You and your husband will pay federal income taxes based on how much profit you made from your business plus what he earned. You will be able to reduce this total earning by a standard deduction. In 2009 the standard deduction for a married couple was $11,400. So if your profit was $9,000 and your spouse made $30,000 you total income was $39,000. $39,000-$11,400 = $27,600. You would owe about $2,200 in federal income taxes.
You would also owe social security taxes on your profit or about $1,350 ($9,000 x 15.3%). The total is about $3,500. This is rough because I don't know all your family's situation.

Let's assume the above numbers are your situation. You must pay in the $3,500 throughout the year, either through you husband's withholding through work, or you can file the quarterly Estimated Tax form. Any money that is paid in throughout the year is applied to both your federal income tax and social security tax. You don't write a separate check for social security tax.

Tom

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