Ontario, CA CPA & Accounting Services
Tax resolution, audit defense, and CPA-supervised bookkeeping for Ontario businesses, from a Treasury-authorized firm minutes away in Rancho Cucamonga.
G&S Accountancy serves Ontario, CA businesses with tax resolution, EDD/IRS/CDTFA audit defense, bookkeeping, and advisory. The firm is led by AJ Singh, CPA, EA, and located minutes from Ontario at 8300 Utica Ave, Suite 283, Rancho Cucamonga.
A local partner nearby
Accounting built for Ontario’s logistics economy
Ontario is the logistics and distribution engine of the Western United States. With Ontario International Airport, direct access to the I-10 and I-15, and quick routes to the Ports of Los Angeles and Long Beach, the city has become one of the nation’s busiest big-box distribution corridors, home to operations like Cardinal Health, the QVC distribution center, AutoZone, and Nordstrom.
That economy creates specific accounting and tax pressure: multi-state fuel and sales-tax exposure, heavy payroll and contractor use that draws EDD scrutiny, import and tariff cost complexity, and thin-margin operations that live and die by clean cash-flow reporting. G&S Accountancy works with the warehousing, transportation, manufacturing, and service businesses navigating exactly that.
We are based in neighboring Rancho Cucamonga, a short drive from Ontario, so you get a genuinely local CPA firm that understands the Inland Empire, without routing your work out of state.
How we help Ontario businesses
One Treasury-authorized CPA firm for the tax, compliance, and accounting work that keeps Ontario businesses running.
Tax Resolution
IRS, FTB, EDD, and CDTFA relief: installment agreements, penalty abatement, levy release, Offers in Compromise, and unfiled returns.
Learn more →Audit Defense
Representation for EDD payroll and worker-classification audits, IRS examinations, and CDTFA sales-tax audits.
Learn more →Bookkeeping
CPA-supervised monthly bookkeeping, catch-up and cleanup, and QuickBooks Desktop to Online migration in flat-rate packages.
Learn more →Trucking & IFTA
Fuel-tax and mileage workflows, IFTA preparation, and Federal Excise Tax support for carriers and logistics operators.
Learn more →Tax Preparation & Planning
Business and individual tax preparation with year-round planning to lower what you legally owe.
Learn more →Reviews & Financial Statements
Compiled, reviewed, and audited financial statements for lenders, bonding, and stakeholders.
Learn more →Built for the local economy
Industries we serve in Ontario
Ontario’s economy is dominated by logistics, warehousing, manufacturing, and the service businesses that support them. We concentrate where local operators face the most tax and compliance risk.
Logistics & Warehousing
Sales-and-use-tax (CDTFA) exposure, inventory accounting, and clean reporting for the distribution operations that define Ontario.
Transportation & Trucking
IFTA, fuel tax, and Federal Excise Tax workflows for carriers moving freight through the Ontario corridor.
Manufacturing & Food Processing
Cost accounting, R&D and equipment planning, and financial statements for Ontario’s manufacturers.
Import & Distribution
Tariff and landed-cost tracking and entity planning for businesses moving goods through the ports and airport.
Retail & Service
Bookkeeping, payroll, and sales-tax compliance for the consumer businesses serving Ontario’s workforce.
Staffing & Contractor-Heavy Employers
Worker-classification review and EDD audit defense for employers that rely on independent contractors.
Why Ontario businesses choose G&S
A logistics-savvy CPA next door
Ontario businesses often deal with more than the IRS. Fuel tax, sales tax, and worker classification bring the FTB, CDTFA, and EDD into play, and each has its own rules and its own auditors. G&S is authorized to represent you before all of them.
We understand the logistics and distribution model because we already serve the carriers and warehouses across the Inland Empire. That means less time explaining your business and more time solving the problem, whether it is an EDD audit, a sales-tax assessment, or books that have fallen behind.
- Led by AJ Singh, CPA, EA, a U.S. Treasury-authorized practitioner
- Representation before the IRS, FTB, EDD, and CDTFA
- 15+ years serving Inland Empire businesses
- Bilingual support in English and Spanish
- Based minutes from Ontario in Rancho Cucamonga, easy to reach in person or remotely
What clients say
Trusted by clients across the Inland Empire
“Very responsive especially, Lorena. She helped me numerous times navigating tough tax resolutions with IRS and FTB in a timely manner. She is the problem solver!!”
“I have been with this company for quite some time now, about 10 years, and the staff is amazing. They respond quickly and won’t stop reaching out until the job is done.”
“Quality service, always on time. Lorena Contreras atiende y explica muy bien en Español.”
“Very proactive and will consistently check up with you to ensure everything goes smoothly.”
Ontario CPA FAQ
Ontario accounting questions, answered
Common questions from Ontario business owners about working with G&S Accountancy.
Book a Free Consultation →Our office is in neighboring Rancho Cucamonga at 8300 Utica Ave, Suite 283, just a short drive from Ontario. We serve Ontario clients both in person and remotely through secure cloud accounting, so distance is never a barrier.
Your Ontario CPA is a call away
Book a free consultation and find out how G&S can help your Ontario business with tax, audit defense, bookkeeping, and advisory.