Table of Contents
If you are a U.S. citizen or resident alien, whether you must file a federal income tax return depends upon your gross income, your filing status, your age, and whether you are a dependent. For details, see Table 1 and Table 2. You also must file if one of the situations described in Table 3 applies. The filing requirements apply even if you owe no tax.
You may have to pay a penalty if you are required to file a return but fail to do so. If you willfully fail to file a return, you may be subject to criminal prosecution.
For information on what form to use — Form 1040EZ, Form 1040A, or Form 1040 — see the instructions in your tax package.

You must file a return if your gross income for the year was at least the amount shown on the appropriate line in Table 1. Dependents should see Table 2 instead.
You must file an income tax return for a decedent (a person who died) if both of the following are true.
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You are the surviving spouse, executor, administrator, or legal representative.
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The decedent met the filing requirements described in this publication at the time of his or her death.
For more information, see Final Return for Decedent in Publication 559.
Table 2. 2007 Filing Requirements for Dependents
See Exemptions for Dependents to find out if you are a dependent.
| If your parent (or someone else) can claim you as a dependent, use this table to see if you must file a return. | |
| In this table, unearned income includes taxable interest, ordinary dividends, and capital gain distributions. Earned income includes wages, tips, and taxable scholarship and fellowship grants. Gross income is the total of your unearned and earned income. | |
| Caution. If your gross income was $3,400 or more, you usually cannot be claimed as a dependent unless you are a qualifying child. For details, see Exemptions for Dependents. | |
| Single dependents— Were you either age 65 or older or blind? | |
| □ | No. You must file a return if any of the following apply.
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| □ | Yes. You must file a return if any of the following apply.
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| Married dependents—Were you either age 65 or older or blind? | |
| □ | No. You must file a return if any of the following apply.
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| □ | Yes. You must file a return if any of the following apply.
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For purposes of determining whether you must file a return, you must include in your gross income all of the income you earned or received abroad, including any income you can exclude under the foreign earned income exclusion. For more information on special tax rules that may apply to you, see Publication 54, Tax Guide for U.S. Citizens and Resident Aliens Abroad.
Generally, if you are a U.S. citizen and a bona fide resident of Puerto Rico, you must file a U.S. income tax return if you meet the income requirements. This is in addition to any legal requirement you may have to file an income tax return with Puerto Rico.
If you are a bona fide resident of Puerto Rico for the whole year, your U.S. gross income does not include income from sources within Puerto Rico. However, include in your U.S. gross income any income you received for your services as an employee of the United States or any U.S. agency. If you receive income from Puerto Rican sources that is not subject to U.S. tax, you must reduce your standard deduction, which reduces the amount of income you can have before you must file a U.S. income tax return.
For more information, see Publication 570, Tax Guide for Individuals With Income From U.S. Possessions.
If you had income from Guam, the Commonwealth of Northern Mariana Islands, American Samoa, or the U.S. Virgin Islands, special rules may apply when determining whether you must file a U.S. federal income tax return. In addition, you may have to file a return with the individual possession government. See Publication 570 for more information.
A person who is a dependent may still have to file a return. This depends on the amount of the dependent's earned income, unearned income, and gross income. For details, see Table 2. A dependent may also have to file if one of the situations described in Table 3 applies.
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Your child was under age 18 at the end of 2007. (A child born on January 1, 1990, is considered to be age 18 at the end of 2007; you cannot make the election for this child.)
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Your child had gross income only from interest and dividends (including capital gain distributions and Alaska Permanent Fund dividends).
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The interest and dividend income was less than $8,500.
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Your child is required to file a return for 2007 unless you make this election.
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Your child does not file a joint return for 2007.
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No estimated tax payment was made for 2007 and no 2006 overpayment was applied to 2007 under your child's name and social security number.
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No federal income tax was withheld from your child's income under the backup withholding rules.
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You are the parent whose return must be used when making the election to report your child's unearned income.
You may have to file a tax return even if your gross income is less than the amount shown in Table 1 or Table 2 for your filing status. See Table 3 for those other situations when you must file.
Table 3. Other Situations When You Must File a 2007 Return
| If any of the four conditions listed below applied to you for 2007, you must file a return. | ||
| 1. | You owe any special taxes, including any of the following. | |
| a. | Alternative minimum tax. (See the Form 1040 instructions for line 45.) | |
| b. | Additional tax on a qualified plan, including an individual retirement arrangement (IRA), or other tax-favored account. (See Publication 590, Individual Retirement Arrangements (IRAs), and Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans.) But if you are filing a return only because you owe this tax, you can file Form 5329 by itself. | |
| c. | Social security or Medicare tax on tips you did not report to your employer (see Publication 531, Reporting Tip Income) or on wages you received from an employer who did not withhold these taxes (see Form 8919). | |
| d. | Write-in taxes, including uncollected social security, Medicare, or railroad retirement tax on tips you reported to your employer or on group-term life insurance and additional tax on health savings account distributions. (See Publication 531, Publication 969, and the Form 1040 instructions for line 63.) | |
| e. | Household employment taxes. But if you are filing a return only because you owe these taxes, you can file Schedule H by itself. | |
| f. | Recapture taxes. (See the Form 1040 instructions for lines 44 and 63.) | |
| g. | Additional tax on a health savings account from From 8889, Part III. | |
| 2. | You received any advance earned income credit (EIC) payments from your employer. These payments should be shown in box 9 of your Form W-2. (See Publication 596, Earned Income Credit.) | |
| 3. | You had net earnings from self-employment of at least $400. (See Schedule SE (Form 1040) and its instructions.) | |
| 4. | You had wages of $108.28 or more from a church or qualified church-controlled organization that is exempt from employer social security and Medicare taxes. (See Schedule SE (Form 1040) and its instructions.) | |
Even if you do not have to file, you should file a tax return if you can get money back. For example, you should file if one of the following applies.
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You had income tax withheld from your pay.
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You made estimated tax payments for the year or had any of your overpayment for last year applied to this year's estimated tax.
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You qualify for the earned income credit. See Publication 596, Earned Income Credit (EIC), for more information.
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You qualify for the additional child tax credit. See the instructions in your tax forms package for more information on this credit.
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You qualify for the health coverage tax credit. For information about this credit, see Form 8885, Health Coverage Tax Credit.
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You qualify for the refundable credit for prior year minimum tax. See Form 8801, Credit for Prior Year Minimum Tax — Individuals, Estates, and Trusts.
You must determine your filing status before you can determine your filing requirements, standard deduction (discussed later), and correct tax. You figure your correct tax by using the section of the Tax Computation Worksheet or the column in the Tax Table that applies to your filing status.
You also use your filing status in determining whether you are eligible to claim certain other deductions and credits.
There are five filing statuses:
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Single,
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Married Filing Jointly,
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Married Filing Separately,
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Head of Household, and
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Qualifying Widow(er) With Dependent Child.
If more than one filing status applies to you, choose the one that will give you the lowest tax.
In general, your filing status depends on whether you are considered unmarried or married. For federal tax purposes, a marriage means only a legal union between a man and a woman as husband and wife.
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You are married and living together as husband and wife.
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You are living together in a common law marriage that is recognized in the state where you now live or in the state where the common law marriage began.
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You are married and living apart, but not legally separated under a decree of divorce or separate maintenance.
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You are separated under an interlocutory (not final) decree of divorce. For purposes of filing a joint return, you are not considered divorced.
Your filing status is single if, on the last day of the year, you are unmarried or legally separated from your spouse under a divorce or separate maintenance decree, and you do not qualify for another filing status. To determine your marital status on the last day of the year, see Marital Status, earlier.
You can choose married filing jointly as your filing status if you are married and both you and your spouse agree to file a joint return. On a joint return, you report your combined income and deduct your combined allowable expenses. You can file a joint return even if one of you had no income or deductions.
If you and your spouse decide to file a joint return, your tax may be lower than your combined tax for the other filing statuses. Also, your standard deduction (if you do not itemize deductions) may be higher, and you may qualify for tax benefits that do not apply to other filing statuses.

Both you and your spouse must include all of your income, exemptions, and deductions on your joint return.
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Innocent spouse relief.
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Separation of liability, which applies to joint filers who are divorced, widowed, legally separated, or who have not lived together for the 12 months ending on the date election of this relief is filed.
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Equitable relief.
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Relief from liability arising from community property law.
You can choose married filing separately as your filing status if you are married. This filing status may benefit you if you want to be responsible only for your own tax or if it results in less tax than filing a joint return.
If you and your spouse do not agree to file a joint return, you have to use this filing status unless you qualify for head of household status, discussed next.
You may be able to choose head of household filing status if you live apart from your spouse, meet certain tests, and are considered unmarried (explained later, under Head of Household). This can apply to you even if you are not divorced or legally separated. If you qualify to file as head of household, instead of as married filing separately, your tax may be lower, you may be able to claim the earned income credit and certain other credits, and your standard deduction will be higher. The head of household filing status allows you to choose the standard deduction even if your spouse chooses to itemize deductions. See Head of Household, later, for more information.

If you choose married filing separately as your filing status, the following special rules apply. Because of these special rules, you will usually pay more tax on a separate return than if you used another filing status that you qualify for.
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Your tax rate generally will be higher than it would be on a joint return.
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Your exemption amount for figuring the alternative minimum tax will be half that allowed to a joint return filer.
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You cannot take the credit for child and dependent care expenses in most cases, and the amount that you can exclude from income under an employer's dependent care assistance program is limited to $2,500 (instead of $5,000 if you filed a joint return).
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You cannot take the earned income credit.
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You cannot take the exclusion or credit for adoption expenses in most cases.
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You cannot take the education credits (the Hope credit and the lifetime learning credit), the deduction for student loan interest, or the tuition and fees deduction.
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You cannot exclude any interest income from qualified U.S. savings bonds that you used for higher education expenses.
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If you lived with your spouse at any time during the tax year:
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You cannot claim the credit for the elderly or the disabled.
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You will have to include in income more (up to 85%) of any social security or equivalent railroad retirement benefits you received, and
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You cannot roll over amounts from a traditional IRA into a Roth IRA.
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The following credits and deductions are reduced at income levels that are half of those for a joint return:
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The child tax credit,
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The retirement savings contributions credit,
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Itemized deductions, and
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The deduction for personal exemptions.
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Your capital loss deduction limit is $1,500 (instead of $3,000 if you filed a joint return).
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If your spouse itemizes deductions, you cannot claim the standard deduction. If you can claim the standard deduction, your basic standard deduction is half the amount allowed on a joint return.
You can change your filing status by filing an amended return using Form 1040X.
If you or your spouse (or both of you) file a separate return, you generally can change to a joint return any time within 3 years from the due date of the separate return or returns. This does not include any extensions. A separate return includes a return filed by you or your spouse claiming married filing separately, single, or head of household filing status.
Once you file a joint return, you cannot choose to file separate returns for that year after the due date of the return.
You may be able to file as head of household if you meet all the following requirements.
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You are unmarried or “considered unmarried” on the last day of the year.
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You paid more than half the cost of keeping up a home for the year.
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A “qualifying person” lived with you in the home for more than half the year (except for temporary absences, such as school). However, if the “qualifying person” is your dependent parent, he or she does not have to live with you. See Special rule for parent, later, under Qualifying Person.

To qualify for head of household status, you must be either unmarried or considered unmarried on the last day of the year. You are considered unmarried on the last day of the tax year if you meet all the following tests.
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You file a separate return (defined earlier under Joint Return After Separate Returns).
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You paid more than half the cost of keeping up your home for the tax year.
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Your spouse did not live in your home during the last 6 months of the tax year. Your spouse is considered to live in your home even if he or she is temporarily absent due to special circumstances. See Temporary absences, later.
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Your home was the main home of your child, stepchild, or foster child for more than half the year. (See Home of qualifying person, later, for rules applying to a child's birth, death, or temporary absence during the year.)
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You must be able to claim an exemption for the child. However, you meet this test if you cannot claim the exemption only because the noncustodial parent can claim the child using the rules described later in Children of divorced or separated parents under Qualifying Child or in Support Test for Children of Divorced or Separated Parents under Qualifying Relative. The general rules for claiming an exemption for a dependent are explained later under Exemptions for Dependents.

To qualify for head of household status, you must pay more than half of the cost of keeping up a home for the year. You can determine whether you paid more than half of the cost of keeping up a home by using the following worksheet.
Cost of Keeping Up a Home
| Amount
You Paid |
Total Cost |
|
| Property taxes | $ | $ |
| Mortgage interest expense | ||
| Rent | ||
| Utility charges | ||
| Upkeep and repairs | ||
| Property insurance | ||
|
Food consumed
on the premises |
||
| Other household expenses | ||
| Totals | $ | $ |
| Minus total amount you paid | ( ) | |
| Amount others paid | $ | |
| If the total amount you paid is more than the amount others paid, you meet the requirement of paying more than half the cost of keeping up the home. | ||







