Hi there,
Have you been paying your monthly Autonomo payment? It is correct that you need to do quarterly tax declarations. If any are late you will receive a fine that does increase the the longer you leave it unpaid.
Thinking you need to speak to someone and get it sorted ASAP. I have a good accountant who I'm sure would give you the proper advice. He is English if you want his contact details I can pm them to you.
D
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