should I do large down payment on house?

[fizzgig]

I have about 150K in index funds earning about 7% at the moment.
If I can find an affordable house around here, there are 15 yr mortgages at about 3% interest.
Does anyone think it would be worth putting 100K or more from my index funds down on a house? I would continue to add savings to the fund after the house is bought, about 20K a year, but the fund would take a big hit initially from buying a house.

[frugaliknowit]

Congrats on the Index Fund balances!

More information, please:

Age/how far from FIRE or retirement
Marital Status or Partner, if any, contributing
Household Income (just yourself?)
Other debts, if any
Other savings, if any
Cash balances, if any

[Mrtreasuretoupee]

I'd put enough down to avoid the PMI (around 20%) because the money is earning you more in the index fund that it will cost you in interest.

[fizzgig]

Hi,
I'm 40 years old, I don't really expect to retire early, just putting my savings in VTSAX, I just started doing that 2 years ago.
At the moment I have a partner splitting living costs with me. I make 57K a year.
No debt, an additional 30K or so in checking or savings

[neo von retorch]

Math says... leave your money invested. Put 20% to avoid PMI. Enjoy your low interest rate. (Even consider a 30-year despite the higher interest, since over the long-term, it lets you invest earlier with those smaller payments.)

[frugaliknowit]

I would put 20% down, 15 year amortization (in part due to the fact that you are 40) and invest the rest.