A down payment is not the number
a buyer brings to closing.

A down payment is the part of a purchase price a buyer pays out of their own pocket instead of borrowing. If a house is bought with a mortgage, the loan covers the rest. That is the whole definition, and it gets described as a percentage, which is where the confusion starts.

The percentage is not the number a buyer needs. Cash to close is. That figure takes the down payment and adds the closing costs and the prepaid items on top, which is why the amount the title company asks for on closing day is larger than the number people have been saving toward. Prepaid items are the things funded ahead rather than owed later, and they typically include the first stretch of homeowners insurance and the taxes and insurance that go into an escrow account at settlement. What appears varies by deal, which is exactly why the estimate has to come from the lender working your file rather than from a rule of thumb.

The other thing worth knowing is that the size of the down payment changes more than the loan balance. It affects which program a buyer qualifies for, and common programs allow well under twenty percent, so twenty is a benchmark rather than a requirement. It affects the monthly payment, because a smaller balance carries a smaller payment at the same rate. And it affects whether mortgage insurance applies, which is its own line in the payment and follows its own rules about when it can come off. Putting less down is not a penalty; it is a different set of tradeoffs, and which one fits depends on numbers that are specific to the buyer.

In practice the sequence that works is to get pre-approved first and ask two questions while you are there. Ask what the down payment would be at the price range you are shopping, and ask for an estimate of cash to close at that same price. Two numbers, from the person who will actually write the loan. With those in hand, a search is grounded in what you can close on rather than what you can offer.

What to ask, and who answers it: your lender is the one who tells you the current minimums for each program, what mortgage insurance would cost on your file, and what cash to close comes to at a given price. Your agent can tell you what sellers in a particular South Jersey town have been seeing on offers and what matters there beyond the deposit. A licensed New Jersey attorney is who you ask about what a contract term means for you.