Tax Manager/Senior Tax Manager

Old Mission•Chicago, IL

2d•Hybrid

About The Position

Old Mission is a global proprietary trading firm using technology and research to develop and execute trading strategies across asset classes. The Tax Manager/Senior Tax Manager is a hands-on role working alongside the Tax Director on tax workpapers, return reviews, technical research, compliance deadlines, and analysis supporting the firm’s tax positions. The position covers U.S. international tax, federal, state and local compliance, research and authority responses, and improvements to tax processes and technology. The role prepares and owns compliance workpapers for controlled foreign corporations and partnerships, including GILTI/NCTI, FDII/FDDEI, BEAT, Subpart F, foreign tax credits, withholding, and treaty positions. It supports tax return preparation and review, indirect tax filings, information reporting, transfer pricing, tax research and memoranda, examination responses, transaction analysis, and cross-functional tax projects. The role also helps monitor legislative, regulatory, IRS, and OECD Pillar Two developments and assess their effects on the firm. The position is onsite five days per week for the first three to six months, followed by four days in the office and one day remote. Base salary is $120,000–$170,000, with a discretionary bonus and benefits for full-time employees.

Requirements

Six to eight or more years of tax experience; public accounting experience at Manager or experienced Senior level is strongly preferred.
Hands-on technical experience in U.S. and international tax, including preparing and reviewing GILTI/NCTI, Subpart F, and foreign tax credit workpapers; conceptual familiarity alone is insufficient.
Experience preparing and independently reviewing federal and state tax returns and workpapers, preferably in financial services, partnerships, or a trading firm.
Working knowledge of indirect tax, VAT, Use Tax, or GST in a compliance setting.
CPA licensed or within one exam section of completion; an active license is strongly preferred.
Advanced Excel proficiency, including XLOOKUP, PivotTables, Power Query, and SUMIF/SUMIFS, and comfort manipulating large financial datasets.
Exceptional attention to detail and organizational discipline, with the ability to manage multiple high-stakes deadlines.
Impeccable ethics and integrity, and the ability to handle confidential and market-sensitive information.

Nice To Haves

Prior tax experience in financial services, a proprietary trading firm, hedge fund, or investment partnership.
Transfer pricing experience, including intercompany agreements and benchmarking documentation.
Exposure to the Pillar Two/OECD Global Minimum Tax framework and its interaction with U.S. GILTI rules.
Experience with SALT filings and withholding requirements for investment partnerships.
Familiarity with ASC 740 income tax accounting and quarterly tax provision work.
Experience with tax research databases such as Thomson Reuters Checkpoint, Bloomberg Tax, or CCH AnswerConnect.
Working knowledge of AI tools used for tax research, drafting, and workflow automation.
BS/BA in Accounting or Finance.

Responsibilities

Prepare and own U.S. international tax compliance workpapers and supporting schedules for the firm's controlled foreign corporations and partnerships, including GILTI/NCTI, FDII/FDDEI, BEAT, Subpart F, foreign tax credits and limitations, and foreign withholding and treaty positions.
Maintain and update CFC and partnership analyses, including tested income and loss, net deemed tangible income return calculations, and high-tax exclusion evaluations; coordinate with external advisors on foreign tax credit planning and transfer pricing strategies.
Monitor OBBBA, evolving IRS guidance, and OECD Pillar Two developments, assessing their implications for compliance and tax planning.
Support transfer pricing documentation and intercompany agreements for cross-border transactions between U.S. and foreign entities.
Prepare tax return information packages and detailed workpapers for external tax consulting firms, and independently review externally prepared federal and state returns before submission.
Support preparation and review of indirect tax filings, including VAT, Use Tax, and GST.
Own withholding and information-reporting obligations for Forms 1099, 1042-S, and 8804 for the firm and related entities.
Build and maintain the tax compliance calendar, identify upcoming deadlines, and coordinate timely completion with internal teams and outside advisors.
Research federal, state and local, and international tax issues and prepare technical memoranda for Tax Director review.
Prepare substantive responses to information document requests from the IRS and state and city taxing authorities, and maintain organized examination support files.
Monitor legislative and regulatory developments, including IRS guidance, Treasury regulations, and OECD Pillar Two updates, and brief the Tax Director on implications.
Provide tax analysis for proposed transactions, new entity structures, and strategic initiatives.
Identify and implement tax workflow improvements and evaluate tools and procedures for more accurate and efficient compliance.
Use Excel and AI research tools to streamline workpaper preparation, data manipulation, and reconciliation.
Document and maintain Tax function policies, procedures, and internal controls.
Work with Accounting, Legal, and Operations on tax matters, regulatory reporting, and special projects.