Your LOC charges interest on the average daily balance.
When your paycheck deposits on day 1, it immediately reduces that balance.
As you spend throughout the month, it rises back — but every day it sat lower saved you interest.
This is the velocity effect: income parked in the LOC works for you every single day.
Monthly Interest Saved (parking)
$0
vs. keeping income in checking
Annual Parking Savings
$0
just from the velocity effect
Interest Without Velocity
$0
paying on full balance all month
Interest With Velocity
$0
with paycheck reducing balance