower-commitment starting point, but does not include the paid plans’ filing, remittance, registration, and notice-management package.

Platforms

Zamp is available via API, with integrations for Adobe Commerce, BigCommerce, NetSuite, Shopify, Stripe, WooCommerce, and Xero. That makes it relevant to teams connecting tax workflows to commerce, payment, or accounting systems, though an API-centered setup is less suited to organizations looking for a standalone web platform.

Who it's for

Zamp is a strong candidate for finance and accounting teams managing multiple entities, growing nexus obligations, or U.S. and Canadian filings who want calculations and operational compliance together. Its done-for-you and done-with-you models accommodate different levels of internal involvement. Smaller teams that only need checkout calculations, or buyers who require completed AICPA SOC 2 compliance, should look elsewhere.

Pros and cons

Pros

Broad compliance coverage: registrations, automated filing, ACH remittance, and notice resolution extend beyond calculation.
Flexible service model: done-for-you and done-with-you options let teams choose how much work to delegate.
Free evaluation tools: nexus assessment, taxability review, expert consultation, and a 30-day API sandbox offer a practical starting point.
Geospatial calculations and integrations: precise address inputs and connections to commerce and accounting platforms support established workflows.
No per-transaction billing fees: predictable billing avoids a transaction-fee component.

Cons

Custom pricing for ongoing coverage: buyers cannot compare the U.S. and cross-border plans by published price.
Sandbox constraints: rate limits and preloaded remote-seller registrations restrict evaluation of some real-world configurations.
Certification still in progress: organizations that require completed AICPA SOC 2 compliance may not be ready to adopt.

Alternatives

Yonda Tax is worth considering for teams that want a free nexus-monitoring option with worldwide tax-liability calculations, advice, and support; Zamp is the stronger fit when managed registrations, filing, remittance, and notice handling are priorities.

AccurateTax offers sales tax calculations, usage reports, and 99.99% uptime in its Basic Service, with a Fully Managed option. Consider it when uptime and usage reporting are the deciding needs; Zamp has the more explicit combination of notice management, ACH remittance, and U.S.-Canada coverage.

Kintsugi provides a free API plan for global nexus monitoring, exposure and historical liability audits, and risk assessment. It may suit teams focused on monitoring and assessment, while Zamp better fits those seeking managed filing and remittance.

CCH SureTax offers technology-only, file-and-remit, and fully outsourced service models, making it an alternative for buyers comparing different levels of compliance outsourcing.

Taxolio charges 99.00 USD per month for managed compliance covering up to two states, with additional states at 35.00 USD per month. It suits teams whose needs fit that state-based plan and who prefer a published starting price; Zamp offers broader stated jurisdiction coverage and Canadian compliance.

Vertex e-Invoicing is an alternative for teams evaluating e-invoicing software.

Sovos Tax Determination is another paid tax determination option for teams prepared to contact the vendor for pricing.

ONESOURCE Certificate Manager is an alternative for teams considering a paid certificate-management product with API, self-hosted, web, and Windows platform support.

Browse Sales Tax Software, Tax Compliance Software, and Tax Engine Software to compare more options.

Verdict

Choose Zamp if your finance team wants sales tax calculations connected to registration, filing, ACH remittance, and notice support, particularly across U.S. and Canadian obligations. Its breadth and flexible service models are the strongest reasons to choose it; custom pricing, sandbox limits, and SOC 2 compliance still in progress are the clearest reasons to compare alternatives.

	Avalara VAT Reporting	Zamp
Free plan		Yes
Paid from		Free
Platforms	api, Web	api
VAT return filing	Yes
Free plan		No
Jurisdictions covered		13,000 jurisdictions
Supported tax types		Sales tax; GST; HST; PST; QST
Return filing		Yes
Filing support level		automated
Sales tax calculation		Yes
Tax registration		Yes
API access		Yes

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