10/06/2026
The “Available Redraw” trap that catches weekly mortgage payers off guard.
If you pay your mortgage weekly or even fortnightly, you might be looking at a financial illusion every time you log in to your banking app.
Paying weekly or fortnightly is an excellent strategy but here’s how a smart habit can accidentally land a borrower in arrears:
Most banking systems operate on a strict monthly billing cycle. For example, if your required payment is $4,000 a month, the bank’s computer only “charges” that amount once a month on a specific date.
If you pay $1,000 a week:
- By week three, you’ve put $3,000 into the loan.
- Because the monthly due date hasn’t hit yet, the bank’s system often views that $3,000 as an “extra payment.”
- It tops up your “Available Redraw” balance to reflect it.
The Trap:
If you log in, see that balance, and withdraw all of your redraw for an emergency or a purchase, you haven’t just taken your savings.
You’ve inadvertently stripped out the weekly instalments meant to cover your upcoming monthly repayment.
When the monthly repayment due date arrives, the system looks for the $4,000, finds a shortfall, and automatically flags your account as in arrears.
The Fix:
Not all bank systems are created equal. Some modern lenders dynamically “hide” your current month’s weekly payments from your redraw to protect you while others don’t.
If you ever need to clear out your redraw balance, the safest rule of thumb is to always leave an amount equal to one full month’s repayment untouched.
Set that permanent buffer, and you’ll never let a timing mismatch mess with your credit file.