Guides & analysis
Long-form explanations of the decisions our calculators support. Every figure in these articles is computed from the same formulas the tools use, so you can reproduce any number you see.
On $85,000 of Self-Employed Income, Set Aside $5,307.50 Every Quarter
Self-employment tax is the line that catches people out: 15.3% on top of income tax, with no employer paying half. Here is the full calculation, the safe-harbour rule that prevents penalties, and why 25% to 30% is the figure to move on receipt.
A $28,000 Degree Today Costs $290,439 for a Newborn
College costs have compounded faster than general inflation for decades. Running that forward eighteen years produces a number most parents have not seen, and it changes what a reasonable monthly contribution looks like.
June 24, 2026To Take Home $90,000 Freelancing, You Need to Bill $132.76 an Hour
Dividing your target salary by 2,080 hours produces $43.27 and a business that fails within two years. Here is the full calculation, including the two costs that employees never see and the hours you cannot bill.
June 17, 2026The 28/36 Rule Says You Can Borrow $406,000. The Real Number Is $300,000.
Most affordability calculators quietly forget that property tax and insurance come out of the same 28% as your mortgage payment. On a $110,000 income, that omission overstates your budget by six figures.
June 9, 2026Renting Won This $400,000 Comparison by $12,705, and It Was Close
Buying is not automatically better than 'throwing money away on rent'. We ran a full five-year comparison including maintenance, selling costs, and what a renter does with the down payment. The result depends on three assumptions, and one of them dominates everything.
May 28, 2026A Lower Rate That Costs You $55,000: The Refinance Trap
Dropping from 7% to 6% cut this borrower's payment by $360 a month and added $54,936 to their lifetime interest. The rate was not the problem. The term reset was. Here is how to tell the difference.
May 13, 2026You Would Need to Spend $37,485 for 2% Cashback to Cover Your Interest
Rewards cards are excellent for people who pay in full and quietly terrible for everyone else. Here is the break-even, plus the minimum payment structure that turns a $6,000 balance into an eighteen-year commitment.
May 6, 2026120 Credit Score Points Are Worth $102,316 on One Mortgage
Credit scores feel abstract until you price them. On a $300,000 loan, the gap between excellent and fair credit is $284 a month and six figures in lifetime interest. Here is what actually moves the number, ranked by weight.
April 30, 2026Avalanche vs. Snowball: What $11,400 of Card Debt Actually Costs Either Way
One method is mathematically optimal. The other clears its first debt 26 months sooner. We ran both against the same three cards and the same budget. The gap is smaller than the internet arguments suggest.
April 22, 2026Roth vs. Traditional Is a Bet on One Number, and It Is Not Your Return
At identical tax rates, the two accounts produce identical results, to the dollar. The entire decision rests on whether your tax rate in retirement will be higher or lower than it is today, plus one detail about contribution limits that most comparisons miss.
April 8, 2026Leasing Costs $7,584 More Over Six Years, Unless You Were Trading In Anyway
The lease-versus-buy argument usually compares monthly payments, which is the one comparison guaranteed to mislead. Here is the six-year total on a $40,000 car, and the money factor trick worth knowing before you negotiate.
March 25, 2026The 4.50% Account Beat the 4.60% One. Here Is Why.
Comparing cash accounts on their advertised rate ignores the one factor that changes the ranking: how each is taxed. On $25,000, the lowest-rate option finished ahead by $112.50 a year.
March 17, 2026No, a Raise Cannot Push You Into a Bracket That Costs You Money
The most persistent myth in personal finance is that earning more can leave you with less. Here is how progressive brackets actually work, why your effective rate is far below your marginal rate, and the handful of real cliffs that do exist.
March 4, 2026APR, APY, and Interest Rate Are Three Different Numbers
They look interchangeable and are not. One includes fees, one includes compounding, and one includes neither. Confusing them is how a 6.25% mortgage ends up more expensive than a 6.75% one.
February 27, 2026Stretching $45,000 of Student Debt From 10 Years to 25 Costs $30,008
The extended plan cuts the payment by $207 a month, which is exactly why it is popular. Here is the full comparison across four terms, plus the situations where the expensive option is still the right call.
February 19, 2026Why Your First Mortgage Payment Is 86% Interest
Amortization is not a bank trick, but it does front-load interest in a way that surprises most borrowers. Here is the arithmetic, a year-by-year breakdown of a real $300,000 loan, and what it means for prepaying, refinancing, and selling early.
February 11, 2026Your Emergency Fund Costs $11,546 in Forgone Growth. Keep It Anyway.
Holding six months of expenses in cash is genuinely expensive, and the standard advice never puts a number on it. Here is what the insurance actually costs, why it is still worth buying, and how to size it for your own risk rather than a rule of thumb.
January 28, 2026Saving $300 a Month at 25 Beats $600 a Month at 35
A side-by-side comparison of two savers who end up in almost the same place, except one contributed $72,000 less. What compound interest rewards is not discipline or income. It is elapsed time.
January 19, 2026