Tax Manager
As Mainspring continues to scale, we are looking for a Tax Manager who wants to move beyond processing returns and become a true business operator. Reporting to the VP of Finance & Corporate Controller, you will build and own key tax and risk management processes that support the company’s next stage of growth.
Rather than stepping into a mature tax department, you will have the opportunity to help build one. This role offers meaningful ownership, broad exposure across the business, and direct visibility with senior leadership. You will influence how Mainspring approaches tax compliance, risk management, automation, and scalability while developing the skills needed to grow into future management and leadership opportunities.
This role is ideal for a technically strong tax professional who enjoys creating structure, improving processes, and taking ownership. You will partner across Finance, Legal, Operations, Sales, and FP&A while serving as Mainspring’s internal resource on tax compliance, tax reporting, and corporate insurance matters.
If you are a builder who enjoys combining technical expertise with operational impact, this is an opportunity to make a lasting mark on a rapidly growing clean energy company.
Key Responsibilities:
Tax Compliance & Reporting
Own federal and state income tax compliance activities and coordinate with external tax advisors
Manage quarterly and annual ASC 740 tax provision processes
Maintain tax calendars, filing schedules, and payment obligations across jurisdictions
Support audits, tax notices, and inquiries from federal and state authorities
Monitor tax law changes and assess business impacts
Sales, Use & Property Tax
Lead multi-state sales and use tax compliance, including nexus analysis and registrations
Manage sales tax audits, exemptions, and documentation requirements
Oversee business personal property tax filings and related compliance activities
Partner with internal stakeholders to ensure accurate tax treatment of transactions and assets
Risk Management & Insurance
Help manage Mainspring’s corporate insurance programs, including renewals, broker relationships, and coverage reviews
Support contract insurance reviews and claims management activities
Partner with Legal and Operations to identify and mitigate emerging business risks
Process Improvement & Scale
Build and document scalable tax processes and controls
Evaluate and implement tax automation tools where appropriate
Bring tax activities in-house where it creates efficiency and better business visibility
Help establish the foundation for a larger, more sophisticated tax and risk management function
Required Qualifications
5+ years of progressive tax experience in public accounting, industry, or a combination of both
Strong knowledge of ASC 740 income tax accounting and tax provision processes
Experience with federal and state income tax compliance
Hands-on experience with multi-state sales and use tax compliance and nexus analysis
Familiarity with property tax compliance in multiple jurisdictions
Ability to manage multiple deadlines and priorities independently
Strong communication skills and ability to work effectively with non-tax stakeholders
Preferred Qualifications
Big 4 or regional public accounting experience
Experience supporting manufacturing, industrial, energy, hardware, or capital equipment businesses
Exposure to energy tax incentives, R&D tax credits, or other business tax credits
Experience with tax technology platforms such as Avalara, Vertex, OneSource, or CorpTax
Exposure to IPO readiness, public company reporting, or SOX environments
Familiarity with corporate insurance programs and risk management activities