Sierra-Larregui Tax Group

Focused on lowering taxes & saving time for individuals and small business'

Our Goal

To make sure you pay your fair share in taxes, save you time by taking care of your bookkeeping, keep you out of the governments radar by filing all the proper paperwork correctly and on time, and help you with business and tax planning.

Our Services


We will set up an excellent chart of accounts, clean all of your old bookkeeping up, and make sure that your financials are accurate every month so that you can make the decisions that count.

Individual & Small Business Tax Preparation

SL Tax Group is really focused on small businesses, and entrepreneurs. No matter what business entity you are, we can help you get your books in order and complete your taxes every year.

Tax & Business Planning

Is it time to take your sole proprietorship and make it into an LLC or S-Corp? We can help you answer that question.  

What Makes Us Different

The current tax code with the recent tax reform laws are set-up for business owners, and we utilize our expert knowledge of bookkeeping and taxes to take full advantage of all tax deductions, tax credits, and tax exemptions available to business owners. We also specialize in complex individual tax returns revolving around the purchasing and/or sale of a home or real estate property, rental properties, inheritances, multiple state tax returns, estates and trusts

Although we are located in the in Brea, California, we provide services to clients nationwide using today’s technology:

  • Online Video Meetings (Zoom, Skype, etc.)
  • Electronic Signatures
  • Secure Cloud Document
  • Storage Cloud based Accounting Software

More importantly, all of our online tools can be used directly through your mobile device! So you don’t need a computer.

With clients across the United States, we have the proven ability to work 100% virtual for your convenience.

You can choose to come into our office for an in-person appointment or to have your taxes done 100% remotely from the comfort of your home.

Who We Are

Billy J. Larregui, EA

Monica Sierra-Larregui, CRTP

Get In Touch


411 West Lambert Road

Suite 400

Brea, CA 92821


(888) 686-3450


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