A collateral mortgage is a way of registering your mortgage on title. This type of registration is sometimes used by banks and credit unions. Monoline lenders, on the other hand, rarely register your mortgage as a collateral charge – which is an all-indebtedness charge that allows you to access the equity in the home over and above your mortgage, up to the total charge registered.

What this means is that you may be able to get a home equity line of credit and/or a readvanceable mortgage, or increase your mortgage without having to re-register a mortgage. This is a real benefit to you in some cases because re-registering your mortgage can cost up to a thousand dollars.

However, there are some negatives to having a collateral mortgage.

First and most glaring – because it is an “all indebtedness” mortgage – it brings into account all other debts held by that lender into an umbrella registered against your home. This means that your credit cards, car loans, or any related debt at your mortgage’s institution can be held against your home, even if you’re up to date with your mortgage payments.
Secondly, if you want to switch your mortgage over to a different lender, they may not accept the transfer of your specific collateral mortgage. This means you’ll need to pay additional fees to discharge the mortgage and register a new one.
And lastly, collateral mortgages make it more difficult to have flexibility to get a second mortgage, obtain a home equity line of credit from a different institution, or use a different financial instrument on your home. This is because your collateral mortgage is often registered for the whole amount of your property.
To recap, collateral mortgages give you the flexibility to combine multiple mortgage products under one umbrella mortgage product while tying you up with that one lender. While this type of mortgage can be a great tool when used correctly, it does have its drawbacks.

Courtesy of Eitan Pinsky, AMP – DLC Origin Mortgages