William Sejr

Partner, International Tax and Transaction Services, EY Denmark

Seasoned tax professional. Trusted advisor.

William is a Partner in the transaction tax team in Denmark. He has 15 years of experience in tax advisory, having a strong track-record for solving complex tax issues.

William specializes in transaction tax matters handling due diligence and tax structuring exercises in complex M&A transactions, in particular involving private equity clients and large multinationals.

William holds an LLM from Aarhus University. Before joining the EY organization, he practiced as a lawyer with a Copenhagen law firm, having been a member of the Danish Bar Association from 2014 to 2019.

How William is shaping the future with confidence

William brings clarity and confidence to a rapidly changing tax and transactions landscape by helping clients make sound decisions when it matters most.

With more than 15 years of experience in tax advisory, he empowers clients to make confident decisions in fast‑moving deal environments while staying anchored in responsible governance.

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