Think back to your last income tax return. Did you owe Uncle Sam a lot of money, or did he give you a big refund? Whatever your situation, you can influence next year's outcome by adjusting your payroll withholding.

Remember the IRS Form W-4, Employee's Withholding Allowance Certificate, your employer asked you to complete on your first day? "The number of personal allowances you designate on Form W-4 determines the amount of federal income tax withheld from each paycheck," explains TaxACT spokesperson Jessi Dolmage. "The total amount withheld for the year is credited against your income tax liability."

You can modify your withholding at any time of year by submitting a new Form W-4 to your employer. In order to minimize taxes owed at the time of filing, set your allowances to zero on your W-4. To increase take-home pay but potentially owe more money at tax time, increase your allowances.

Each of the following should be counted as one allowance:

  • Yourself (if no one can claim you as a dependent on a tax return)
  • Each dependent
  • You claim the child tax or child and dependent care credits on your tax return
  • Your tax return filing status is Head of Household

If you have income from multiple jobs or your spouse works, withholding is usually the most accurate when counting all allowances on the W-4 for the highest paying job. Then claim zero allowances on W-4s for all other jobs.

Fortunately, there are free and easy solutions to help you calculate the appropriate withholding. The IRS offers Publication 505 and a withholding calculator at www.irs.gov.

TaxACT also offers a free withholding calculator. "After registering for TaxACT Free Federal Edition, click on the 'Next Year' tab to answer simple questions about your allowances," says Dolmage. "TaxACT will also complete a new Form W-4 that you can print and give to your employer."

Self-employed individuals should calculate net income and estimated taxes owed each quarter. Submit your quarterly estimated taxes along with Form 1040-ES, Estimated Tax for Individuals.

To adjust withholding for unemployment or social security payments, give Form W-4V to the payer. Submit Form W-4P to payers of pension, annuity and other deferred compensation.

In addition to reviewing your withholding when you get a new job, it's important to review your withholding whenever experiencing a major life change, such as:

  • Marriage or divorce
  • Birth or adoption
  • Increase or decrease in income e.g., you get a part-time weekend job or spouse becomes stay-at-home parent
  • Buy a house
  • Retirement
  • Change in interest or dividend income
  • Change in itemized deductions

If you live in an income-taxing state and want to adjust your state withholding, you'll need to complete the appropriate withholding form for your state.

For more information about withholding and Form W-4, visit www.irs.gov. Learn more about TaxACT's free federal solution at www.taxact.com.

September 2015
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Upcoming Tax Dates

September 7 Everyone
Federal Holiday (Labor Day) - Details

September 10 Employees who work for tips
If you received $20 or more in tips during August, report them to your employer - Details

September 10 Communications and air transportation taxes under the alternative method.
Deposit the tax included in amounts billed or tickets sold during the first 15 days of August.

September 14 Regular method taxes
Deposit the tax included in amounts billed or tickets sold during the last 16 days of August.

September 15 Individuals
Make a payment of your 2015 estimated tax if you are not paying your income tax for the year through withholding (or will not pay in enough tax that way). Use Form 1040-ES. This is the third installment - Details

September 15 Corporations
File a 2014 calendar year income tax return (Form 1120) and pay any tax, interest, and penalties due. This due date applies only if you timely requested an automatic 6-month extension - Details

September 15 S Corporations
File a 2014 calendar year income tax return (Form 1120S) and pay any tax due. This due date applies only if you timely requested an automatic 6-month extension - Details

September 15 Partnerships
File a 2014 calendar year return (Form 1065). This due date applies only if you were given an additional 5-month extension - Details

September 15 Corporations
Deposit the third installment of estimated income tax for 2015 - Details

September 15 Social security, Medicare, and withheld income tax
If the monthly deposit rule applies, deposit the tax for payments in August.

September 15 Nonpayroll withholding
If the monthly deposit rule applies, deposit the tax for payments in August.

September 25 Communications and air transportation taxes under the alternative method.
Deposit the tax included in amounts billed or tickets sold during the last 16 days of August.

September 29 Regular method taxes
Deposit the tax for the first 15 days of September.

September 29 Regular method taxes (special September deposit rule)
Deposit the tax for the period beginning September 16 and ending September 26.

September 29 Communications and air transportation taxes under the alternative method (special September deposit rule).
Deposit the tax included in amounts billed or tickets sold during the period beginning September 1 and ending September 11.

September 30 Wagering tax
File Form 730 and pay the tax on wagers accepted during August.

September 30 Heavy highway vehicle use tax
File Form 2290 and pay the tax for vehicles first used in August.

View More Tax Dates