To pay off mortgage or not. Say I've a mortgage for $100K @ 5.8% APR.?

This means, every year, I pay $5,800 per year in mortgage interest. Uncle SAM will allow a 30% tax deduction on this so opportunity lost is = .70 * $5,800 = $4,060. Does this mean that I should find an investment with 4.6% APR to break even. I just need help in validating my calculations or am I missing... show more This means, every year, I pay $5,800 per year in mortgage interest. Uncle SAM will allow a 30% tax deduction on this so opportunity lost is = .70 * $5,800 = $4,060. Does this mean that I should find an investment with 4.6% APR to break even.

I just need help in validating my calculations or am I missing something. Thanks!
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