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Retired, want to buy a mobile home; how to finance?
Do you think your 403b will earn more than the mortgage interest rate?  If so, then mortgage seems the way to go. Conservative investment strategies might not earn much more than a 3-4% mortgage, and if you're paying 5-6% it's more likely you'll be earning less than the mortgage. From another point of view, though, I would probably take a loan anyway just from a security standpoint - you have more risk if you put a third of your retirement savings into one purchase directly, whereas if you do a 10-15 year loan, you'll have more of a cushion.  Also, if you don't outlive the mortgage, you'll have had use of more of your retirement income than otherwise - though I do wonder if it puts you at some risk if you have significant medical bills (which might require you to liquidate your 403b but wouldn't require you to sell your house, so paying it off has some upside). Also, as @chili555 notes in comments, you should consider the taxation of your 403(b) income.  If you pull it out in one lump sum, some of it may be taxed at a higher rate than if you pulled it out more slowly over time, which will easily overwhelm any interest rate differences.  This assumes it's not a Roth 403(b) account; if it is Roth then it doesn't matter.