We hope that all is well with you, and that you and your family are keeping well through these very difficult times.
As part of the fiscal measures introduced by the Spanish government to help alleviate the financial problems caused by COVID-19, autonomos who are unable to pay the tax due from their 2020 Q1 tax declarations then you can defer payment of the tax for up to six months, with the first three months being interest free.
The option to defer payment is via the usual online form on the Agencia Tributaria website www.aeat.es under the section Aplazamiento de Deudas, selecting Presentar Solicitud.
The filing deadlines are for 2020 Q1 are 20th April for negative/ zero returns and 15th April where tax is due.