coeficiente de atualização

The figure by which rent under an existing contract may be raised once a year. It is based on inflation: INE takes the average change in the consumer price index, excluding housing, over the twelve months to August and publishes it. For 2026 the coefficient was 2.24%; for 2027 it is 2.56%, so a rent of €1,000 becomes €1,025.60. The final figure is published in the Diário da República by 30 October, and only after that may the landlord announce an increase, which takes effect 30 days after the notice.