Senior Tax Accountant

Aston Carter; United States; Hybrid; USD 52,000 - 65,000; Part time

Benefits offered by this job

Medical, dental & vision

401(k) retirement plan

Life Insurance

Disability insurance

Health Spending Account

Transit benefits

Employee Assistance Program

PTO

Job summary

Aston Carter is seeking a Senior Tax Accountant for a hybrid role based in Ontario, CA. The position blends month-end close, tax compliance, and financial analysis within a FinTech/SaaS context, with growth potential through internal promotion and a contract-to-hire framework.

The role requires GAAP proficiency, ERP and Excel expertise, and multi-state tax experience. It offers exposure to Dynamics 365, Avalara, and AI tools, with a 7-day close expectation and cross-functional collaboration.

Qualifications

• Bachelor's degree in Accounting, Finance, or related field.
• Strong understanding of GAAP and financial reporting principles.
• Experience with ERP/accounting systems and advanced Excel skills.
• Excellent analytical, organizational, and problem-solving abilities.
• Ability to manage multiple priorities and meet critical deadlines, including 7-day close.
• Public accounting experience from a CPA firm.
• Experience with multi-state tax compliance and regulatory filings.

Responsibilities

• Lead month-end and year-end close activities to ensure timely and accurate financial reporting.
• Prepare and post journal entries and reconcile balance sheet accounts.
• Analyze payroll, incentives, employee benefits, deferred compensation, accruals, and tax-related accounts.
• Research and explain account fluctuations and financial variances.
• Review revenue transactions and customer invoicing for compliance and accuracy.

Skills

GAAP knowledge

Advanced Excel

ERP systems

Cross-functional collaboration

CPA experience

Multi-state tax

Education

Bachelor's degree in Accounting/Finance

CPA (preferred)

Tools

Dynamics 365

Avalara

ERP software

Job description

Senior Tax Accountant

Hybrid Schedule | 3 Days Onsite, 2 Days Remote (After onsite training period) 6-Month Contract-to-Hire Opportunity

Elevate Your Accounting Career

Ready to take the next step beyond traditional accounting? This Senior Tax Accountant role offers a unique blend of month-end close, tax compliance, financial analysis, and strategic initiatives at a growing FinTech company. Open due to an internal promotion, it's a great opportunity to expand your skillset and build a long-term career.

Why Candidates Are Excited About This Opportunity:

Opportunity to join a dynamic, stable, and growing industry within FinTech / SaaS

Hybrid work schedule after training

High-visibility role with exposure to accounting, tax, FP&A, and strategic projects

Opportunity created through internal promotion

Contract-to-hire potential with long-term growth opportunities

Exposure to modern finance technologies, including Dynamics 365, Avalara, and AI tools

Collaborative team environment where your ideas for process improvement are valued

What You'll Be Doing:

• General Accounting: 35%
• Tax & Compliance: 35%
• Special Projects & Ad Hoc Analysis: 20%
• Team Collaboration & Cross-Functional Support: 10%

Accounting & Financial Reporting

• Lead month-end and year-end close activities to ensure timely and accurate financial reporting.
• Prepare and post journal entries and reconcile balance sheet accounts.
• Analyze payroll, incentive compensation, employee benefits, deferred compensation, accruals, reserves, receivables, and tax-related accounts.
• Research and explain account fluctuations and financial variances.
• Review revenue transactions and customer invoicing to ensure compliance and accuracy.
• Assist with budgeting, forecasting, and financial analysis activities.
• Support internal and external audits by preparing schedules and supporting documentation.

Tax & Regulatory Compliance

• Manage multi-entity federal, state, and local tax compliance requirements.
• Partner with external tax advisors on corporate tax return preparation and filings.
• Respond to agency notices and tax-related inquiries.
• Oversee sales tax compliance activities, including administration of Avalara and related filing requirements.
• Maintain business licenses, registrations, annual reports, and other regulatory filings.
• Track critical filing deadlines and compliance obligations.

Process Improvement & Strategic Projects

• Maintain accounting policies, process documentation, and internal controls.
• Identify opportunities to improve efficiency, automation, and financial controls.
• Participate in contract reviews and assess financial implications of business agreements.
• Conduct research and analysis for acquisitions, business initiatives, and special projects.

What We're Looking For:

Required Qualifications

Bachelor's degree in Accounting, Finance, or related field

Strong understanding of GAAP and financial reporting principles

Experience with ERP/accounting systems and advanced Excel skills

Excellent analytical, organizational, and problem-solving abilities

Ability to manage multiple priorities and meet critical deadlines, including 7-day close

Strong communication and cross-functional collaboration skills

Ability to manage multiple priorities and meet critical deadlines

Public accounting experience from a CPA firm

Ability to manage multiple priorities and meet critical deadlines

Experience with multi-state tax compliance and regulatory filings

Preferred Qualifications

Public accounting experience (3+ years preferred, but not required)

Experience with multi-state tax compliance and regulatory filings

Exposure to ASC 606 revenue recognition

SaaS, Technology, or Financial Services industry experience

Experience with Dynamics 365 and Avalara

Familiarity with AI tools such as Microsoft Copilot

Job Type & Location

This is a Contract to Hire position based out of Ontario, CA.

Pay and Benefits

The pay range for this position is $38.46 - $47.21/hr.

Individual compensation offered for this position within this range will depend on many factors, including qualifications, skills, relevant experience, job knowledge, geographic location, internal equity, and other pertinent job-related factors.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may besubject to specific elections, plan, or program terms. If eligible, the benefitsavailable for this temporary role may include the following:

• Medical, dental & vision
• Critical Illness, Accident, and Hospital
• 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available
• Life Insurance (Voluntary Life & AD&D for the employee and dependents)
• Short and long-term disability
• Health Spending Account (HSA)
• Transportation benefits
• Employee Assistance Program
• Time Off/Leave (PTO, Vacation or Sick Leave)

Workplace Type

This is a hybrid position in Ontario,CA.

Application Deadline

This position is anticipated to close on Oct 8, 2026.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

If you would like to request a reasonable accommodation, such as the modification or adjustment of the job application process or interviewing process due to a disability, please email [e-mail] for other accommodation options.

San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.