Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

At what interest rate should debt be used as a tool?
It's tough to borrow fixed and invest risk free. That said, there are still some interesting investment opportunities. A 4% loan will cost you 3% or less after tax, and the DVY (Dow high yielders) is at 3.36% but at a 15% favored rate, you net 2.76% if my math is right. So for .5%, you get the fruits of the potential rise in dividends as well as any cap gains. Is this failsafe? No. But I believe that long term, say 10 years or more, the risk is minimal.