20% down isn't magic — it's just PMI-free
PMI on a 10% down loan costs 0.5–1.5% of the loan per year. On a $400k home that's $200–500/month vanishing until you hit 20% equity.
If home prices grow 5% a year and your savings grow 4%, waiting to save 20% actually loses money vs buying at 10% down today.
First-time-buyer programs (FHA 3.5%, VA 0%, USDA 0%) can beat waiting five years. Run the numbers — waiting isn't always right.