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SamGee(Newbie)Newbie
5 Jan 2023

Hello @Jodie_ATO ,


You say that the life of solar panel installation is 20 years. Which I think is reasonable. However your published depreciation rates say that we can claim 10% per year for the diminishing value method of depreciation.


If you run a depreciation at 10% pa for 20 years you are left with around 12% of the initial value remaining in the 20th year. This is is no where near zero nor even near 10% of the initial value. This diminishing value rate favours the ATO by reducing tax deductions, does not assist with inflation and it does not favour the tax payer for various other reasons.


An annual rate of nearly 20% (I used 19.2%) for the diminishing value method brings the balance in the 20th year close to 1% of the initial value, not zero but much closer.


How do you calculate the rate of 10%? It seems entirely unreasonable for a life of 20 years and does not take into account that the value of the item should be zero or close to it in the 20th year?

15,308 views
2 replies
15,308 views
2 replies

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JodieR_ATO(Community Support)Community Support
5 Jan 2023

Hi @SamGee,


We appreciate your feedback and the time you've taken to provide this to us. If you'd like guidance on how they determine the rate of depreciation for solar panels you can contact our tailored technical assistance area. They should be able to provide you with further guidance on the matter. You'll need to include some personal details so they can respond to you in writing.


You can also view the TR 2022/1 for effective life of assets.

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Most helpful reply

JodieR_ATO(Community Support)Community Support
5 Jan 2023

Hi @SamGee,


We appreciate your feedback and the time you've taken to provide this to us. If you'd like guidance on how they determine the rate of depreciation for solar panels you can contact our tailored technical assistance area. They should be able to provide you with further guidance on the matter. You'll need to include some personal details so they can respond to you in writing.


You can also view the TR 2022/1 for effective life of assets.

23 July 2024

Hi @SamGee, if you want depreciation to come down to $0 after 20 years, then use the prime cost/straight line rate of 5% over 20 years, instead of the 10% diminishing value rate.


It'll be a lower claim though in the early years.


You have a choice; higher initial claims under 10% diminishing value, or the same claim every under prime cost. Its your choice.

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Solar Panel Depreciation Rates | ATO Community