Entity-Specific Expertise
Returns fitted to your corporation, S-Corp, or partnership.
Business Tax Filing
Business Tax Returns — Form 1120 & 1065
Forms 1120, 1120-S, and 1065 prepared to reduce your liability and keep your company completely audit-ready.
Overview
Business Tax Returns — Form 1120 & 1065, done properly
Business returns carry serious consequences. The right elections and deductions can save thousands, while a missed filing brings penalties that build up quietly until they suddenly don't.
We prepare your entity return — corporation, S-Corp, or partnership — keeping both compliance and strategy in mind, and align it with the owners' personal returns so the full picture is optimized.
Every engagement is backed by our accuracy commitment and handled with strict confidentiality.
The Benefits
What you get with Stone Mark
Real advantages that add up to less stress, more savings, and total confidence.
Liability Minimized
Smart elections and deductions that reduce what you owe.
Audit-Ready Records
Records and filings that stand up to scrutiny.
Deadline Management
Federal, state, and quarterly deadlines tracked for you.
K-1s Prepared
Partner and shareholder K-1s issued accurately and on schedule.
Coordinated Filings
Business and owner returns optimized as one, not separately.
Who It's For
Is this service right for you?
If any of these sound familiar, we should talk. A free consultation is the fastest way to find out how we can help.
- C-Corporations filing Form 1120
- S-Corporations filing Form 1120-S
- Partnerships and multi-member LLCs filing Form 1065
- Startups filing their first business return
- Established businesses seeking a more strategic preparer
- Owners who want business and personal taxes done together
How It Works
A clear path from start to finished
Our process keeps everything simple, transparent, and on schedule.
1
Free Consultation
We start with a no-cost call to understand your situation, goals, and deadlines.
2
Secure Document Collection
Share your paperwork through our encrypted portal — we send a tailored checklist.
3
Preparation & Review
Our advisors do the work and run a multi-point accuracy review.
4
Your Approval
You review and approve before anything is submitted.
5
Filing & Ongoing Support
We file, confirm acceptance, and stay available all year.
Questions
Business Tax Returns — Form 1120 & 1065 FAQs
C-Corps file Form 1120, S-Corps file Form 1120-S, and partnerships and multi-member LLCs file Form 1065. Single-member LLCs usually report on the owner's Schedule C. We confirm which applies to you.
S-Corp and partnership returns are generally due March 15th, while C-Corp and individual returns are due April 15th. Extensions are available, but any tax owed is still due on the original date.
Yes. We work out your estimates to keep you compliant and free of underpayment penalties, and we send reminders ahead of each due date.
Regularly. We bring businesses up to date on unfiled returns, rebuilding records where needed and working to reduce penalties.
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Ready When You Are
Let's get this handled properly
Book a free consultation and see how much easier working with the right advisors can be.
- Free, no-obligation consultation
- Flat, upfront pricing — no surprises
- A reply within one business day
Book a Free Consultation
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