Understanding Your Financial Foundation

Lesson 1.1

Credit Scores: What They Are and How They're Calculated

Your credit score is a three-digit number that tells a lender how reliably you've managed debt in the past. Lenders use it as a quick, standardized risk measure. A higher score signals lower risk, which means better loan terms, lower interest rates, and access to more loan programs.

The FICO Score: What Mortgage Lenders Actually Use

Dozens of credit scoring models exist, but mortgage lenders primarily use FICO scores. Specifically, the versions developed for mortgage lending: FICO Score 2, 4, and 5. They pull scores from all three credit bureaus (Equifax, Experian, and TransUnion) and typically use the middle of the three scores for a single borrower, or the lower of the two middle scores for co-borrowers.

The "Predictive Score" Requirement

A high FICO score alone isn't enough. Lenders also need to know that your score is predictive, meaning it's based on enough credit history to actually forecast how you'll handle a mortgage. A 720 FICO derived from a single open account doesn't tell a lender much. To have a usable, predictive score, you generally need:

• At least 3 open and active tradelines (credit accounts such as credit cards, auto loans, student loans, or installment accounts)
• At least one tradeline open for 12 months or longer

If your credit file doesn't meet this threshold, a lender may not be able to use your score, even if the number itself looks strong. A well-rounded credit profile with multiple active accounts matters just as much as the score itself.

One thing people miss on the "active" requirement: for a revolving account like a credit card, active means actually used. A card that's been sitting untouched for two years doesn't count. A good rule of thumb — use it at least once every six months. Fill up your gas tank. Buy a small amount of groceries. Then pay it off the following month. That's it. That keeps the account reporting active activity to the bureaus and preserves its contribution to your predictive score.

Revolving credit also carries more weight than installment debt when it comes to the predictive score. An auto loan or student loan tells a lender you can make fixed scheduled payments. A revolving credit card tells them how you manage a variable credit line — which is much closer to how a HELOC or line of credit behaves. If you're building credit from scratch, getting and responsibly using a credit card is a bigger move than taking out an installment loan.

The general scoring range for FICO is 300–850. Here's how scores map to mortgage rates and program access:

The Five Factors That Make Up Your Score

FICO scores are calculated from five categories of credit behavior. Knowing each one tells you where to focus when you want to improve your score:

• Payment history (35%): The single most important factor. On-time payments build your score; late payments, collections, and charge-offs damage it. A 30-day late payment can drop a score 60–100 points. The damage fades over time but stays on your report for seven years.
• Amounts owed / credit utilization (30%): How much of your available revolving credit (credit cards) you're using. If you're starting with high balances, getting below 50% on each card is the first meaningful milestone — score improvement begins there. Below 30% is better. Below 10% is best. This is the most responsive factor. Paying down balances can raise your score within one billing cycle.
• Length of credit history (15%): How long your accounts have been open. Older accounts are better. Closing a long-standing account can hurt your score by reducing average account age and available credit.
• Credit mix (10%): Having a variety of account types, such as revolving credit (cards) and installment loans (auto, student, mortgage), shows lenders you can handle different kinds of debt.
• New credit / inquiries (10%): Applying for new credit triggers a "hard inquiry" that can temporarily lower your score by 5–15 points. Multiple mortgage inquiries within a short window (typically 14–45 days) are treated as a single inquiry, so rate shopping doesn't hurt you.

Lesson 1.2

Reading Your Credit Report

Your credit report is the underlying data that generates your credit score. Your score tells you the outcome; your report tells you why and where the problems are. Every prospective homebuyer should review their report at least six to twelve months before applying for a mortgage. Errors are more common than most people realize.

Getting Your Free Reports

You're entitled to one free credit report per year from each of the three bureaus through AnnualCreditReport.com, which is the federally mandated free access site. During certain periods, free weekly access has also been offered. Pull all three bureaus, because creditors don't always report to all three, and an error on one report won't necessarily show up on another.

Each bureau also lets you access your report directly through their own site: Experian, Equifax, and TransUnion. Going directly can be useful if you want to dispute an error — you'll deal with that bureau's dispute process rather than routing through a third party.

What's in Your Report

A credit report contains four main sections:

• Personal information: Your name, current and former addresses, Social Security number, date of birth, and employment history. Check this carefully. Errors here can sometimes point to identity theft or file mixing, where your file gets mixed up with someone who has a similar name or SSN.
• Account history: Every credit account you have or have had, including credit cards, auto loans, student loans, mortgages, and personal loans. Each entry shows the creditor, account number, credit limit or original balance, current balance, payment history, and account status (open, closed, charged off, in collections).
• Inquiries: Hard inquiries from credit applications (stay on report two years; affect your score for one year) and soft inquiries from account reviews and pre-approvals (these don't affect your score).
• Public records: This category has changed significantly in recent years. Bankruptcies are still reported — Chapter 7 stays on your report for 10 years, Chapter 13 for 7 years. Civil judgments and most tax liens are a different story. Starting in July 2017, all three major bureaus removed nearly all civil judgments and tax liens under new data standards that required full identity-matching (name, address, date of birth, and Social Security number). Most records didn't meet that bar, so they came off. One important caveat on tax liens: off your credit report doesn't mean gone. Lenders and title companies run independent public records searches at the county and state level. If a lien is filed, they will find it at closing. Medical debt is also in transition. The CFPB finalized a rule in early 2025 that would have banned medical debt from credit reports entirely, but a federal court vacated that rule in July 2025. As of now, medical collections can still appear on your report. The bureaus have voluntarily removed medical collections under $500, and major scoring models — FICO 9, FICO 10, and VantageScore 4.0 — no longer count medical debt against your score even when it does appear.

Common Errors to Look For

The Federal Trade Commission has found that roughly one in five consumers has an error on at least one credit report that could affect their score. Look for:

• Accounts that aren't yours (possible identity theft or file mixing)
• Late payments reported incorrectly (you paid on time but it shows late)
• Accounts showing a balance that were paid in full
• Accounts still showing as open that you closed
• Duplicate accounts (same debt listed more than once)
• Negative items older than seven years that should have fallen off

If you find an error, dispute it directly with the bureau that shows it. Each bureau has an online dispute process. Provide documentation such as a bank statement, letter from the creditor, or payment confirmation. The bureau has 30 days to investigate and respond. Resolving a dispute can improve your score meaningfully if the error involved a negative item.

Lesson 1.3

How to Improve Your Credit Score Before Applying

If your score isn't where you want it, improving it before you apply is one of the best things you can do financially. A score difference of 60 points can mean a half-point difference in your interest rate. On a $350,000 loan, that's roughly $115 per month, or about $41,000 over 30 years.

Quick Wins (Results in 30–90 Days)

• Pay down credit card balances. Utilization is the most responsive factor in your score. If you're carrying high balances relative to your limits, paying them down can produce visible score increases within one to two billing cycles. In practice, getting below 50% is where you'll see a real jump — that's the threshold where the scoring models start to reward you noticeably. Below 30% is the target for optimal scoring, but don't let perfect be the enemy of good. If you're sitting at 80% and can get to 45%, do it. You'll see the improvement on your next statement cycle.
• Pay every bill on time for the next 6+ months. If you have recent late payments, the best antidote is a consistent on-time payment record going forward. You can't erase recent lates, but you can dilute them.
• Don't close old accounts. Closing a card doesn't remove its payment history, but it does reduce your available credit, raising your utilization ratio. Leave old zero-balance accounts open unless they carry a high annual fee.
• Don't open new credit accounts. Every new application triggers an inquiry and lowers average account age. Avoid opening any new credit for at least 12 months before your planned mortgage application.

Longer-Term Strategies (6–24 Months)

• Become an authorized user. If someone with excellent credit (a parent, spouse, long-term partner) adds you to one of their old, low-balance credit cards as an authorized user, that account's history may appear on your report, boosting your average account age and available credit. The primary cardholder takes on the risk; get their permission and understanding first.
• Request a credit limit increase. If you have a card in good standing and your income has grown, request a higher limit. If the issuer doesn't do a hard pull, this immediately improves your utilization ratio without any new account.
• Address collections. Unpaid collection accounts can significantly lower your score. Newer FICO models (used for auto and some other lending) ignore paid collections; however, many mortgage scoring models still factor in the presence of collections accounts, paid or unpaid. Talk to a HUD-approved housing counselor if you have collections to understand the best strategy for your situation.

What Not to Do

• Don't pay off an old installment loan that still has a clean payment history. You lose a positive open account.
• Don't close cards to "simplify" your credit. It almost always hurts utilization.
• Don't open a new card to reduce utilization on another. The inquiry and new account age outweigh the utilization benefit in the short term.
• Don't rely on credit repair services that promise to remove accurate negative information. They can't.

Lesson 1.4

Debt-to-Income Ratio: The Number That Determines Loan Size

Your credit score is what gets you into the program. Your debt-to-income ratio (DTI) is what determines how large a loan you qualify for. Many buyers with solid credit scores are surprised to find they qualify for less than expected, usually because DTI is where they run into trouble.

How DTI Is Calculated

Your DTI is the percentage of your gross monthly income consumed by monthly debt obligations. Mortgage lenders calculate two versions:

• Front-end DTI (housing ratio): Proposed PITI ÷ gross monthly income. FHA requires this to stay below 31%; USDA below 29%. Conventional loans do not use a front-end ratio. The lender only looks at your back-end DTI. This is a meaningful difference — a payment that passes conventional can fail FHA solely because of the front-end cap, even when the back-end is fine.
• Back-end DTI (total debt ratio): (Proposed PITI + all other monthly minimum debt payments) ÷ gross monthly income. This is the primary ratio for all loan types. Conventional is generally capped around 45–50% depending on other qualifications. FHA's standard is 43%, but can go up to 57% with compensating factors. VA has no fixed cap but lenders typically want to see under 41–45%.

The numbers below come directly from the YMT Pre-Qualification Calculator — same borrower, same rate, four loan programs, so you can see exactly how each program's DTI rules produce different qualifying amounts:

Scenario: $7,000/month gross income • $450/month in other debt (car + student loan) • 6.50% rate, 30-year fixed • Tarrant County, Texas

Each program's max qualifying price is calculated by working backward from its back-end DTI ceiling — finding the highest monthly PITI the borrower's income and existing debts can support. Here is how the DTI math plays out for Conventional and FHA, which is where the front-end distinction matters most:

Conventional reaches its back-end ceiling at $2,700/month and qualifies with no front-end concern. FHA qualifies this borrower for a higher purchase price — $310,978 vs. $290,941 — because FHA's back-end ceiling is more flexible. But notice the FHA front-end ratio comes in at 40%, above the standard 31% threshold. FHA approval here depends on compensating factors. If those aren't present, the front-end cap becomes the binding constraint regardless of back-end. Conventional doesn't carry that variable.

Want to run your own numbers? The Pre-Qualification Calculator shows your max qualifying amount across all four loan types based on your actual income, debts, and target rate.

What Lenders Count as Debt

Counted in your DTI:

• Installment loans — car loans, student loans, personal loans
• Minimum credit card payments (not the full balance, just the minimum)
• Child support and alimony (court-ordered)
• Co-signed loans, even if someone else is making the payments
• Current rent payment (if it appears on your credit report or the lender requires documentation)

Not counted in your DTI:

• Utilities — electric, gas, water, trash, internet, cell phone
• Insurance premiums — car insurance, life insurance, health insurance, renters insurance
• Subscriptions — streaming services, gym memberships, software
• Groceries, gas, dining, clothing, and other day-to-day living expenses
• Rent (in most cases — lenders look at your debt obligations, not your current housing cost, unless it's on your credit report)

How to Improve Your DTI Before Applying

• Eliminate debts strategically — not just the smallest ones. The goal isn't to pay off the most accounts. The goal is to remove the most monthly payment from your DTI with the money you have available. Those aren't always the same thing. Paying down a balance only reduces the minimum payment by a small amount. Paying it off completely removes it from the DTI calculation entirely. So the question to ask is: which debt, if eliminated, frees up the most room? Sometimes that's a collection of small balances with small minimum payments — and wiping them out in total moves the needle. But sometimes you have a car loan with a $550/month payment and only 8 months left. Paying off that one loan removes $550/month from your DTI in a single transaction. That's often a better use of $4,000–$5,000 than paying off four smaller debts with $50–$75 minimum payments each. Run the math before you decide. Look at each debt's remaining balance and its monthly payment obligation. The one with the highest payment-to-remaining-balance ratio is usually your best target.
• Increase income before applying. DTI is a ratio. Increasing your gross income directly improves it. A raise, a second income, or income from rental property can all help. Document income sources for two years for lenders to count them.
• Target the right loan program. FHA allows higher DTIs than conventional for borrowers who have compensating factors (strong reserves, higher down payment). If you're borderline, FHA may be the right fit.

Lesson 1.5

Building an Emergency Fund Before You Buy

This is the lesson most homebuyer resources skip, and it's the one that causes the most financial pain after closing. Don't buy a home until you have an emergency fund in place, separate from your down payment and closing costs.

Why Homeownership Changes Your Financial Risk Profile

Renters who hit a financial emergency, whether it's a job loss, a medical bill, or a major car repair, have options. They can downsize, relocate, or cut spending. A homeowner facing the same situation still owes the mortgage. Miss a payment and your credit takes a hit. Miss several and you're headed toward foreclosure.

Additionally, homes generate their own financial emergencies. A water heater fails ($800–$1,800). The HVAC system quits in July ($4,000–$8,000). The roof after a hail storm. Renters call the landlord. Homeowners write the check.

What "Emergency Fund" Means for Homeowners

The standard advice for most households is three to six months of living expenses in a liquid account (high-yield savings, money market). For a new homeowner, the bar is higher:

• 3–6 months of PITI payments as a minimum. This is your biggest fixed expense and the one you can't miss.
• Plus 1–2% of home value in a dedicated home repair reserve. On a $350,000 home, that's $3,500–$7,000. Keep this separate from your emergency fund. It's a maintenance reserve, and you should replenish it as you use it.

Together, an emergency fund and a maintenance reserve are what let a homeowner handle the unexpected without a financial crisis.

The Reserves Requirement: What Lenders Check

Beyond your down payment and closing costs, lenders may require you to show "reserves," meaning money remaining in your accounts after closing. Reserves are typically expressed in months of PITI. For a primary residence, lenders may require 2–6 months of reserves depending on the loan amount and program.

That minimum reserve requirement is a floor, not a target. Your actual reserve should be higher.

Where to Keep Your Emergency Fund

Keep it liquid and accessible. A high-yield savings account at a reputable bank or credit union is the right place. Don't put it in the stock market or lock it in a CD with early withdrawal penalties. The whole point of an emergency fund is that you can get to it when you need it. Yield is secondary.

A word about cash kept outside of a financial institution. Lenders will verify every dollar you're using for your down payment, closing costs, and reserves. They'll pull two months of bank statements and trace where the money came from. The goal is to confirm the funds are truly yours — saved over time — and not borrowed money that would add to your debt load. Cash kept at home, in a safe, or in a safe deposit box doesn't have that paper trail. Lenders call it "mattress money," and they typically won't count it. If you show up to closing with funds that can't be sourced and verified, you may not be approved. If you have cash sitting outside of a bank, deposit it into a financial institution at least 3 to 4 months before you plan to apply for a mortgage. That gives the funds time to season in your account and become verifiable. The earlier, the better.