What to do with extra money from cash-out refinance

[Julie Dillon]

About a month from now, I'll close on our cash-out refinance and get 50K but only need about 40K to buy our first investment property (a duplex). I'm not sure what to do with the extra 10K. It's a waste to just put it in saving so... is it better to put it into the duplex (the 40K is the 20% down on a commercial loan at 5.25% 20 year) so I have even more equity or roll it back into our original property. What's more beneficial from a tax standpoint?

Thanks!