Tax 1040 Tax Calculator Enter your filing status, income, deductions and credits and we will estimate your total tax. Based on your projected withholdings for the year, we can also estimate your tax refund or amount you may owe the IRS next April. Estate Tax Planning Knowing your potential estate tax liability is a great place to start your estate tax plan. Use this calculator to estimate your estate tax liability. Payroll Deductions Calculator Use this calculator to help you determine the impact of changing your payroll deductions. Self-Employment Tax Calculator If you are self-employed, operate a farm or are a church employee use this calculator to determine your self-employment taxes for the current tax year.