What changes with JMHZ?

The Unified Monthly Employer Report Czech Republic, usually referred to as JMHZ, introduces a new monthly reporting model for Czech employers from 2026.

For employers, the practical impact is simple: payroll data, employee registration and monthly statutory reporting need to be much more disciplined. The monthly report is no longer just a final output after payroll is closed. It depends on whether employee data is complete, correctly registered and ready on time.

Employers can also refer to the official ČSSZ user guide for JMHZ on the ePortal for technical submission guidance.

This is especially important for international employers using external payroll providers, global payroll platforms or shared-service structures. The filing may be done locally, but the responsibility for correct and timely employer reporting remains with the employer.

Who must file the monthly JMH?

The obligation to file JMH applies to employers. From 2026, any employer with at least one employee needs to understand whether and how the reporting obligation applies.

Where an employer has more than one payroll office, each payroll office files the JMH separately for the employees it covers. This matters for larger companies, branches and employers with more complex payroll administration structures.

Monthly JMH deadlines

JMH is filed monthly. The standard filing window is from the 1st to the 20th day of the calendar month immediately following the month to which the report relates.

If the 20th day falls on a weekend or Czech public holiday, the deadline moves to the next working day.

Employee registration: the part employers must not underestimate

JMHZ is not only about the monthly report. It also changes the operational pressure around employee registration. The monthly report only works if employees and their employment details are correctly registered first.

Employee registration timeline in 2026

This is a major point for global employers. If hiring data sits in Workday, an HR ticket, an email chain or a local spreadsheet for too long, payroll may not have enough time to register the employee correctly before work starts.

What does JMH include?

The monthly JMH has three core parts. Employers need to understand all three, because they connect employer-level data, insurance reporting and employee-level payroll details.

• Summary part — employer-level data, including information relevant for tax purposes.
• Insurance part — social security insurance information and employer contribution data.
• Individualized part — data relating to individual employees and individual employments.

The individualized part is where the real operational discipline sits. It means monthly reporting depends on accurate employee-level payroll data, not only on totals.

For employers, this shifts Czech payroll away from “monthly calculation plus later cleanup” toward a cleaner monthly control cycle.

Employer checklist: what to fix before it becomes painful

JMHZ is manageable if the employer has clean processes. It becomes stressful when payroll relies on late inputs, unclear ownership and manual fixes.

1. Confirm who owns Czech payroll reporting

Payroll provider? HR? Finance? Local manager? Global payroll team? Someone must own the complete chain — not just the upload.

2. Align HR and payroll cut-offs

If employees must be registered before work starts, HR and payroll cannot operate in separate timelines. New hire information must reach payroll early enough to be usable.

3. Review foreign employee onboarding

Foreign employees are the area where mismatches happen easily: names, dates of birth, identifiers, residency details, citizenship and personal data can all delay registration if not captured correctly.

4. Test employee-level payroll data

JMHZ is not only about aggregate amounts. Employers should check whether their payroll system can produce clean employee-level data for the report.

5. Build a monthly control routine

Before filing, employers should review whether all employees are registered, whether leavers are processed, whether changes are reflected and whether the monthly report makes sense.

Why this matters for global employers

Global employers often treat local payroll reporting as a local execution task. JMHZ makes that approach risky.

The employer still needs to understand the reporting calendar, registration duties, employee data requirements and payroll provider responsibilities. Outsourcing the process does not outsource the compliance risk.

The companies that handle JMHZ best will not be the ones with the fanciest payroll platform. They will be the ones with clear ownership, timely data and local Czech payroll logic under control.