Business tax returns, prepared and filed by licensed CPAs.
Federal and state returns for C-Corps, S-Corps, partnerships and LLCs, including foreign-owned LLCs. We work from clean books, so the numbers on your return hold up.
Returns & deadlines
Which return your business files, and when.
Federal due dates for the 2026 tax year, for businesses on a calendar year.
| Business type | Federal return | Due | With extension |
|---|---|---|---|
| S-CorporationIncluding LLCs that elected S-Corp status | Form 1120-S | Mar 15, 2027 | Sep 15, 2027 |
| PartnershipIncluding multi-member LLCs | Form 1065 | Mar 15, 2027 | Sep 15, 2027 |
| C-Corporation | Form 1120 | Apr 15, 2027 | Oct 15, 2027 |
| Foreign-owned single-member LLC | Form 5472 + pro forma 1120 | Apr 15, 2027 | Oct 15, 2027 |
| U.S.-owned single-member LLCReported on the owner's personal return | Schedule C (Form 1040) | Apr 15, 2027 | Oct 15, 2027 |
An extension (Form 7004 for businesses) gives more time to file, not more time to pay. Tax owed is still due by the original date. State deadlines vary and are handled as part of every engagement.
What's included
More than the return itself.
Every business tax engagement covers the federal return plus the filings that go with it.
- ✓Federal return
Form 1120, 1120-S or 1065, prepared from your year-end books.
- ✓State returns
Income and franchise tax returns for the states you operate in.
- ✓Owner K-1s
Schedule K-1s for each partner or shareholder, sent on time for their personal returns.
- ✓Extensions when needed
Form 7004 filed before the deadline if your books are not ready.
- ✓1099 filing
1099-NEC and 1099-MISC for contractors and vendors you paid during the year.
- ✓Estimated tax plan
Next year's quarterly estimates worked out, so there are no surprises.
- ✓S-Corp election advice
Whether an S-Corp election (Form 2553) would save you tax, and a reasonable salary if it does.
- ✓IRS notice help
We read and answer IRS or state notices about the returns we prepared.
How filing works
From documents to accepted return.
You approve every return before it goes to the IRS.
Kickoff
A short call and a document checklist for your business.
Books review
We check that the year is closed and reconciled, and fix what is not.
Prepare
Federal and state returns drafted, with K-1s for each owner.
CPA review
A licensed CPA reviews the return line by line.
Your approval
We walk you through the return. You sign the e-file authorization.
E-file
Filed with the IRS and states. You get accepted copies for your records.
What to send us
Your document checklist.
If we already keep your books, we have most of this.
- Last year's federal and state returns
- Access to your books, or year-end financial statements
- Bank and credit card statements for the full year
- Payroll reports (Forms 941, 940, W-2 summary)
- 1099 forms your business received
- Purchases or sales of equipment, vehicles or property
- Loan statements showing year-end balances and interest
- Ownership changes and owner contributions or draws
- States where you have employees, property or sales
- IRS or state notices received during the year
Books not ready for tax season?
We clean up and close the year first, then prepare the return. If you are behind on past years, we catch up the books and file any outstanding returns.
FAQ
Business tax questions.
My business had no income this year. Do I still need to file?
Usually yes. Corporations, S-Corps and partnerships generally must file a return every year they exist, even with no activity. Foreign-owned single-member LLCs must file Form 5472, and the IRS penalty for missing it starts at $25,000.
I own a U.S. LLC but live outside the U.S. Can you help?
Yes. We prepare Form 5472 with the pro forma Form 1120 for foreign-owned single-member LLCs, and partnership returns for LLCs with more than one owner.
Should my LLC elect to be taxed as an S-Corp?
It can lower self-employment tax once profit is high enough to support a reasonable salary for the owner. We run the numbers for your business before recommending it.
Does an extension give me more time to pay?
No. An extension gives you more time to file only. We estimate what you owe and help you pay it by the original due date to avoid penalties and interest.
Can you file returns for past years I missed?
Yes. We rebuild the books for each missing year and file the outstanding federal and state returns.
Contact
Book a free consultation.
Tell us a little about your business and we will reply within one business day.