<prompt> Human: Im a first time home buyer and my wife and I just signed a contract to build our new house. Were just having a hard time deciding if we should go with a 15 year or 30 year fixed mortgage.Some information about our situation: House purchase price is 295k. We have the 20 down payment saved. My income is 125k and wifes income is 79K. We are both contributing the max amount of 17.5k to our 401k and we plan on doing that for the foreseeable future. Our employers offer the roth option and we may switch from traditional to roth 401ks in the future. I recently started to invest on my own with the help of reddit into Vanguard ETFs and funds. I know we can afford the monthly mortgage payment and that number will be between 30-35 of our take home monthly income. What Im struggling to decide is if we should go with a 30 year fixed and invest the difference in mortgage payments? or should we get the 15 year fixed and save on the interest? or go with 30 year fixed and pay it off as 15 with the benefit of having the safety net of lower payments if we ever need it.Would really appreciate any input.Assistant: What is the difference in interest rate? I believe with a 30 year you should be able to make the minimum payments on either salary. Combined you have a high salary to home price ratio. For that reason, I would suggest get the 30 and but aim to pay it off in less than 10 so long as you both keep your jobs.Human: I was quoted today 3.6 for 15 and 4.5 for 30.  <response>: That is a big difference. Using the 15 year note is definitely advantageous.Assuming a final loan amount of 236,000, the .9 rate drop will save you 19,197 over the course of the 15 year note, compared to a 30 year note that you pay off like a 15 year note 69,772 in interest on 15 year note and 88,969 in interest on 30 year note paid off like a 15 year.That is a significant savings and in my opinion, the flexibility that a 30 year note gives you isnt worth 20k. 