Twenty percent down has been called outdated advice so many times that the pushback has become the conventional wisdom. And the pushback isn’t wrong: most buyers don’t put 20% down, the 20% figure isn’t a legal requirement, and waiting years to hit it while prices climb can cost more than it saves.
But “most people don’t” isn’t the same as “you shouldn’t.” Here in Monmouth and Ocean counties, where the median single-family price runs several hundred thousand dollars above the national one, the arithmetic behind 20% is more compelling than the national commentary suggests. Here’s the actual case — and, at the end, the honest version of when it doesn’t hold.
Start with the number that isn’t obvious
Take a $700,000 house, roughly where much of the Monmouth County single-family market has been sitting. Compare 10% down against 20%, at the 6.69% that the 30-year fixed averaged in early August.
| 10% down | 20% down | |
|---|---|---|
| Cash at closing | $70,000 | $140,000 |
| Loan amount | $630,000 | $560,000 |
| Principal & interest | $4,061/mo | $3,610/mo |
| PMI (est. 0.75%) | $394/mo | $0 |
| Monthly total | $4,455 | $3,610 |
The extra $70,000 of down payment buys an $845 reduction in the monthly payment. That’s the number worth sitting with. Not the interest rate, not the PMI percentage — $845 a month, every month, on the same house.
Over the full loan, the smaller balance saves roughly $92,000 in interest. And PMI at that level runs about $394 a month until you reach 80% loan-to-value, which through scheduled payments alone takes about eight years — around $38,000 in premiums for insurance that protects the lender, not you.
The Shore-specific argument: you’re competing for the same house
Inventory across Monmouth and Ocean has loosened somewhat but still sits well under what anyone would call balanced — months of supply in the low single digits against the five-to-six range that defines equilibrium. Well-priced homes in desirable towns still draw multiple offers.
In that environment, the down payment isn’t only a financing decision. It’s part of how your offer reads. A listing agent evaluating three offers is assessing which one closes. A 20%-down buyer clears appraisal gaps more easily, has more room to negotiate after inspection, and carries less financing risk on paper. That’s not a guaranteed win — price and terms still dominate — but it’s a real thumb on the scale in a market where the difference between winning and losing a house is often small.
The rate environment changed the calculus
Much of the “don’t bother with 20%” advice was written when rates were near 3%. At 3%, borrowing more is cheap and the argument for keeping cash invested is strong. At 6.7%, every additional dollar borrowed costs more than twice as much to carry.
The counterargument is that you’ll refinance when rates fall. That may happen. But rates have been stubborn — the 30-year has run in the mid-6s for much of this year and is currently higher than it was twelve months ago. Building a purchase around a refinance that hasn’t been scheduled is a plan with a dependency you don’t control.
Where the money usually comes from around here
Nationally, the median down payment for first-time buyers is about 10%; for repeat buyers it’s roughly 23%. That gap isn’t about discipline. It’s equity. Repeat buyers roll procedown paymenteds from a sale into the next purchase, which is why 20% is far more achievable for a move-up buyer than the general advice implies.
If you’ve owned a home in this area for eight or ten years, you are quite possibly sitting on the down payment already without having consciously saved a dollar of it. The question isn’t whether you can reach 20% — it’s whether you’ve run the net proceeds calculation to find out.
Now the honest part: when 20% is the wrong call
An agent who tells you 20% is always right is selling you something. It isn’t, and here’s when it isn’t.
When it drains your reserves. This is the big one. A $700,000 house comes with a roof, a boiler, and — near the water — flood insurance, elevation questions, and maintenance that inland houses don’t have. Arriving at closing with 20% down and $4,000 in the bank is a worse position than 10% down with a real emergency fund. Lenders want reserves for a reason.
When waiting costs more than PMI. If reaching 20% means three more years of saving while prices appreciate and you pay rent, the delay usually costs more than the insurance. PMI is temporary — federal law lets you request cancellation at 80% loan-to-value and requires automatic termination at 78%. It’s a toll, not a life sentence.
When the cash has a better job. High-interest debt beats a mortgage rate every time. So does an employer match you’re leaving on the table.
When you have better loan options. VA loans carry no mortgage insurance at all, which makes the 20% question mostly irrelevant for eligible veterans. And starting with tax year 2026, PMI premiums are deductible again as mortgage interest for filers who itemize, subject to income limits — worth raising with your tax preparer, because it shifts the after-tax math somewhat.
The actual conclusion
Twenty percent down is not a rule, and it’s not a moral test. It’s a purchase — you’re spending $70,000 to buy $845 a month and about $92,000 in long-run interest on a $700,000 home.
For a lot of buyers in this market, particularly move-up buyers with equity from a previous home, that’s a good trade at today’s rates. For a first-time buyer who’d have to empty every account to get there, it usually isn’t.
What matters is that you run it as a comparison rather than inheriting a rule of thumb from either direction. Ask a lender for side-by-side loan estimates at 10% and 20% on the price range you’re actually shopping. The difference will be a specific number, and the decision gets much easier once you’re looking at it.
Figures are illustrative and based on national averages and market conditions as of August 2026; PMI rates vary by credit score, loan type, and lender, and mortgage rates change daily. This is general information rather than financial advice — confirm the numbers for your situation with a licensed lender and, on the tax question, with a tax professional.
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