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Invest in (say, index funds) vs spending all money on home?
Rules of thumb? Sure - Put down 20% to pay no PMI.  The mortgage payment (including property tax) should be no more than 28% of your gross monthly income.  These two rules will certainly put a cap on the home price. If you have more than the 20% to put down on the house you like, stop right here. Don't put more down and don't buy a bigger house. Set that money aside for long term investing (i.e. retirement savings) or your emergency fund. You can always make extra payments and shorten the length of the mortgage, you just can't easily get it back.  In my opinion, one is better off getting a home that's too small and paying the transaction costs to upsize 5-10 years later than to buy too big, and pay all the costs associated with the home for the time you are living there. The mortgage, property tax, maintenance, etc. The too-big house can really take it toll on your wallet.