Opinion of Advocate General Wathelet delivered on 7 September 2016.#Alphonse Eschenbrenner v Bundesagentur für Arbeit.#Request for a preliminary ruling from the Landessozialgericht Rheinland-Pfalz, Mainz.#Reference for a preliminary ruling — Freedom of movement for workers — Article 45 TFEU — Regulation (EU) No 492/2011 — Article 7 — Equal treatment — Frontier worker subject to income tax in the Member State of residence — Benefit paid by the Member State of employment in the event of the employer’s insolvency — Detailed rules for the calculation of the insolvency benefit — Notional taking into account of the income tax of the Member State of employment — Insolvency benefit lower than the previous net remuneration — Bilateral convention for the avoidance of double taxation.#Case C-496/15. Opinion of Advocate General Wathelet delivered on 7 September 2016