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The federal income tax is a pay-as-you-go tax. You must pay the tax as you earn or receive income during the year. There are two ways to pay as you go.
Withholding. If you are an employee, your employer probably withholds income tax from your pay. In addition, tax may be withheld from certain other income, such as pensions, bonuses, commissions, and gambling winnings. The amount withheld is paid to the Internal Revenue Service (IRS) in your name.
Estimated tax. If you do not pay your tax through withholding, or do not pay enough tax that way, you might have to pay estimated tax. People who are in business for themselves generally will have to pay their tax this way. You may have to pay estimated tax if you receive income such as dividends, interest, capital gains, rents, and royalties. Estimated tax is used to pay not only income tax, but other taxes such as self-employment tax and alternative minimum tax.
This publication explains both of these methods. It also explains how to take credit on your return for the tax that was withheld and for your estimated tax payments.
If you did not pay enough tax during the year, either through withholding or by making estimated tax payments, you may have to pay a penalty. Generally, the IRS can figure this penalty for you. This underpayment penalty, and the exceptions to it, are discussed in chapter 4.
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Use your 2014 tax return as a guide in figuring your 2015 estimated tax, but be sure to consider the following.
Standard mileage rates. The 2015 rate for business use of your vehicle is 57½ cents per mile. The rate for use of your vehicle to get medical care or move is 23 cents per mile. The rate of 14 cents per mile for charitable use is unchanged.
Personal exemption increased for certain taxpayers. For 2015, the personal exemption amount is increased to $4,000 for taxpayers with adjusted gross income at or below $309,900 if married filing jointly or qualifying widow(er), $284,050 if head of household, $258,250 if single, or $154,950 if married filing separately. The personal exemption amount for taxpayers with adjusted gross income above these thresholds may be reduced.
Limitation on itemized deductions. For 2015, itemized deductions for taxpayers with adjusted gross income above $309,900 if married filing jointly or qualifying widow(er), $284,050 if head of household, $258,250 if single, and $154,950 if married filing separately may be reduced.
Alternative minimum tax (AMT) exemption amount increased. The AMT exemption amount is increased to $53,600 ($83,400 if married filing jointly or qualifying widow(er); $41,700 if married filing separately).
Retirement savings contribution credit income limits increased. In order to claim this credit for 2015, your MAGI must be less than $30,500 ($61,000 if married filing jointly; $45,750 if head of household).
Adoption credit or exclusion. The maximum adoption credit or exclusion for employer-provided adoption benefits has increased to $13,400. In order to claim either the credit or exclusion, your MAGI must be less than $241,010.
Three or more children lived with you and you earned less than $47,747 ($53,267 if married filing jointly),
Two children lived with you and you earned less than $44,454 ($49,974 if married filing jointly),
One child lived with you and you earned less than $39,131 ($44,651 if married filing jointly), or
A child did not live with you and you earned less than $14,820 ($20,330 if married filing jointly).
Also, the maximum MAGI you can have and still get the credit has increased. You may be able to take the credit
if your MAGI is less than the amount in the above list that applies to you. The maximum investment income you can have and
get the credit has increased to $3,400.
Future developments. The IRS has created a page on IRS.gov for information about Publication 505 at www.irs.gov/pub505. Information about any future developments affecting Publication 505 (such as legislation enacted after we release it) will be posted on that page.
Health care coverage. When you file your 2015 tax return in 2016, you will need to either (1) indicate on your return that you and your family had health care coverage throughout 2015, (2) claim an exemption from the health care coverage requirement for some or all of 2015, or (3) make a payment if you do not have coverage or an exemption(s) for all 12 months of 2015. See Form 8965 and its instructions for more information on claiming an exemption or making a payment.
Advance payments of the premium tax credit. If you buy health insurance through the Health Insurance Marketplace, you may be eligible for advance payments of the premium tax credit to help pay for your insurance coverage. Receiving too little or too much in advance will affect your refund or balance due. Promptly report changes in your income or family size to your Marketplace. You may want to consider this when figuring your estimated taxes for 2015. See Form 8962 and its instructions for more information.
Additional Medicare Tax. A 0.9% Additional Medicare Tax applies to Medicare wages, Railroad Retirement Tax Act compensation, and self-employment income over a threshold amount based on your filing status. You may need to include this amount when figuring your estimated tax. You may also request that your employer deduct and withhold an additional amount of income tax withholding from your wages on Form W-4, Employee's Withholding Allowance Certificate.
Net Investment Income Tax. You may be subject to Net Investment Income Tax (NIIT). NIIT is a 3.8% tax on the lesser of net investment income or the excess of your modified adjusted gross income (MAGI) over the threshold amount. NIIT may need to be included when figuring estimated tax. You may also request that your employer deduct and withhold an additional amount of income tax withholding from your wages on Form W-4.
Photographs of missing children. The Internal Revenue Service is a proud partner with the National Center for Missing and Exploited Children. Photographs of missing children selected by the Center may appear in this publication on pages that otherwise would be blank. You can help bring these children home by looking at the photographs and calling 1-800-THE-LOST (1-800-843-5678) if you recognize a child.
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