A generic tag to understand the calculations in a specific case. Please give out a sample illustration and ask a specific question. Ideally should also be accompanied by specific subject tags like "credit-cards", "savings-account", "index-funds" etc.

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Formula for calculating real cost of a deductible expense

Nice round numbers: say I perform a job that gets $1000 gross (call this g) in which I incur $100 in expense (call this e). The expense is fully deductible. Assume my marginal tax rate is 25% (call ...
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If you owe tax, how does the IRS failure-to-file penalty work?

If you owe tax, how does the IRS failure-to-file penalty work?
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How to calculate the rate of return on selling a stock?

How to calculate the rate of return on selling a stock?
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How to determine new, lower interest payments after a lump sum mortgage payment, i.e. new amortization schedule?

Here's a financial math problem: I have a mortgage at about $78,0000 with 5.5% interest and 56 of 360 monthly payments were made. I'm currently paying about $360/month in interest charges. If I pay ...