Articles
Explanations, guides and things worth knowing — some next to a calculator, some standing entirely on their own.
What a rate change does to your mortgage payment
Central banks move rates in quarter points, and lenders pass them on in steps that look small on paper. Here is what each step is actually worth on a monthly payment, and why two borrowers with the same mortgage feel the same change differently.
How much can I borrow, and what does a lender actually count?
The number a lender will give you is not your salary times four. It is a payment they think you can still afford if rates rise, worked backwards into a loan — which is wh...
Fixed or variable: how to choose the way your rate is set
The choice is not a forecast about rates. It is a question about how much a known payment is worth to your household, and how far the variable rate would have to move bef...
2026 tax brackets, and what the One Big Beautiful Bill actually did to them
Every 2026 bracket moved up, but not by the same amount — a 2025 law gave the bottom two brackets a larger inflation bump than the rest. Here is what that is worth on a r...
How the euro, dollar and pound moved against each other in 2024
10,000 euros converted to dollars in January 2024 and again in December would have produced two noticeably different amounts. Here is the shape of the year, and why the d...
What the Fed's 2024 rate cuts did to your emergency fund
A high-yield savings account paying 5% in January was paying closer to 4.25% by December, after three Fed rate cuts. Here is what that drop actually cost on a typical eme...
Mortgage rates in 2024: what a year of swings was actually worth on a payment
The average 30-year fixed rate touched a two-year low in late September 2024, then rose again by December. Here is what the difference between the low and the high was ac...
The SAVE plan in 2024: what it was designed to do, and what the courts paused
A single change to how discretionary income is defined turned a $186 monthly student loan payment into $46 under the SAVE plan's design — before litigation paused it for...
What credit cards actually charged in 2024, and what carrying a balance cost
Card rates barely moved with the Fed in 2024 because most of them had already priced in years of increases. Here is what an average balance actually cost to carry, and wh...
Minimum wage in 2024: fifteen years frozen federally, far from frozen by state
The federal minimum has not moved since 2009, but by 2024 most states had long since set their own, much higher floor. Here is what full-time minimum-wage work was actual...
How much you can put into a 401(k) and IRA in 2024
Every major retirement account limit rose for 2024 — some by more than others. Here is the full table, and what the gap between the old and new numbers is worth over time...
2024 tax brackets, and what they actually do to your paycheck
Brackets moved up, the standard deduction moved up, and most people paid a slightly smaller share of their income to inflation adjustments alone. Here is the arithmetic f...
What these articles are for
Some explain a question behind a calculator: which number belongs where, which rule applies to you, what the answer means. Others stand on their own and have nothing to do with a calculator. Either way, the arithmetic itself stays on the calculator pages — an article only ever explains, it never computes.