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IRS 1120 PDF Form

The IRS 1120 form is a tax return used by corporations to report their income, gains, losses, deductions, and credits to the Internal Revenue Service. This form plays a crucial role in determining a corporation's tax liability. Understanding how to accurately complete the 1120 form is essential for compliance and financial health.

Customize IRS 1120

IRS 1120 PDF Form

Customize IRS 1120

Table of Contents

The IRS 1120 form plays a crucial role in the tax reporting process for corporations in the United States. Designed specifically for C corporations, this form serves as a comprehensive report of a corporation's income, deductions, and tax liability. By filing Form 1120, businesses provide the IRS with detailed information about their financial performance over the tax year. Key components of the form include gross receipts, cost of goods sold, and various deductions that can significantly impact the corporation's taxable income. Additionally, the form requires corporations to disclose their tax credits and any taxes owed. Understanding the nuances of Form 1120 is essential for compliance and can help businesses optimize their tax position. Filing accurately and on time not only avoids penalties but also ensures that corporations can take advantage of available deductions and credits, ultimately impacting their bottom line.

Common mistakes

Incorrect Reporting of Income: Many individuals mistakenly report their business income inaccurately. This can happen due to simple math errors, misclassification of income sources, or failure to include all revenue streams.
Omitting Deductions: Some taxpayers overlook eligible deductions. Common deductions include business expenses such as salaries, rent, and utilities. Failing to claim these can lead to a higher tax liability than necessary.
Errors in Filing Status: Choosing the wrong filing status can have significant implications. Corporations must ensure they are correctly classified as either a C corporation or an S corporation, as this affects tax rates and eligibility for certain deductions.
Inaccurate Information on Officers and Shareholders: Providing incorrect or incomplete information about company officers and shareholders is a frequent mistake. This can lead to issues with compliance and future audits.

Example - IRS 1120 Form

Form 1120

Department of the Treasury

Internal Revenue Service

A Check if:

1a Consolidated return (attach Form 851) .

b Life/nonlife consoli- dated return . . .

2Personal holding co. (attach Sch. PH) . .

3Personal service corp. (see instructions) . .

4 Schedule M-3 attached

		U.S. Corporation Income Tax Return							OMB No. 1545-0123
		U.S. Corporation Income Tax Return


For calendar year 2021 or tax year beginning					, 2021, ending		, 20		2021
	▶ Go to www.irs.gov/Form1120 for instructions and the latest information.								2021
	Name						B Employer identification number
TYPE
TYPE	Number, street, and room or suite no. If a P.O. box, see instructions.						C Date incorporated
OR							C Date incorporated
OR
PRINT
PRINT	City or town, state or province, country, and ZIP or foreign postal code						D Total assets (see instructions)
							D Total assets (see instructions)
								$
E Check if: (1)		Initial return	(2)	Final return	(3)	Name change	(4)	Address change

	1a			Gross receipts or sales								. . .		.		1a
		b		Returns and allowances								. . .		.		1b
		c		Balance. Subtract line 1b from line 1a								. . . . . . . . . . . .										1c
	2			Cost of goods sold (attach Form 1125-A)								. . . . . . . . . . . .										2
	3			Gross profit. Subtract line 2 from line 1c								. . . . . . . . . . . .										3
Income	4			Dividends and inclusions (Schedule C, line 23)								. . . . . . . . . . . .										4
Income	5			Interest		. . . . . . . . . . . . . . . . . .						. . . . . . . . . . . .										5
	5			Interest		. . . . . . . . . . . . . . . . . .						. . . . . . . . . . . .										5
	6			Gross rents								. . . . . . . . . . . .										6
	7			Gross royalties								. . . . . . . . . . . .										7
	8			Capital gain net income (attach Schedule D (Form 1120)) . . . .								. . . . . . . . . . . .										8
	9			Net gain or (loss) from Form 4797, Part II, line 17 (attach Form 4797)								. . . . . . . . . . . .										9
	10			Other income (see instructions—attach statement)								. . . . . . . . . . . .										10
	11			Total income. Add lines 3 through 10								. . .		.	. .		. .	.	.	.	▶	11
deductions.)	12			Compensation of officers (see instructions—attach Form 1125-E) .								. . .		.	. .		. .	.	.	.	▶	12
deductions.)	13			Salaries and wages (less employment credits)								. . . . . . . . . . . .										13
	13			Salaries and wages (less employment credits)								. . . . . . . . . . . .										13
	14			Repairs and maintenance								. . . . . . . . . . . .										14
	15			Bad debts								. . . . . . . . . . . .										15
on	16			Rents								. . . . . . . . . . . .										16
on	17			Taxes and licenses								. . . . . . . . . . . .										17
limitations	17			Taxes and licenses								. . . . . . . . . . . .										17
limitations	20			Depreciation from Form 4562 not claimed on Form 1125-A or elsewhere on return (attach Form 4562) . . .																		20
	18			Interest (see instructions)								. . . . . . . . . . . .										18
	19			Charitable contributions								. . . . . . . . . . . .										19
for
for	21			Depletion								. . . . . . . . . . . .										21
instructions	25			Reserved for future use								. . . . . . . . . . . .										25
	22			Advertising								. . . . . . . . . . . .										22
	23			Pension, profit-sharing, etc., plans				. . . . . . . . . .				. . . . . . . . . . . .										23
	24			Employee benefit programs			. . . . . . . . . . . .					. . . . . . . . . . . .										24
(See
(See	26			Other deductions (attach statement)								. . . . . . . . . . . .										26
	26			Other deductions (attach statement)								. . . . . . . . . . . .										26
Deductions	27			Total deductions. Add lines 12 through 26								. . .		.	. .		. .	.	.	.	▶	27
Deductions	28			Taxable income before net operating loss deduction and special deductions. Subtract line 27 from line 11. .																		28
	28																					28
	29a			Net operating loss deduction (see instructions)								. . .		.		29a
		b		Special deductions (Schedule C, line 24)								. . .		.		29b
		c		Add lines 29a and 29b								. . . . . . . . . . . .										29c
and	30			Taxable income. Subtract line 29c from line 28. See instructions .								. . . . . . . . . . . .										30
and	31			Total tax		(Schedule J, Part I, line 11)						. . . . . . . . . . . .										31
Credits,Refundable Payments	31			Total tax		(Schedule J, Part I, line 11)						. . . . . . . . . . . .										31
Credits,Refundable Payments	32			Reserved for future use								. . . . . . . . . . . .										32
	33			Total payments and credits (Schedule J, Part III, line 23) . . . .								. . . . . . . . . . . .										33
	34			Estimated tax penalty. See instructions. Check if Form 2220 is attached								. .		.	. .		. .	.	. ▶			34
	35			Amount owed. If line 33 is smaller than the total of lines 31 and 34, enter amount owed													. . . . . .					35
Tax,	36			Overpayment. If line 33 is larger than the total of lines 31 and 34, enter amount overpaid																		36
Tax,	37			Enter amount from line 36 you want: Credited to 2022 estimated tax ▶														Refunded ▶				37
	37																	Refunded ▶				37
Sign				Under penalties of perjury, I declare that I have examined this return, including accompanying schedules and statements, and to the best of my knowledge and belief, it is true, correct,
Sign				and complete. Declaration of preparer (other than taxpayer) is based on all information of which preparer has any knowledge.																	May the IRS discuss this return
Here
																					with the preparer shown below?
																					See instructions.			Yes	No
			▲Signature of officer							Date	▲		Title								See instructions.			Yes	No
			▲Signature of officer							Date	▲		Title

Paid					Print/Type preparer’s name				Preparer’s signature							Date				Check		if	PTIN
Paid																				Check		if
Preparer																				self-employed
Preparer					Firm’s name ▶														Firm’s EIN ▶
Use Only					Firm’s name ▶														Firm’s EIN ▶
Use Only					Firm’s address ▶														Phone no.
					Firm’s address ▶														Phone no.
For Paperwork Reduction Act Notice, see separate instructions.														Cat. No. 11450Q									Form 1120 (2021)

Form 1120 (2021)				Page 2
Schedule C	Dividends, Inclusions, and Special Deductions (see	(a) Dividends and	(b) %	(c) Special deductions
	instructions)	inclusions		(a) × (b)

1Dividends from less-than-20%-owned domestic corporations (other than debt-financed

stock)

2Dividends from 20%-or-more-owned domestic corporations (other than debt-financed

	stock)	65
		See
3	Dividends on certain debt-financed stock of domestic and foreign corporations . .	instructions
4	Dividends on certain preferred stock of less-than-20%-owned public utilities . . .	23.3
5	Dividends on certain preferred stock of 20%-or-more-owned public utilities . . . .	26.7
6	Dividends from less-than-20%-owned foreign corporations and certain FSCs . . .	50
7	Dividends from 20%-or-more-owned foreign corporations and certain FSCs . . .	65
8	Dividends from wholly owned foreign subsidiaries	100
		See
9	Subtotal. Add lines 1 through 8. See instructions for limitations	instructions

10Dividends from domestic corporations received by a small business investment

	company operating under the Small Business Investment Act of 1958	100
11	Dividends from affiliated group members	100
12	Dividends from certain FSCs	100

13Foreign-source portion of dividends received from a specified 10%-owned foreign

	corporation (excluding hybrid dividends) (see instructions)	100
14	Dividends from foreign corporations not included on line 3, 6, 7, 8, 11, 12, or 13
	(including any hybrid dividends)
15	Reserved for future use
16a	Subpart F inclusions derived from the sale by a controlled foreign corporation (CFC) of
	the stock of a lower-tier foreign corporation treated as a dividend (attach Form(s) 5471)	100
	(see instructions)	100
b	Subpart F inclusions derived from hybrid dividends of tiered corporations (attach Form(s)
	5471) (see instructions)
c	Other inclusions from CFCs under subpart F not included on line 16a, 16b, or 17 (attach
	Form(s) 5471) (see instructions)

17	Global Intangible Low-Taxed Income (GILTI) (attach Form(s) 5471 and Form 8992) . .
18	Gross-up for foreign taxes deemed paid
19	IC-DISC and former DISC dividends not included on line 1, 2, or 3
20	Other dividends
21	Deduction for dividends paid on certain preferred stock of public utilities . . . .
22	Section 250 deduction (attach Form 8993)

23Total dividends and inclusions. Add column (a), lines 9 through 20. Enter here and on page 1, line 4 . . . . . . . . . . . . . . . . . . . . . .

24	Total special deductions. Add column (c), lines 9 through 22. Enter here and on page 1, line 29b

Form 1120 (2021)


Form 1120 (2021)						Page 3
Schedule J		Tax Computation and Payment (see instructions)
Part I—Tax Computation
1	Check if the corporation is a member of a controlled group (attach Schedule O (Form 1120)). See instructions			▶
2	Income tax. See instructions		. . . .	. . .	2
3	Base erosion minimum tax amount (attach Form 8991)		. . . .	. . .	3
4	Add lines 2 and 3		. . . .	. . .	4
5a	Foreign tax credit (attach Form 1118)		5a
b	Credit from Form 8834 (see instructions)		5b
c	General business credit (attach Form 3800)		5c
d	Credit for prior year minimum tax (attach Form 8827)		5d
e	Bond credits from Form 8912		5e
6	Total credits. Add lines 5a through 5e		. . . .	. . .	6
7	Subtract line 6 from line 4		. . . .	. . .	7
8	Personal holding company tax (attach Schedule PH (Form 1120))		. . . .	. . .	8
9a	Recapture of investment credit (attach Form 4255)		9a
b	Recapture of low-income housing credit (attach Form 8611)		9b
c	Interest due under the look-back method—completed long-term contracts (attach
	Form 8697)		9c
d	Interest due under the look-back method—income forecast method (attach Form 8866)		9d
e	Alternative tax on qualifying shipping activities (attach Form 8902)		9e
f	Interest/tax due under section 453A(c) and/or section 453(l)		9f
g	Other (see instructions—attach statement)		9g
10	Total. Add lines 9a through 9g		. . . .	. . .	10
11	Total tax. Add lines 7, 8, and 10. Enter here and on page 1, line 31		. . . .	. . .	11

Part II—Reserved For Future Use

12 Reserved for future use . . . . . . . . . . . . . . . . . . . . . . . . . . .

Part III—Payments and Refundable Credits

13	2020 overpayment credited to 2021	. . . . . . . .		13
14	2021 estimated tax payments	. . . . . . . .		14
15	2021 refund applied for on Form 4466	. . . . . . . .		15	(	)
16	Combine lines 13, 14, and 15	. . . . . . . .		16
17	Tax deposited with Form 7004	. . . . . . . .		17
18	Withholding (see instructions)	. . . . . . . .		18
19	Total payments. Add lines 16, 17, and 18	. . . . . . . .		19
20	Refundable credits from:
a	Form 2439		20a
b	Form 4136		20b
c	Reserved for future use		20c
d	Other (attach statement—see instructions)		20d
21	Total credits. Add lines 20a through 20d	. . . . . . . .		21
22	Reserved for future use	. . . . . . . .		22
23	Total payments and credits. Add lines 19 and 21. Enter here and on page 1, line 33 .	. . . . . . . .		23
						Form 1120 (2021)

Form 1120 (2021)

Page 4

Schedule K Other Information (see instructions)

Check accounting method: a

Cash

Accrual

Other (specify) ▶

2See the instructions and enter the: a Business activity code no. ▶

b Business activity ▶ c Product or service ▶

3 Is the corporation a subsidiary in an affiliated group or a parent–subsidiary controlled group? . . . . . . . . . .

If “Yes,” enter name and EIN of the parent corporation ▶

4At the end of the tax year:

aDid any foreign or domestic corporation, partnership (including any entity treated as a partnership), trust, or tax-exempt organization own directly 20% or more, or own, directly or indirectly, 50% or more of the total voting power of all classes of the

corporation’s stock entitled to vote? If “Yes,” complete Part I of Schedule G (Form 1120) (attach Schedule G) . . . . . .

bDid any individual or estate own directly 20% or more, or own, directly or indirectly, 50% or more of the total voting power of all

classes of the corporation’s stock entitled to vote? If “Yes,” complete Part II of Schedule G (Form 1120) (attach Schedule G) .

5At the end of the tax year, did the corporation:

aOwn directly 20% or more, or own, directly or indirectly, 50% or more of the total voting power of all classes of stock entitled to vote of any foreign or domestic corporation not included on Form 851, Affiliations Schedule? For rules of constructive ownership, see instructions. If “Yes,” complete (i) through (iv) below.

Yes No

(i)Name of Corporation

(ii)Employer

Identification Number

(if any)

(iii)Country of Incorporation

(iv)Percentage Owned in Voting

Stock

bOwn directly an interest of 20% or more, or own, directly or indirectly, an interest of 50% or more in any foreign or domestic partnership (including an entity treated as a partnership) or in the beneficial interest of a trust? For rules of constructive ownership, see instructions. If “Yes,” complete (i) through (iv) below.

(i)Name of Entity

(ii)Employer

Identification Number

(if any)

(iii)Country of Organization

(iv)Maximum

Percentage Owned in Profit, Loss, or Capital

6During this tax year, did the corporation pay dividends (other than stock dividends and distributions in exchange for stock) in

excess of the corporation’s current and accumulated earnings and profits? See sections 301 and 316 . . . . . . . .

If “Yes,” file Form 5452, Corporate Report of Nondividend Distributions. See the instructions for Form 5452. If this is a consolidated return, answer here for the parent corporation and on Form 851 for each subsidiary.

7At any time during the tax year, did one foreign person own, directly or indirectly, at least 25% of the total voting power of all classes of the corporation’s stock entitled to vote or at least 25% of the total value of all classes of the corporation’s stock? .

For rules of attribution, see section 318. If “Yes,” enter:

(a) Percentage owned ▶

and (b) Owner’s country ▶

(c)The corporation may have to file Form 5472, Information Return of a 25% Foreign-Owned U.S. Corporation or a Foreign Corporation Engaged in a U.S. Trade or Business. Enter the number of Forms 5472 attached ▶

8 Check this box if the corporation issued publicly offered debt instruments with original issue discount . . . . . . ▶ If checked, the corporation may have to file Form 8281, Information Return for Publicly Offered Original Issue Discount Instruments.

9Enter the amount of tax-exempt interest received or accrued during the tax year ▶ $

10Enter the number of shareholders at the end of the tax year (if 100 or fewer) ▶

11If the corporation has an NOL for the tax year and is electing to forego the carryback period, check here (see instructions) ▶

If the corporation is filing a consolidated return, the statement required by Regulations section 1.1502-21(b)(3) must be attached or the election will not be valid.

12Enter the available NOL carryover from prior tax years (do not reduce it by any deduction reported on

page 1, line 29a.) . . . . . . . . . . . . . . . . . . . . . . . . . ▶ $

Form 1120 (2021)

Page 5

Schedule K Other Information (continued from page 4)

13	Are the corporation’s total receipts (page 1, line 1a, plus lines 4 through 10) for the tax year and its total assets at the end of the	Yes No
13
	tax year less than $250,000?
	If “Yes,” the corporation is not required to complete Schedules L, M-1, and M-2. Instead, enter the total amount of cash
	distributions and the book value of property distributions (other than cash) made during the tax year ▶ $
14	Is the corporation required to file Schedule UTP (Form 1120), Uncertain Tax Position Statement? See instructions . . . .
	If “Yes,” complete and attach Schedule UTP.
15a	Did the corporation make any payments in 2021 that would require it to file Form(s) 1099?
b	If “Yes,” did or will the corporation file required Form(s) 1099?

16During this tax year, did the corporation have an 80%-or-more change in ownership, including a change due to redemption of its

own stock? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

17During or subsequent to this tax year, but before the filing of this return, did the corporation dispose of more than 65% (by value)

of its assets in a taxable, non-taxable, or tax deferred transaction? . . . . . . . . . . . . . . . . . .

18Did the corporation receive assets in a section 351 transfer in which any of the transferred assets had a fair market basis or fair

market value of more than $1 million? . . . . . . . . . . . . . . . . . . . . . . . . . . .

19During the corporation’s tax year, did the corporation make any payments that would require it to file Forms 1042 and 1042-S under chapter 3 (sections 1441 through 1464) or chapter 4 (sections 1471 through 1474) of the Code? . . . . . . . .

20 Is the corporation operating on a cooperative basis?. . . . . . . . . . . . . . . . . . . . . . .

21During the tax year, did the corporation pay or accrue any interest or royalty for which the deduction is not allowed under section

267A? See instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

If “Yes,” enter the total amount of the disallowed deductions ▶ $

22Does the corporation have gross receipts of at least $500 million in any of the 3 preceding tax years? (See sections 59A(e)(2)

and (3)) .

If “Yes,” complete and attach Form 8991.

23Did the corporation have an election under section 163(j) for any real property trade or business or any farming business in effect

	during the tax year? See instructions
24	Does the corporation satisfy one or more of the following? See instructions

aThe corporation owns a pass-through entity with current, or prior year carryover, excess business interest expense.

bThe corporation’s aggregate average annual gross receipts (determined under section 448(c)) for the 3 tax years preceding the current tax year are more than $26 million and the corporation has business interest expense.

cThe corporation is a tax shelter and the corporation has business interest expense. If “Yes,” complete and attach Form 8990.

25	Is the corporation attaching Form 8996 to certify as a Qualified Opportunity Fund?
	If “Yes,” enter amount from Form 8996, line 15 . . . . ▶ $

26Since December 22, 2017, did a foreign corporation directly or indirectly acquire substantially all of the properties held directly or indirectly by the corporation, and was the ownership percentage (by vote or value) for purposes of section 7874 greater than 50% (for example, the shareholders held more than 50% of the stock of the foreign corporation)? If “Yes,” list the ownership

percentage by vote and by value. See instructions . . . . . . . . . . . . . . . . . . . . . . .

Percentage: By Vote

By Value

Form 1120 (2021)

Form 1120 (2021)													Page 6
Schedule L		Balance Sheets per Books					Beginning of tax year				End of tax year
		Assets				(a)		(b)		(c)			(d)
1	Cash
2a	Trade notes and accounts receivable . . .
b	Less allowance for bad debts . .			. . .	(		)		(		)
3	Inventories
4	U.S. government obligations		. . . . .
5	Tax-exempt securities (see instructions) . .
6	Other current assets (attach statement) . .
7	Loans to shareholders
8	Mortgage and real estate loans
9	Other investments (attach statement) . . .
10a	Buildings and other depreciable assets . .
b	Less accumulated depreciation . .			. . .	(		)		(		)
11a	Depletable assets
b	Less accumulated depletion . . .			. . .	(		)		(		)
12	Land (net of any amortization)
13a	Intangible assets (amortizable only)			. . .
b	Less accumulated amortization . .			. . .	(		)		(		)
14	Other assets (attach statement)
15	Total assets
	Liabilities and Shareholders’ Equity
16	Accounts payable
17	Mortgages, notes, bonds payable in less than 1 year
18	Other current liabilities (attach statement) . .
19	Loans from shareholders
20	Mortgages, notes, bonds payable in 1 year or more
21	Other liabilities (attach statement) . . . .
22	Capital stock:	a Preferred stock . . . .
		b Common stock . . . .
23	Additional paid-in capital
24	Retained earnings—Appropriated (attach statement)
25	Retained earnings—Unappropriated . . .
26	Adjustments to shareholders’ equity (attach statement)
27	Less cost of treasury stock							(	)			(	)
28	Total liabilities and shareholders’ equity . .

Schedule M-1 Reconciliation of Income (Loss) per Books With Income per Return

Note: The corporation may be required to file Schedule M-3. See instructions.

1	Net income (loss) per books	7	Income recorded on books this year
2	Federal income tax per books		not included on this return (itemize):
3	Excess of capital losses over capital gains .		Tax-exempt interest $

4Income subject to tax not recorded on books this year (itemize):

		8		Deductions on this return not charged
5	Expenses recorded on books this year not			against book income this year (itemize):
	deducted on this return (itemize):		a	Depreciation . . $
a	Depreciation . . . . $		b	Charitable contributions $

bCharitable contributions . $

cTravel and entertainment . $

			9	Add lines 7 and 8
6	Add lines 1 through 5	10		Income (page 1, line 28)—line 6 less line 9

Schedule M-2 Analysis of Unappropriated Retained Earnings per Books (Schedule L, Line 25)

1	Balance at beginning of year	5			Distributions: a Cash
2	Net income (loss) per books				b Stock . . . .
3	Other increases (itemize):				c Property . . . .
			6		Other decreases (itemize):
				7	Add lines 5 and 6
4	Add lines 1, 2, and 3	8			Balance at end of year (line 4 less line 7)

Form 1120 (2021)

More About IRS 1120

What is the IRS Form 1120?

The IRS Form 1120 is a tax return used by corporations to report their income, gains, losses, deductions, and credits. It is essential for C corporations, which are separate legal entities from their owners. This form helps the IRS assess the corporation's tax liability based on its financial activities over the year.

Who is required to file Form 1120?

Any corporation operating in the United States must file Form 1120 if it is classified as a C corporation. This includes domestic corporations, even if they do not owe any taxes. Additionally, foreign corporations engaged in business in the U.S. may also need to file this form, depending on their income and activities.

What is the filing deadline for Form 1120?

Form 1120 is generally due on the 15th day of the fourth month after the end of the corporation's tax year. For most corporations that operate on a calendar year, this means the deadline is April 15. If the due date falls on a weekend or holiday, the deadline is extended to the next business day.

What information is needed to complete Form 1120?

To complete Form 1120, a corporation will need its financial statements, including income statements and balance sheets. Key information includes total income, cost of goods sold, deductions, and tax credits. Accurate records of business expenses, employee wages, and any other relevant financial data are also necessary for proper reporting.

Can Form 1120 be e-filed?

Yes, Form 1120 can be e-filed. The IRS encourages electronic filing as it is faster and more secure than traditional paper filing. Corporations can use approved software or a tax professional to submit their forms electronically. E-filing also allows for quicker processing and confirmation of receipt.

What are the consequences of not filing Form 1120?

Failure to file Form 1120 can lead to significant penalties. The IRS may impose a penalty for late filing, which can accumulate over time. Additionally, not filing can result in the corporation being unable to claim deductions or credits, leading to a higher tax liability. In severe cases, the IRS may take further actions, such as audits or legal proceedings.

Where can I find more information about Form 1120?

More information about Form 1120 can be found on the IRS website. The site offers detailed instructions, guidelines for completing the form, and resources for understanding corporate tax obligations. Additionally, tax professionals can provide personalized assistance and advice regarding specific situations related to Form 1120.

Key takeaways

Filling out the IRS Form 1120 is essential for corporations to report their income, gains, losses, deductions, and credits. Here are key takeaways to consider:

Understand the purpose: Form 1120 is used by corporations to report their income and calculate their federal income tax.
Know the filing deadline: The form is typically due on the 15th day of the fourth month after the end of the corporation's tax year.
Gather necessary information: Collect all financial records, including income statements, balance sheets, and expense documentation.
Identify the correct tax year: Ensure that you are reporting for the correct tax year, as it affects the calculations and deadlines.
Complete all sections: Fill out every applicable section of the form, including income, deductions, and tax credits.
Consider state requirements: Some states require additional forms or filings, so check local regulations.
Review for accuracy: Double-check all entries for accuracy to avoid penalties or delays in processing.
File electronically or by mail: Decide whether to file the form electronically or send it by mail, based on your preference and IRS guidelines.
Keep copies: Retain a copy of the filed form and all supporting documents for your records, as they may be needed for future reference.

Form Attributes

Fact Name	Description
Purpose	The IRS Form 1120 is used by corporations to report income, gains, losses, deductions, and credits, as well as to calculate their federal income tax liability.
Filing Deadline	Corporations must file Form 1120 by the 15th day of the fourth month after the end of their tax year. For calendar year corporations, this typically falls on April 15.
State-Specific Forms	Many states require separate corporate income tax returns. For example, California's form is 100, governed by the California Revenue and Taxation Code.
Penalties for Late Filing	If a corporation fails to file Form 1120 on time, it may incur penalties, which can be a percentage of the unpaid tax or a fixed amount per month, up to a certain limit.

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Dos and Don'ts

When filling out the IRS 1120 form, it’s important to get it right. Here are some things you should and shouldn't do:

Do double-check all your information for accuracy.
Don't forget to sign and date the form before submitting.
Do use the correct tax year when filling out the form.
Don't leave any fields blank; fill in all required information.
Do keep a copy of the form for your records.
Don't ignore the instructions provided by the IRS.
Do consult a tax professional if you're unsure about any part of the form.
Don't submit the form late to avoid penalties.