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Buying a house, how much should my down payment be?
Mortgage qualification is typically done based on pretax income. To keep the math easy, let's assume $10K/month gross.  A well written loan allows 28% or $2800 to be used for the mortgage and property tax. Property tax varies, but 1% is the average of the 2 states mentioned. This results in $7500/yr property or $625/mo tax leaving $2175/mo. Note here - OP stated $750K house.  $2175 will finance $450K at 4%/30 years. $2175 will finance $300K at 3.5% /15years. Let me pause here. Facts are most important to make these decisions. Unless you're clear on gross income, which may be higher, the constraints above quickly come into play.  Once the numbers are spelled out, you may find that you are qualified to only borrow $350K based on a 30 year note. Nathan's $2500 payment was correct, but for the mortgage only. Add property tax and you'd be at $3125. You'd need a gross $11,160/mo. to meet the 28% rule.  The above discussion would render any further thoughts (of mine) moot.