Home – Thanh Dat Tax & Accounting

Smarter Tax Solutions with AI-Driven Accuracy and Efficiency

Welcome To Thanh Dat Tax & Accounting

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Maximize Savings with Our Expert Tax Services for Businesses & Individuals

Welcome To Thanh Dat Tax & Accounting

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Streamline Bookkeeping & Payroll for Smooth Business Operations

Welcome To Thanh Dat Tax & Accounting

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Plan Taxes & Business Strategies for Long-Term Success

Welcome To Thanh Dat Tax & Accounting

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Safeguard Your Business with Professional Audit Services

Welcome To Thanh Dat Tax & Accounting

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Simplify Immigration Processes with Our Expert Guidance

Welcome To Thanh Dat Tax & Accounting

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Tax Services

Accurate tax consulting and filing services to optimize costs and ensure legal compliance.

Accounting Services

Clear and transparent bookkeeping and financial reporting to support efficient business operations.

ABOUT US

Your Trusted Partner in Financial Success & Business Growth

Principal Tax Consultant at Thanh Dat Tax & Accounting

Proven Experience, Trusted by 1,000+ Clients
Thanh Dat Tax & Accounting has proudly served over 1,000 clients, combining years of industry expertise with personalized care. Our deep knowledge allows us to deliver accurate, dependable solutions tailored to each client’s unique tax and accounting needs.

Personalized, Full-Service Support
We take time to understand your business goals and customize our services accordingly. From tax planning and bookkeeping to payroll and compliance, we provide comprehensive solutions to streamline your operations and support your growth.

Phillip Nguyen, Principal Tax Consultant at Thanh Dat Tax & Accounting

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Businesses Using Full Accounting Services

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About Us

Empowering Small Businesses

Choose the Right Firm — Your Success Is Our Purpose

Our Mission

We empower small business owners across Washington to stay compliant, manage their finances with clarity, and grow with confidence.

Through accurate, flexible, and stress-free tax filing, accounting, and payroll solutions, we stand by our clients at every step of their business journey—so they can focus on what matters most: running their business.

Our Vision

To become a trusted and innovative tax and accounting firm recognized for excellence, long-term client relationships, and our role in empowering small businesses to thrive through financial clarity and strategic guidance.

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Ready To Help:
📞 +1 206 483 9729
📞 +1 425 276 1910

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OUR SERVICES

What We Provide

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Individual & Business Tax

Accurate, stress-free tax filing for individuals and businesses of all sizes.

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On-Time Payroll

Pay your team on time—without the hassle.

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Smart Bookkeeping

Automated tracking to keep your finances organized and and tax-ready.

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Tax Planning

Proactive strategies to reduce your tax bill and boost savings.

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Business Formation

Start your business with the right structure and expert guidance.

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IRS Audit Representation

Facing an audit? Count on us for expert support and peace of mind.

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Immigration Support

Professional support for forms, filings, and navigating immigration processes.

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Notary Service

Quick, reliable notarization—anytime, anywhere.

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Comming Soon

Get Free Professional Advisor.
Ready To Help: +1 425 276 1910

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WHY CHOOSE US

At Thanh Dat, we go beyond the numbers - offering smart, reliable, and personalized service to help you and your business thrive.

How do we generate new ideas? More than 1,000+ Happy Clients

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Client Portal & Mobile Access

Easily upload documents, track tasks, and communicate with us anytime—right from your phone or computer.

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Fast Turnaround Times

Same-day pay stub generation and quick response times to keep your business running smoothly without delays.

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All-in-One Services

From payroll and bookkeeping to licensing and tax planning—we handle it all in one place to save you time and stress.

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Personalized Service

We tailor tax and accounting solutions to fit your unique business needs and industry.

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Smart & Accurate

Modern tools and AI deliver accurate, compliant, efficient results.

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Ongoing Support

Year-round support with answers, payroll, and business guidance.

WHY CHOOSE US

CERTIFICATIONS & AFFILIATIONS

Our Credentials & Industry Partnerships

OUR CUSTOMERS

Who Our Customers Are

Testimonials

What Clients Says

Review us on Google

      
   Thanh Dat Tax & Accounting, LLC
   38 Google reviews 
  Write a review 
  
 
 
   
 
 
       Posted on Google  
   
   Yu Han, MD 
 
 
 
 Trustindex verifies that the original source of the review is Google. awesome guy, i would not go to anyone else with my taxes after working with Phillip. He is very knowledge for small business owners. I am very satisfied.
  
 
      Posted on Google  
   
   Lorraine Sampayan 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had the pleasure of meeting Phillip and his team for the first time, and the experience was fantastic. He made my tax return process incredibly fast and easy, handling everything efficiently and with great professionalism. I was impressed by how smooth everything went, and I highly recommend him for anyone looking for reliable and quick tax services! Thank you so much!
  
 
      Posted on Google  
   
   Hồng ân Nguyen 
 
 
 
 Trustindex verifies that the original source of the review is Google. Good
  
 
      Posted on Google  
   
   Jessie Do 
 
 
 
 Trustindex verifies that the original source of the review is Google. They help me save a tons of money. Quick service, friendly owner and nice receptionist
  
 
      Posted on Google  
   
   Uyen Dam 
 
 
 
 Trustindex verifies that the original source of the review is Google. Very good
  
 
      Posted on Google  
   
   Théi Ziệt 
 
 
 
 Trustindex verifies that the original source of the review is Google. The Thanh Dat team was exceptional. What really impressed me was their secure system for uploading tax documents. As someone who prioritizes data security, I truly value the strong measures they've put in place to safeguard sensitive information. This not only shows their dedication to maintaining client confidentiality but also makes the entire tax-filing process more convenient.
  
 
      Posted on Google  
   
   MONKY 
 
 
 
 Trustindex verifies that the original source of the review is Google. Good customer service. Kind owner and receptionist
  
 
      Posted on Google  
   
   Tình Nguyễn Hữu 
 
 
 
 Trustindex verifies that the original source of the review is Google. Thanh Dat’s team reviewed my past tax returns and identified mistakes from my previous filing that saved me a lot of money! I trust them with my taxes now—they’re detailed, trustworthy, and dependable
  
 
      Posted on Google  
   
   KHANG HUỲNH DIỆP CHÍ 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great service, friendly staffs and owner. I will be back.
  
 
      Posted on Google  
   
   Tri Mai 
 
 
 
 Trustindex verifies that the original source of the review is Google. Thanh Dat's team was exceptional in helping me with my tax filings. They identified mistakes from my previous returns that resulted in significant savings. Their honesty, reliability, and thoroughness have made me a loyal client for all my tax needs.

" Our goal is to empower small business owners through smart, stress-free tax and accounting services. "

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Working Hours

Schedule an Appointment

During Tax Season (January to April):

Monday – Sunday: 10:00 AM – 6:00 PM

After Tax Season:

Monday – Friday: 10:00 AM – 5:00 PM.
Saturday: By Appointment Only