Mortgages & Home Loans

How Much House Can You Actually Afford?

Before you start browsing listings, the most important number to know is your real purchasing budget — not just what a lender will approve you for, but what you can comfortably sustain month after month without financial stress. These two numbers are often very different.

The 28/36 Rule

Lenders use guidelines called the 28/36 rule to evaluate whether a mortgage is affordable for a borrower. The first number means your total housing payment — principal, interest, taxes, and insurance (PITI) — should not exceed 28% of your gross monthly income. The second means all of your debt payments combined (mortgage plus car payments, student loans, credit cards) should not exceed 36% of gross monthly income.

These are lender guidelines, not absolute rules — and being approved for a loan at the top of these ratios doesn't mean it's wise to take it. Many financial planners suggest being more conservative: targeting a housing payment closer to 25% of take-home pay rather than 28% of gross income, which leaves more room for savings, emergencies, and life changes.

The True Cost of Homeownership

Your mortgage payment is only part of what you'll pay each month. Before setting your budget, factor in all of the following:

• Property taxes — typically 0.5%–2.5% of home value annually, depending on location. In high-tax states like New Jersey or Illinois, this alone can add $1,000+ per month on a median-priced home.
• Homeowner's insurance — typically $1,000–$3,000/year, more in disaster-prone areas.
• PMI (Private Mortgage Insurance) — required if your down payment is under 20%, typically costing 0.5%–1.5% of the loan amount annually.
• HOA fees — can range from $100 to over $1,000/month in some communities.
• Maintenance and repairs — a commonly used rule of thumb is budgeting 1% of the home's value per year for maintenance. On a $400,000 home, that's $4,000 annually.
• Utilities — often higher than in a rental, especially in older homes.

What Lenders Actually Look At

Mortgage approval comes down to five factors that lenders evaluate together — often called "the five Cs of credit." Understanding each one helps you know where you stand and what to improve before applying.

Credit Score

Your credit score is the single most impactful factor in both your approval odds and the interest rate you'll receive. The difference between a 620 and a 760 credit score on a $400,000 mortgage can easily be 1.5–2 percentage points — which translates to $350–$450 more per month and over $100,000 more in total interest over 30 years.

Down Payment

Conventional loans typically require a minimum 3–5% down payment, though putting down less than 20% triggers PMI. FHA loans allow as little as 3.5% down with a 580+ credit score. VA loans (for eligible veterans) and USDA loans (for rural properties) require no down payment at all.

A larger down payment accomplishes three things simultaneously: it reduces your monthly payment, eliminates or reduces PMI costs, and signals financial stability to lenders — often resulting in a better rate.

Debt-to-Income Ratio (DTI)

Lenders calculate two DTI ratios. The front-end ratio is your projected housing payment divided by gross monthly income — ideally below 28%. The back-end ratio includes all monthly debt obligations and should be below 36% for conventional loans (though many lenders will approve up to 43–50% with compensating factors like a high credit score or large down payment).

Employment and Income History

Most lenders want to see at least two years of stable employment history. Self-employed borrowers typically need two years of tax returns showing consistent income. Lenders are skeptical of large income increases that happened very recently — they want to see that your earnings are sustainable.

Assets and Reserves

Beyond the down payment, lenders want to see that you have cash reserves — typically 2–6 months of mortgage payments — left over after closing. This demonstrates that you won't be immediately underwater if your income is disrupted.

Fixed Rate vs. Adjustable Rate — Which Is Right for You?

The choice between a fixed-rate and adjustable-rate mortgage is one of the most consequential decisions in the homebuying process. There's no universally correct answer — it depends on how long you plan to stay in the home, your risk tolerance, and what's happening with interest rates.

Fixed-Rate Mortgages

With a fixed-rate mortgage, your interest rate — and therefore your principal and interest payment — never changes for the life of the loan. This predictability has significant value. You can budget with confidence for 15 or 30 years, and if rates rise after you close, you're protected. Fixed rates are typically slightly higher than the initial rate on an ARM, but that premium buys you certainty.

Adjustable-Rate Mortgages (ARMs)

An ARM offers a lower fixed rate for an initial period (typically 3, 5, 7, or 10 years) and then adjusts annually based on a market index. A 5/1 ARM has a fixed rate for 5 years, then adjusts once per year. If you sell or refinance before the adjustment period begins, you've benefited from the lower initial rate with no downside. If you stay and rates have risen, your payment increases — potentially significantly.

15-Year vs. 30-Year Mortgage — The Real Math

The choice of loan term affects every dimension of your mortgage — the monthly payment, the total interest paid, the rate you receive, and how quickly you build equity. The difference is dramatic and worth understanding in detail before you choose.

On a $400,000 loan, here's what a typical rate difference looks like (using approximate rates where 15-year loans typically carry a 0.5–0.75% lower rate):

The 15-year mortgage costs $794 more per month but saves over $336,000 in interest — plus you own the home outright 15 years sooner. Whether that trade-off makes sense depends entirely on your cash flow and what else you'd do with that $794/month.

When Does Refinancing Make Sense?

Refinancing replaces your existing mortgage with a new loan — typically to get a lower interest rate, change the loan term, or access home equity. It's one of the most powerful tools a homeowner has, but it comes with upfront costs that take time to recoup.

The Break-Even Calculation

Refinancing typically costs 2–5% of the loan amount in closing costs. To determine whether it's worth it, calculate your break-even point: divide the total closing costs by your monthly payment savings. If you save $250/month and closing costs are $6,000, your break-even is 24 months. If you plan to stay in the home longer than that, refinancing makes financial sense.

Rate-and-Term Refinance

The most common type — you refinance to get a lower rate, a shorter term, or both. As a general rule of thumb, refinancing makes clear financial sense if you can reduce your rate by at least 0.75%–1% and you plan to stay in the home long enough to recoup closing costs. But even a 0.5% reduction can be worthwhile on a large loan balance.

Cash-Out Refinance

You borrow more than your current balance and take the difference as cash. This can be smart for high-return uses like home improvement that increases property value, or for consolidating high-interest debt. It's risky if used for consumption spending — you're converting unsecured debt into debt secured by your home, and extending your payoff timeline.

When Not to Refinance

• You're close to paying off your current mortgage — refinancing resets the amortization clock, meaning early payments go mostly to interest again.
• You plan to move before the break-even point.
• Your credit score has declined since your original loan — you may not qualify for a better rate.
• Closing costs would consume the savings before you recoup them.

The Homebuying Process — Step by Step

For first-time buyers especially, the mortgage process can feel opaque. Here's what actually happens from the moment you decide to buy to the day you close.

1. 1

   Check your finances and credit

   Pull your credit reports, calculate your DTI, and determine how much you can afford. Fix any errors on your credit report — this process takes time, so start 6–12 months before you plan to buy if your score needs work.

2. 2

   Get pre-approved — not just pre-qualified

   Pre-qualification is a quick estimate based on self-reported data. Pre-approval involves submitting actual financial documents and a hard credit pull, resulting in a conditional commitment from the lender. Sellers take pre-approval seriously; pre-qualification much less so.

3. 3

   Shop at least three lenders

   Rate differences between lenders on the same day can be 0.25%–0.75%. On a $400,000 loan, 0.5% is worth approximately $133/month. Multiple hard inquiries for mortgage purposes within a 14–45 day window typically count as a single inquiry on your credit score.

4. 4

   Make an offer and go under contract

   Your agent submits an offer including your pre-approval letter. Once accepted, you enter the contract period — typically 30–60 days — during which your loan is finalized and inspections are completed.

5. 5

   Loan processing and underwriting

   Your lender verifies all documents, orders an appraisal, and an underwriter formally approves or denies the loan. Avoid major financial changes during this period — don't open new credit accounts, change jobs, or make large purchases.

6. 6

   Closing

   You sign the final loan documents, pay closing costs (typically 2–5% of the loan), and receive the keys. Review the Closing Disclosure — which you receive at least 3 business days before closing — carefully to verify all numbers match what was quoted.

Frequently Asked Questions