Business Tax Specialists for S-Corps, Partnerships & C-Corps
SDO CPA helps business owners with S-Corps, partnerships, C-Corps, Schedule C, and multi-entity structures through proactive, year-round tax planning and strategy.
Services That Work Together
Start anywhere. We grow with you.
Outsourced Accounting
Full back-office management: AP, AR, payroll, reporting.
Learn More →Complex Situations Are Our Specialty
S-Corps, Partnerships & C-Corps
- Reasonable salary optimization
- K-1 allocations and basis tracking
- Multi-entity coordination
Sole Proprietors & Schedule C
- Self-employment tax strategies
- Home office deduction optimization
- Business expense maximization
- Entity upgrade analysis
International Tax Compliance
- Form 5471, 5472, 8865, 8858
- FBAR and foreign financial reporting
- GILTI, Subpart F, foreign tax credits
Real Estate Investors
- REPS status qualification
- Series LLC asset protection
- Cost segregation, 1031 exchanges
Tax Preparation & Compliance
- Business returns (1120-S, 1065, 1120)
- Sole proprietor & individual returns
- Multi-state filing
Why Business Owners Choose SDO
Big Four Experience
18+ years including EY and KPMG. We apply Fortune 500 strategy to growing businesses. If you've got multi-entity structures, international compliance, or partnership allocations, we've handled situations 10x more complex.
Year-Round Planning
We start planning in October, not scrambling in March. Quarterly check-ins, proactive strategy, and fast communication all year.
Specialist Focus
We've filed 1,000+ business tax returns across all entity types. It's what we do.
Complex situations are our specialty: multi-state, multi-entity, international. We specialize in exactly this.
Secure, Modern Tools
Your tax documents don't belong in email. We use an encrypted client portal for every upload, download, and signature. All client data is encrypted in storage and transfer, with cloud-based workflow for faster turnaround and real-time access to your financials when you need them.
What Our Clients Say
Trusted by business owners across all entity types: S-Corps, partnerships, C-Corps, Schedule C, and real estate investors nationwide.
"I found SDO CPA when my previous accountant retired. SDO CPA helps me with my complex personal, business, and real estate investments, so I don't have to worry about it. I highly recommend them."
"I'm too busy working with IT clients to worry about my accounting and bookkeeping. SDO CPA saves me from making mistakes, and they handle everything financial-related that I don't know or have time for."
"SDO CPA handles tax preparation across my family and real estate investments. I strongly recommend getting a CPA on your team because their diverse knowledge will save your skin many times. SDO CPA is my go-to CPA."
What Clients Are Saying
"Quick, correct, close to home, friendly service."
"Professional, efficient and takes time to educate on tax laws."
"They kept us up to date with everything and the communication was top tier."
"We have great confidence in SDO for tax filing. Our affairs are handled with privacy and respect."
"Since my previous CPA retired, SDO has done a great job. Even living in another state, I feel like I'm in good hands."
"Everything about your company spells professional. Friendly, efficient, prompt, and accurate."
How It Works
Submit Intake Form
Tell us about your business structure, entity type, and what you're looking for. We'll review your information and reach out within 1-2 business days.
Strategy & Onboarding
We build your tax strategy, clean up any existing issues, and set up your encrypted client portal for secure document exchange. Upfront estimate before we start. No sensitive files over email.
Year-Round Partnership
Monthly or quarterly check-ins, proactive planning, and fast communication. Not just April.
Expert Resources
Guides and calculators for every entity type. Built from 18+ years of real client work.
S-Corporation Tax Guide
Reasonable salary, QBI deduction, distributions. The complete S-Corp playbook.
Read Guide →Partnership Taxation Guide
K-1 allocations, basis tracking, guaranteed payments. What every partner should know.
Read Guide →Schedule C Guide
Deductions, self-employment tax, home office rules. Everything sole proprietors need to know.
Read Guide →Tax Advisory
Year-round planning beats once-a-year filing. See what proactive tax strategy looks like.
Learn More →Retirement Tax Planning
Roth conversions, Solo 401(k), mega backdoor strategies. Tax-smart retirement moves.
Read Guide →C-Corporation Tax Guide
When C-Corp makes sense, QSBS exclusion, and avoiding double taxation.
Read Guide →Starting a Business Guide
Choose the right entity, register your business, and set up your tax obligations from day one.
Read Guide →Self-Employed Tax Guide
Deductions, estimated payments, retirement plans, and health insurance for sole proprietors and freelancers.
Read Guide →Business Entity Tax Guide
Side-by-side comparison of LLCs, S-Corps, C-Corps, and partnerships. Which entity fits your situation.
Read Guide →Based in Texas. Serving Businesses Nationwide.
214 S Main St, Suite 101-C
Duncanville, TX 75116
We work with clients in many states and countries around the world through our secure client portal. Whether you're in Dallas-Fort Worth or across the country, we deliver the same hands-on business tax expertise for all entity types.
Ready for Year-Round Tax Planning?
Tell us about your business. We'll review your situation and reach out within 1-2 business days.
Uploading documents does not create a CPA-client engagement. Returns are used for assessment and pricing purposes only.