Guidance to help reduce your taxes and improve your finances

3040 78th Ave SE #854, Mercer Island, WA 98040-0854

(805) 660-3658
Mon - Thurs ( 1:00pm - 6:00pm ) / Other hours by appointment


NumberCrunchers is an outstanding organization led by Paula D. Williams, EA. Paula is an extremely capable and talented Tax Professional, who is thorough, careful and meticulous in whatever she does. These qualities will benefit you, be it tax matters, filings or representations, as well as in NumberCrunchers providing you, with Financial and Business services, efficiently and in a timely manner.

Dr V Seshan

Paula has been the accountant for our two small businesses for over ten years. She is amazing! She and Dee are supportive, smart, knowledgeable, pro-active, and very helpful. We will keep coming to Paula as long as we are in business! I can’t recommend her highly enough.

Judy V

NumberCrunchers is awesome and so is their entire staff, Especially Paula and D. They have been taking care of my wife and I for many years. They are friendly, patient and honest. I highly recommend them as they truly do make my life less taxing.

Warren S

Oak Park, CA

I have been using Paula and Dee for many years and I would recommend them highly to anyone who wants to go through April 15th as painlessly as possible. When I first went to her many years ago, I was delinquent in filing taxes for about eight years. I was so embarrassed. She was so understanding and helpful! She knew exactly how to contact the IRS and State and arrange for my past records. She then was able to reconstruct my
taxes for each year and negotiate a settlement with both agencies. I felt so much relief to finally be current with the filings, even though I still had to make monthly payments to catch up. I finally stopped getting all those threatening IRS and Franchise Tax Board letters every year. What a relief! Dee gently reminds me each year to send my stuff to her and now I usually get a refund. Death and taxes are forever and I am grateful that Paula has relieved at least one of them. I am still negotiating with the man with the pitch fork about the other.

Gordon S

West Hills, CA

Paula Williams, Senior partner of NumberCrunchers has been our Enrolled Agent/Tax Preparer for at least the last five years. She has always provided my husband and I superior service. Paula is exceptionally knowledgeable on all tax related matters. She lets nothing slip through the cracks. Ms.Williams is at the top of her field by continuously completing her professional education tax related courses. In addition, she has professionally and successfully served as our advocate before the I.R.S. Ms. Paula Williams is definitely the best person for any of your personal or business tax and financial services needs.

Darlene Fowlks

I have been using NumberCrunchers for over 15 years. The staff is pleasant, efficient, and competent. I am impressed with their knowledge of tax laws.

Marge Cockrell

Paula Williams and all the NumberCrunchers staff are always available for any of your tax needs. Paula has personally help get my business on the right track and is always there for any of my tax questions. I would and have recommended her for any of your tax needs.She is wonderful in fact all of the staff at NumberCruchers are fantastic!!! Thanks for all you service at the office and in the community.

Mike Dehart

I really like working with Paula. I know she will do a thorough job on my taxes, AND!!! She will get them as low as she can. AND!!! I don’t dread notices from IRS anymore. When i tried doing them myself that was a constant worry. One of the reason i like working with her is that she LOVES saving people money on taxes. It makes her heart sing.

Kate O

Simi Valley, CA

I will only use NumberCrunchers for all of my tax needs. Not only do they have a wonderful hands on approach, they also have that personal touch. Every year for my birthday, NumberCrunchers mails me a birthday card. They are readily available for any questions that i have and they are reasonably priced. When anyone asks who they should use for their accounting needs, I always refer them to NumberCrunchers.

Jennifer J

Simi Valley, CA

With Paula and her staff, we have one less thing to worry about when it comes to running our business. They are very patient and work with me around my schedule. Paula is very knowledgeable in her field and i feel confident having NumberCrunchers do our yearly returns.

Jeff and Terry Walson

Champion Transmission, Simi Valley, Ca

Not only have i known Paula for a couple decades, i have relied on her expertise to counsel and guide many of my clients when i was in the real estate and mortgage business. I recommend Paula Wholeheartedly to my clients that seek a personalized approach to tax planning and preparation. I can honestly say, you will enjoy the experience and probably come away making new friend – yes, she’s that good!

Paul H.

Moorpark, CA

NumberCrunchers has been handling our financial needs for over 10 years. ALWAYS finding us the best options, giving us outstanding tax help, and all while adding humor and professionalism to everything. It makes the whole process so much easier. I would not go anywhere else. Paula and D do outstanding work. They are also incredibly involved in volunteer work and have made a real difference in improving Simi Valley.

Betsy B

Simi Valley, CA

NumberCrunchers has been preparing my tax returns for the last 18 years. They have also given advise on how best to handle finances during the years so that we get the best tax benefits possible. They are both very personable and friendly. I would not go anywhere else for tax preparation.


Castaic, CA

Erik M

Thousand Oaks, CA

Paula has been my accountant for five years. I rely on her team for tax preparation (personal and business) and i’m planning to use them for financial advising. While i dread the annual sit-down in the spring, Paula treats it like a sport and the IRS is our opponent! She works very hard to find every (legal) advantage available to me. Dee is always pleasant and patient when we are solidifying appointments. I look forward to many more years of a successful relationship with NumberCrunchers!


Pasadena, CA

NumberCrunchers has done a great job for us. I cannot think of a better place to trust with my financial well being. Thank you Paula and everyone in the office.

N Wayne P

West Hills, CA

Paula is helpful, calming, kind and thorough! She is professional and caring as well. Dee is also an excellent asset to NumberCrunchers! I had to change my tax person after 20 plus years of having someone fly from AZ to Simi each year to do my taxes, so i was actually very stressed about having a new experience, but Paula made it seamless! Very happy with NumberCrunchers!

Maria L

Simi Valley, CA

Great place to get your taxes done! I highly recommend Paula Williams and NumberCrunchers. She is very professional, knowledgeable, highly intelligent, very funny and extremely caring. Also the lady at the front desk is super nice and always helpful!

Noosheen Z

Westlake Village, CA

Paula has been handling our nonprofit taxes for years, I trust no one else. She is extremely knowledgeable and understands our needs. She is always available to answer questions. Paula is great to work with, providing straight forward answers and guidance. Paula and her staff always make you feel welcome and that they truly care about you.

Joanne A

Simi Valley, CA

If you are looking for someone who will take care of you 100%+ for your taxes, this is the place to go. I have been coming to Paula since 1999 and I am very happy with her services. Paula is very professional and is always willing to answer your questions in person or via email. In addition, Dee provides the best customer service when scheduling appointments. Their business is a warm and welcoming environment. I highly recommend them for any tax service. I guarantee you will be as satisfied as I have been for the past 16 years.

Vicky B

Los Angeles, CA

Paula is one of the knowledgeable accountants i have ever had the pleasure of doing business with. I would recommend her without reservation!

George H

Simi Valley, CA

My family has used Paula’s services for several years and it has been a very enjoyable experience. She is very patient and makes paying taxes tolerable by bringing humor to the process. We all love talking to D. This is a family business that understands customer service and provides outstanding care for their customers.

Timothy G

Simi Valley, CA

Paula has done my personal and business taxes for several years. Before being referred to her by another satisfied customer, the idea of visiting an accountant was akin to undergoing a root canal while being set aflame. The moment I entered NumberCrunchers, however, I was warmly greeted by Miss Dee (who always remembers to ask after my dogs), and felt that maybe there was hope, after all. Paula exceeded my expectations, and continues to do so, year after year. She is extremely competent, yet eminently approachable (and very community-oriented!). I recommend her highly and unreservedly, and would never go elsewhere.

Stacy C

Moorpark, CA

NumberCrunchers has been doing our personal taxes for several years and they work really hard to give us all the legal advantages we are entitled to. We’ve never had an audit. They should rename the company Creative NumberCrunchers because they truly are creative accountants.

Jeffrey N

Simi Valley, CA

Paula has done my taxes as well as advised me of things concerning all aspects of accounting concerns for almost 10 years. She is great at what she does and I would not go anywhere else. Her and Dee always welcome me like I see them everyday. They always know who I am and that means a lot. Keep up the great work guys.

Edward N

North Hollywood, CA

We entrusted NumberCrunchers with our personal accounting in 2001, and in 2002 Paula helped me establish my corporation. Since then, we have been extremely happy with professional services in a warm and inviting environment.

Patricia C

Thousand Oaks,CA