A purchase mortgage and a refinance mortgage go through the same underwriters, use the same forms, and often come from the same lender. The real difference is what you walk into the room holding: a property you don’t own yet, or equity you’ve already spent three years building.
That single distinction ripples through everything. The timeline, the paperwork, the pricing, and the way an underwriter reads your file all shift. Borrowers who blur the two together tend to get surprised at closing, or refinance into a loan that never earns back its own closing costs.
What a purchase mortgage demands from you
A purchase loan is a deadline loan. You have a contract with a closing date, a seller who wants certainty, and a rate lock ticking down. On a $450,000 house with 20% down, you’re financing $360,000. Closing costs typically land between 2% and 5% of the loan amount, so roughly $7,200 to $18,000, plus prepaid interest and the first escrow deposits for taxes and insurance.
Down payment is the gatekeeper
Cash is what separates buyers from spectators. Conventional loans can go as low as 3% down, FHA sits at 3.5%, and VA loans can hit zero. Each program prices risk differently, and the gap between them isn’t a rounding error. A borrower putting 5% down on a conventional loan usually pays mortgage insurance until they hit 20% equity, while an FHA loan carries premiums for the life of the loan in most cases. The difference between conventional and government-backed mortgages tends to show up in year seven, not year one, which is exactly when most people stop paying attention.
The appraisal decides whether the deal happens
On a purchase, a low appraisal is a negotiating event. You can renegotiate the price, bring extra cash, or walk. There’s a whole category of mortgage products built around that uncertainty, and the real cost of each mortgage type is worth understanding before you make an offer, not after.
What a refinance mortgage demands from you
Refinancing replaces an existing loan on a home you already own. There’s no down payment, no seller, no moving truck. Instead, the gatekeeper is equity. Conventional rate-and-term refinances typically cap you at 80% loan-to-value, and cash-out refinances usually land at the same ceiling. FHA cash-out tops out near 80% as well, with VA cash-out reaching higher for eligible veterans.
You’re also re-qualifying from scratch. Income, debts, credit score, employment history, all of it gets re-verified. A borrower who qualified comfortably in 2021 on a 3.1% loan may find that a job change to self-employment in 2023 makes the paperwork considerably uglier.
The appraisal is a math problem, not a negotiation
This is where the two loans diverge most sharply. On a refinance, a low appraisal doesn’t give you someone to negotiate with. If you need 80% LTV to avoid mortgage insurance and the appraisal comes in $15,000 short, you either bring cash to closing or the refinance dies. Nobody splits the difference with you.
The cost structures are not interchangeable
Purchase closing costs and refinance closing costs overlap in some places and split apart in others.
- Lender fees: origination, underwriting, processing. Often 0.5% to 1% of the loan amount on either loan type.
- Appraisal: $450 to $700 for a standard single-family home, sometimes waived on a refinance with an automated valuation model.
- Title work: a purchase needs a full lender’s policy plus owner’s title insurance. A refinance usually needs only a lender’s policy, and many title companies discount a repeat policy substantially.
- Recording and transfer taxes: purchases often carry transfer taxes. Refinances frequently don’t, depending on the state.
- Escrow setup: a purchase requires funding a new escrow account. A refinance often rolls the existing balance forward, so it’s closer to a wash.
Run the breakeven before you get attached to a lower rate. Divide total closing costs by monthly savings. On a $380,000 balance at 7.1%, principal and interest runs about $2,554. Refinancing to 6.25% drops that to roughly $2,339, a savings of $215 a month. With $5,600 in closing costs, you break even in about 26 months. If you’re selling in 18 months, that refinance is a $1,700 loss dressed up as a win.
Same day, different pricing
Lenders often price refinances slightly higher than purchases, usually by 0.125% to 0.25%, because refinance loans tend to be smaller and borrowers are more likely to shop and vanish. Cash-out refinances carry their own pricing hit on top of that. Investment properties are priced higher still, and the process for financing an investment property adds reserve requirements that a primary residence purchase doesn’t.
Fixed versus adjustable matters here too. A purchase borrower planning to stay 15 years is solving a different problem than a refinance borrower chasing a two-year window. The fixed versus adjustable decision is worth running with actual numbers rather than a gut feeling about where rates are headed.
The timing trap nobody warns you about
Purchases have external pressure built in. You close when the contract says you close. Refinances have no deadline at all, and that’s the problem. Without a forcing function, borrowers either sit on a good opportunity for 14 months waiting for rates to drop another eighth, or they pull the trigger the week after closing on a purchase because a mailer promised a lower payment.
Here’s the specific detail that catches people: refinancing within the first few months of a purchase can mean the lender’s credits get clawed back. If you took a lender credit at purchase in exchange for a higher rate, and you refinance before the recapture period ends, typically 36 months, that credit can be charged back at payoff. Read the promissory note before you assume a refinance is free money.
What to check before you sign either one
Ask your current servicer whether they offer a streamlined refinance with a waived appraisal; many do, and they don’t advertise it. Get Loan Estimates from at least three lenders on the same day, since rates move and comparisons across different days are meaningless. Confirm whether closing costs are being financed into the loan, because a $5,600 cost rolled into a $380,000 balance quietly becomes $6,000 of new debt at 6.25%.
If you’re refinancing to a fixed rate and plan to stay put, spend an hour with a walkthrough that runs the numbers properly, like this guide on choosing a fixed-rate mortgage. The steps overlap more than you’d expect between buying and refinancing.
And if you’re weighing a cash-out refinance against a HELOC or a home equity loan, remember that the refinance resets your entire mortgage balance at today’s rate. If your current first mortgage is at 3.4% and today’s rates are 6.5%, pulling out $50,000 by refinancing reprices all $380,000 of your debt. A second lien keeps the cheap money cheap. Run both scenarios side by side before you let a loan officer talk you into the simpler option.
The honest test for either loan is the same question: what does this cost me over the next 60 months, and what does it save? A purchase mortgage at a slightly worse rate that gets you into a home you’ll keep for a decade usually beats waiting. A refinance that trims $180 a month but costs $6,200 and resets your amortization to year one is a different animal entirely, and the calendar, not the rate, is what decides whether it works.