This is a common question, and why tax deferred investments have been broadly utilized.  This common belief is why investments in tax-deferred accounts are promoted so widely. However, if tax brackets are higher in the future, those in retirement will likely have more of their money taxed at this higher rate. Plus, deductions are almost always fewer in retirement since children are most likely grown, there is little or no mortgage interest as a deduction, and often, time is given to charities vs. money donated. So, even if income is lower, deductions are gone. Either way, there is more evidence to suggest that tax rates will be higher – or at the very least NOT lower – in retirement.