Publication 504
taxmap/pubs/p504-007.htm#en_us_publink1000176083When you become divorced or separated, you will usually have
to file a new Form W-4, Employee's Withholding Allowance Certificate, with your
employer to claim your proper withholding allowances. If you receive alimony,
you may have to make estimated tax payments.
 | If you do not pay enough tax either through withholding or
by making estimated tax payments, you will have an underpayment of estimated tax
and you may have to pay a penalty. If you do not pay enough tax by the due date
of each payment, you may have to pay a penalty even if you are due a refund when
you file your tax return.
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For more information, see Publication 505, Tax Withholding and
Estimated Tax.
taxmap/pubs/p504-007.htm#en_us_publink1000176085If you and your spouse made joint estimated tax payments for
2010 but file separate returns, either of you can claim all of your payments, or
you can divide them in any way on which you both agree. If you cannot agree, the
estimated tax you can claim equals the total estimated tax paid times the tax
shown on your separate return for 2010, divided by the total of the tax shown on
your 2010 return and your spouse's 2010 return.
If you claim any of the payments on your tax return, enter your
spouse's or former spouse's social security number in the space provided on the
front of Form 1040 or Form 1040A. If you were divorced and remarried in 2010,
enter your present spouse's social security number in that space and enter your
former spouse's social security number, followed by "DIV" to the left of Form
1040, line 62, or Form 1040A, line 39.