DisneySteve, as usual, I agree with you.
I am a mortgage broker, so I have this conversation with clients all the time!
Carrying a mortgage is not only a financial cost, but an emotional cost as well. For many years the mindset has been that you have to own your home. I have clients selling homes and using 100% of the equity for down payment on the next home so they can be mortgage free faster, but when I ask them about their RRSPs (Registered Retirement Savings Plan, a tax deductible investment in Canada) they don't have any! I always counsel them to make sure they look after the rest of their portofolio because "if life happens to you, and your are driving down the road and the transmission goes in your car, it's going to be tough to get the money you need for repairs from your equity...make sure you keep some money in liquid investments for emergencies". That is my standard phrase, but it drives home the point that there are other options than just paying off the house early.
In Canada, we are allowed to contribut a certain percentage of our income to RRSPs and that amount gets deducted dollar for dollar from our taxable income. If I earn $60K, and contribute $20K, then I am taxed on $40K. Most of us pay 30-40% tax, so that represents a mimimum tax refund of $300-$400 per $1000 of contribution. So, right away, by contributing to an RRSP we are effectively earning a 30% return, mimimum. Add to that the compounding interest of any half decent investment and there is a significant advantage to fully funding the RRSP.
I frequently recomment to my clients to take some of the equity from the sale of their home, top up their RRSP contributions (any unused contributions from previous years are added to the next year's limits. Some people have NEVER contributed, and might have $20K,$30K or even more that they could contribute all at once, if they have the resources to do so) and then use the substantial tax refund to make a lump sum payment on the principal of the mortgage. That way they have the best of both worlds...some retirement savings that could be accessed in an emergency AND a lower mortgage balance. It's a pretty easy sell when I point out the 30-40% tax refund they are going to get in the spring!
With our RRSPs, we pay tax on the money when it is withdrawn. The idea is that by the time you withdraw it you will be in a lower tax bracket than when you earned it so you will pay less tax, and you've had the benefit of compound interest for all those years as well.
We have a whole stategy for helping people access their equity. In Canada, we do not receive a tax break on our mortgage interest because we do not have to claim capital gains, on a principal residence, when we sell. Our profit is non taxable. HOWEVER, we do earn a tax break on the interest from loans taken out for the purpose of investing (as long as it is not invested in the tax sheltered RRSP). I have several clients taking secured credit lines or brand new mortgages for the sole purpose of investing, as then they have a tax break writing off the interest. Example: I had a client who was purchasing a new home, and he planned on having a mortgage of $200K. Upon discussion I discovered that he had enough in his liquid investments to pay for the house in full. We then did a "refinance" of the property about 2 weeks after closing and gave him his $200K mortgage, which he promptly used to re-fund the investments. He still has the same mortgage he was going to have, the difference is now the $900 in interest, that was just going to fly out the window every month, is now a tax write off. He will pay tax on the interest he earns in his investments (when he cashes them in) but in the meantime he can use his tax refund every year to either pay down his mortgage or make further investments. I got him a rate of 5.14% fixed for 5yrs so the interest he earns in the investments will far out pace what he would pay on the mortgage even if it wasn't a tax deduction!