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IRS.gov Website
Publication 505
taxmap/pubs/p505-012.htm#en_us_publink1000194588

How To Figure
Estimated Tax(p26)

rule
To figure your estimated tax, you must figure your expected AGI, taxable income, taxes, deductions, and credits for the year.
When figuring your 2013 estimated tax, it may be helpful to use your income, deductions, and credits for 2012 as a starting point. Use your 2012 federal tax return as a guide. You can use Form 1040-ES to figure your estimated tax. Nonresident aliens use Form 1040-ES (NR) to figure estimated tax.
You must make adjustments both for changes in your own situation and for recent changes in the tax law. For 2013, there are several changes in the law. Some of these changes are discussed under What's New for 2013, earlier. For information about these and other changes in the law, visit the IRS website at IRS.gov.
The instructions for Form 1040-ES include a worksheet to help you figure your estimated tax. Keep the worksheet for your records.
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2013 Estimated Tax Worksheet(p26)

rule
Use Worksheet 2-1 to help guide you through the information about completing the 2013 Estimated Tax Worksheet. You can find a blank copy of the worksheet in the Instructions for Form 1040-ES.
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Expected AGI—Line 1(p26)

rule
Your expected AGI for 2013 (line 1) is your expected total income minus your expected adjustments to income.
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Total income.(p26)

rule
Include in your total income all the income you expect to receive during the year, even income that is subject to withholding. However, do not include income that is tax exempt.
Total income includes all income and loss for 2013 that, if you had received it in 2012, would have been included on your 2012 tax return in the total on line 22 of Form 1040, line 15 of Form 1040A, or line 4 of Form 1040EZ.
Pencil
Social security and railroad retirement benefits. If you expect to receive social security or tier 1 railroad retirement benefits during 2013, use Worksheet 2-2 to figure the amount of expected taxable benefits you should include on line 1.
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Adjustments to income.(p26)

rule
Be sure to subtract from your expected total income all of the adjustments you expect to take on your 2013 tax return.
Pencil
Self-employed. If you expect to have income from self-employment, use Worksheet 2-3 to figure your expected self-employment tax and your allowable deduction for self-employment tax. Include the amount from line 11 of Worksheet 2-3 in your expected adjustments to income. If you file a joint return and both you and your spouse have net earnings from self-employment, each of you must complete a separate worksheet.
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Expected Taxable Income—
Lines 2–5(p26)

rule
Reduce your expected AGI for 2013 (line 1) by either your expected itemized deductions or your standard deduction and by your exemptions (lines 2 through 5).
taxmap/pubs/p505-012.htm#en_us_publink1000194602

Itemized deductions—line 2.(p26)

rule
If you expect to claim itemized deductions on your 2013 tax return, enter the estimated amount on line 2.
Itemized deductions are the deductions that can be claimed on Schedule A (Form 1040).
EIC
For 2013, your total itemized deductions may be reduced if your AGI is more than the amount shown next for your filing status.
Single$250,000
Married filing jointly or qualifying widow(er)$300,000
Married filing separately$150,000
Head of household$275,000
If you expect your AGI to be more than this amount, use Worksheet 2-5 to figure the amount to enter on line 2.
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Standard deduction—line 2.(p26)

rule
If you expect to claim the standard deduction on your 2013 tax return, enter the amount on line 2. Use Worksheet 2-4 to figure your standard deduction.
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No standard deduction.(p26)
The standard deduction for some individuals is zero. Your standard deduction will be zero if you:
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Exemptions—line 4.(p26)

rule
After you have subtracted either your expected itemized deductions or your standard deduction from your expected AGI, reduce the amount remaining by $3,900 for each exemption you expect to take on your 2013 tax return. If another person (such as your parent) can claim an exemption for you on his or her tax return, you cannot claim your own personal exemption. This is true even if the other person will not claim your exemption or the exemption will be reduced or eliminated under the phaseout rule.
EIC
For 2013, your deduction for personal exemption is reduced if your AGI is more than the amount shown next for your filing status.
Single$250,000
Married filing jointly or qualifying widow(er)$300,000
Married filing separately$150,000
Head of household$275,000
If you expect your AGI to be more than this amount, use Worksheet 2-6 to figure the amount to enter on line 4.
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Expected Taxes and Credits—Lines 6–13c(p26)

rule
After you have figured your expected taxable income (line 5), follow the steps below to figure your expected taxes, credits, and total tax for 2013. Most people will have entries for only a few of these steps. However, you should check every step to be sure you do not overlook anything.
taxmap/pubs/p505-012.htm#en_us_publink1000194610

Step 1.(p27)

rule
Figure your expected income tax (line 6). Generally, you will use the 2013 Tax Rate Schedules, later, or in the instructions to Form 1040-ES, to figure your expected income tax.
However, see below for situations where you must use a different method to compute your estimated tax.
taxmap/pubs/p505-012.htm#en_us_publink1000194612
Tax on child's investment income.(p27)
You must use a special method to figure tax on the income of the following children who have more than $2,000 of investment income.
  1. Children under age 18 at the end of 2013.
  2. The following children if their earned income is not more than half their support.
    1. Children age 18 at the end of 2013.
    2. Children who are full-time students over age 18 and under age 24 at the end of 2013.
See Publication 929, Tax Rules for Children and Dependents. Although the ages and dollar amounts in the publication may be different in the 2013 revision, this reference will give you basic information for figuring the tax.
taxmap/pubs/p505-012.htm#en_us_publink1000194613
Tax on net capital gain.(p27)
The regular income tax rates for individuals do not apply to a net capital gain. Instead, your net capital gain is taxed at a lower maximum rate.
The term "net capital gain" means the amount by which your net long-term capital gain for the year is more than your net short-term capital loss.
Pencil
Tax on capital gain and qualified dividends. If the amount on line 1 includes a net capital gain or qualified dividends, use Worksheet 2-7 to figure your tax.
Note.For 2013, your capital gains and dividends rate will depend on your income.
Pencil
Tax if excluding foreign earned income or excluding or deducting foreign housing. If you expect to claim the foreign earned income exclusion or the housing exclusion or deduction on Form 2555 or Form 2555-EZ, use Worksheet 2-8 to figure your estimated tax.
taxmap/pubs/p505-012.htm#en_us_publink1000194619

Step 2.(p27)

rule
Total your expected taxes (line 8). Include on line 8 the sum of the following.
  1. Your tax on line 6.
  2. Your expected alternative minimum tax (AMT) on line 7 from Form 6251, line 35, or included on Form 1040A, line 28.
  3. Your expected additional taxes from Form 8814, Parents' Election To Report Child's Interest and Dividends, and Form 4972, Tax on Lump-Sum Distributions.
  4. Any recapture of education credits.
taxmap/pubs/p505-012.htm#en_us_publink1000194620

Step 3.(p27)

rule
Subtract your expected credits (line 9). If you are using your 2012 return as a guide and filed Form 1040, your total credits for 2012 were shown on line 54. If you filed Form 1040A, your total credits for 2012 were on line 34.
If your credits on line 9 are more than your taxes on line 8, enter "-0-" on line 10 and go to Step 4.
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Step 4.(p27)

rule
Add your expected self-employment tax (line 11). You already should have figured your self-employment tax (see Self-employed under Expected AGI—Line 1 earlier).
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Step 5.(p27)

rule
Add your expected other taxes (line 12).
Other taxes include the following.
  1. Additional tax on early distributions from:
    1. An IRA or other qualified retirement plan,
    2. A tax-sheltered annuity, or
    3. A modified endowment contract entered into after June 20, 1988.
  2. Household employment taxes if:
    1. You will have federal income tax withheld from wages, pensions, annuities, gambling winnings, or other income, or
    2. You would be required to make estimated tax payments even if you did not include household employment taxes when figuring your estimated tax.
  3. Amounts written on Form 1040 on the line for "other taxes" (line 60 on the 2012 Form 1040). But, do not include recapture of a federal mortgage subsidy; tax on excess golden parachute payments; look-back interest due under section 167(g) or 460(b) of the Internal Revenue Code; excise tax on insider stock compensation from an expatriated corporation; uncollected social security and Medicare tax or RRTA tax on tips or group-term life insurance; or additional tax on advance payments of health coverage tax credit when not eligible.
  4. Repayment of the first-time homebuyer credit. See Form 5405.
  5. Additional Medicare Tax. A 0.9% Additional Medicare Tax applies to your combined Medicare wages and self-employment income and/or your RRTA compensation that exceeds the amount listed in the following chart, based on your filing status.
    Filing Status Threshold Amount
    Married filing jointly$250,000
    Married filing separately$125,000
    Single$200,000
    Head of household$200,000
    Qualifying Widow(er)$200,000

    Medicare wages and self-employment income are combined to determine if your income exceeds the threshold. A self-employment loss should not be considered for purposes of this tax. RRTA compensation should be separately compared to the threshold. Your employer is responsible for withholding the 0.9% Additional Medicare Tax on Medicare wages or RRTA compensation it pays to you in excess of $200,000 in 2013. You should consider this withholding, if applicable, in determining whether you need to make an estimated payment.
  6. Net Investment Income Tax (NIIT). The NIIT is 3.8% of the lesser of your net investment income or the excess of your modified adjusted gross income over the amount listed in the following chart, based on your filing status.
    Filing Status Threshold Amount
    Married filing jointly$250,000
    Married filing separately$125,000
    Single$200,000
    Head of household$200,000
    Qualifying Widow(er)$250,000

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Step 6.(p27)

rule
Subtract your refundable credit (line 13b).
To figure your expected fuel tax credit, do not include fuel tax for the first three quarters of the year that you expect to have refunded to you.
The result of steps 1 through 6 is your total estimated tax for 2013 (line 13c).
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Required Annual Payment—
Line 14c(p27)

rule
On lines 14a through 14c, figure the total amount you must pay for 2013, through withholding and estimated tax payments, to avoid paying a penalty.
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General rule.(p27)

rule
The total amount you must pay is the smaller of:
  1. 90% of your total expected tax for 2013, or
  2. 100% of the total tax shown on your 2012 return. Your 2012 tax return must cover all 12 months.
taxmap/pubs/p505-012.htm#en_us_publink1000194627

Special rules.(p27)

rule
There are special rules for higher income taxpayers and for farmers and fishermen.
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Higher income taxpayers.(p27)
If your AGI for 2012 was more than $150,000 ($75,000 if your filing status for 2013 is married filing separately), substitute 110% for 100% in (2) above. This rule does not apply to farmers and fishermen.
For 2012, AGI is the amount shown on Form 1040, line 37; Form 1040A, line 21; and Form 1040EZ, line 4.
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Example.(p27)
Jeremy Martin's total tax on his 2012 return was $42,581, and his expected tax for 2013 is $71,253. His 2012 AGI was $180,000. Because Jeremy had more than $150,000 of AGI in 2012, he figures his required annual payment as follows. He determines that 90% of his expected tax for 2013 is $64,128 (.90 × $71,253). Next, he determines that 110% of the tax shown on his 2012 return is $46,839 (1.10 x $42,581). Finally, he determines that his required annual payment is $46,839, the smaller of the two.
taxmap/pubs/p505-012.htm#en_us_publink1000194630
Farmers and fishermen.(p28)
If at least two-thirds of your gross income for 2012 or 2013 is from farming or fishing, your required annual payment is the smaller of:
  1. 662/3% (.6667) of your total tax for 2013, or
  2. 100% of the total tax shown on your 2012 return. (Your 2012 tax return must cover all 12 months.)
For definitions of "gross income from farming" and "gross income from fishing," see Farmers and Fishermen, under Special Rules discussed earlier.
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Total tax for 2012—line 14b.(p28)

rule
Your 2012 total tax, if you filed Form 1040, is the amount on line 61 reduced by the following.
  1. Unreported social security and Medicare tax or RRTA tax from Forms 4137 or 8919 (line 57).
  2. The following amounts from Form 5329 included on line 58.
    1. Any tax on excess contributions to IRAs, Archer MSAs, Coverdell education savings accounts, and health savings accounts.
    2. Any tax on excess accumulations in qualified retirement plans.
  3. The following write-ins on line 60.
    1. Excise tax on excess golden parachute payments (identified as "EPP").
    2. Excise tax on insider stock compensation from an expatriated corporation (identified as "ISC").
    3. Look-back interest due under section 167(g) (identified as "From Form 8866").
    4. Look-back interest due under section 460(b) (identified as "From Form 8697").
    5. Recapture of federal mortgage subsidy (identified as "FMSR").
    6. Additional tax on advance payments of health coverage tax credit when not eligible (identified as "HCTC").
    7. Uncollected social security and Medicare tax or RRTA tax on tips or group-term life insurance (identified as "UT").
  4. Any refundable credit amounts.
If you filed Form 1040A, your 2012 total tax is the amount on line 35 reduced by any refundable credits.
If you filed Form 1040EZ, your 2012 total tax is the amount on line 10 reduced by the amount on line 8a.
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Total Estimated Tax Payments Needed—Line 16a(p28)

rule
Use lines 15 and 16a to figure the total estimated tax you may be required to pay for 2013. Subtract your expected withholding from your required annual payment (line 14c). You usually must pay this difference in four equal installments. See When To Pay Estimated Tax and How To Figure Each Payment .
You do not have to pay estimated tax if:
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Withholding—line 15.(p28)

rule
Your expected withholding for 2013 (line 15) includes the income tax you expect to be withheld from all sources (wages, pensions and annuities, etc.). It also includes excess social security and railroad retirement tax you expect to be withheld from your wages as well as Additional Medicare Tax.
For this purpose, you will have excess social security or tier 1 railroad retirement tax withholding for 2013 only if your wages from two or more employers are more than $113,700. See Excess Social Security or Railroad Retirement Tax Withholding in chapter 3.