RMMG and IAS updated for 2026: what changes and how to ensure ERP compliance

New legal updates have recently been published that directly affect the reference values used in payroll processing for 2026. These changes are particularly relevant for companies, Human Resources departments and finance teams, as they affect the calculation of salaries, social benefits and tax treatment.

What are the main updates?

Guaranteed Minimum Monthly Wage (RMMG)

The Guaranteed Minimum Monthly Wage has been updated to 920.00 €, under Decree-Law no. 139/2025.
This new amount must be reflected in employment contracts and in the payroll runs it applies to from 2026.

Social Support Index (IAS)

The Social Support Index (IAS) now stands at 537.13 €, under Ordinance no. 480-A/2025/1, with effect from 1 January 2026.

The IAS is used to calculate a range of social benefits, legal limits and tax benefits, including specific regimes such as IRS Jovem (the youth personal income tax scheme), making it essential to update it correctly in management systems.

Update to the IRS tables

The IRS (personal income tax) withholding tables must be updated in accordance with the Order of 5 January 2026 issued by the Office of the Secretary of State for Tax Affairs, which approved the new tables applicable to employment income and pensions of residents in mainland Portugal, ensuring correct tax treatment and compliance with legal obligations in payroll processing.

The impact on ERP systems

To ensure legal compliance in 2026, it is essential that the ERP is correctly updated and configured, ensuring:

• Correct salary processing
• Application of the new legal reference values
• Tax and employment law compliance
• Reduced risk of calculation errors or non-compliance

In some cases, these updates can be applied automatically; in others, configuration adjustments may be needed, depending on the solution and the setup adopted by the company.

Openlimits keeps track to ensure compliance

At Openlimits, we continuously monitor the legal and regulatory changes that affect management systems, ensuring that the ERPs we support remain aligned with current legislation.

Our team is available to help with:

• Validating and updating the legal parameters in the ERP.
• Answering questions about the impact of these changes.
• Ensuring rigorous, legally compliant payroll processing.

👉 Talk to us and make sure your ERP is ready for 2026.

Written by:
Openlimits

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