Instant Asset Write-Off

What it does

Under standard tax treatment, a business purchasing a $20,000 solar system depreciates it over its effective life (typically 20 years under the ATO’s tax depreciation schedules for solar). The tax benefit is spread across two decades.

The instant asset write-off allows eligible businesses to deduct the full $20,000 in the year of purchase. At a 25% company tax rate, that’s a $5,000 tax reduction in year 1 rather than ~$250/year for 20 years. The present value difference is significant.

Eligibility and thresholds

The scheme has changed frequently since its introduction and expanded significantly during COVID as a stimulus measure. As at the 2024-25 financial year:

• Aggregated turnover threshold: $10 million (check current threshold - it has varied between $500M and $10M across different years and measures)
• Asset cost threshold: Currently $20,000 per asset (previously $150,000 under temporary COVID measures; check ATO for current figure)
• The asset must be first used or installed ready for use in the income year of the deduction

For clean energy assets - solar systems, battery storage, EV chargers - that fall within the threshold, the write-off is straightforward to apply.

Interaction with the Energy Incentive bonus deduction

From 2023, the federal government introduced a Small Business Energy Incentive - a 20% bonus deduction on the cost of eligible depreciating assets that support energy efficiency, up to $20,000 additional deduction (i.e., 120% deduction in total). This is separate from and additive to the standard instant asset write-off.

Combined, a small business buying an eligible $20,000 battery storage system could potentially deduct $24,000 in the year of purchase (100% write-off + 20% bonus = 120% deduction), resulting in a tax saving of $6,000 at 25% company tax rate.

The bonus deduction has specific eligibility dates and asset categories - check the ATO and consult a tax adviser before relying on this.

What this means practically

For business owners considering solar or battery storage, the tax treatment significantly alters the effective payback calculation. A $30,000 commercial solar installation might cost an eligible small business $22,500 after a 25% company tax write-off in year 1. Calculate payback on the after-tax cost, not the sticker price.

This is one reason commercial solar installations often make stronger financial cases than residential, even on a per-kW basis - businesses get the tax deduction that residential owners do not.