Guides
The thinking behind the calculators: how each fee schedule really works, how to price for profit, what the loan numbers mean. Every guide is dated, cites its sources, and links to the calculator that does the arithmetic.
Mortgage payments explained: PITI, amortization and why the 15-year costs less
What's inside a monthly mortgage payment, how the level-payment formula works, why early payments are mostly interest, and what a shorter term or an extra $100 a month actually does.
Taxes for resellers and freelancers: the 1099-K, Schedule C and quarterly payments
When selling online becomes taxable income, what the 1099-K does and doesn't mean, how self-employment tax is calculated, and how much to set aside each quarter.