April 2^nd will start the filing season for the Spanish Modelo 100 (IRPF), until June 31^st.
We will need all your W2 and 1099 from the US financial institutions.

The individual tax return campaign in Spain for 2019 will start on April 2^nd. We plan to download the fiscal data from all our clients before this date, so we could probably start sending you the first draft of your Spanish tax return by then. We will strictly follow the order of delivering the necessary documents of foreign earnings: W-2 and 1099 from financial institutions, K1 and the 1099-SSA from the U.S. Social Security, which are all taxable in Spain and must be included in the Modelo 100. Please remember that we will be more efficient and faster with your tax returns if you upload in our website all the documents using our secure encrypted file transfer system of our web – https://ustaxconsultants.es/upload/ –  it is easy and you will be able to follow up the uploaded documents.
Before we file your return, we will send you a draft for you to be approved. All payments to the AEAT can be done in two installments: 60% in June 30th and 40% in November 6th.