<h3>About Mainspring</h3><p>Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more.</p><p>The <a href="https://www.mainspringenergy.com/company"><span style="color:#3598db;"><span style="text-decoration:underline;">core values</span></span></a> that ground our work, guide our decisions, and connect us together:</p><ul><li>Pragmatic Optimism</li><li>Excellence without Ego</li><li>Proactive Collaboration</li></ul><div><br></div><div><p>As Mainspring continues to scale, we are looking for a <em><strong>Tax Manager</strong></em> who wants to move beyond processing returns and become a true business operator. Reporting to the VP of Finance &amp; Corporate Controller, you will build and own key tax and risk management processes that support the company’s next stage of growth.</p><p>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.</p><p>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&amp;A while serving as Mainspring’s internal resource on tax compliance, tax reporting, and corporate insurance matters.</p><p>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.</p><h3>Key Responsibilities:</h3><h3>Tax Compliance &amp; Reporting</h3><ul><li><p>Own federal and state income tax compliance activities and coordinate with external tax advisors</p></li><li><p>Manage quarterly and annual ASC 740 tax provision processes</p></li><li><p>Maintain tax calendars, filing schedules, and payment obligations across jurisdictions</p></li><li><p>Support audits, tax notices, and inquiries from federal and state authorities</p></li><li><p>Monitor tax law changes and assess business impacts</p></li></ul><h3>Sales, Use &amp; Property Tax</h3><ul><li><p>Lead multi-state sales and use tax compliance, including nexus analysis and registrations</p></li><li><p>Manage sales tax audits, exemptions, and documentation requirements</p></li><li><p>Oversee business personal property tax filings and related compliance activities</p></li><li><p>Partner with internal stakeholders to ensure accurate tax treatment of transactions and assets</p></li></ul><h3>Risk Management &amp; Insurance</h3><ul><li><p>Help manage Mainspring’s corporate insurance programs, including renewals, broker relationships, and coverage reviews</p></li><li><p>Support contract insurance reviews and claims management activities</p></li><li><p>Partner with Legal and Operations to identify and mitigate emerging business risks</p></li></ul><h3>Process Improvement &amp; Scale</h3><ul><li><p>Build and document scalable tax processes and controls</p></li><li><p>Evaluate and implement tax automation tools where appropriate</p></li><li><p>Bring tax activities in-house where it creates efficiency and better business visibility</p></li><li><p>Help establish the foundation for a larger, more sophisticated tax and risk management function</p></li></ul><h3>Required Qualifications</h3><ul><li><p>5+ years of progressive tax experience in public accounting, industry, or a combination of both</p></li><li><p>Strong knowledge of ASC 740 income tax accounting and tax provision processes</p></li><li><p>Experience with federal and state income tax compliance</p></li><li><p>Hands-on experience with multi-state sales and use tax compliance and nexus analysis</p></li><li><p>Familiarity with property tax compliance in multiple jurisdictions</p></li><li><p>Ability to manage multiple deadlines and priorities independently</p></li><li><p>Strong communication skills and ability to work effectively with non-tax stakeholders</p></li></ul><h3>Preferred Qualifications</h3><ul><li><p>Big 4 or regional public accounting experience</p></li><li><p>Experience supporting manufacturing, industrial, energy, hardware, or capital equipment businesses</p></li><li><p>Exposure to energy tax incentives, R&amp;D tax credits, or other business tax credits</p></li><li><p>Experience with tax technology platforms such as Avalara, Vertex, OneSource, or CorpTax</p></li><li><p>Exposure to IPO readiness, public company reporting, or SOX environments</p></li><li><p>Familiarity with corporate insurance programs and risk management activities</p></li></ul></div><br><br><br><p>Does your experience not meet all of our posted requirements? Studies have shown that some people are less likely to apply to positions unless they meet every listed requirement. At Mainspring, we are committed to building a diverse, inclusive, flexible, and collaborative environment, so if you want to help us transition the world to clean and affordable electricity, and don’t meet all posted requirements for a particular role, we’d still love to hear from you. Mainspring can sometimes be flexible enough to shift responsibilities for the right person, or otherwise identify open or upcoming roles that may better fit your professional background.</p><p>In more traditional words, Mainspring Energy, Inc is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.</p><p>This compensation and benefits information is based on Mainspring Energy's estimate as of the date of publication and may be modified in the future. We generally do not negotiate on salary once we have made an offer. The level of pay within the range will depend on a variety of job-related factors that may include location, relevant prior experience and/or education, or particular skills and expertise. New hires joining the company tend to be paid within the starting base pay range noted above, with opportunities to increase pay over time based on development of additional skills, competencies, and company-specific knowledge.</p>

<p class="text-steel f-b1 md-max:mb-d">At Mainspring we believe the fastest path to the net-zero carbon grid is vastly increasing the amount of solar and wind power while building a supporting clean energy system that ensures affordability and multi-day, cross-season resilience. Getting there requires flexible, scalable, local technologies that can adapt to the shifting grid landscape &ndash; including the transition from natural gas to renewable fuels like biogas, green ammonia, and green hydrogen.</p>
<div>
<p class="text-steel f-b1">The Mainspring Linear Generator delivers an unmatched level of flexibility for the transition ahead. It&rsquo;s local so you can site where power is needed, it&rsquo;s dispatchable so you can ramp up and down to complement renewables, and it&rsquo;s fuel-flexible so you can operate on the cleanest fuels available today and in the future. Our products are already at work at Fortune 500 customer sites, accelerating the arrival of the net-zero carbon grid.</p>
</div>

Tax Manager

<h3>About Mainspring</h3><p>Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more.</p><p>The <a href="https://www.mainspringenergy.com/company"><span><span>core values</span></span></a> that ground our work, guide our decisions, and connect us together:</p><ul><li>Pragmatic Optimism</li><li>Excellence without Ego</li><li>Proactive Collaboration</li></ul><div><br /></div><div><p>As Mainspring continues to scale, we are looking for a <em><strong>Tax Manager</strong></em> who wants to move beyond processing returns and become a true business operator. Reporting to the VP of Finance &amp; Corporate Controller, you will build and own key tax and risk management processes that support the company’s next stage of growth.</p><p>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.</p><p>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&amp;A while serving as Mainspring’s internal resource on tax compliance, tax reporting, and corporate insurance matters.</p><p>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.</p><h3>Key Responsibilities:</h3><h3>Tax Compliance &amp; Reporting</h3><ul><li><p>Own federal and state income tax compliance activities and coordinate with external tax advisors</p></li><li><p>Manage quarterly and annual ASC 740 tax provision processes</p></li><li><p>Maintain tax calendars, filing schedules, and payment obligations across jurisdictions</p></li><li><p>Support audits, tax notices, and inquiries from federal and state authorities</p></li><li><p>Monitor tax law changes and assess business impacts</p></li></ul><h3>Sales, Use &amp; Property Tax</h3><ul><li><p>Lead multi-state sales and use tax compliance, including nexus analysis and registrations</p></li><li><p>Manage sales tax audits, exemptions, and documentation requirements</p></li><li><p>Oversee business personal property tax filings and related compliance activities</p></li><li><p>Partner with internal stakeholders to ensure accurate tax treatment of transactions and assets</p></li></ul><h3>Risk Management &amp; Insurance</h3><ul><li><p>Help manage Mainspring’s corporate insurance programs, including renewals, broker relationships, and coverage reviews</p></li><li><p>Support contract insurance reviews and claims management activities</p></li><li><p>Partner with Legal and Operations to identify and mitigate emerging business risks</p></li></ul><h3>Process Improvement &amp; Scale</h3><ul><li><p>Build and document scalable tax processes and controls</p></li><li><p>Evaluate and implement tax automation tools where appropriate</p></li><li><p>Bring tax activities in-house where it creates efficiency and better business visibility</p></li><li><p>Help establish the foundation for a larger, more sophisticated tax and risk management function</p></li></ul><h3>Required Qualifications</h3><ul><li><p>5+ years of progressive tax experience in public accounting, industry, or a combination of both</p></li><li><p>Strong knowledge of ASC 740 income tax accounting and tax provision processes</p></li><li><p>Experience with federal and state income tax compliance</p></li><li><p>Hands-on experience with multi-state sales and use tax compliance and nexus analysis</p></li><li><p>Familiarity with property tax compliance in multiple jurisdictions</p></li><li><p>Ability to manage multiple deadlines and priorities independently</p></li><li><p>Strong communication skills and ability to work effectively with non-tax stakeholders</p></li></ul><h3>Preferred Qualifications</h3><ul><li><p>Big 4 or regional public accounting experience</p></li><li><p>Experience supporting manufacturing, industrial, energy, hardware, or capital equipment businesses</p></li><li><p>Exposure to energy tax incentives, R&amp;D tax credits, or other business tax credits</p></li><li><p>Experience with tax technology platforms such as Avalara, Vertex, OneSource, or CorpTax</p></li><li><p>Exposure to IPO readiness, public company reporting, or SOX environments</p></li><li><p>Familiarity with corporate insurance programs and risk management activities</p></li></ul></div><br /><br /><br /><p>Does your experience not meet all of our posted requirements? Studies have shown that some people are less likely to apply to positions unless they meet every listed requirement. At Mainspring, we are committed to building a diverse, inclusive, flexible, and collaborative environment, so if you want to help us transition the world to clean and affordable electricity, and don’t meet all posted requirements for a particular role, we’d still love to hear from you. Mainspring can sometimes be flexible enough to shift responsibilities for the right person, or otherwise identify open or upcoming roles that may better fit your professional background.</p><p>In more traditional words, Mainspring Energy, Inc is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.</p><p>This compensation and benefits information is based on Mainspring Energy's estimate as of the date of publication and may be modified in the future. We generally do not negotiate on salary once we have made an offer. The level of pay within the range will depend on a variety of job-related factors that may include location, relevant prior experience and/or education, or particular skills and expertise. New hires joining the company tend to be paid within the starting base pay range noted above, with opportunities to increase pay over time based on development of additional skills, competencies, and company-specific knowledge.</p>

Tax Manager

About the Job

About the Company

Mainspring Energy

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