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20% Down vs 5% Down: Which Down Payment Strategy Wins?

Home Price

$500K

Monthly Rent

$2,200

Down Payment (20%)

$100K

Est. Break-Even

5 yrs

The 20% down vs 5% down question is really about opportunity cost. With 20% down on a $500K home, you put $100,000 in illiquid home equity. With 5% down ($25,000), you keep $75,000 liquid — but pay PMI (~$208/month on $475K loan) and have a higher mortgage payment.

The 5% down buyer pays ~$3,260/month (higher loan, plus PMI) vs ~$2,620/month with 20% down — a $640/month difference. If that $75,000 saved earns 7%/year in stocks, it grows to $147,000 in 10 years. Meanwhile, PMI costs $208/month until you hit 20% equity (roughly year 7 on normal amortization + 3.5% appreciation) — totaling ~$17,500 in PMI payments.

Net result: keeping $75,000 invested generates ~$72,000 more than PMI costs over 10 years ($147K growth - $75K principal - $17.5K PMI = ~$54K net advantage for 5% down). However, the 20% down buyer also invests any monthly payment difference — so the comparison is close. The 5% down path wins mathematically if you invest the saved down payment.

The non-financial factors matter too: 20% down gives you a lower monthly payment (easier cash flow), no PMI, stronger offers in competitive markets, and lower interest rate (typically). 5% down preserves liquidity for emergencies. Most financial planners suggest 20% down if you have it — not because it's mathematically optimal, but because it reduces risk and monthly stress.

Frequently Asked Questions

Should I put 20% down or invest the difference?expand_more
Mathematically, investing the difference often wins if your investments return 7%+ annually. But 20% down provides payment certainty, no PMI, lower rate, and stronger offers. The right answer depends on your risk tolerance, cash flow needs, and whether you'd actually invest the saved funds.
How long do you pay PMI with 5% down?expand_more
PMI typically stays until you reach 20% equity. On a $500K home with 5% down, normal amortization + 3.5% appreciation gets you to 20% equity in about 6–7 years. You can request cancellation when you reach 20% via payments; it automatically cancels at 22%. Refinancing can also eliminate PMI faster.
What interest rate difference is there between 5% and 20% down?expand_more
Lenders typically charge 0.25–0.5% more in rate for loans with less than 20% down (lower credit = higher risk). On a $500K home, a 0.375% rate difference costs ~$85/month more on the higher loan — adding to the cost of putting less down beyond just PMI.

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