One of the biggest fears of borrowers is that if they change financial institutions for their
Mortgage, they'll be penalized in some other way. Perhaps you have a business or personal credit line that you want to keep, but are unhappy with the mortgage rate/ options.
The reality is that mortgages at discounted rates are often loss leaders for other more profitable products. There's a good chance your current mortgage lender is only breaking even on the mortgage if he matches the mortgage rate offered, while making a profit on everything else. Your manager is still measured on his mortgage portfolio, however, and will likely try hard to persuade you to stay, as soon as the request for a "payout statement" comes in from your new chosen lender.
If a threat - subtle or otherwise - is made by your financial institution in response to your request, that's a pretty good cue to take all your business elsewhere. However, in this age of short-term mortgages you could remind your current lender that you intend to apply the other institution's mortgage services to the same criteria. When that reasonable premise is acknowledged and accepted by your current lender, you then become a good prospect to be won back. And in all cases, the best lender will win!
There may be a few situations in which you are truly "stuck" with your current lender, and you should be aware of this from the outset.