Buying your first home is one of the biggest financial decisions of your life. This guide covers credit score requirements, hidden costs, down payment options, how to get a better rate, and the 5 mistakes that kill first-time buyer applications.
Buying your first home is one of the biggest financial decisions of your life — and the mortgage process is the part most people understand the least. The bank approves you for a number, you find a house in that range, and then a dozen things happen that nobody warned you about. Some of them cost thousands of dollars.
This guide covers what the mortgage industry assumes you already know but doesn’t tell you — from what your credit score actually needs to be, to the hidden costs that first-time buyers consistently get blindsided by, to how to negotiate a better rate than the first one you’re offered.
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The bank will tell you the maximum they’ll lend you. That number is almost always more than you should borrow. Lenders calculate your maximum based on what you can repay — not what you can repay while also having a life, building savings, and handling the ongoing costs of homeownership.
The standard rule: your total housing payment (mortgage principal + interest + property taxes + insurance) should not exceed 28% of your gross monthly income. Your total debt payments (housing + car loans + student loans + credit cards) should stay under 36%. This is called the 28/36 rule and it’s used by most conventional lenders.
| Annual Income | Max Monthly Housing (28%) | Est. Home Price |
|---|---|---|
| $50,000 | $1,167 | ~$195,000 |
| $70,000 | $1,633 | ~$270,000 |
| $90,000 | $2,100 | ~$350,000 |
| $120,000 | $2,800 | ~$465,000 |
These are estimates at current rates. Use the CFPB’s mortgage rate explorer to calculate your specific payment based on real current rates in your area.
The short answer: it depends on the loan type. The common belief that you need a 750+ credit score to buy a home is wrong — but your score does directly affect your interest rate, which directly affects what you pay over 30 years.
| Loan Type | Minimum Credit Score | Minimum Down Payment |
|---|---|---|
| Conventional | 620 | 3–5% |
| FHA Loan | 580 (500 with 10% down) | 3.5% |
| VA Loan (veterans) | No official minimum (lenders typically 620+) | 0% |
| USDA Loan (rural) | 640 | 0% |
The difference between a 620 and a 740 score on a $300,000 mortgage can be 1.0–1.5% in interest rate — that’s roughly $50,000–$80,000 more in interest over 30 years. If your score is below 700, spending 6–12 months improving it before applying can save you more than almost any other financial move.
Not backed by the government. Best rates and terms for buyers with good credit (680+) and stable income. Requires private mortgage insurance (PMI) if your down payment is under 20% — PMI typically costs 0.5–1% of the loan amount annually until you reach 20% equity.
Backed by the Federal Housing Administration. More flexible qualification requirements — lower credit score minimums and higher allowable debt-to-income ratios. The catch: FHA loans require both an upfront mortgage insurance premium (1.75% of the loan) AND annual mortgage insurance that lasts the life of the loan on most FHA mortgages. For buyers with lower credit scores, it’s still often the best path in.
Available to eligible veterans, active-duty service members, and surviving spouses. No down payment required, no PMI, and often lower rates than conventional loans. If you qualify, this is almost always the best option available. Check eligibility at va.gov.
A fixed-rate mortgage keeps the same interest rate for the entire loan term. A adjustable-rate mortgage (ARM) starts lower but adjusts periodically after an initial fixed period. ARMs make sense if you’re confident you’ll sell or refinance within the initial fixed period — otherwise, the rate risk makes them dangerous for most first-time buyers.
The purchase price and monthly mortgage payment are what most buyers focus on. These are the costs that actually surprise them:
The 20% down payment myth persists despite being increasingly outdated. Many first-time buyers qualify for programs requiring far less.
Putting less than 20% down means paying PMI, but it also means you keep more cash liquid for emergencies and repairs — which matters a lot in the first year of homeownership. The right down payment amount depends on your specific situation.
Most buyers accept the first rate they’re offered. That’s a mistake — rates vary significantly between lenders for the same borrower profile.
The bottom line: buying your first home is more manageable than the process makes it seem — once you understand what’s actually happening at each step. The buyers who get burned are almost always the ones who moved too fast, accepted the first offer from their bank, and skipped the home inspection. Take your time, get multiple quotes, and don’t let anyone rush you.
Building the credit you need to qualify? Read: Your Credit Score Dropped — Here’s Exactly Why and How to Fix It.