Guides & articles

Read the math before you need it.

Every guide on HowAffordable shows the actual formula, cites where the numbers come from, and works through one real example — not just a rule of thumb. All 17 guides are live now, covering home and car affordability, mortgages, credit, debt payoff, and closing costs — more added as the hub keeps growing.

All 17 guides

01

How Much House Can You Afford on $70,000 a Year?

Pre-approval math and comfortable math aren't the same calculation — here's the worked example that shows the ~$35,000 gap between them.

Affordability7 min read · Updated Aug 2026Read →
02

PMI Explained: How Long You Pay It, and How to Remove It

Conventional PMI cancels itself — if you know when to ask. FHA's MIP is a different, stricter program. Both, with real dollar figures.

Mortgage insurance9 min read · Updated Aug 2026Read →
03

Renting vs. Buying: How to Know Which Makes Sense

The honest break-even math depends on one thing most calculators skip: whether you'd actually invest what you save.

Rent vs. buy8 min read · Updated Aug 2026Read →
04

Leasing vs. Buying a Car: The Real Cost Comparison

A lease payment almost always looks smaller than a loan payment on the same car — the six-year total tells a different story, and it isn't close.

Leasing9 min read · Updated Sep 2026Read →
05

Keeping a Paid-Off Car vs. Buying New Under Warranty

A paid-off car's worst repair year rarely costs a quarter of what twelve months of a new-car payment runs — the actual numbers, by vehicle age.

Auto8 min read · Updated Sep 2026Read →
06

The 20/4/10 Rule: A Smarter Way to Shop for a Car

Approval math and comfortable math aren't the same test — the 20/4/10 rule catches everything a payment-only calculation leaves out.

Auto9 min read · Updated Sep 2026Read →
07

Fixed-Rate vs. Adjustable-Rate Mortgages: What Actually Matters

An ARM's lower start rate is real savings — until the reset. Here's exactly when the break-even flips against you.

Mortgage rates8 min read · Updated Sep 2026Read →
08

What Actually Moves Your Credit Score Before a Big Purchase

Two factors move your score before a big purchase, and one of them can shift within a single billing cycle.

Credit8 min read · Updated Sep 2026Read →
09

Closing Costs Explained: Every Line Item on Your Disclosure

A five-page Closing Disclosure with a cash-to-close number thousands higher than the price and down payment — decoded line by line.

Closing costs8 min read · Updated Sep 2026Read →
10

New vs. Certified Pre-Owned: Where the Real Savings Are

Almost all the reassurance of new, at a real discount — but “almost all the reassurance” and “a real discount” both hide specifics worth checking.

Auto8 min read · Updated Sep 2026Read →
11

15-Year vs. 30-Year Mortgage: The Total Interest Trade-Off

The 15-year term wins on total interest by an amount most buyers never see spelled out — here's exactly how much.

Mortgage rates8 min read · Updated Sep 2026Read →
12

How Debt-to-Income Ratio Decides What You Can Actually Borrow

The number that actually sets your borrowing ceiling, and the one most first-time buyers have never calculated for themselves.

DTI8 min read · Updated Sep 2026Read →
13

Avalanche vs. Snowball: Paying Down Debt Before You Buy

The math favors one method. Human behavior often favors the other. Which one actually gets your debt paid off first.

Debt8 min read · Updated Sep 2026Read →
14

First-Time Homebuyer Programs and Down Payment Assistance, Explained

2,746 active down payment assistance programs nationwide — and most buyers who'd qualify never look, because of two wrong assumptions.

Programs8 min read · Updated Sep 2026Read →
15

Trade-In vs. Private Sale: Which One Actually Nets You More Money

“You'll always get more selling it yourself” is true often enough to repeat as fact — and wrong often enough to cost real money.

Auto8 min read · Updated Sep 2026Read →
16

Property Taxes and Insurance: The Hidden Monthly Costs Beyond Principal & Interest

The exact same $300,000 home can carry a monthly cost hundreds of dollars apart, depending purely on which state it's in.

Mortgage8 min read · Updated Sep 2026Read →
17

Building an Emergency Fund Before You Buy a Home or Car

Reserves are the number most lenders barely require and most advisors insist on anyway — here's the realistic version for a first-time buyer.

Reserves9 min read · Updated Sep 2026Read →
No guides match that — try a shorter word, or clear the filter.

Have a topic you want covered next? Tell us on the Contact page →