Tax Filing. Tax Strategy. Done Right.

Taxes shouldn’t be a panic-inducing, last-minute mess. We help you stay ahead — with year-round prep, proactive strategy, and accurate filing.

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Loved by 300+ Firms Nationwide

Rachel Lund

Self Space

"System Six is essential to our success—trustworthy, responsive, and knowledgeable. I've referred many entrepreneurs to them."

Rich Kim

TEAH

"As a new business owner, I knew nothing about payroll, taxes, and B&O—it gave me tons of anxiety. My CPA recommended System Six as the best firm for my business. They've helped me end-to-end with finances and accounting, keeping me compliant and anxiety-free."

Mary Coday

Overlake Eye Care

"They provided invaluable leadership guidance during temporary layoffs and ramping back up. Having System Six is among the top three best decisions we've made for our practice."

Brad Borkhuis

Epitome

"I've worked with System Six for years—they're a Godsend! Extremely valuable, accurate, reliable, and always willing to go the extra mile. You won't regret it. The time and money saved paid for their services 10 times over!"

Trusted by founders, operators & CFOs from
firms between $1M–$50M+

SEE OUR CLIENTS

Success stories from businesses like yours

Learn how firms stopped overpaying taxes, avoided five-figure penalties, and transformed tax season from a scramble into a strategic advantage.
View All Testimonials

WHAT WE DO

Tax Filing. Strategic Advisory.
Complete Compliance.

We prepare and file your federal and state returns, provide ongoing tax advisory to minimize liability, and manage year-round compliance — giving you confidence and real savings.

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Tax Prep & Filing

Get your federal and state returns filed on time — every time.

  • check icon Federal, state, and local return filing
  • check icon W-2 and 1099 year-end processing
  • check icon Deadline tracking and reminders
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Tax Planning & Strategy

Don’t just file. Plan to save.

  • check icon Quarterly planning and advisory sessions
  • check icon Entity structure, deduction planning, and timing strategies
  • check icon Forecasting aligned with your financial goals
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Bookkeeping Team
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Bookkeeping Team

Multi-State & Sales Tax
Support

Business across borders? We’ve got you covered.

  • check icon Sales & use tax filing in all jurisdictions
  • check icon Nexus studies and filing support
  • check icon Compliance across all 50 states
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15+
Years Of
Experience
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Industries We Serve

We Know Your Industry’s Tax Challenges:

  • check Consulting: Management, HR, Legal, Environmental
  • check Agencies: Marketing, Creative, Architecture, Engineering
  • check Tech: Startups, SaaS, IT Services, Cybersecurity
  • check Investor-Backed: Search funds, PE-backed firms
  • check Healthcare & Home Services
  • check Nonprofits & Religious Organizations
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HOW WE WORK

HOW TAX SERVICES WORK
WITH US

Discovery & Onboarding

(Weeks 1–2)

We review your past
filings, financials, and
business structure

Planning & Optimization

(Weeks 3–6)

Build a tax calendar,
identify opportunities, set
up sales tax filings

Filing & Ongoing Advisory

(Ongoing)

Quarterly reviews,
on-time filing, and
long-term tax savings

Start Your Tax Plan

WHY FIRMS CHOOSE
SYSTEM SIX

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End-to-End Tax Support - Planning, Filing, and Beyond

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100% On-Time Filing Track Record

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Multi-state Expertise - All 50 states covered

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U.S.-Based Experts — 10+ Years Average Experience          

Let’s make something great work together.

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FAQ

Do you file tax returns directly? +
→ Yes. We file federal, state, and local returns for businesses in all 50 states.
Can you help reduce my tax bill? +
→ Absolutely. We offer ongoing advisory to optimize deductions and timing.
What about sales & use tax? +
→ We manage filing across multiple states and help you stay compliant.
Do you work with my CPA? +
→ We’re your tax team now — you don’t need to coordinate with a third party.
How quickly can you take over our taxes? +
→ Most clients are onboarded and stress-free within 2–4 weeks.

Year-Round Tax
Support. Zero Surprises.

File with confidence.
Plan for growth.

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Get Your Numbers Working for You

Stop wrestling with books, taxes, or payroll. We’ll review your setup and show you how clean, consistent financials can unlock growth.

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Tax

by | Nov 19, 2025

Help us Spread Cheer in 2020!

In lieu of a traditional holiday client gift this year, we decided to direct that money to a handful of non-profit organizations we’re honored to serve or support.

Please use this link to review a list of charities and then help by telling us where you think we should donate $100. THANK YOU for helping us spread a little cheer this year!

We are grateful to serve nearly 200 clients ranging from for-profits, non-profits, and faith-based organizations. It’s been one-heck of a year for each and every one of us, and we’re honored to give away some of what we’ve been blessed with this year.

 

Schools

The Children’s School Seattle

Tiny Trees

Little Hawks / Outdoor Discovery Center

Anti Human Trafficking

SAFE

Simple & Just

Rest

Rescue:Freedom

 

Faith Based Non-Profits

HRC

Made for PAX

Teleios

Churches

System Six will split the donation across each of the churches that we serve

Homelessness

Homeless Shelters in Every City Our Team Lives In