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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2
votes
2answers
230 views

How is the 6th year on a 5/1 ARM calculated?

Given a 5/1 ARM for a $350,000 loan at a rate of 2.875%: After 5 years of paying at 2.875%, let's say the balance is $310,000. On the 6th year, the first adjustment kicks in an kicks the rate up 1% ...
8
votes
2answers
916 views

Credit card interest calculator with grace period & different interest rate calculation methods?

Is there an (ideally online) credit card interest calculator that includes grace periods and lets you choose the interest calculation method (eg, "adjusted balance", "average daily balance", ...
4
votes
2answers
1k views

How to calculate incremental interest rate for home refinancing?

Summary: When you refinance your house and borrow more money, how to calculate the incremental interest rate you pay? I currently owe $95K on my house, 4.75% interest rate, $510 monthly payment ...
4
votes
4answers
2k views

How to calculate credit card interest with respect to grace period transactions?

If my credit card currently has a $0 balance, and I make a transaction and pay it back within 25 days, I won't pay any interest, even if I had a balance and was paying interest previously. Is that ...
9
votes
7answers
405 views

What single metric is the ultimate measure of personal wealth?

More specifically, what is the single metric you would use to monitor personal wealth?
3
votes
1answer
424 views

Calculating fair value of an oanda.com box option

How do I calculate the theoretical "fair value" of an oanda.com box option? More specifically, how do I calculate the probability that a given FOREX parity will enter a given range in a given period ...
6
votes
6answers
5k views

Why do mortgage affordability recommendations use gross income?

Whenever I see someone ask how to calculate how big a mortgage he can afford, the answer almost always comes back as a percentage of gross income. Why use gross income as the baseline? Why not net ...
2
votes
2answers
2k views

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 ...
4
votes
1answer
175 views

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?
3
votes
3answers
4k views

How to calculate the rate of return on selling a stock?

How to calculate the rate of return on selling a stock?
8
votes
3answers
1k views

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 ...