Senior Tax Analyst - Tax Advisory (Deal Teams, M&A, UK/EU Tax)

Amentum is a global leader in advanced engineering and innovative technology solutions, trusted by the United States and its allies to address their most significant and complex challenges in science, security and sustainability. Our people apply undaunted curiosity, relentless ambition and boundless imagination to challenge convention and drive progress. Our headquarters are located in Chantilly, Virginia, we have approximately 50,000 employees in more than 70 countries across all 7 continents.

The Senior Tax Analyst - Tax Advisory will report to the Senior Director, Tax Advisory and will be responsible for assisting with Amentum’s tax research, planning, controversy, M&A, and other special projects. This individual contributor role will be instrumental in furthering Amentum’s best-in-class tax function and is a great opportunity for someone who enjoys working in an extremely dynamic, diverse, and fast-paced environment. US Citizenship is required. This is a local-remote-telework role, candidates must live within driving distance to one of our Amentum offices in Northern-Virginia, Fort Worth-Texas, or Oak Ridge-Tennessee.

Main Responsibilities:

- Support a broad range of domestic and international tax advisory projects, including financing transactions and cash repatriation, legal entity restructurings, withholding and indirect tax matters, and tax support for M&A transactions.

- Perform technical tax research and support tax planning, modeling, and structuring projects.

- Support our U.S. research & development tax credit claims and documentation.

- Support business development activities, including researching applicability of tax exemptions available to Amentum under bilateral defense-type agreements, such as Status of Forces Agreements (“SOFA”).

- Support tax audits and controversies in U.S. federal, state, and foreign jurisdictions, including direct and indirect tax matters, including gathering and validating data for audit requests, drafting audit responses, etc.

- Monitor and analyze federal, state, and foreign legislative, regulatory, and judicial developments.

- Assist with documenting key tax positions, risks, planning analyses, and intercompany agreements.

- Work with and provide tax support to internal stakeholders, including Legal, Business Development, Contracts, and Treasury teams.

Knowledge, Skills and Abilities:

- Work with and provide tax support to internal stakeholders, including Legal, Business Development, Contracts, and Treasury teams.

- Proficient in Microsoft office applications including Excel, Word and Power Point.

- Work effectively with other team members in carrying out assignments. Positive attitude and dependable team player with strong attention to detail.

- Ability to analyze complex data from various sources to provide insights.

- Highly organized with the ability to efficiently and accurately manage competing priorities and internal and external deadlines.

Main requirements:

- Typically, 5+ years of relevant experience in a public accounting firm and/or multi-national public company with a JD, CPA and Bachelor’s degree in relevant field; or 3+ years relevant experience with Masters degree years.

- US Citizenship is required to apply.

- This is a local-remote-telework role, candidates must live within driving distance to one of our Amentum offices in Northern-Virginia, Fort Worth-Texas, or Oak Ridge-Tennessee.

Compensation Details:
Budget 130K - 140K
The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.

Benefits Overview:
Our health and welfare benefits are designed to support you and your priorities. Offerings include:

- Health, dental, and vision insurance

- Paid time off and holidays

- Retirement benefits (including 401(k) matching)

- Educational reimbursement

- Parental leave

- Employee stock purchase plan

- Tax-saving options

- Disability and life insurance

- Pet insurance

Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

Original Posting:
11/11/2026 - Until Filled Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed,  marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at  Labor Laws Posters .