1) Jim and Shirley Irvin, a newly married couple, will be filing a joint tax return for the first year. Because both work as independent contractors (both are soccer coaches), their income is subject to some variability. However, because their earnings are not taxed at the source, they know that they must pay estimated income taxes on a quarterly basis, based on their estimated taxable income for the year. To help calculate this tax, the Irvins would like to set up a spreadsheet-based decision model. Assume that they have the following information available:

Their only source of income is from their jobs as soccer coaches. The would like to put away 3% of their total income in a retirement account, up to a maximum of $4,000. Any amount the put in that account can be deducted from their total income for tax purposes. They are entitled to a personal exemption of $3,300 each. There is a standard deduction for married couples of $11,500, meaning this amount is free from any taxes and can be deducted from total joint income. Jim makes an estimated $41,000 and Shirley makes an estimated $36,000. The tax brackets are 9% for up to $17,000, 14% for $17,001 to $70,000, and 21% for $70,001 to $140,000. What are the estimated taxes per quarter that Jim and Shirley must pay?

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