Calculator
Payday Super Impact Calculator
Calculate the compounding interest savings of weekly or fortnightly super contributions versus quarterly payments.
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Analyse the cash flow and working capital interest impact of the July 1, 2026 'Payday Super' changes on your business. Determine remittance requirements per cycle and model the interest cost of losing quarterly super cash holding, then price the real deterrent: the Superannuation Guarantee Charge with daily-compounding interest and an uplift of up to 60% waiting for any contribution that misses the 7-business-day window.
Employer compliance with payday super
The transition to Payday Super requires employers to pay super contributions on the same day salary and wages are paid. Contributions must land in the employee's chosen super fund within 7 business days of payday. Failure to do so triggers the Superannuation Guarantee Charge (SGC), including interest and administrative penalties.
Cash flow and working capital impacts
Previously, businesses could hold super guarantee amounts in their bank accounts for up to 118 days (the quarter duration plus the 28-day grace period). Under Payday Super, this float is eliminated. Employers must plan cash flows to support higher-frequency super payments and account for the minor loss of working capital interest or yields on held funds.
Getting payroll ready, and keeping it ready
The employers who sail through payday super are the ones who treat the super file as part of the pay run, not a separate monthly chore. That means one operational change and three habits. The change: schedule the SuperStream file to transmit the same day wages are paid, so ordinary clearing-house and fund-processing friction burns buffer days the business can afford. The habits: reconcile fund RECEIPTS (not just payments sent) weekly, because the deadline is satisfied only when money lands in the member's account; fix bounced contributions within 48 hours, since one wrong member number can push a whole line past the 7-day window; and re-validate employee fund details at every onboarding and fund switch. Small employers using their payroll software's integrated super clearing generally inherit compliant timing automatically, the risk concentrates in manual processes and stale employee data, both of which are cheap to fix in July and expensive to discover in an SGC assessment letter.
What the numbers actually mean for you
Why the ATO made lateness irrational
Under the old quarterly regime, using employee super as short-term working capital was a bet many struggling businesses quietly made. Payday super re-prices that bet to absurdity: daily-compounding GIC, an uplift reaching 60%, and no tax deductibility on any of it. A business borrowing $10,000 from its super obligations for a few months now pays an effective rate that no bank, and frankly no payday lender, would dare print.
The detection side got equally hostile: funds report contributions received, Single Touch Payroll reports wages paid, and the ATO machine-matches the two streams continuously. The mismatch that used to surface at a quarterly audit now flags within weeks, which is why voluntary disclosure has become the only sane response to a missed run, the discount for coming forward exists precisely because the ATO will find it anyway.
The clock stops at RECEIPT, not at payment
The deadline is satisfied when the contribution arrives IN the employee's fund, not when it leaves the business account. Clearing houses, fund processing queues, and rejected files (a wrong member number bounces the whole line) all eat days that count against the 7. Employers who schedule the super run on payday itself, rather than day five, buy themselves a margin that absorbs ordinary friction.
The mechanical checklist for a small employer: pay the super file the same day as wages, reconcile fund receipts weekly rather than quarterly, fix bounced contributions within 48 hours, and validate member details whenever staff change funds. Every item is boring; every item is cheaper than one SGC assessment, and every item takes minutes once it lives inside the normal pay-run routine.
Directors are personally on the hook
Unpaid super pierces the corporate veil: under the director penalty notice regime, the ATO can pursue directors' PERSONAL assets for a company's SG shortfalls, and for unreported amounts the lockdown DPN allows no remission even after liquidation. 'The company failed' is not a defence to this particular debt, which is exactly the design.
For directors of cash-tight businesses, the practical rule is stark: super ranks with PAYG withholding as the money you never touch, ahead of suppliers, ahead of rent, arguably ahead of your own salary. If the business genuinely cannot fund a super run, the survivable move is immediate contact with the ATO and a payment plan BEFORE the deadline passes, entering the SGC regime voluntarily and early is expensive; entering it via a DPN eighteen months later is how directors lose houses.
Employees reading this page have one action too: if your fund's transaction feed shows a missing cycle, raise it with payroll the same week, and if it repeats, the ATO's unpaid-super notification form exists for exactly that pattern. Under payday super the trail is fresh, which is the whole point of the reform, and fresh trails are the ones that end in recovered money.
How the SGC penalty math works
Miss the payday super deadline, contributions in the employee's fund within 7 business days of payday from 1 July 2026, and the Superannuation Guarantee Charge machinery starts: the shortfall itself, daily-compounding interest at the ATO's General Interest Charge rate, and an administrative uplift of up to 60% of the shortfall.
The calculator accrues each component from your inputs so an employer can see the real cost of a late run before deciding how urgently to fix it. The answer is always 'more urgently than you think', because two of the three components are not tax-deductible.
Calculation Steps:
- The shortfall is the super guarantee amount that failed to reach the fund on time.
- GIC interest compounds DAILY on the shortfall from the day after the deadline until the charge is settled.
- The administrative uplift scales up to 60% of the shortfall, with voluntary early disclosure the main lever that reduces it.
- Total SGC = shortfall + GIC + uplift, and unlike ordinary super contributions, the penalty components are not deductible business expenses.
Worked example
A café's payroll run fails and a $1,000 super contribution misses the 7-business-day window.
GIC starts compounding daily on the $1,000 from day one past the deadline.
The administrative uplift adds up to $600 in the worst case, on top of interest.
If the owner self-reports within days and pays, the uplift lands at the low end; if the ATO finds it first through fund-reporting mismatches, the high end applies.
Either way the $1,000 mistake costs $1,100-$1,700 once interest and uplift settle, and none of the penalty is deductible, at a 25% company rate the after-tax sting is a third worse than it looks.
Input definitions
Review the glossary of terms used in the calculation model below. Click on highlighted links to read more in-depth definitions in our financial glossary:
| Parameter | Definition & Context |
|---|---|
| Unpaid Super | The super guarantee amount that missed the deadline; every penalty component scales from it. |
| Days Late | Days from the deadline until the fund actually receives the money, receipt, not transfer initiation, stops the clock. |
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