| Steven Albert,CPA - Dear Earl,
Your estimates can be calculated based on the safe harbor prior year tax liability (100% of prior year liability, if adjusted gross income is at last $150,000, you must pay in 110% of last year’s liability) or if lower, using the “annualized income installment method”.
The required quarterly estimates can be calculated based on actual income and deductions in each quarter. There is a presumption that the withholding of taxes are evenly paid throughout the year. However, you can use the actual withholdings by quarter. In annualizing, use the withholding for the entire year so the extra estimates should only be on the extra earnings. Form 2210 and its instructions walk you through how to do the calculation. Basically, you annualize your income for the first three, five and eight months and calculate the tax liability. Then you take 22.5%, 45%, and 67.5% respectively. Make sure your calculation considers the self-employment tax (social security tax). Make sure you also do estimates for Maryland. Their penalty rate is 13% annualized. The Federal rate is approximately 6%.
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