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IRS.gov Website
Publication 505
taxmap/pubs/p505-016.htm#en_us_publink1000194757

Chapter 3
Credit for Withholding and Estimated Tax for 2017(p44)

For Use in Calendar Year 2017

taxmap/pubs/p505-016.htm#en_us_publink1000194760Introduction

When you file your 2017 income tax return, take credit for all the income tax and excess social security or railroad retirement tax withheld from your salary, wages, pensions, etc. Also take credit for the estimated tax you paid for 2017. These credits are subtracted from your total tax. Because these credits are refundable, you should file a return and claim these credits, even if you don’t owe tax.
If the total of your withholding and your estimated tax payments for any payment period is less than the amount you needed to pay by the due date for that period, you may be charged a penalty, even if the total of these credits is more than your tax for the year.
taxmap/pubs/p505-016.htm#en_us_publink1000194761

Withholding(p44)

For Use in Calendar Year 2017
rule
If you had income tax withheld during 2017, you generally should be sent a statement by January 31, 2018, showing your income and the tax withheld. Depending on the source of your income, you will receive:
taxmap/pubs/p505-016.htm#en_us_publink1000194762

Form W-2(p44)

For Use in Calendar Year 2017
rule
Your employer is required to provide or send Form W-2 to you no later than January 31, 2018. You should receive a separate Form W-2 from each employer you worked for.
If you stopped working before the end of 2017, your employer could have given you your Form W-2 at any time after you stopped working. However, your employer must provide or send it to you by January 31, 2018.
If you ask for the form, your employer must send it to you within 30 days after receiving your written request or within 30 days after your final wage payment, whichever is later.
If you haven’t received your Form W-2 by January 31, contact your employer or payer to request a copy. If you still don’t get the form by the end of February, use Tax Topic 154 to find out what to do.
Form W-2 shows your total pay and other compensation and the income tax, social security tax, and Medicare tax that was withheld during the year. Total the federal income tax withheld (shown in box 2 of all Forms W-2 received) and enter that amount on the appropriate line of your tax return.
In addition, Form W-2 is used to report any taxable sick pay you received and any income tax withheld from your sick pay. Your sick pay may be combined with other wages in one Form W-2 or you may receive a separate Form W-2 for sick pay.
If you file a paper tax return, attach Copy B of Form W-2 to your return.
taxmap/pubs/p505-016.htm#en_us_publink1000194764

Form W-2G(p44)

For Use in Calendar Year 2017
rule
If you had gambling winnings in 2017, the payer may have withheld income tax. If tax was withheld, the payer will give you a Form W-2G showing the amount you won and the amount of tax withheld.
Report the amounts you won on line 21 of Form 1040. Take credit for the tax withheld on line 64 of Form 1040. If you had gambling winnings, you must use Form 1040; you can’t use Form 1040A or Form 1040EZ.
Gambling losses can be deducted on Schedule A (Form 1040) as a miscellaneous itemized deduction. However, you can’t deduct more than the gambling winnings you report on Form 1040.
File Form W-2G with your income tax return only if it shows any federal income tax withheld in box 4.
taxmap/pubs/p505-016.htm#en_us_publink1000194765

The 1099 Series(p44)

For Use in Calendar Year 2017
rule
Most forms in the 1099 series are not filed with your return. In general, these forms should be furnished to you by January 31, 2018. Unless instructed to file any of these forms with your return, keep them for your records.
There are several different forms in this series, including:
If you received the types of income reported on some forms in the 1099 series, you may not be able to use Form 1040A or Form 1040EZ. See the instructions for these forms for details.
taxmap/pubs/p505-016.htm#en_us_publink1000194766

Reporting your withholding.(p44)

For Use in Calendar Year 2017
rule
Report on your tax return all federal income tax withholding shown on your Form 1099, Form SSA-1099, and/or Form RRB-1099. Include the amount withheld in the total on line 64 of Form 1040, line 40 of Form 1040A, or line 7 of Form 1040EZ.
taxmap/pubs/p505-016.htm#en_us_publink1000194767
Form 1099-R.(p44)
Attach Form 1099-R to your paper return if federal income tax withholding is shown in box 4. Don’t attach any other Form 1099.
taxmap/pubs/p505-016.htm#en_us_publink1000194768

Form Not Correct(p44)

For Use in Calendar Year 2017
rule
If you receive a form with incorrect information, you should ask the payer for a corrected form. Call the telephone number or write to the address given for the payer on the form. The corrected Form W-2G or Form 1099 you receive will have an "X" in the "CORRECTED" box at the top of the form. A special form, Form W-2c, Corrected Wage and Tax Statement, is used to correct a Form W-2.
In certain situations, you will receive two forms in place of the original incorrect form. This will happen when your taxpayer identification number is wrong or missing, your name and address are wrong, or you received the wrong type of form (for example, a Form 1099-DIV instead of a Form 1099-INT). One new form you receive will be the same incorrect form or have the same incorrect information, but all money amounts will be zero. This form will have an "X" in the "CORRECTED" box at the top of the form. The second new form should have all the correct information, prepared as though it is the original (the "CORRECTED" box won’t be checked).
taxmap/pubs/p505-016.htm#en_us_publink1000194769

Form Received After Filing(p44)

For Use in Calendar Year 2017
rule
If you file your return and you later receive a form for income that you didn’t include on your return, report the income and take credit for any income tax withheld by filing Form 1040X, Amended U.S. Individual Income Tax Return.
taxmap/pubs/p505-016.htm#en_us_publink1000194770

Separate Returns(p44)

For Use in Calendar Year 2017
rule
If you are married but file a separate return, you can take credit only for the tax withheld from your own income. Don’t include any amount withheld from your spouse's income. However, different rules may apply if you live in a community property state.
taxmap/pubs/p505-016.htm#en_us_publink1000194771

Community property states.(p45)

For Use in Calendar Year 2017
rule
Community property states include the following. Generally, if you live in a community property state and file a separate return, you and your spouse each must report half of all community income in addition to your own separate income. If you are required to report half of all community income, you are entitled to take credit for half of all taxes withheld on the community income. If you were divorced during the year, each of you generally must report half the community income and can take credit for half the withholding on that community income for the period before the divorce.
For more information on these rules, and some exceptions, see Pub. 555, Community Property.
taxmap/pubs/p505-016.htm#en_us_publink1000194772

Fiscal Years (FYs)(p45)

For Use in Calendar Year 2017
rule
If you file your tax return on the basis of a fiscal year (a 12-month period ending on the last day of any month except December), you must follow special rules, described next, to determine your credit for federal income tax withholding.
taxmap/pubs/p505-016.htm#en_us_publink1000194773

Fiscal year withholding.(p45)

For Use in Calendar Year 2017
rule
You can claim credit on your tax return only for the tax withheld during the calendar year (CY) ending within your fiscal year. You can’t claim credit for any of the tax withheld during the calendar year beginning in your fiscal year. You will be able to claim credit for that withholding on your return for your next fiscal year.
The Form W-2 or 1099 you receive for the calendar year that ends during your fiscal year will show the tax withheld and the income you received during that calendar year.
Although you take credit for all the withheld tax shown on the form, report only the part of the income shown on the form that you received during your fiscal year. Add to that the income you received during the rest of your fiscal year.
taxmap/pubs/p505-016.htm#en_us_publink1000194774

Example.(p45)

Miles Hanson files his return for a fiscal year ending June 30, 2017. In January 2017, he received a Form W-2 that showed that his wages for 2016 were $31,200 and that his income tax withheld was $3,328. His records show that he had received $15,000 of the wages by June 30, 2016, and $16,200 from July 1 through December 31, 2016. See Table 3-1.
On his return for the fiscal year ending June 30, 2017, Miles will report the $16,200 he was paid in July through December of 2016, plus the $18,850 he was paid during the rest of the fiscal year, January 1, 2017, through June 30, 2017. However, he takes credit for all $3,328 that was withheld during 2016.
On his return for the fiscal year ending June 30, 2016, he reported the $15,000 he was paid in January through June 2016, but took no credit for the tax withheld during that time. On his return for the fiscal year ending June 30, 2018, he will take the credit for any tax withheld during 2017 but not for any tax withheld during 2018.
taxmap/pubs/p505-016.htm#en_us_publink1000194775

Table 3-1. Example for Fiscal Year Ending June 30, 2017—Miles Hanson

Date Form W-2 Miles' records Tax return for FY ending 6/30/20161 Tax return for FY ending 6/30/2017
Wages With-
holding
Wages With-
holding
Wages With-
holding
Wages With-
holding
CY 20162 $31,200$3,328      
1/1/2016–
6/30/2016
  $15,000$1,601$15,000   
7/1/2016–
12/31/2016
  $16,200$1,727  $16,200$3,328
CY 2017 $37,700$4,3163      
1/1/2017–
6/30/2017
  $18,850$2,158  $18,850 
7/1/2017–
12/31/2017
  $18,8504$2,158    
1  Miles' tax return for FY ending 6/30/2016 also included his wages for 7/1–12/31/2015 and the withholding shown on his 2015 Form W-2.
2
 Calendar year (January 1–December 31).
3 Withholding shown on 2017 Form W-2 ($4,316) will be included in Miles' tax return for FY ending 6/30/2018, the fiscal year in which calendar year 2017 ends.
4 Wages for 7/1–12/31/2017 ($18,850) will be included in Miles' tax return for FY ending 6/30/2018, the fiscal year in which the wages were received.
taxmap/pubs/p505-016.htm#en_us_publink1000194776

Backup withholding.(p45)

For Use in Calendar Year 2017
rule
If income tax has been withheld under the backup withholding rule, take credit for it on your tax return for the fiscal year in which you received the income.
taxmap/pubs/p505-016.htm#en_us_publink1000194777

Example.(p45)

Emily Smith's records show that she received income in November 2017 and February 2018 from which there was backup withholding ($100 and $50, respectively). Emily takes credit for the entire $150 of backup withholding on her tax return for the fiscal year ending September 30, 2018.