PAYROLL & COMPLIANCE APIS
The payroll and compliance infrastructure your platform deserves
Give your platform direct access to our payroll and compliance engine: two APIs, gross-to-net calculations and automated tax filing, working as one infrastructure layer. Build your own experience on top; we handle the complexity underneath.
GLOBAL COVERAGE
Two APIs, one infrastructure for every market you serve.
Reliable, fast, and accurate payroll calculations
BUILT FOR PERFORMANCE
- 3 day
Change cutoff
- 100%
Built for accuracy
- <500ms
API response time
WHY USE OUR API
Built for developers, trusted by enterprises
Our API is designed to make payroll integration straightforward. Comprehensive documentation, predictable responses, and automatic compliance updates mean less maintenance for your team.
Developer-First Design
RESTful API with comprehensive documentation and a full sandbox environment. Get up and running with just a few lines of code.
Real-Time Calculations
Instant gross-to-net results with every API call. No batch processing, no waiting for overnight jobs. Show your users payroll results the moment they need them.
Automatic Compliance Updates
Tax tables and regulations are updated automatically as laws change. No manual maintenance, no compliance gaps. Your integration stays current without any effort.
Integrate in days. Scale with confidence.
Flux is developer-friendly right out of the box. Comprehensive documentation, a sandbox environment, and a 24/7 knowledge base mean your team can move fast.
- 01
Book a demo
We'll walk your team through both APIs, answer every technical question, and help you identify the fastest path to go-live. You'll see exactly how Flux integrates with your platform.
- 02
Access documentation & sandbox
From day one, your developers have access to comprehensive API documentation, clear endpoint guides, and a full sandbox environment for testing before you go live.
- 03
Integrate into your platform
Connect the Flux APIs directly to your product to replace manual workflows. Flexible endpoints fit your existing stack, so you integrate without rebuilding what already works.
- 04
Go live & scale
Launch payroll and compliance for your customers and scale with confidence. Flux handles every calculation, every filing, and every regulatory update automatically, in the background, every cycle.
Know exactly what’s happening, across every client, in every cycle. Flux gives you and your clients a complete, real-time view of payroll activity: custom reports, historical analytics, and client-ready outputs, all in one place.
- Custom date ranges and controls
- Categorize for easy viewing
- Customizable, client-ready reports
- Historical analytics for trend insights
The Flux Tax Filing & Payments API tracks regulatory changes continuously and applies them automatically, so your filings stay compliant in every market, without any action from your team.
- Continuous monitoring of regulatory changes
- Categorize for easy viewing
- Automatic application of new rates and requirements
- Always-current compliance in every jurisdiction you serve
Infrastructure built for scale and accuracy
Bulk data imports
Transitioning to Flux is a breeze as we support bulk imports of employee data from various sources.
Automated filings
Flux automatically files payroll taxes and social security contributions, reducing manual work and keeping every filing on time.
Ledger & data exports
Export detailed payroll ledgers and reports to your accounting system, with clean data feeds you can reconcile across multiple clients.
DEVELOPER FIRST
Flux is built for developers who need reliability, flexibility, and speed. A 99.9% uptime SLA means your customers can count on Flux every time payroll runs. Comprehensive documentation, sandbox access, and a 24/7 knowledge base mean your team integrates fast and iterates with confidence.
- Developer-friendly API with full documentation from day one
- Sandbox environment for safe testing before go-live
- Flexible endpoints that work within your existing architecture
- 99.9% uptime SLA, because payroll can't afford downtime
- Real-time data sync across all calculations and filings
Build payroll into your platform today
Instant gross-to-net calculations
Automated tax filing & payments
14+ countries supported
<500ms response times
Sandbox environment included
Automatic compliance updates
Multi-currency support
Developer-friendly API & documentation
Instant gross-to-net calculations
Automated tax filing & payments
14+ countries supported
<500ms response times
Sandbox environment included
Automatic compliance updates
Multi-currency support
Developer-friendly API & documentation