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Sales Tax Expert

About the role

Firstbase.io is on a mission to build an “All-In-One Company OS” to enable global founders to launch, operate, and grow their businesses using Firstbase’s suite of products.

As a Sales Tax Expert at Firstbase, you will play a key role in delivering a seamless, reliable, and fully managed compliance experience for our clients. Acting as their main point of contact, you’ll guide them through complex state sales tax obligations while our team handles all filings, registrations, and government interactions on their behalf. You’ll collaborate closely with our Sales Tax Specialists, Product, and CX teams to ensure each client is properly onboarded, their tax setup is accurate, and their ongoing needs are met with clarity and speed. You’ll advise on nuanced scenarios like marketplace facilitator rules and changing nexus thresholds, always translating complexity into practical guidance. Your role will also support commercial efforts, helping articulate our value to prospective clients through demos and onboarding conversations.

About Firstbase.io

Firstbase.io is building an all-in-one Company OS to help define how founders across the globe launch, manage, and grow their businesses.

More than twenty thousand founders from over 180 countries have used our incorporation product, Firstbase Start, to launch their startups. For many founders, "firstbase.io" has become what they type into their address bars when considering incorporating a business. 

We are backed by Y Combinator & our team, investors, and advisors include people from Apple, Gusto, Carta, Wise, Plaid, and many other great companies.

Why you should join

Firstbase is much more than just incorporation. Our team is dedicated to building products & solving some of the startups’ hardest problems, with particular focus on:

  • Democratizing access to financial infrastructure

  • Automating tasks every founder faces when running a business

  • Making tools and resources more accessible to everyone, everywhere

  • Building integrated solutions for founders and removing friction

  • Delivering opportunities to traditionally overlooked founders and companies

  • Democratizing access to knowledge

Join us on a mission to help more companies succeed!


Who are we looking for

We are looking for risk-takers with diverse experience who can provide fearless feedback.

You will have the following duties

  • Serve as the main point of contact for clients on all sales tax matters — guiding them through obligations and directly managing registrations, filings, notices, and state communications.

  • Be the primary liaison to our internal Sales Tax Specialists, who are responsible for onboarding clients and setting up the platform.

  • Advise clients on nuanced scenarios such as marketplace facilitator rules, taxability differences by state, or nexus changes — ensuring they understand the implications while we handle execution.

  • Respond to client questions and proactively communicate key updates related to filings, payments, and government notices, keeping them informed without burdening them with the details.
    Occasionally support commercial efforts such as product demos or onboarding calls to help prospective or new clients understand our process and value proposition.

You should meet the following requirements

  • Solid understanding of U.S. sales tax concepts, including nexus, taxability, registration, and filing requirements across states.

  • Experience handling or supporting sales tax compliance for U.S.-based businesses, either in-house, at a consultancy, or through a SaaS platform.

  • Strong communication and client-facing skills — able to explain complex tax concepts in simple terms and build trust with a wide range of business profiles.

  • Commercial mindset — comfortable interacting with startups, founders, and finance teams to support onboarding and ensure client satisfaction.

  • High attention to detail and ability to manage multiple clients and deadlines simultaneously.

  • Nice to have: Previous experience in a customer-facing tax advisory, sales tax tech, or fintech/compliance SaaS company.

Some perks you might enjoy

  • Competitive salary & equity

We lean on some of the best market data to ensure that we offer the most competitive compensation.

  • Hybrid work environment

We work both remotely & from our office in New York City – optimizing for collaboration while providing flexibility to team members.

  • 21 days of PTO + birthday off

We offer flexibility to allow people to relax and recharge whenever they need it.

  • Build your ideal work setup

We understand that how you work is extremely important, so we provide a stipend to set you up for success here at Firstbase.

  • Health benefits

Firstbase offers health insurance reimbursements to both US and international employees

  • Learning & development

We provide a stipend together with resources to help people grow and develop in their careers.

  • Amazing annual bonuses

Every team at Firstbase has a bonus structure which usually accounts for 10% of OTE.

Even if you don’t check every single box but you’re passionate about the role and want to help build something great, we still want to hear from you. We value diverse experiences, unique perspectives, and people who are driven to make an impact. If that sounds like you, we’d love to meet you.

Average salary estimate

$100000 / YEARLY (est.)
min
max
$80000K
$120000K

If an employer mentions a salary or salary range on their job, we display it as an "Employer Estimate". If a job has no salary data, Rise displays an estimate if available.

What You Should Know About Sales Tax Expert, Firstbase.io

Join the innovative team at Firstbase.io as a Sales Tax Expert! At Firstbase, our mission is to empower global founders to launch, operate, and grow their businesses with our all-in-one suite of products. As a Sales Tax Expert, you'll be a vital resource, guiding clients through the labyrinth of U.S. sales tax obligations while ensuring they have a hassle-free compliance experience. Acting as their primary contact, you will collaborate closely with our Sales Tax Specialists and the customer experience team to seamlessly onboard clients, set up accurate tax configurations, and address their ongoing needs. Your role will involve translating complex sales tax scenarios, like nexus changes and marketplace facilitator rules, into clear, actionable advice that clients can trust. You will also play a part in commercial efforts, showcasing our value to potential clients through engaging product demos and onboarding conversations. We're building something extraordinary at Firstbase, where a diverse team works together to solve tough problems facing startups and entrepreneurs. Come help us on our journey to make business accessible to everyone!

Frequently Asked Questions (FAQs) for Sales Tax Expert Role at Firstbase.io
What are the responsibilities of a Sales Tax Expert at Firstbase.io?

As a Sales Tax Expert at Firstbase.io, your responsibilities include serving as the primary point of contact for clients regarding sales tax matters. You'll manage registrations, filings, and government communications, ensuring they understand their state tax obligations. Collaborating with Sales Tax Specialists, you will guide clients through onboarding, addressing complex tax scenarios and proactively keeping them informed about any key updates related to compliance.

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What qualifications are needed for the Sales Tax Expert role at Firstbase.io?

To qualify for the Sales Tax Expert position at Firstbase.io, candidates should have a solid understanding of U.S. sales tax concepts such as nexus and registration requirements. Experience in sales tax compliance—either in-house, at a consultancy, or through a SaaS platform—is essential. Strong communication skills and a client-facing mindset are crucial to effectively explain tax complexities while building trust with clients.

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How does the Sales Tax Expert contribute to client success at Firstbase.io?

At Firstbase.io, the Sales Tax Expert greatly contributes to client success by simplifying the complexities of sales tax compliance. By serving as a trusted advisor, you’ll translate intricate tax rules into easy-to-understand advice, guiding clients through their obligations and ensuring they have the necessary support for their filings and registrations, ultimately leading to enhanced client satisfaction.

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What types of clients will a Sales Tax Expert work with at Firstbase.io?

As a Sales Tax Expert at Firstbase.io, you will mainly work with a diverse range of startups and founders across various industries. Your role will involve interacting with finance teams and new business clients who may have different levels of tax understanding, allowing you to provide tailored support and ensure they reach their business goals.

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What career benefits does Firstbase.io offer to Sales Tax Experts?

Firstbase.io offers an array of benefits for Sales Tax Experts, including competitive salaries and equity options, a hybrid work environment, 21 days of PTO plus your birthday off, and health benefits. Additionally, the company provides resources for professional development and an amazing annual bonus structure, making it an attractive place for career growth.

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Common Interview Questions for Sales Tax Expert
How would you explain the concept of nexus to a client?

When explaining nexus to a client, it's important to break it down into layman’s terms. You might say, 'Nexus determines a business’s tax obligations in various states based on their presence. This can be due to physical locations or sales thresholds, and I will help you navigate these complexities to ensure compliance.'

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Can you describe your experience with sales tax compliance?

In describing your experience with sales tax compliance, highlight your relevant positions and tasks. For instance, 'I worked for a consultancy where I assisted multiple clients in understanding their sales tax requirements, managing their filings, and troubleshooting any issues that arose with state agencies, ensuring compliance and building client trust.'

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What strategies do you use to stay organized when managing multiple clients?

To stay organized while managing multiple clients, I use project management tools such as Trello or Asana to track deadlines and client communications. I prioritize tasks based on urgency and importance, and I ensure regular check-ins with clients to keep them informed of their status, which enhances transparency and builds trust.

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How do you handle a client who is confused about their sales tax obligations?

When a client is confused about their sales tax obligations, I take a patient and supportive approach. I would start by asking them specific questions to gauge their understanding and address any misconceptions. I would then provide a clear explanation of their obligations, supplemented with practical examples, to clarify the situation and help them feel more at ease.

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Why is client communication important in a sales tax advisory role?

Client communication is paramount in a sales tax advisory role because it lays the foundation for trust and collaboration. Clear, timely updates and explanations can alleviate client anxieties, ensuring they feel supported. Additionally, effective communication can help identify potential issues early and facilitate smoother filings.

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What tools or software are you familiar with for tax compliance?

I am familiar with several tools used for tax compliance, including TurboTax, Avalara, and QuickBooks. These platforms help automate and streamline tax filings, and I’m adept at using them to ensure my clients meet their obligations efficiently while minimizing errors.

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Describe a challenging tax issue you resolved for a client.

In discussing a challenging tax issue, illustrate your problem-solving skills with a specific example. For instance, 'I once helped a client faced with unexpected tax notices due to mistaken nexus determinations. By researching their business activities and negotiating with state tax offices, I was able to clarify their obligations and successfully resolve the issue.'

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How do you keep updated with changes in sales tax regulations?

I keep updated with changes in sales tax regulations by subscribing to tax publications, attending webinars, and participating in relevant professional organizations. Staying informed allows me to proactively advise clients about new obligations that could affect their businesses.

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What makes you a good fit for the Sales Tax Expert role at Firstbase.io?

I believe I am a good fit for the Sales Tax Expert role at Firstbase.io because I have a strong foundation in sales tax compliance, demonstrated experience in client-facing roles, and a passion for helping entrepreneurs thrive. My proactive approach and ability to simplify complex subjects align with Firstbase's mission to support clients effectively.

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How would you explain marketplace facilitator rules to a client?

When explaining marketplace facilitator rules to a client, I would clarify that these rules require platforms like Amazon to collect and remit sales tax on sellers' behalf. I would explain how this impacts their business operations and what they need to be aware of to ensure compliance, guiding them through their responsibilities in this context.

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Firstbase is building an all-in-one Company OS to define how founders across the globe launch, manage, and grow their businesses.

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April 24, 2025

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