After you've added your property to Perch and entered your mortgage information Perch will automatically calculate your estimated "switch savings" for each of your outstanding mortgages or loan on a given property.

These switch savings are the estimated savings (or losses) you could expect if you were to switch from your current lender to a new lend through the Perch platform.
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You'll never have to worry if you've got the right mortgage because Perch constantly recalulating your amount of switch savings and will notify you via email any time your switch savings are greater than $5000.