Tax Accountant/ Ksiegowy/ Ksiegowa ds. Podatkow

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For our team in Krakow we are seeking a Tax Accountant/ Ksiegowy/ Ksiegowa ds. Podatkow. The selected candidate will be employed by Critical Mission Solutions Sp.

z o. o. , part of Amentum.

The Tax Accountant will play a crucial role in supporting the Tax department in the day-to-day tax-related and accounting activities. The individual will work closely with the finance team and assist with the UK tax compliance, tax reporting and related matters. This is a great opportunity to be an instrumental contributor in furthering Amentum’s best-in-class tax function and for someone who enjoys working in a dynamic, diverse, and fast-paced environment.

Main responsibilities: Preparing corporate income tax return packages and associated calculations / workpapers in assigned jurisdictions. Assist with preparation and understanding of VAT and GST/HST Returns. Assist with quarterly and year-end tax provision workings, and preparing monthly tax journal entries, both locally and for Group Reporting.

Preparing Tax Balance Sheet reconciliations. Assist with calculating and making corporate income tax payments. Assist with monthly tax cashflows and forecast.

Work closely with Finance/Accounting teams to assist with tax related matters for statutory financial statement filings and audit Assisting with coordination and preparation of the UK’s Research and Expenditure Credit Maintain tax working papers, files and trackers. Assist with HMRC queries or other tax related queries. Assist with internal and external audit queries Requirements: A Degree in Accounting, Finance or a related Business Degree Part Tax or Accounting qualified (ATT/ACCA/ACA) is a bonus but not essential Knowledge of Accounting GAAP – IFRS, US GAAP.

###skills### Positive attitude and dependable team player with strong attention to detail We Offer International working environment and unique company culture fostering individual career growth and work-life balance Personal development opportunities and training in industry-leading tools Friendly and supportive team atmosphere Participation in global projects and process improvements Full-time employment contract with competitive salary

###Benefits### package including medical care, life insurance, My Benefit cafeteria with co-financing for sports activities, employee wellbeing support program Flexible working hours (start between 7:30–10:00) Short Fridays (Monday to Thursday we work 8,5h. Friday is a 6-hour workday) Hybrid or stationary working model — based on your preference Modern office in an attractive location Our Commitment to Inclusion We know that if we are inclusive, we’re more connected — and if we are diverse, we’re more creative.

We welcome people for who they are, regardless of age, disability, gender identity or expression, marital status, mental health, race, faith or belief, sexual orientation, socioeconomic background, or family status. Compensation Details: Information regarding the salary for this position will be shared at later stages of the recruitment process, in a way that ensures transparent and well-informed negotiations.

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: 05/29/2026 - 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.

###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.

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You can also search for a list of our current job openings and see if there are any new positions that might be a good fit for you. Thank you for continued interest in employment with Amentum. For more than 100 years, Amentum has tackled the world’s toughest challenges to deliver agile and steadfast solutions to the U.

S. government and its allies. With more than 50,000 employees on all seven continents and in more than 60 countries, Amentum delivers a broad range of operational support services to meet the critical needs of our clients.

Our headquarters are in Chantilly, VA. Find us online at https://www. amentum.

com/ If you need a reasonable accommodation for any part of the employment process, please contact us by email at TAOps@amentum. com and let us know the nature of your request and your contact information. Requests for accommodation will be considered on a case-by-case basis.

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