Loan Guides & Resources
The guides are the longer reads that sit behind the calculators. A calculator tells you what a loan costs at the numbers you type in. A guide explains where those numbers come from, which of them you can change, and what a lender is looking at when it prices you. Each one follows a single worked example from the first section to the last, so the figures add up and you can check them yourself.
Where to start
Read the guide that matches your situation instead of going in order.
- Buying a first home
- Start with the First-Time Homebuyer Guide, then How Mortgages Work for the payment math and PMI.
- Refinancing
- How Mortgages Work covers when a refinance pays for itself. Understanding Amortization shows why restarting a 30-year schedule costs more than the lower rate suggests.
- Student debt
- Student Loan Repayment Strategies walks through the standard plan, how income-driven formulas set a payment, PSLF, and what a forbearance really costs.
- Starting or growing a business
- The Business Financing guide prices the same $100,000 through each kind of lender. The SBA Loan guide covers the application from the first form to closing.
- Rebuilding credit
- The Credit Building guide lays out a twelve-month plan using a credit-builder loan and a secured card, and does the arithmetic on payday and title loans so you can see the cost before you sign.
- Told your debt-to-income ratio is too high
- The DTI guide explains what was counted, what the limit is for each loan program, and how to bring the number down.
Every guide links to the calculators it draws on, and every calculator links back to the guide for its loan type. The loop is short on purpose: read the section that answers your question, open the calculator with your own numbers, then come back when a result needs explaining.
Justin K. writes and maintains the guides along with the calculators. Program rules such as FHA premiums, VA funding fees, USDA income limits, and federal repayment plans are checked against the agency that sets them, and the guides cite those primary sources (CFPB, HUD, VA, USDA, studentaid.gov) rather than other summaries. Each guide shows the date it was last updated. If a figure looks stale, the contact page explains how to report it, and corrections change the page.
All guides
Mortgage & Home
How Mortgages Work: A Complete Guide to Home Financing
How a mortgage actually works, traced through one running example: the monthly payment, PMI, closing costs, rate shopping, and when refinancing later makes sense.
General Loan
Understanding Amortization: How Loan Payments Really Work
One $250,000 loan, followed from the first payment to the last. How the amortization formula works, why early payments barely dent the balance, and what extra payments actually save.
Auto & Vehicle
Auto Loans Explained: How to Finance a Car the Smart Way
How car financing actually works: new versus used math, dealer rate markup, why the 72-month loan costs so much, negative equity, gap coverage, and when a refinance pays off.
Personal Loan
Personal Loans Explained: Uses, Rates, and What to Watch For
What personal loans cost and where to get one: how origination fees change the real price, why APR is the only number worth comparing, the 36 percent ceiling, and cheaper alternatives.
Student Loan
Student Loan Repayment Strategies: A Complete Guide
How to pick a student loan repayment approach: the standard plan, how income-driven plans set payments, PSLF, what forbearance really costs, and why refinancing federal loans is hard to undo.
Credit & Debt
Understanding Your Debt-to-Income Ratio
What DTI measures, what lenders count as debt, the limits for each loan type, and specific ways to lower the ratio before you apply, all worked through one borrower.
Mortgage & Home
First-Time Homebuyer Guide: From Saving to Closing
A first purchase followed end to end: setting a real budget, choosing between FHA and conventional, surviving the offer and inspection, and what closing day actually costs.
Business Loan
SBA Loans Explained: Types, Eligibility, and How to Apply
What actually happens when you apply for an SBA loan: deciding whether the wait pays, assembling the file, getting through underwriting, and what closing really costs.
Credit & Debt
How to Build Credit and Steer Clear of Predatory Short-Term Loans
A working plan for building a credit score with credit-builder loans and secured cards, plus the real arithmetic on payday and title loans and where to borrow instead.
Business Loan
Business Financing Basics: Matching the Right Loan to the Need
Bank term loans, lines of credit, SBA loans, online lenders, and revenue-based financing compared head to head, with the same $100,000 priced through each one.
Real Estate Investing
Real Estate Investor Loans: DSCR, Hard Money, and Bridge Financing
How DSCR lenders underwrite a rental, shown through a full worked example, plus pricing, prepayment penalties, and where hard money and bridge loans fit.