The Government of Monaco has issued a communiqué on measures to support the national economy. With respect to taxation, the main measure is that companies may request a deferral of the payment of VAT, which was originally planned to be deferred by 2 months but is now being deferred by 3 months. VAT declarations are still required, with only the payment deferred.
An overview of COVID-19 economic measures can be found on the government website.