Automating the Sweep From Paycheck to Line of Credit

Paycheck parking runs on one move repeated forever: income lands on the line of credit, expenses come back off it, and the balance spends most of the month lower than it would have been. Do that for a year and the interest bill shrinks on its own. Miss it four months out of twelve and the math stops working.

So take yourself out of it. Most payroll systems let you split a direct deposit across accounts by dollar amount or percentage. If your line of credit is a HELOC that accepts ACH deposits, the whole check can go straight there. If it doesn't accept direct deposit, the check goes to checking and an automatic transfer moves it the same day, scheduled for the day after payday so a bank holiday doesn't bounce the order.

Some lines of credit won't take an external deposit at all, or they'll take it and hold it for days before it credits the balance. Call and ask two questions: does a payment post the day you send it, and does the interest calculation use the posted balance daily. If the answer to either one is no, you're doing the work without getting the benefit, and a different lender is the fix.

Then the spending side. Living expenses come back off the line of credit, either by writing from it directly or by paying a card from it once a month. Both work. What doesn't work is running the household from a checking account you keep topped up out of habit, because that money sitting in checking is doing nothing, and doing nothing is the thing this whole approach is designed to stop.

Set a floor and automate around it. Pick a minimum available balance you never go under, put it in writing, and size the sweep so a normal month never touches it. If your available room drops below the floor, the sweep pauses and the money stays in checking until the balance comes back up.

Watch out for the autopay that pulls from checking on the fifth of the month when the whole paycheck left on the first. Every recurring draft has to be inventoried and moved before you turn the sweep on. Insurance, the mortgage, the gym, the streaming stack, the kid's tuition. One overlooked draft creates an overdraft, and now you're paying $35 for the privilege of saving interest.

Give it ninety days before you judge it. The first month is setup, the second month is finding the drafts you missed, and by the third the statement should show a lower average balance than the month before. That number, not the payoff projection, is what tells you the sweep is running.