Business Tax Services for S-Corps, Partnerships & Growing Companies
Year-round tax planning and compliance from CPAs who specialize in pass-through entities. Not just April filing.
Business tax services include tax preparation (Form 1120S for S-Corps, Form 1065 for partnerships, Form 1120 for C-Corps) and tax planning (year-round strategy to reduce taxes). Most CPAs only do preparation. SDO CPA specializes in S-Corps, partnerships, and C-Corps—providing both preparation and proactive planning. Typical S-Corp returns range $1,000-$3,500. Partnership returns start at $1,000. We provide upfront estimates before starting work.
Your CPA Should Do More Than File What You Send Them
Most business tax services work like this: you gather documents in March, send them over, get a PDF back in April. No one calls you in October to plan. No one models scenarios before year-end. No one asks about retirement contributions, reasonable salary optimization, or entity structure.
That’s not tax services. That’s data entry.
If your CPA does “a little of everything,” they specialize in nothing. S-Corps have specific requirements (reasonable salary, K-1 timing, QBI optimization). Partnerships have their own complexity (basis tracking, special allocations, multi-state). Generic preparers miss these opportunities. The result: you pay more in taxes than you should.
We focus on pass-through entities—S-Corps and partnerships are our specialty. We bring you ideas, not just ask for documents. That’s the difference between a tax preparer and a tax advisor.
Our Business Tax Services
S-Corporation Tax Services
Complete Form 1120S preparation plus reasonable salary optimization, QBI maximization, and year-round planning. K-1s to shareholders on time.
Learn more about S-Corporation servicesPartnership Tax Services
Form 1065 preparation with proper basis tracking, special allocations, and multi-state compliance. Partner K-1s that survive IRS scrutiny.
Learn more about Partnership servicesBusiness Tax Preparation
Annual tax preparation for LLCs, S-Corps, and partnerships. Accurate returns filed on time, every time. No last-minute scrambles.
Learn more about Tax PreparationTax Planning Services
Year-round strategy to reduce your tax bill. Entity optimization, retirement planning, year-end moves. Planning, not just compliance.
Learn more about Tax PlanningForm 1120S Preparation
S-Corporation returns with shareholder K-1s, reasonable salary documentation, and QBI analysis. We handle the complexity.
Learn more about Form 1120SForm 1065 Preparation
Partnership returns with partner K-1s, basis tracking schedules, and multi-state allocation. Every partner gets their K-1 promptly.
Learn more about Form 1065C-Corporation Tax Services
Form 1120 preparation for C-Corps. QSBS planning for startups, reasonable compensation analysis, and entity structure optimization.
Learn more about C-Corporation taxesWhy Business Owners Choose SDO
Pass-Through Entity Specialists
S-Corps and partnerships are our specialty. We’re not learning reasonable salary rules on your return. Basis tracking that actually tracks. K-1s that survive IRS scrutiny. We’ve handled hundreds of complex pass-through situations.
Year-Round Planning Available
Tax prep clients get accurate returns, on time. Planning clients get more: quarterly check-ins, a year-end strategy call in October, estimated tax coordination, and proactive advice before decisions—not after. Learn about tax planning engagements.
Big Four Background, Small Firm Access
Former EY and KPMG professionals now serving businesses under $5M. Fortune 500 strategies applied to your company. You talk to the partner who works your return. Response within 1 business day, not 1 week.
Is This Right for Your Business?
Good Fit
- S-Corporation, partnership, or C-Corporation
- Revenue $250K-$10M annually
- Want proactive tax planning, not just preparation
- Value accuracy and strategy over lowest price
- Ready for a CPA who brings ideas, not just asks for documents
Not the Right Fit
- Sole proprietorships under $100K (not yet, but we can help plan the S-Corp election)
- Looking for the cheapest tax prep available
- Want a CPA who just files what you send them
- Need audit or assurance services (not our focus)
How It Works
Step 1: Discovery Call
We assess your current structure, review prior returns, and identify opportunities. You’ll leave knowing exactly where we can help.
Step 2: Year-Round Engagement
Quarterly check-ins. Year-end planning call in October. Estimated tax coordination. You’re never scrambling in March.
Step 3: Filing & Optimization
Returns prepared accurately and on time. K-1s to partners promptly. Post-filing review to identify next year’s opportunities.
Guides & Tools
Complete guide to S-Corp taxation, elections, and optimization strategies
Partnership tax rules, basis tracking, and distribution planning
C-Corp taxation, double taxation strategies, and QSBS benefits explained
Compare S-Corps, C-Corps, partnerships, and sole proprietorships
Estimate your S-Corp tax savings vs. sole proprietorship
Calculate your Section 199A qualified business income deduction
Transparent pricing for tax preparation and planning services
Frequently Asked Questions
What’s the difference between tax preparation and tax planning?
Tax preparation is recording what happened and filing returns. Looking backward. Tax planning is modeling scenarios and making decisions to reduce future taxes. Looking forward. Most CPAs only do preparation. We do both. If your CPA only calls you in March, you’re only getting preparation.
How much do business tax services cost?
S-Corp returns (Form 1120S) typically range $1,200-$3,500 depending on complexity. Partnership returns (Form 1065) start at $1,000 based on partner count and allocations. We provide upfront estimates before starting. No surprise bills. See our pricing page for more detail.
Should my S-Corp use the same CPA as my personal taxes?
Yes. Your S-Corp passes through to your personal return via K-1. Using separate CPAs creates coordination gaps for reasonable salary, retirement contributions, and QBI optimization. One CPA sees the complete picture and can optimize across both returns.
When should I convert my LLC to an S-Corp?
Generally when net self-employment income consistently exceeds $50,000-$60,000 annually. The S-Corp election can save 15.3% in self-employment tax on a portion of your income. But there are costs (payroll processing, additional filings) that need to offset the savings. We model both scenarios before recommending. Try our S-Corp calculator for an initial estimate.
Do you handle multi-state business tax returns?
Yes. About 40% of our clients operate in multiple states. We handle state allocation, nexus analysis, and multi-state compliance as part of your engagement. Common scenarios: Texas business with California sales, partnership with partners in multiple states, businesses with remote employees.
Do you offer services beyond annual tax preparation?
Yes. Beyond annual return preparation, we offer year-round tax planning engagements. Planning clients get quarterly check-ins, a year-end strategy call in October, estimated tax coordination, entity optimization analysis, and access for questions throughout the year. Tax preparation is a transaction. Tax planning is a relationship—planning clients typically see greater savings because we’re working proactively, not reactively.
Related Services
Ready to Work With Business Tax Specialists?
Stop overpaying because your CPA doesn’t specialize in your entity type. Get year-round planning, not just April filing.
Schedule a ConsultationOr call us directly: (972) 296-0981
SDO CPA LLC is a licensed CPA firm in the state of Texas. Services described are subject to engagement terms. Results vary based on individual circumstances. Per Texas State Board of Public Accountancy Rule 501.82, this communication does not guarantee outcomes or imply ability to influence any government agency. AICPA member firm.