Phone: 909-466-6900

Tax Preparation Services
Bookkeeping Services
About CTB
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As Rancho Cucamonga's tax and bookkeeping specialists, we offer free consultations. Please give us a call at (909) 466-6900 for an appointment.


2013 - 2014 Tax Preparation, IRS Problem Resolution and Bookkeeping Specialist

Rancho Cucamonga's cost-effective tax preparation and bookkeeping service.

Appointments available! Call (909) 466-6900.

Cornerstone is an office of professional tax preparers who are friendly, knowledgeable and have a wide range of tax expertise including small business and IRS problem resolution.

Tax services:

  • Tax Preparation
  • Tax Planning
  • Tax Consulting
  • IRS problem resolution
  • Tax Audit Representation
  • Review of Prior Year's Taxes

Services for:

  • Individuals
  • Partnerships
  • Limited Liability Companies
  • Non-profit organizations

Our associates constantly receive training on new federal, state, and local tax law changes affecting individuals and businesses.

Why use a professional service?

It is always better to have your taxes done by a professional tax preparer. A professional tax preparer has all of the knowledge and tools needed to ensure that your tax deductions are maximized to the extent allowable by law, saving you time and money.

We have all the tools and strategies needed to help you minimize your tax payments. Since we are a financial services firm, we will assist you in maximizing your potential income.

Our services do not end after tax season! We are also available to help you with any of your bookkeeping and financial concerns all year long.

Call us at (909) 466-6900 regarding tax preparation or reducing excessive taxes, bookkeeping services, sales tax tracking and returns, filing a 1099 or audit help.

Qualified tax professionals

Kathryn Dunn is an Enrolled Agent (EA), a federally-authorized tax practitioner who has technical expertise in the field of taxation and who is empowered by the U.S. Department of the Treasury to represent taxpayers before all administrative levels of the Internal Revenue Service for audits, collections, and appeals.

What does the term “Enrolled Agent” mean?

“Enrolled” means to be licensed to practice by the federal government, and “Agent” means authorized to appear in the place of the taxpayer at the IRS. Only Enrolled Agents, attorneys, and CPAs may represent taxpayers before the IRS. Learn more about Enrolled Agents at the IRS website.

What are the differences between Enrolled Agents and other tax professionals?

Only Enrolled Agents are required to demonstrate to the IRS their competence in matters of taxation before they may represent a taxpayer before the IRS. Unlike attorneys and CPAs, who may or may not choose to specialize in taxes, all Enrolled Agents specialize in taxation. Enrolled Agents are the only taxpayer representatives who receive their right to practice from the U.S. government (CPAs and attorneys are licensed by the states).

How can an Enrolled Agent help me?

Enrolled Agents advise, represent, and prepare tax returns for individuals, partnerships, corporations, estates, trusts, and any entities with tax-reporting requirements. Enrolled Agents’ expertise in the continually changing field of taxation enables them to effectively represent taxpayers audited by the IRS. Want to know more? Contact us at (909) 466-6900.

Cornerstone Tax & Accounting is an authorized e-File Provider.

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8480 Red Oak Street, Rancho Cucamonga CA 91730-3815
Phone: (909) 466-6900 | Fax: (909) 533-2159 | Email: RS

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