Super contributions are deductible in the financial year the fund actually receives the money — not the year you initiate the payment. This single rule causes more avoidable tax errors than any other EOFY item.
The Q4 Super Guarantee (covering the April–June quarter) is technically due by 28 July 2026. If you wait until that deadline, the fund receives your contribution in July, and the deduction lands in 2026-27 — not the 2025-26 year you'd expect. To claim Q4 super against your 2025-26 income, the contribution must clear into the employee's fund by 30 June 2026. With most clearing houses, that means paying by mid-June at the latest to allow processing time.
This year, the timing question is sharpened by two structural changes. First, the Small Business Super Clearing House (SBSCH) — the free ATO-run service many small employers rely on — closes permanently on 30 June 2026. Every employer using SBSCH needs to switch to a commercial clearing house (Beam, ClickSuper, Xero Auto Super, MYOB Super Portal, QuickBooks Super) before then. Second, from 1 July 2026, Payday Super replaces quarterly cycles entirely — so Q4 2025-26 is the last quarterly super run for any Australian employer.
Practical sequence for June 2026: confirm your June payroll figures by mid-month; if you're still on SBSCH, switch to a commercial clearing house now (allow 1–2 weeks for activation); pay Q4 super through the new clearing house with enough lead time for funds to clear by 30 June (10 business days is a safe buffer); reconcile against your accounting software so the deduction shows in the correct year.
If you miss the 30 June clearing window, you don't lose the deduction permanently — it just shifts to next year. But for businesses showing strong 2025-26 profit, that timing miss can cost meaningful tax. Worse, if you miss the 28 July deadline as well, late SG attracts the Super Guarantee Charge, which is not deductible at all and includes interest and an admin fee.