The number that actually matters is not the down payment
Most first-time buyers walk into this with one figure in their head: the down payment. It is the wrong anchor. The down payment is only one of four separate piles of money you need, and it is frequently not even the largest surprise. The four piles are cash to close, monthly carrying cost, immediate move-in expenses, and post-closing reserves. Miss any one of them and you end up house-poor in month three.
This guide walks through all four using a single running example: a 400,000 dollar house with 5 percent down on a 30-year fixed loan at 6.75 percent. Rates move constantly, so treat the rate as an illustration and plug your own quote into the mortgage payment calculator as you read.
Step 1: Find your real price ceiling before you tour anything
Lenders qualify you on debt-to-income ratio. The front-end ratio is your housing payment divided by gross monthly income. The back-end ratio adds every other monthly debt obligation: car loans, student loans, minimum credit card payments, child support. Conventional underwriting commonly tolerates a back-end ratio in the low-to-mid 40s, and some government-backed programs stretch higher with compensating factors like strong reserves or a high credit score. The exact thresholds vary by loan program, lender overlays, and automated underwriting findings.
Here is the trap: the maximum a lender approves is not the maximum you should spend. Underwriting does not know about your daycare bill, your dog, your travel habits, or the fact that your car is nine years old. Run your own ceiling with the home affordability calculator, then subtract. A useful discipline is to target a total housing payment near 28 percent of gross income and treat anything above 33 percent as a decision that needs a reason.
Check your debt-to-income ratio before you apply. If you are at 46 percent and a 400 dollar car payment has 11 months left, paying it off may do more for your approval than another 5,000 dollars of down payment.
Step 2: Understand the down payment tiers
There is no universal 20 percent requirement. What actually exists is a set of tiers, each with different consequences:
- 3 percent conventional. Available on some first-time-buyer programs with income limits. Highest mortgage insurance cost.
- 3.5 percent FHA. More forgiving on credit score and DTI. Carries an upfront mortgage insurance premium plus an annual premium that, on most current FHA loans, stays for the life of the loan unless you refinance out.
- 5 to 15 percent conventional. The most common real-world zone. Private mortgage insurance applies but is cancellable.
- 20 percent. No mortgage insurance, best pricing, and a smaller loan.
- Zero down. VA loans for eligible service members and veterans, and USDA loans in designated rural areas.
On our 400,000 dollar house, 5 percent down is 20,000 dollars and the loan is 380,000 dollars.
Step 3: Build the monthly payment from the ground up
The four standard components are principal, interest, taxes, and insurance, usually abbreviated PITI. Mortgage insurance and HOA dues bolt on top.
| Component | Basis | Monthly |
|---|---|---|
| Principal and interest | 380,000 at 6.75 percent, 30 years | 2,465 |
| Property tax | 1.1 percent of value per year | 367 |
| Homeowners insurance | 1,800 per year | 150 |
| PMI | 0.5 percent of loan per year | 158 |
| Total | 3,140 |
Two of those lines deserve attention. Property tax rates vary enormously by state and even by school district inside the same county, ranging from well under 1 percent to well over 2 percent of assessed value. In a high-tax jurisdiction, the tax line on this same house could be 700 dollars a month instead of 367, which is the difference between comfortable and stretched. Get the actual tax bill for the specific parcel, not a county average, and ask whether the assessment resets on sale.
PMI is the other variable. Premiums are priced off your credit score and loan-to-value ratio, and the spread is wide. A borrower at 780 with 10 percent down might pay a small fraction of what a borrower at 660 with 3 percent down pays. Run your own numbers in the PMI calculator and note that on conventional loans you can request cancellation once the balance reaches 80 percent of original value, with automatic termination required at 78 percent under federal rules.
Step 4: Cash to close, itemized
Closing costs generally run 2 to 5 percent of the loan amount, and the composition matters because some items are negotiable and some are not.
| Item | Typical range on a 380,000 loan | Negotiable? |
|---|---|---|
| Loan origination and points | 0 to 3,800 | Yes, shop lenders |
| Appraisal | 500 to 900 | No |
| Credit report, flood cert, misc lender fees | 150 to 500 | Rarely |
| Title insurance and settlement fees | 1,500 to 4,000 | Sometimes, varies by state |
| Recording and transfer taxes | 200 to 6,000 | No, set by government |
| Prepaid interest | 0 to 2,100 | Depends on closing date |
| Escrow reserves for tax and insurance | 1,500 to 4,500 | No |
| Home inspection | 400 to 800 | Optional but do it |
Call it 12,000 dollars for our example, plus roughly 3,000 dollars in escrow setup. Add the 20,000 dollar down payment and cash to close is about 35,000 dollars. The closing cost calculator lets you sanity-check a lender estimate line by line.
A timing trick worth knowing: prepaid interest covers the days from closing to the end of the month. Closing on the 28th instead of the 3rd cuts that line to almost nothing. It does not save you money in the long run, since your first payment simply arrives sooner, but it reduces the cash you need at the table.
Step 5: The two piles nobody budgets for
Move-in costs. Utility deposits, a locksmith, window coverings for every window, a lawnmower, a refrigerator if the seller took theirs, and the near-certain discovery that your apartment furniture does not fill a house. Two to five thousand dollars is a realistic first-month figure, and that is before any paint.
Reserves. Some loan programs require you to document a couple of months of payments in the bank after closing. Even when not required, you want them. A water heater fails at 1,200 to 2,500 dollars installed. An HVAC condenser is several thousand. The general planning rule is that maintenance and replacement average roughly 1 percent of the home value per year over the long run, which is 4,000 dollars annually here, arriving in lumpy, inconvenient chunks. Keep that money liquid and separate. If you do not have a cushion yet, the emergency fund calculator will tell you how many months you are actually covered for.
Step 6: The transaction, in order
- Pull your credit and fix it first. Rate tiers on conventional loans step in 20-point increments. Moving from 719 to 720 can change your pricing meaningfully. Do this three to six months out.
- Get a real preapproval. Not a prequalification. A preapproval means a human or an automated system reviewed income documents and pulled credit.
- Shop at least three lenders in the same two-week window. Credit scoring models treat multiple mortgage inquiries in a short window as a single event. Compare Loan Estimates on page 2, section A, not the advertised rate.
- Offer, earnest money, contract. Earnest money is typically 1 to 3 percent, held in escrow and credited to you at closing. It is refundable only if you exit through a contingency before its deadline.
- Inspection and appraisal. The inspection protects you. The appraisal protects the lender. If the appraisal comes in low, you renegotiate, bring cash, or walk.
- Underwriting. Do not open a credit card, finance furniture, change jobs, or move large sums between accounts. Lenders re-pull credit days before closing.
- Closing Disclosure, three days before closing. Compare it line by line against your Loan Estimate. Certain fees are legally restricted from increasing.
Common first-timer mistakes
Shopping by monthly payment. A payment can be lowered by extending the term, adding points, or a temporary rate buydown that expires. Compare the loan amount, the rate, the term, and the total cost.
Assuming the rate is permanent. It is not. If rates fall meaningfully you can refinance, though it costs money to do so. Run the numbers through a refinance calculator rather than assuming a lower rate is automatically worth it.
Skipping the inspection to win a bidding war. In a heated market this feels necessary. A middle path is an information-only inspection with a short window and no repair requests, which at least tells you what you are buying.
Draining every account for a bigger down payment. Going from 10 percent down to 15 percent down saves maybe 60 dollars a month in PMI. Having 15,000 dollars in the bank when the sewer line backs up is worth more.
Buy the house you can carry comfortably at your current income, not the one that works only if the raise comes through. The math is unforgiving in one direction and very forgiving in the other.