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Is it possible to make money by getting a mortgage?
The likely reason the mortgage is "tricky to get" is the adviser is probably recommending an interest-only mortgage in which there is no repayment of principle before maturity.  That would allow you to deduct the amount of the interest expense from your taxable income.  Your investment grows compound tax deferred and the principal invested (the mortgage balance) is completely tax free since it never qualifies as income for tax purposes. Example ideal scenario: Refinance $100,000 on a 5/1 ARM-interest only at 3%.  Invest the $100,000 at 6%.  Each year you effectively pay taxes on only the gains greater than interest.  If you reinvest the profits it looks something like: Net Profit:    $12,309 Effective Tax Rate:  13.21%