Your C-corporation reports its own income.
A C-corporation is a separate taxpayer. It files Form 1120 each year and pays federal income tax at the flat corporate rate on its own profit, before any dividends reach shareholders. We prepare and e-file the return from your financials, confirm your deadline, and flag the estimated payments that keep penalties away.
The corporation is its own taxpayer.
Form 1120 is the annual federal income tax return for a C-corporation. Unlike a partnership or an S-corporation, a C-corporation does not pass its income through to owners for tax; it computes its own taxable income and pays federal income tax at the flat corporate rate on that profit. Shareholders are then taxed again on any dividends they receive, which is the double taxation people describe with C-corporations. The return reports income, deductions, credits, and the resulting tax, and it is filed every year the corporation exists, even in a year with no profit.
So what does the finished filing represent? Here it is.
A complete corporate return, e-filed from your books.
Form 1120 is built from your financial records: income, cost of goods sold, deductions, credits, and the schedules that support them. The result is a return showing the corporation's taxable income and the tax due at the corporate rate. Getting there accurately depends on clean books and the right supporting schedules, which is where most of the work is. We prepare the return from your financials, review it, e-file it, and store the acknowledgment, so you have a complete and defensible filing on record.
Not every business files an 1120. Here is who does.
C-corporations file 1120. Other structures file elsewhere.
Form 1120 is specifically the C-corporation return. Your tax structure determines whether it is the right form. Here is the line.
File Form 1120 if
- You are a corporation taxed as a C-corporation, the default for a corporation.
- Your LLC has elected to be taxed as a C-corporation.
- The entity exists during the year, even with no income.
- You have not made, or have revoked, an S-corporation election.
File a different return if
- You have a valid S-election. That is Form 1120-S.
- You are a multi-member LLC or partnership. That is Form 1065.
- You are a single-member LLC with no corporate election. Report on the owner's return.
- You are a tax-exempt nonprofit. That is the Form 990 series.
A common question: a C-corporation must still file Form 1120 for any year it exists, even if it had no activity or no profit. Skipping the return in a quiet year is a frequent and avoidable mistake, because the filing obligation follows the entity, not the income. We confirm your tax classification and filing obligation before the deadline so a dormant year does not turn into a missed return.
Right return for you? Here are the dates and penalties.
The corporate calendar is unforgiving.
These figures were verified against current IRS guidance. The ones that adjust each year are noted.
Dates in hand? Here is how the filing runs.
From clean books to an accepted return.
The accuracy of an 1120 comes from the records behind it. Here is the sequence from financials to a filed return.
Assemble the financials
We start from your income statement, balance sheet, and records for the year, the basis for every figure on the return.
We prepare the return and schedules
We complete Form 1120 with the supporting schedules your situation requires, computing tax at the corporate rate.
Review and pay
You review the return, and any tax due is paid by the original deadline so a late-payment penalty and interest do not start.
We e-file and store the acknowledgment
We submit the return electronically, capture the IRS acknowledgment, and set next year's dates on your calendar.
The return is only as good as the records. Here is what we bring to it.
Accurate, on time, and connected to the rest.
A corporate return is where accuracy matters most and where a missed estimated payment quietly adds up. The value here is a return prepared from clean records, filed on time, with the payment timing handled and the whole federal picture in one place.
Right schedules, right tax
- We build the return from your actual financials, not estimates.
- We attach the supporting schedules your situation requires.
- We flag estimated-payment timing so penalties do not accrue.
Nothing filed in isolation
- Need more time? We file the 7004 extension first.
- Deadlines sit on your compliance calendar.
- The return and its acknowledgment stay in one vault.
Flat preparation fee shown up front. See what it costs →
The corporate return connects to a handful of related filings. Here is the road.
The return sits in a wider federal picture.
The 1120 connects to your federal ID, your extension, your books, and the tax preparation behind it. They live on one platform, so the corporate return is one part of a coordinated whole.
Number it, extend it, file it, and keep the books behind it, all inside File.Business. One platform holds the corporate return and everything that feeds it.
The questions corporations ask about Form 1120.
When is Form 1120 due?
For a calendar-year C-corporation, Form 1120 is due on the 15th day of the fourth month after the tax year ends, which is April 15. Corporations with a fiscal year use the 15th day of the fourth month after their year-end instead, with a special earlier date for corporations whose year ends June 30. Filing Form 7004 by that date gives an automatic six-month extension, moving a calendar-year deadline to October 15. We confirm your exact dates based on your fiscal year.
Does a C-corporation pay tax, or do the owners?
The corporation pays. A C-corporation is a separate taxpayer that computes its own taxable income and pays federal income tax at the flat corporate rate. Shareholders are then taxed again on dividends they receive, which is the double taxation associated with C-corporations. This is the key difference from an S-corporation or partnership, where income passes through to owners and the entity itself generally pays no federal income tax.
Do I still file if the corporation had no income?
Yes. A C-corporation must file Form 1120 for every year it exists, even a year with no activity or no profit. The filing obligation follows the entity, not the income, so a quiet year still requires a return. Failing to file in a dormant year is a common and avoidable mistake. If the corporation is truly finished, the way to end the obligation is to formally dissolve it, not to simply stop filing.
What are the penalties for filing or paying late?
They are separate and can stack. The late-filing penalty is five percent of the unpaid tax for each month the return is late, up to twenty-five percent, with a minimum penalty if the return is more than sixty days late. The late-payment penalty is half a percent of the unpaid tax per month, up to twenty-five percent, plus interest. Because an extension moves only the filing date, paying by the original deadline is what avoids the payment penalty.
What are estimated taxes, and does my corporation owe them?
A C-corporation that expects to owe federal income tax generally pays it in quarterly estimated installments during the year, rather than all at once with the return. Underpaying those installments can bring its own penalty, separate from the late-filing and late-payment penalties on the return itself. Because the thresholds and due dates are specific, we look at your expected tax and flag whether estimated payments apply and when, so you are not caught short at filing time.
Can Form 1120 be e-filed?
Yes, and many corporations are now required to file electronically rather than on paper. E-filing returns an acknowledgment that the IRS received the return, which is useful proof of timely filing. We e-file wherever it is available, which is the standard path for corporate returns, and store the acknowledgment with your records. If your specific situation requires a different method, we handle that correctly.
What if I want to avoid double taxation?
Many small businesses elect S-corporation status precisely to avoid the corporate-level tax, so that income passes through to owners and is taxed once. That is a different return, Form 1120-S, and it requires a valid S-election. Whether the C-corporation or S-corporation path is better depends on your situation, including plans to raise investment, since some investors prefer C-corporations. We can help you understand the trade-off before you decide.