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.

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Upcoming Tax Dates

July 1 Occupational excise taxes
File Form 11C to register and pay the annual tax if you are in the business of accepting wagers.

July 4 Everyone
Federal Holiday (Independence Day) - Details

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

July 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 June.

July 14 Regular method taxes
Deposit the tax for the last 15 days of June.

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

July 15 Nonpayroll withholding
If the monthly deposit rule applies, deposit the tax for payments in June.

July 27 Communications and air transportation taxes under the alternative method
Deposit the tax included in amounts billed or tickets sold during the last 15 days of June.

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

July 31 Social security, Medicare, and withheld income tax
File Form 941 for the second quarter of 2015. Deposit or pay any undeposited tax under the accuracy of deposit rules.

July 31 Certain small employers
Deposit any undeposited tax if your tax liability is $2,500 or more for 2015 but less than $2,500 for the second quarter.

July 31 Federal unemployment tax
Deposit the tax owed through June if more than $500.

July 31 All employers
If you maintain an employee benefit plan, such as a pension, profitsharing, or stock bonus plan, file Form 5500 or 5500EZ for calendar year 2014. If you use a fiscal year as your plan year, file the form by the last day of the seventh month after the plan year ends.

July 31 Form 720 taxes
File Form 720 for the second quarter of 2015.

July 31 Wagering tax
File Form 730 and pay the tax on wagers accepted during June.

July 31 Heavy highway vehicle use tax
File Form 2290 and pay the tax for vehicles first used in June.

View More Tax Dates