The calculation platform for expat tax and shadow payroll

Certino is a cloud-based platform that produces payroll-ready expatriate tax calculations across countries, policies and providers.

Certino sits upstream of payroll and tax delivery. It receives assignment, compensation and policy inputs, applies consistent country-specific calculation logic, and outputs standardised results for payroll teams, tax providers and mobility partners to execute with confidence.

How the Certino platform works

A centralised tool for global tax calculations

Web app or API access
Standardised CSV or JSON inputs
PAYE, federal and state tax support
Hypothetical tax and gross-ups (partial or full)
Home and host social security calculations
Consistent logic across countries and providers
Payroll-ready, standardised outputs
Results returned in seconds

Certino can help you enhance your service, create new revenue streams and delight your clients

Offering an automated shadow payroll solution to your customers can give you a powerful competitive advantage.

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How Certino reshapes shadow payroll delivery

Faster delivery, lower risk, and room to scale

From disconnected systems to a single calculation layer

Certino sits upstream of payroll and tax delivery, consuming standardised inputs and producing payroll-ready outputs across countries and providers.

Faster delivery without adding headcount

Deliver accurate shadow payroll calculations in seconds, not days - without relying on spreadsheets, manual rework or specialist bottlenecks.

Consistent compliance, everywhere

Apply the same calculation logic across jurisdictions, policies and providers, reducing interpretation risk and audit exposure.

Accurate calculations, not estimates

Payroll-ready expatriate tax and shadow payroll calculations produced automatically using maintained, country-specific logic - not approximations.

New revenue without building a shadow payroll engine

Offer shadow payroll as part of your service without building, maintaining or scaling your own calculation capability.

Fits your operating model

Access Certino via web application or API, supported by onboarding, documentation and integration support designed to complement partner-led delivery.

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Technology at the core

Services where they matter

Our Technology

Purpose-built expatriate tax and shadow payroll calculation platform, designed by practitioners who run these processes at scale.
Accessed via a secure web application or enterprise-grade API, depending on how you operate.
Standardised, structured inputs and outputs to remove spreadsheet-driven interpretation.
Consistent calculation logic applied across countries, policies and providers.
Payroll-ready results returned in seconds, not days.
Built with enterprise-grade security and data protection controls.

Our Services

Structured onboarding support to get teams live quickly without disrupting existing delivery models.
Ongoing activation support to ensure you maximise the value from our automated tools
Access to our support portal and reference documentation for quick answers to your queries and to help you understand different legislative methodologies
Comprehensive technical documentation and technical support team to help you build the perfect integration with our enterprise-grade APIs
Ongoing support designed to complement partner-led delivery, not replace it.