Trusted advisor meeting with small business owners in a bright Northern California office

Running your own books is costing you more than you think.

Hand off your books, your payroll, and your tax planning. I handle the details. You run your business.

Kim Resso, EA · Enrolled Agent · Northern California

Our Approach

"Most of my clients came to me not because they were failing, but because they were tired of not being sure. Your books should tell you where your business is headed — not just where it's been."
What I Do

Accounting that works the way your business does

From daily bookkeeping to long-range tax planning — personal service, all year long.

Bookkeeping

Accurate records, every month — so there are no surprises at tax time.

Accounting

Financial reporting and analysis to help you make better decisions.

Payroll

Payroll done right, on time, every time — taxes and filings handled for you.

Tax Services

Preparation, consulting, and planning — no surprise bills, ever.

Kim Resso, founder and lead accountant at Ultaxa LLC, Northern California
About Kim

Nearly 20 years of accounting experience, working for you — not a firm.

I started Ultaxa because I wanted to do this work the right way — close to my clients, with enough time to actually know their business. My clients don't have to explain their situation to me every year. I already know it.

Learn More About Kim
Client Feedback

What clients say

"Ms. Resso stands out as our most reliable and trusted partner. She explains complex tax concepts clearly, consistently delivers on time, and her ability to guide our family business through unexpected challenges makes her easy to recommend."

Gurjit Singh GSL Pizza Inc.

Kim and her crew have taken great care of my business, helping us elevate to the next level — from taxes to accounting, they are a great choice for your small business.

Buddy Rausch Tedious Repairs Inc.

Kim with Ultaxa is great! She's super knowledgeable and saved me and my business money.

Kelly Baugh KB Heating & Air Inc.

No surprise tax bills. No missed payroll. No month-end dread.

Just clear numbers and someone who already knows your business.

Schedule a Free Consultation