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Should I get a personal loan to pay on my mortgage to go “above water” to qualify for a refinance?
Let's say you owe $200K (since you didn't mention balance. If you do, I'd edit my response), and can get 4.5%. You'd save 1.5% or about $3K/yr the first few years. If a $12K paydown is all that's between you and and refi I'd figure out a way.  There are banks that are offering refi's under the HARP program if your current mortgage is owned by FNMA or FMAC which permit even if under water. So, the first step is research to see if you can refi exactly what's owed, failing that, shop around. A 401(k) loan will not appear as a loan on your credit report, that may be one way to raise the $12K. The best thing you can do is put all the savings into the 401(k) to really get it going.