Small Business Tax & Accounting · Phoenix, AZ
Your Business Deserves a Real Tax Partner.
Arnold J Diamond PLLC helps small business owners and their teams cut their tax bill, stay compliant, and focus on growing — not on paperwork.
Trusted Tax Experts Serving Phoenix
We work with small business owners, sole proprietors, LLCs, S-Corps, and their key personnel — from the owner who wears every hat to the office manager handling the books.
Whether it's your first year in business or your fifteenth, we bring the same level of expertise and personal attention to every client — so nothing falls through the cracks at tax time.
Everything Your Business Needs at Tax Time
Business & personal tax preparation, quarterly estimated taxes, and year-round planning to keep more money in your pocket.
Entity selection guidance (LLC, S-Corp, sole prop), payroll tax compliance, and bookkeeping clean-up so your records are audit-ready.
We also handle returns for owners, partners, and key employees — one firm, one relationship, no hand-offs.
Built for Small Business
From startup to established operation, we cover every tax and accounting need your business faces.
Business Tax Returns
S-Corps, LLCs, partnerships, and sole proprietors — prepared accurately and filed on time.
Owner & Employee Returns
Personal returns for business owners and key personnel, coordinated with your business filing.
Quarterly Estimated Taxes
We calculate and help you stay on top of quarterly payments so you avoid penalties.
Entity & Structure Planning
Guidance on the right business structure to minimize your tax burden as you grow.
Bookkeeping Clean-Up
Get your books in order before filing season so nothing surprises you at tax time.
IRS Audit Defense
$1 Million Tax Audit Defense™ included — expert representation if the IRS comes knocking.
$1 Million Tax Audit Defense™
When you file with us, you're backed by a team of tax resolution experts. If you or your business receives a notice or audit from the IRS, we step in — at no additional cost — to guide you through every step of the process.
Call TodayLet's Talk
Ready to stop overpaying and start planning? Reach out and we'll set up a time that works for you.
Phone
(480) 616-4834Email
[email protected]Hours
Open today 09:00 am – 05:00 pm