First-Time Home Buyer Checklist: What to Calculate Before Making an Offer

The pre-offer checklist

• ☐True monthly cost calculated (not just mortgage)
• ☐Down payment amount confirmed (and PMI factored in if under 20%)
• ☐Closing costs budgeted (2–4% of purchase price, separate from down payment)
• ☐Price vs. Zestimate gap calculated
• ☐Days on market checked (and price history reviewed for relisting)
• ☐HOA fees confirmed and added to monthly cost
• ☐Property tax actual rate verified (not estimated)
• ☐Pre-approval letter obtained
• ☐Offer price range determined based on negotiation signals
• ☐Contingencies decided (inspection, financing, appraisal)

1. True monthly cost (the number that actually matters)

The mortgage payment is not your monthly cost. Your actual monthly cost includes:

• Principal and interest (P&I): The mortgage payment, based on loan amount, rate, and term
• Property tax: Use the actual tax figure from the listing, or estimate 1.0–1.5% annually depending on your state
• Homeowner's insurance: Typically 0.5–0.8% annually, or $100–$200/month on most homes
• HOA fees: Listed on the property page, often overlooked entirely
• PMI: Private mortgage insurance, required when your down payment is under 20%. Typically 0.5–1.2% of the loan amount annually
• Maintenance reserve: The industry standard is 1% of the home's value annually. On a $500,000 home, that's $417/month you should be setting aside for repairs

Add all six together. That's your monthly cost.

2. Down payment and PMI

The down payment directly affects three things: your monthly payment, whether you owe PMI, and how much equity you start with.

Under 20% down: You pay PMI, which adds 0.5–1.2% of the loan amount per year until you reach 20% equity. On a $540,000 loan (10% down on a $600,000 home), PMI at 0.8% is $360/month. That's not a small number.

Exactly 20% down: No PMI. Your monthly cost drops meaningfully. The tradeoff is a larger cash requirement upfront.

Under 10% down: Some lenders allow 3–5% down. Monthly cost increases significantly, and you're building equity more slowly in the early years when most of your payment goes to interest.

Run the numbers at 5%, 10%, and 20% down before you decide how much to put down. The optimal answer depends on your liquid savings, your emergency fund, and how long you plan to stay in the home.

3. Closing costs (the number most first-timers forget)

Closing costs are the fees you pay to complete the transaction, separate from your down payment. They're due at closing — meaning you need this cash on the same day you need your down payment. Budget 2–4% of the purchase price.

Typical closing cost breakdown on a $600,000 home:

• Loan origination fee: $1,500–$3,000
• Title insurance (lender + owner): $1,200–$2,500
• Escrow/settlement fee: $800–$1,500
• Appraisal: $500–$800
• Home inspection: $400–$600 (paid before closing)
• Prepaid interest: $400–$1,200 (depends on closing date)
• Property tax escrow (2–3 months): $1,100–$1,650
• Homeowner's insurance (first year): $900–$1,500
• Recording fees: $100–$300

Total: $6,900–$13,050 in this example. This is a cash requirement due at closing, in addition to your $60,000 down payment.

4. Price vs. Zestimate (your first negotiation signal)

Calculate: (List price − Zestimate) ÷ Zestimate × 100

This percentage tells you how the seller is priced relative to Zillow's automated valuation:

• 0–5% above: Fairly priced. Little negotiation room unless DOM is high.
• 5–15% above: Seller has priced in negotiation room. You have leverage if DOM is growing.
• 15%+ above: Seller is aggressive or believes the property has premium value Zillow doesn't capture. Find out why before bidding.
• Below Zestimate: Motivated seller, estate sale, or property issue. Investigate and potentially offer fast.

5. Days on market and price history

DOM is the most underused piece of information in a home purchase. Before you make an offer, answer these questions:

• How long has this listing been active?
• Has it been relisted (showing a lower DOM than the actual time on market)?
• Has the price been reduced? By how much? How many times?

Check the price history tab on every Zillow listing. A home that appeared at $750,000 four months ago, dropped to $725,000, then relisted at $710,000 and now shows "21 days on market" has actually been on the market for 4+ months. That's very different leverage than a fresh listing at 21 days.

6. Your pre-approval (the non-negotiable)

You cannot make a credible offer without a pre-approval letter from a lender. In competitive markets, sellers won't even entertain offers without one.

Pre-approval is not pre-qualification. Pre-qualification is a rough estimate based on self-reported income. Pre-approval is a conditional commitment from a lender based on verified income, assets, and credit — a document that tells the seller your financing is real.

Get pre-approved before you tour homes, not after you find one you love. The process takes 1–3 business days and requires: W-2s and/or tax returns, recent pay stubs, bank statements (2–3 months), and a hard credit pull.

7. Your offer range

Combine everything above to determine your offer range before you make the call:

• Maximum: The highest you'd pay and still be financially comfortable based on the true monthly cost calculation
• Opening offer: Determined by negotiation signals — how long it's been on market, the Zestimate gap, price history, and your agent's read on seller motivation
• Walk-away: Know this number before you start. It prevents emotional overpaying in the heat of a negotiation.