Professional tax and accounting firm serving Portland and Hazelwood, offering personalized tax strategy, bookkeeping, payroll, and CFO services for startups and small businesses.
Advanced Tax Consulting, founded over 20 years ago by Theban L Tonnesen, EA, LTC, provides expert tax strategy and financial advisory services to growing businesses. With a 25-year career that includes experience as a Tax Manager and senior advisor, the founder has guided construction firms, startups, and expanding companies through complex financial and compliance challenges.
The firm combines technical tax knowledge with CFO-level insight to help business owners gain clarity, improve cash flow, and strengthen financial systems. Services include business tax preparation, tax advisory, fractional CFO services, business startups support, bookkeeping, payroll, and QuickBooks consulting. The firm serves Portland, Hazelwood, and surrounding East Portland communities, and is committed to year-round support, proactive financial management, and staying current with tax laws and IRS regulations.
Over 20 years of corporate and individual tax return preparation experience
Personalized strategies tailored to your business
Certified Tax Strategists and QuickBooks ProAdvisors on staff
Year-round support and responsive team
Free 30-minute consultation
Fractional CFO services for growing businesses
Tax relief and resolution services for back taxes and IRS issues
Services
Small Business Accounting
Customized accounting solutions for startups and growing businesses in Portland and Hazelwood, including financial reporting, cash flow management, and tax planning.
Financial reportingCash flow managementTax planningBudget preparationChart of Accounts and General Ledger setupInternal controls for fraud preventionQuarterly, monthly, and annual financial statementsUse and sales tax processingProfit statements and balance sheetsCustom financial reportsBusiness tax returnsOutsourced CFO services
Bookkeeping Services
Professional bookkeeping to keep your financial records organized and up-to-date, supporting accurate decision-making and compliance.
Organized financial recordsAccurate financial dataSupport for tax planningOperational efficiency
Payroll
Comprehensive payroll management services to ensure accurate and timely payment processing and compliance.
Accurate payment processingTax complianceTimely payroll delivery
Fractional CFO Services
Access CFO-level financial insight and strategy without the full-time cost, tailored for growing businesses.
Comprehensive business tax preparation services to ensure compliance and maximize deductions.
Accurate tax filingMaximized deductionsCompliance assurance
Tax Advisory
Strategic tax advisory services to help businesses navigate tax laws and optimize their tax positions.
Tax strategyRegulatory guidanceProactive planning
Credentials & Certifications
Enrolled Agent (EA)
Licensed Tax Consultant (LTC)
Certified Tax Strategist
QuickBooks ProAdvisor
Reviews
Rating
5
★★★★★
Reviews
23
"Friendly, efficient, and explains things well."
Frequently Asked Questions
Why should I pay for tax preparation when I can do it myself? +
Making just one mistake on a tax return can cost you thousands of dollars in refunds. Paying for professional tax preparation reduces your chance of audit and assures that you are getting every tax deduction and tax credit you deserve. Professional tax preparation pays for itself many times over. It's an investment worth every penny.
How long does it take to have my taxes professionally prepared? +
Typical turnaround time is 1-2 weeks, but sometimes it can be as fast as a couple of days.
Do you have the experience to do my taxes right? +
With over 20 years of corporate and individual tax return preparation experience you can be sure that we have the knowledge to prepare your tax returns accurately and completely.
What types of businesses do you serve? +
We serve startups, small businesses, and medium-sized businesses, as well as individuals and non-profit organizations.
Do you offer year-round support? +
Yes, we are available year-round to answer questions and provide insight when you need it most.
What industries do you specialize in? +
We have specialized knowledge in Construction, Healthcare, and Real Estate.
Do you provide QuickBooks services? +
Yes, we offer QuickBooks setup, training, tune-up, and answers to QuickBooks questions.
Is the initial consultation free? +
Yes, we offer a free 30-minute consultation for prospective clients.
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