We are a full-service Accounting firm licensed in AZ. We offer a broad range of services for business owners, executives, and independent professionals. We are affordable, experienced, and friendly. Our firm is one of the leading firms in the area. By combining our expertise, experience and the energy of our staff, each client receives close personal and professional attention. Our high standards, service and specialized staff spell the difference between our outstanding performance, and other firms. We make sure that every client is served by the expertise of our whole firm. Our firm is responsive. Companies who choose our firm rely on competent advice and fast, accurate personnel. We provide total financial services to individuals, large and small businesses and other agencies. Because we get new business from the people who know us best, client referrals have fueled our growth in the recent years. Through hard work, we have earned the respect of the business and financial communities. This respect illustrates our diverse talents, dedication and ability to respond quickly. An accounting firm is known for the quality of its service. Our firm's reputation reflects the high standards we demand of ourselves. Our primary goal as a trusted advisor is to be available to provide insightful advice to enable our clients to make informed financial decisions. We do not accept anything less from ourselves and this is what we deliver to you. We feel it is extremely important to continually professionally educate ourselves to improve our technical expertise, financial knowledge and service to our clients. Our high service quality and "raving fan" clients are the result of our commitment to excellence. We will answer all of your questions, as they impact both your tax and financial situations. We welcome you to contact us anytime.
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Tina S.


Provided by YP.com

Had outgrown our current accountant and was referred to Deirdre with BASC. BASC has far exceeded my expectations and have come to trust Deirdre's counsel and appreciate her honesty and straightforward candor when it came to our taxes and accounting needs. She even helped me find a payroll company that fit our company's needs as well. Deirdre and her team are readily available and are true professionals. I highly recommend BASC for your tax/accounting/payroll needs.

Brig C.


Provided by YP.com

BASC Expertise has taken care of all our business needs. As a small business owner I don't know where I would be with out BASC. They have saved us money, given very solid financial advise, and very professionally taken care of our tax needs. I highly suggest BASC as they are one of the most professional firms I've come across.

Jeff P.


Provided by YP.com

Starting a new business and managing the associated payroll, tax, and accounting tasks can be a scary thing. There are so many things to learn and, unfortunately, so many ways to inadvertently set yourself up for future trouble, even if you have experience doing your own taxes for many years (like I did). Fortunately for us, we found BASC. Having an experienced and attentive team to help us plan, navigate, and succeed gave us the peace of mind to focus on what was most important….growing our business. Deirdre and her staff are skilled, responsive, and friendly. They are as invested in our success as we are, and we are proud to have them as part of our business team.

Charlie M.


Provided by YP.com

Deirdre and the team at BASC are the best at what they do. I have hired and worked with many different people and operations and I have to say the BASC team is by far the best there is. They are fast, efficient and an absolute pleasure to work with. I highly recommend Deirdre and her team for anyone looking for a group of true professionals.

Sharlene K.


Provided by YP.com

BASC has taken care of our books and taxes for my cleaning business, Time 2 Clean, LLC. for more than a couple years now and I wouldn't change to a different company for anything. They are honest, tell you the facts as they are, and always go above and beyond with their services. They have helped us out more than we have room to type here. Deirdre is the BEST.

Ruth F.


Provided by YP.com

I was recommended to use Basc Expertise by a fellow co worker and I have been so impressed by Deirdre and Sarah. Deirdre is so personable and easy to work with. She is readily available and gives great advice and is so knowledgeable. It is a pleasure to work with her and Sarah.


Tera W.


Provided by YPmobile

I did a Google search for local Small business tax specialists and I got more than I asked. Basc is great if you need someone to hold your hand! She completely took care of getting my business completely legal, and I couldn't be happier. takes a lot of stress off!

Justin G.


Provided by YP.com

BASC Expertise has been amazingly helpful in everything from setting up our books and monthly reporting to tax preparation and filing. They have even gone the extra mile in providing insight that has helped us to strategically plan for our business growth. Deirdre and Sarah at BASC have truly been an integral part of our success. I highly recommend BASC Expertise as a wonderful resource for your many of your business needs.

Cody S.


Provided by YP.com

BASC has been taking care of me for years and they always do a bang up job!! I don't just hear from them when its tax time. They communicate with me throughout the entire year helping me and saving me money.

Jeff K.


Provided by YP.com

I switched to BASC a fews years ago because of the personalized service and attention. Dierdre always makes her self available at any time. I use BASC for personal and business accounting and highly recommend them.

More Business Info

Regular Hours
Mon - Fri:
Sat - SunClosed
* Bookkeeping * Business Tax Preparation * CPA Services * Estate Planning * High End Tax Preparation * Payroll * Personal Financial Planning * Small Business Accounting * Tax Return Preparation
Payment method
cash, check, all major credit cards
Baseline and Greenfield in Mesa
Social Links
Bookkeeping, Accounting Services, Financial Services, Tax Return Preparation
Other Information

Parking: Lot