Opinion of Advocate General Collins delivered on 20 January 2022.#ACC Silicones Ltd. v Bundeszentralamt für Steuern.#Request for a preliminary ruling from the Finanzgericht Köln.#Reference for a preliminary ruling – Free movement of capital – Dividends from ‘free-float’ shares – Reimbursement of tax on income from capital paid by a non-resident company – Conditions – Free movement of capital – Principle of proportionality.#Case C-572/20.