It's the end of the school year and a teacher is going through a shoebox of receipts for books, stationery and classroom decorations, wondering how much of that spend they can actually claim back at tax time.
AU: Refund benefit = Deductible spend × Marginal tax rate
US: Deduction = min(Spend, $350 per educator above-the-line cap) + itemised excess if applicableIn Australia there is no fixed dollar cap on the work-related self-education/supplies deduction, but claims over $300 in total work-related expenses require written evidence. In the US the IRS Educator Expense Deduction is a fixed above-the-line cap that rose to $350 per educator for the 2026 tax year, with an additional uncapped itemised deduction newly available from 2026.1 What this calculator does
Estimates the tax benefit of money spent out-of-pocket on classroom supplies. In Australia it applies your marginal tax rate to the deductible spend to show the estimated refund benefit. In the United States it applies the IRS Educator Expense Deduction cap ($350 per eligible educator, $700 for a married couple who are both educators, for the 2026 tax year) and flags any excess that may be claimed as an itemised deduction.
2 Formula & professional reasoning
AU: Refund benefit = Deductible spend × Marginal tax rate
US: Above-the-line deduction = min(Spend, $350 per educator)
US excess (2026+): Spend above cap can be itemised on Schedule A (uncapped)
In Australia, work-related deductions reduce taxable income rather than providing a direct dollar-for-dollar refund, so the real benefit depends on the claimant's marginal tax rate — a teacher on the 37% bracket gets a bigger dollar benefit from the same $500 spend than a teacher on the 19% bracket. The ATO does not cap this deduction at a fixed dollar figure, but requires substantiation once total work-related claims exceed $300. In the US, the Educator Expense Deduction is a fixed above-the-line amount set by the IRS and indexed in $50 increments — it directly reduces adjusted gross income regardless of whether the taxpayer itemises, which is why it is described as "above-the-line." From the 2026 tax year, a second, uncapped itemised deduction was added for spend beyond the $350 cap.
3 Worked examples
⚠️ Illustrative example only — not financial or professional advice.
Refund benefit: 420×0.325=$136.50Refund benefit: 850×0.37=$314.50Above-the-line cap: $350×2=$700 | Claimed: min(920,700)=$700 | Excess: 920-700=$2204 Sanity check
5 Common errors
| Error | Cause | Consequence | Fix |
|---|---|---|---|
| Claiming items not directly related to teaching duties | Including general classroom decoration or personal items alongside genuine teaching resources | Risk of the claim being disallowed on review in Australia, or disqualified as a qualified expense by the IRS in the US | Only claim items directly used for teaching — books, stationery, instructional software, professional development and (in the US) specific categories the IRS lists as qualifying. |
| Not keeping receipts because the amount seems small | Assuming small individual purchases do not need to be tracked | Unable to substantiate the claim if reviewed, especially once the AU $300 threshold or the US cap is exceeded | Keep every receipt (digital photos are fine) and log the date, item and amount as you go, rather than trying to reconstruct records at tax time. |
| Assuming the US deduction is a full dollar-for-dollar refund | Confusing an above-the-line deduction with a tax credit | Overestimating the actual cash benefit at tax time | Remember the deduction reduces taxable income, not tax owed directly — the real dollar benefit depends on your marginal tax rate, similar to the AU calculation. |
| Forgetting employer reimbursements reduce the deductible amount | Claiming the full purchase price when the school has already reimbursed part of it | Over-claiming, which can trigger a review or amendment | Only claim the unreimbursed portion of any purchase — subtract any amount the school has already paid back. |
6 Reference & regulatory links
7 Professional workflow
Common tools used alongside this one: