Money Essentials

Basic tax questions

Money's guide to taxes has answers to your basic tax questions.

1. If you get a big refund each year, you're having too much withheld from your paycheck.

In effect, you're giving the government an interest-free loan.

2. If you have too little withheld, you may be charged an underpayment penalty.

You must pay 90% of what you owe for the tax year by the end of that year or an amount equal to 100% of your tax liability for the previous tax year, whichever is smaller.

3. Not every dollar of your taxable income is taxed at the same rate.

That's because portions of your earned income fall into different brackets, which are assigned different tax rates. Generally speaking, the first dollar you make will be taxed at a lower rate than your last dollar. Your marginal tax rate is the tax bracket at which the highest (or last) portion of your income is taxed.

4. Your combined tax bracket determines how much tax you'll owe on income from investments such as CDs and money market funds.

Your combined bracket is the sum of your top (or marginal) federal tax rate and your top state income tax rate. It may be less if you itemize deductions since you will be able to deduct your state income tax on your federal return.

5. If you file your return by April 15, but don't pay the tax you owe, you may receive a late payment penalty.

The same goes if you file for an extension. An extension only allows you to file your return after the due date. But full payment is still required by April 15. If you make a partial payment by then, you may be charged interest on the amount outstanding.

6. You can reduce your chances of being audited.

One of the best ways is to fill out your return completely, correctly, and on time every year.

7. You should pay estimated taxes if you're self-employed; expect hefty investment income or profits from a property sale; or if you don't have enough taxes withheld to cover the taxes you'll owe on non-wage-related income.

Retirees should also consider paying them if they haven't opted for voluntary withholding on their pension or IRA payments. Estimated taxes are due four times a year (April 15, June 15, Sept. 15, and Jan. 15).

8. Your adjusted gross income (AGI) is your total income minus certain "above the line" deductions such as deductible IRA contributions, alimony payments, or health savings account contributions.

Your AGI primarily determines whether or not you're eligible for tax breaks. Almost every break, be it a deduction, exemption, or a credit, has its own AGI limit.

9. Your taxable income is your AGI minus exemptions and deductions.

The less your taxable income, the less in taxes you'll owe. That's why it's in your best interest to take advantage of tax breaks where you can.

10. A credit is better than a deduction.

A credit is a dollar-for-dollar reduction of the taxes you owe. A $100 credit means you pay $100 less in taxes. A deduction reduces the taxes you owe by a percent of every dollar you're allowed to deduct.

You calculate the worth of your deduction by multiplying your marginal (or top) tax rate by the amount of the deduction. If you're in the 25% tax bracket, a $100 deduction means you'll pay $25 less in taxes (0.25 times $100).

take the test
the test
more lessons
More Money Essentials
They're hiring!These Fortune 100 employers have at least 350 openings each. What are they looking for in a new hire? More
If the Fortune 500 were a country...It would be the world's second-biggest economy. See how big companies' sales stack up against GDP over the past decade. More
Sponsored By:
More Galleries
Top-paying jobs Orthopedic surgeons take home a median $410,000 in salary and bonus annually. What other great careers from CNNMoney and's list of Best Jobs in America offer hefty paychecks? More
Fastest-growing jobs Demand for IT security consultants are projected to grow a solid 37% between 2012 and 2022. What other careers on CNNMoney and's list of America's best jobs will see big opportunities? More
Best Jobs in America CNNMoney/PayScale's top 100 careers with big growth, great pay and satisfying work. More

Updated 11/23/2011 with SEO tweaks - abell
Updated 7/27/2012 content changes - aross
Updated 7/30/2012 content changes - aross

Most stock quote data provided by BATS. Market indices are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer.

Morningstar: © 2015 Morningstar, Inc. All Rights Reserved.

Factset: FactSet Research Systems Inc. 2015. All rights reserved.

Chicago Mercantile Association: Certain market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved.

Dow Jones: The Dow Jones branded indices are proprietary to and are calculated, distributed and marketed by DJI Opco, a subsidiary of S&P Dow Jones Indices LLC and have been licensed for use to S&P Opco, LLC and CNN. Standard & Poor's and S&P are registered trademarks of Standard & Poor’s Financial Services LLC and Dow Jones is a registered trademark of Dow Jones Trademark Holdings LLC. All content of the Dow Jones branded indices © S&P Dow Jones Indices LLC 2015 and/or its affiliates.