Should You Put 20% Down? Not Always.

The 20% down rule is one of the most widely repeated pieces of home buying advice — and one of the most misunderstood. It has a real logic behind it: avoiding mortgage insurance, reducing your loan balance, and entering the transaction with meaningful equity. But it isn't the universal right answer. For many buyers, putting 20% down is the most expensive decision they make.

What 20% Down Actually Does

On a conventional loan, a 20% down payment eliminates the need for private mortgage insurance (PMI), which typically runs between 0.5% and 1.5% of the loan amount annually. It also reduces the loan balance, which lowers your monthly payment and the total interest paid over the life of the loan. These are real benefits — but they come at a cost: a significant reduction in your liquid capital.

The Opportunity Cost of Tying Up Capital

Money placed into a down payment is no longer available for anything else. For buyers who are stretching to reach 20%, that can mean depleted emergency funds, no budget for immediate repairs or renovations, and reduced financial flexibility in the months after closing. The question isn't whether 20% down is better in isolation — it's whether it's better given everything else competing for that capital.

Comparing Down Payment Options

• 3–5% down: Maximizes liquidity, carries PMI, higher monthly payment. Can make sense when preserving capital is the priority.
• 10% down: A middle path — reduces PMI cost and loan size while retaining meaningful reserves.
• 15% down: Gets closer to eliminating PMI while preserving some flexibility.
• 20% down: Eliminates PMI and secures the most competitive pricing. Best when capital is not constrained.
• Above 20%: Reduces loan size further and may improve pricing on jumbo loans, but diminishing returns on liquidity tradeoff.

When 20% Down Makes Clear Sense

If you have the capital available, strong reserves that won't be depleted, no immediate renovation needs, and no competing investment priorities, 20% down is a sound choice. It simplifies the loan, eliminates ongoing PMI costs, and reduces long-term interest. The decision is straightforward when capital is not the constraint.

When a Smaller Down Payment May Be Smarter

If reaching 20% would leave you with little reserve, forgo a needed renovation, or require passing on a more productive use of capital, a smaller down payment may serve you better — even accounting for PMI. The cost of PMI, while real, is often lower than the cost of financial stress or missed opportunity.

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The best down payment is the one that gets you into the right home, keeps you financially stable, and leaves you positioned to manage what comes next. That number is different for everyone.

Jennifer Ko, Founder of Koast Capital