Tax Partner - UHNW (Orange County)

Why Work at Mercer Advisors?

For more than 40 years, Mercer Advisors has been helping families amplify and simplify their financial lives by integrating financial planning, investment management, business management, tax, estate, insurance, and more, all managed by a single team. We deliver the kind of comprehensive care once reserved for only the wealthiest households.

Today, we serve over 42,800+ families across 110+ cities across the U.S. Ranked the #1 RIA Firm in the nation by Barron’s for two consecutive years, Mercer Advisors is an independent fiduciary legally bound to act in our clients’ best interests — always.*

Mercer Advisors offers a workplace that stands apart in the financial industry. More than half of our employees and client-facing professionals are women, reflecting the clients we serve. With a flexible, national footprint, we build our teams around exceptional talent — wherever they are.

Join us and help families amplify and simplify their financial lives with confidence.

• Mercer Advisors was ranked #1 for RIA firms with up to $70 billion in assets. The Barron’s top RIA ranking is based on a combination of metrics – including size, growth, service quality, technology, succession planning and others. No fee was paid for participation in the ranking, however, Mercer Advisors has paid a fee to Barron’s to use the ranking in marketing. Please see important information about the ranking criteria methodology  here .

 

 

Job Summary:

At Mercer Advisors, our purpose is to amplify and simplify our clients’ financial lives through a fully integrated family office offering. We bring together fiduciary professionals across disciplines to do the best work of their careers—as one unified team committed to doing what’s right for clients. We continue to reinvest in our people and platform so that our growth creates more opportunities for teammates and more value for clients.

Regis is Mercer Advisors’ offer designed for ultra-high net worth families with complex, multi-generational wealth. Regis clients often have the means to build their own family office, and they require a deeply integrated wealth management experience with the highest level of service, coordination, and sophistication. We are a team of world-class fiduciary professionals delivering holistic advice across investments, financial planning, estate strategy, tax strategy, and more with the aim of making every client feel like our only client.

We are seeking an exceptional Tax Partner - Regis - to serve as the lead tax advisor, strategist, and subject matter expert for our Regis families. You will lead engagements alongside senior wealth advisors and other Regis team members, with direct accountability for the tax outcomes and experience of our most complex families. This is not a support or review role—you will bring the credibility, judgment, and gravitas that UHNW families expect from their most trusted advisors.

 

Essential Job Functions for this role include:

Serve as the lead tax advisor and primary point of accountability for a select group of Regis families, maintaining and growing a book of clients with balance sheets that often exceed +$100M.

Build practical, year-round, and multi-year tax strategies tailored to each family’s goals, ownership structures, businesses, trusts, investments, charitable activities, and succession plans.

Lead and develop a select team of UHNW-focused tax professionals supporting Regis engagements, overseeing staffing, engagement economics, billing, and service quality.

Identify planning opportunities and risks arising from business transactions, concentrated positions, real estate, carried interests, equity compensation, major charitable gifts, residency changes, and cross-border exposure (foreign trusts, PFICs, GILTI, FATCA/FBAR) bringing in specialists when the issue calls for deeper expertise.

Oversee tax compliance at a level appropriate to each engagement: directly, when Mercer prepares the returns, or through active review and coordination when a family’s own CPA firm or internal tax team handles preparation.

Lead the response to significant federal and state tax notices, examinations, and controversy matters, coordinating with counsel and other specialists through resolution.

Partners with Regis wealth advisors and Mercer’s broader team — estate planning, investments, financial planning, and family office services — so tax advice is fully integrated with each family’s overall plan.

When relevant, collaborate and coordinate the tax calendar / division of responsibilities with the families outside CPAs, attorneys, trustees, investment bankers, valuation professionals, controllers, and other advisors

Support new client development through prospective client meetings and partner with Regis leadership to evolve the tax service model, team, and technology.

 

Knowledge, Skills, and Abilities:

CPA license required; advanced degree in taxation (MST/LL.M.), law degree, or comparable technical credential strongly preferred.

12–15+ years of progressive tax experience, with the majority spent advising clients with balance sheets of $25M or greater; meaningful experience with $100M+ families required.

Deep technical command of individual, fiduciary, partnership, corporate, estate, gift, and state and local taxation, including advanced planning strategies commonly used by ultra-high net worth families.

Experience identifying cross-border tax and reporting issues and working effectively with international tax specialists; direct technical expertise in every international area is not required.

Experience managing significant tax notices, examinations, and controversy matters, including coordination with tax counsel.

Meaningful experience advising entrepreneurs, business owners, executives, and multi-generational families through liquidity events, business succession, wealth transfer, and other significant transactions.

Ability to analyze complex facts, focus on what matters, and deliver clear, practical recommendations — with excellent written and verbal communication skills to explain sophisticated tax matters in plain language.

Demonstrated ability to lead and develop high-performing tax professionals and build a culture of accountability and technical excellence.

Comfort operating in a team-based, integrated advisory environment within a regulated RIA structure; experience at a family office, multi-family office, wealth management firm, or national accounting firm strongly preferred.

Unquestioned integrity and a strong commitment to confidentiality, sound risk management, and putting the client’s interests first.

Ability to travel up to 10%.

Location: This is a hybrid role with a strong preference for applicants in San Francisco, Los Angeles, and Orange County.

Work Schedule:

This professional role requires availability during standard business hours of Monday through Friday from 8AM to 5PM.  At times, the role may have early or late hours to meet business tasks and deadlines for external and internal client needs.    

All roles classified as a non-exempt are required to record working time into the timekeeping system daily at the start and end of each workday plus a 30-minute unpaid lunch period.

 

Working Conditions:

This position may be in a professional office environment or a dedicated home office workspace which is free of interruptions.  Whether position is in a dedicated office space or home office workspace, basic technology needs will be provided to satisfy position requirements.  Routinely sitting and standing for periods of time. No heavy lifting over 10 lbs.

 

Application Deadline : The initial deadline for applications is 9/14/2026. Applications submitted after this date may still be considered on a rolling basis until the position/program is filled. We encourage all interested candidates to apply as early as possible. If a final decision has not been made by the initial deadline, subsequent applications will be reviewed as they are received.

  The annualized compensation range for this role is based on factors including, but not limited to, experience, skillset, and geographic location where work is performed. The cash compensation range includes both base salary and an annual bonus. The total compensation package may include additional cash bonus amounts and other incentive compensation.

Total expected cash compensation range $212,500 — $250,000 USD

Benefits:

Mercer Advisors offers a competitive and robust benefit package to our employees.   Our benefit programs are focused on meeting all of our employees and their eligible dependents health and welfare needs. We offer the following:

Company Paid Basic Life & AD&D Insurance

Company Paid Short-Term and Long-Term Disability Insurance

Supplemental Life & AD&D; Short-Term Disability; Accident; Critical Illness; and Hospital Indemnity Insurance

Three Cigna medical plans offerings including two High Deductible Health Plans and a Traditional Co-Pay medical plan.

Kaiser Medical plans available in California

Health Savings Account (HSA) with company contributions if enrolled in either HDHP medical plan.

Two comprehensive Dental Plans

Vision Insurance Plan

Dependent Care Savings Account for child and dependent care.

14 Company Paid Holidays including a full week off at Thanksgiving.

Generous paid time off program for vacation and sick days

Employee Assistance Plan

Family Medical Leave

Paid Parental Leave (8 weeks)

Maternity benefits utilizing company paid STD, any supplemental STD, plus Parental Leave (8 weeks) to provide time for recovery, baby bonding, and enjoying your family time.

Adoption Assistance Reimbursement Program

Company Paid Concierge Services for you and your loved ones for the spectrum of caring needs for your aging parents, young children, life’s challenges and more.

401(k) Retirement Plan with both Traditional and Roth plans with per pay period match as well as an after-tax option

Pet Insurance

Personalized financial planning and guidance from Mercer Advisors professionals, offered at preferred employee pricing

We are not accepting unsolicited resumes from agencies and/or search firms for this job posting.

Mercer Advisors is an equal opportunity employer and does not discriminate on the basis of any characteristic protected by applicable federal, state, or local law. Mercer Advisors participates in E-Verify and complies with federal employment eligibility verification requirements.

If you need an accommodation during the application or hiring process, please email  PeopleTeam@merceradvisors.com . This inbox is for accommodation requests only.

For information about applicant rights, required employment notices, E-Verify participation, and state specific disclosures, please review our  Applicant Notices and Employment Rights .

If you are a resident of California, learn more about Mercer's California Consumer Privacy Policy  here . CCPA Notice at Collection

If you are a resident of Washington State, learn more about your rights under the Washington Fair Chance Act  here .