CalcVault Guides
Short, honest, jargon-free articles to help you make better money decisions. Every guide is written by a real human, reviewed for accuracy against primary sources, and updated as rules and rates change. No sponsored content. No paywalls.
Mortgages
Mortgage Basics: Everything to Know Before You Borrow
How mortgages actually work — principal, interest, escrow, PMI, points, APR vs rate, fixed vs adjustable, and the mistakes first-time buyers make most often.
First-Time Homebuyer Guide: Loans, Assistance, and the Road to Closing
FHA vs VA vs USDA vs conventional loans, down-payment assistance, the pre-approval to closing timeline, and the mistakes first-timers make most.
When to Refinance Your Mortgage (and When Not To)
The break-even rule, rate-and-term vs cash-out, why a shorter term often beats a lower payment, and the cases where refinancing loses money.
Mortgage Points: Are They Worth It?
Discount vs origination points, the ~60-month break-even for a typical buydown, and the three-way choice: points vs a bigger down payment vs a lender credit.
Rent vs Buy: The Real Math
The true cost of owning beyond the mortgage payment, the opportunity cost of your down payment, the 5-year horizon rule, and how to find your break-even.
PITI & Escrow Explained: Why Your Mortgage Payment Changes
The four parts of your monthly payment, how escrow accounts work, and why your payment jumps even on a fixed-rate loan.
Credit Score & Mortgage Rates: What a Few Points Cost You
How score bands change the rate you are offered, what a 40-point gap costs per month, and the fastest steps to raise your score before applying.
All Guides
How to Build a Budget That Actually Works
A practical, judgment-free walkthrough of building a monthly budget — fixed vs variable expenses, the envelope method, zero-based budgeting, and how to pick the approach that fits your personality.
Retirement Accounts Explained: 401(k), IRA, Roth, and HSA
A plain-English comparison of the major U.S. retirement account types, contribution limits, tax treatment, and how to prioritize them based on your situation.
When to Claim Social Security: 62 vs FRA vs 70
The trade-offs behind one of the highest-leverage retirement decisions — how early claiming reduces your check, how delaying past FRA grows it, and how to weigh health, longevity, and need.
Social Security for Married Couples
How spousal and survivor benefits work, why the higher earner's claiming age matters for both spouses, and coordination strategies that maximize a couple's lifetime income.
How Social Security COLA Works (2026)
What the annual Cost of Living Adjustment is, how SSA calculates it from the CPI-W, and what the 2026 COLA means for your monthly benefit.
Are Social Security Benefits Taxable? (2026)
How the IRS uses provisional income to tax 0%, 50%, or up to 85% of your benefits — with a worked example, state-tax rules, and ways to lower the bill.
Social Security for Divorced Spouses: The 10-Year Rule (2026)
How divorced-spouse benefits work, the 10-year marriage rule, remarriage effects, and survivor benefits for surviving divorced spouses.
Working While Collecting Social Security: The 2026 Earnings Test
The 2026 earnings test limits ($24,480 / $65,160), how withheld benefits are recalculated at FRA, and why early filing while working is less costly than it looks.
Understanding Compound Interest (With Real Examples)
Why compound interest is called the eighth wonder of the world, the formula behind it, and concrete examples showing how time in the market beats timing the market.
About These Guides
CalcVault guides are designed to pair with our free calculators. Each article explains the "why" behind the math: what the numbers mean, which assumptions matter, and how to apply the result to a real decision. If a guide references a figure that changes annually (tax brackets, contribution limits, inflation-indexed thresholds), we update it at the start of the calendar year and note the review date on the page.
Have a topic you'd like covered? Email [email protected]. We read every message.
Important: CalcVault guides are for informational and educational purposes only. Nothing on this site is financial, tax, investment, or legal advice. Always consult a qualified professional before making financial decisions specific to your situation.