Editorial note: the first-person examples below are illustrative scenarios built from common real-world situations, used to show the arithmetic step by step. They are not a claim about the author's personal financial history.
Start With the Number, Not the Listing
The most expensive mistake first-time buyers make is falling in love with a house before running the numbers. The monthly payment on a listing site is not your monthly cost — it excludes property tax, homeowners insurance, mortgage insurance, HOA dues, and maintenance. On a $340,000 house, those add roughly $600 a month on top of principal and interest.
This guide works through the actual arithmetic: what you need down, what the loan really costs, what the closing statement hides, and how to tell whether buying beats renting where you live.
Down Payment: What Each Loan Type Actually Requires
| Loan type | Minimum down | Notes |
|---|---|---|
| Conventional (97% LTV) | 3% | First-time buyer programs; PMI applies |
| Conventional (80% LTV) | 20% | No PMI; the traditional benchmark |
| FHA | 3.5% | 580+ credit score; 500–579 requires 10% |
| VA | 0% | Eligible veterans, active duty, surviving spouses; VA funding fee applies |
| USDA | 0% | Eligible rural areas; income limits apply |
The 20% rule is a convention, not a requirement. What 20% buys you is the absence of private mortgage insurance — typically 0.3–1.5% of the loan amount per year. On a $306,000 loan, that is roughly $115–$380 a month, which is real but not the catastrophe the internet implies.
PMI is also not permanent. Under the Homeowners Protection Act you can generally request cancellation at 80% loan-to-value based on the original value, and the servicer must terminate it automatically at 78%. If home values rise, an appraisal can get you there faster.
The Actual Monthly Cost of a $340,000 House
Assume 10% down, a $306,000 loan at 6.3%, a 30-year fixed rate, and a 1.1% property tax rate:
| Line item | Monthly |
|---|---|
| Principal and interest | $1,894 |
| Property tax | $312 |
| Homeowners insurance | $120 |
| PMI (0.55% annually) | $140 |
| HOA | $0 |
| Total | $2,466 |
| Maintenance reserve (1%/yr) | $283 |
| True monthly cost | $2,749 |
That last line is the one people skip. A house is not a subscription; the roof, the water heater, and the HVAC are on a schedule you do not control. Budgeting 1% of the purchase price per year for maintenance is not pessimism, it is the historical average.
The Costs at Closing
Closing costs typically run 2–5% of the purchase price, and they are due on a date you cannot move. On a $340,000 purchase that is roughly $7,000–$17,000, on top of the down payment. The line items that surprise people:
- Lender fees — origination, underwriting, points
- Third-party fees — appraisal ($500–$800), title search and insurance, flood certification
- Prepaids — homeowners insurance for the first year, property tax escrow (often two to six months)
- Recording and transfer taxes — varies enormously by state and county
By law you receive a Loan Estimate within three business days of applying, and a Closing Disclosure at least three business days before closing. Compare the two line by line. A “processing fee” that appears on the closing disclosure but not the loan estimate is a question worth asking before you sign.
How Lenders Decide: DTI and Credit
Two numbers drive approval more than anything else.
Debt-to-income (DTI). Add up all monthly debt payments — the proposed mortgage, car loans, student loans, minimum card payments — and divide by gross monthly income. Most qualified mortgages cap DTI at 43%, though some lenders approve to 50% with compensating factors. Underwriters also look at the front-end ratio: housing costs alone should generally stay under 28–31% of gross income.
Credit score. Conventional loans generally require 620; FHA allows 580 for 3.5% down. Score affects the rate, and the rate affects everything. On a $306,000 loan, the difference between a 6.1% and 7.1% rate is about $205 a month — roughly $74,000 over the life of the loan. If your score is within 6–12 months of a threshold, waiting can be worth more than any negotiation. Our credit score guide covers the specific levers, starting with utilization.
Pre-Qualification vs. Pre-Approval
A pre-qualification is a conversation. A pre-approval is an underwriter reviewing your documents and committing to lend up to a number, subject to the property appraising and your finances not changing.
Sellers treat them differently. In a competitive market, an offer with a pre-qualification letter loses to an offer with a pre-approval almost every time. Get pre-approved before you start touring, and do not open new credit, change jobs, or move money between accounts during the process — underwriters re-pull credit before closing.
Rent vs. Buy: The Break-Even
Buying has friction at both ends: 2–5% to get in, and roughly 6–8% to get out (agent commissions and seller closing costs). On a $340,000 house, that is roughly $30,000 of round-trip cost before you have gained a dollar of equity.
The monthly comparison also flips depending on what you count. A $1,750 rent versus a $2,466 mortgage payment looks like buying costs $716 more — but about $300 of that mortgage payment is principal, which is yours, and the tax deduction may offset some interest if you itemize. Against that, maintenance and the opportunity cost of the down payment cut the other way.
A reasonable rule: buy if you expect to stay at least five to seven years, and rent if you expect to move sooner. The break-even calculation is sensitive to appreciation, which is local and unknowable — which is exactly why the time horizon matters more than the forecast.
The Order of Operations
- Pull your credit reports at AnnualCreditReport.com and dispute errors. This takes 30–60 days to reflect.
- Talk to a HUD-approved housing counselor — free or low-cost, and required for many down payment assistance programs.
- Save the full cash requirement, not just the down payment: closing costs plus three to six months of reserves. Lenders want to see reserves; more importantly, you will need them.
- Get pre-approved with at least two lenders and compare the Loan Estimate, not the rate quote.
- Shop for insurance before you make an offer. In disaster-prone areas, the insurance quote can kill a deal, not the mortgage.
- Budget for the first-year surprises: blinds, a washer, a lawn mower, a plumbing repair in month three.
What I Got Wrong
I bought my first house at 29 with 5% down and a plan to refinance out of PMI within two years. What I did not budget for was the $6,400 in closing costs that arrived two weeks after I had drained my savings for the down payment, which I covered with a credit card. I paid that card off over eleven months at 19% APR — about $620 in interest for the privilege of not waiting.
The second mistake was smaller and more instructive: I did not compare two Loan Estimates, so I never noticed the $1,150 origination fee was negotiable. A competing lender quoted $450 for the same loan. One phone call would have paid for itself several times over, and this is precisely the kind of thing our debt payoff guide exists to prevent — high-interest debt taken on for a one-time cash-flow gap.
The house itself was fine. The financing was where the money leaked.
The First 90 Days in the House
Closing is the beginning of the expenses, not the end. The first three months reliably produce a set of costs that no closing disclosure mentions, and the households that budget for them are the ones who do not put a water heater on a credit card in month two.
Before you move a box: change the locks ($150–$300), locate the main water shutoff and the electrical panel, test every smoke and carbon monoxide detector, and find out when the HVAC filter was last changed. Register the utilities in your name for the day of closing, not the day after — a shutoff and reconnection fee is avoidable.
The predictable first-quarter purchases: a lawn mower and garden hose if there is a yard ($300–$600), window coverings for any window without blinds ($400–$1,500 for a whole house), a washer and dryer if they did not convey ($1,200–$2,500), and a basic tool kit, plunger, and fire extinguisher ($150). Add a $500 contingency for the thing that breaks in week three, because something does.
The inspection report is a to-do list, not a verdict. Items flagged as “monitor” or “budget for replacement” tell you the maintenance schedule: a water heater at year nine of a ten-year life, a roof at 18 years, an HVAC at 15. Put those on a calendar with estimated costs and start a sinking fund for the nearest one. Our emergency fund guide explains the sinking-fund mechanics.
File the paperwork that protects the deduction. Your Closing Disclosure, the mortgage interest statement (Form 1098), and property tax bills are what support the deductions if you itemize. Keep them with the deed. And check whether your county offers a homestead exemption — most do, most require an application, and almost nobody tells new owners about the deadline.
Reassess the emergency fund. The number that was three months of expenses in a rental is not three months of expenses in a house. A roof, a furnace, and a sewer line can each exceed a month of income. Aim for the larger of six months of expenses or 2% of the home’s value, held in cash and not invested.
The Bottom Line
Decide your budget from the full monthly cost — including tax, insurance, PMI, HOA, and maintenance — not from the list price or the lender’s maximum approval. Get pre-approved with two lenders, read the Loan Estimate line by line, and assume you will stay at least five years before buying. The down payment is the number everyone talks about, but the rate, the closing costs, and the maintenance reserve are where first-time buyers actually lose money.
Sources & References
- Consumer Financial Protection Bureau — Owning a Home — Loan Estimate, Closing Disclosure, and shopping for a mortgage
- CFPB — What is private mortgage insurance? — PMI cancellation and termination rules
- HUD — Find a HUD-approved housing counselor — free and low-cost homebuyer counseling
- Fannie Mae — HomeReady and 3% down options — conventional low-down-payment programs
- IRS Publication 936 — Home Mortgage Interest Deduction — the mortgage interest rules and the $750,000 acquisition debt limit
- FHFA — Conforming Loan Limits — the annual loan limit that determines conventional eligibility