Invest in RRSPs or Repay your Mortgage?

One of the most common questions asked by Canadian taxpayers is whether they should use their excess disposable income to invest in RRSPs or pay down their mortgage.  Since contributions to an RRSP are made on a tax free basis,  reduction in taxes payable can be substantial.  Conversely,  higher mortgage payments can result in significantly lower interest expense.  As such, there several factors to consider when deciding which option is better: