The OZ program does not make a bad investment good. It makes a good investment great. If the investment is not advisable to begin with, OZ will not make things any better. Tax credits are different - they CAN potentially make a bad deal good. But OZs will not turn a bad deal into a good one. Interest rates feed into the discussion about whether an investment is a good one; stress-test your projections and see what rising interest rates would do, because if it'll ruin the investment pre-tax, it'll ruin the investment post-tax.