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Degressive depreciation

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configurationaccountingfinancedepreciation
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Les Technologies Affutech 3000 inc., Boyan Tarlac

I am testing creation of assets in Odoo v18. When I choose degressive depreciation, it is not calculating the correct values. The monthly depreciation stays identical throughout the whole duration period instead of being adjusted at the end of each fiscal year.

I have searched online about this, but am unable to find anything. I have checked my configurations twice and followed instructions found in documentation to the letter. Is there anything I am missing?

Thank you in advance for your help.

Edited :

You can see on images that degressive depreciation is calculated as linear. Since I need to register monthly depreciation, I chose 132 months (11 years).


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Ray Carnes (ray)

Sharing a screenshot of the way you are defining your asset will probably be needed for readers to discover what you are missing.

Les Technologies Affutech 3000 inc., Boyan Tarlac
Author

Thank you Ray,

I didn't noticed the command prompt in text. I was looking for a button, therefore didn't know how.

I joined the image. As you can see the 134.84$ monthly depreciation is constant accross the entire 5 year period, instead of taking the residual amount at the beginning of each fiscal year.

econodoo, Econ Odoo

You're right. Odoo's calculation become linear in the last 5 years.

So I created a LasVegas Sphere: 1 billion, depreciated over 50 years,20%/year, it depreciate beautifully until 35k and 5 years left and then it just linear depreciate 8k/years.

So I create a CarPark with the value of 35k and deprecate 20%/year declinely with 5 years and it is depreciated exactly as the sphere.

I tried to read the code to find where the magic number (5 years) are but can't find anything. Odoo actually convert all the period life time in days.

However, in the documentation, Odoo also specified that the last entries will not use decline method. And maybe by last, it means the magic 5. This is understandable if you want to totally depreciate 100% of the asset value with the % and the number of period.

So good luck with your ticket.

The Declining Depreciation Method multiplies the Depreciable Value by the Declining Factor for each entry. Each depreciation entry has a lower amount than the previous entry. The last depreciation entry doesn’t use the declining factor but instead has an amount corresponding to the balance of the depreciable value so that it reaches $0 by the end of the specified duration.

Lasvegas sphere:
12/31/2059 Lasvegas sphere: Depreciation
$ 101,412.05 $ 999,594,351.81 $ 405,648.19
12/31/2060 Lasvegas sphere: Depreciation
$ 81,129.64 $ 999,675,481.45 $ 324,518.55
12/31/2061 Lasvegas sphere: Depreciation
$ 64,903.71 $ 999,740,385.16 $ 259,614.84
12/31/2062 Lasvegas sphere: Depreciation
$ 51,922.97 $ 999,792,308.13 $ 207,691.87
12/31/2063 Lasvegas sphere: Depreciation
$ 41,538.37 $ 999,833,846.50 $ 166,153.50
12/31/2064 Lasvegas sphere: Depreciation
$ 33,230.70 $ 999,867,077.20 $ 132,922.80

Carpark:
12/31/2025 Car park: Depreciation
$ 8,711.23 $ 8,711.23 $ 34,844.91
12/31/2026 Car park: Depreciation
$ 8,711.23 $ 17,422.46 $ 26,133.68
12/31/2027 Car park: Depreciation
$ 8,711.23 $ 26,133.69 $ 17,422.45
12/31/2028 Car park: Depreciation
$ 8,711.23 $ 34,844.92 $ 8,711.22
12/31/2029 Car park: Depreciation
$ 8,711.22 $ 43,556.14 $ 0.00

Les Technologies Affutech 3000 inc., Boyan Tarlac
Author

@Econ Odoo,

I think I have found a partial answer to my question. I did several tests and what I noticed is that the lifespan of 10 years is not nearly enough for degressive rate to apply (which I still don't understand). I extended the lifespan of equipment to 25 years and I can see degressive rate appear but, just like in your case, the last 5 years are linear. So I will do 2 things :

1. I will f/u on my ticket with Odoo and see if they can explain it to me better.
2. I will reach out to the external accountant to see if there are any fiscal consequences with gvt that could occur.

I do want to thank you for taking time to try and help me.

Once I have Odoo's answer, I will share it here.

Les Technologies Affutech 3000 inc., Boyan Tarlac
Author

An update on this post :

No matter which method we choose (Declining or Declining then straigth line), both will end up being Declining then straight line. This is beacuse it is mandatory to pick out a lifespan of the asset. The only difference is the moment at which the straight line method kicks in.

This makes sense because, if Declining method were to remain, the equipment would never be fully depreciated.

The problem I had in my example is that 10% depreciation rate on a 11 year lifespan is already below the straight-line method. This is why the system, was applying the straight-line method since year 1.

Here are some other examples where one could expect straight-line method to kick in :

20% rate =  5 years before end of lifespan

25% rate =  4 years before end of lifespan

33% rate = 3 years before end of lifespan


This confirms also what you observed at your end @Econ. I hope this info can help others on this forum.


Once again, thank you @Ray and @Econ for the help provided.

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Ray Carnes (ray)
Best Answer

The results you observed are actually correct and align with expected behavior.

After an audit of the calculation logic in prior versions, we concluded the way we were computing the schedule in Odoo 15.0 and prior versions was incorrect.

Odoo adheres to IFRS accounting standards, which require depreciation methods to reflect how an asset’s future economic benefits are consumed. For assets without a residual value, the declining method alone may not fully depreciate the asset to zero. To address this, Odoo compares the declining and straight-line depreciation schedules and switches to the straight-line method when it results in a higher depreciation expense. This ensures the asset is fully depreciated over its useful life.

This approach is consistent with other accounting frameworks as well. For example, the U.S. Internal Revenue Service (IRS) mandates switching to the straight-line method when it produces equal or higher depreciation compared to the declining method.

In summary, Odoo's implementation of the declining depreciation method incorporates this comparison for compliance with accounting standards. This feature was introduced in Odoo 16.0 and continues in Odoo 17.0 and 18.0.

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Les Technologies Affutech 3000 inc., Boyan Tarlac
Author

Makes sense. I need to see if same rules apply to Quebec and Canada. I assume yes.

Les Technologies Affutech 3000 inc., Boyan Tarlac
Author

@Ray

Odoo was unable to provide me any official documentation for this rule in Canada or Quebec. I am still looking on Canadian Revenue Agency website, but there is no information whatsoever on this method.

Once I find the definite answer, I will share it here.

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econodoo, Econ Odoo
Best Answer

I tried the Odoo runbot with depriciation of Trumps building worth 1 billion USD for 10 years with 30%/year. And I think I got the expected results.  So the issue maybe something specific to your instance, not with Odoo.(Pasting as text to save karma as a picture would exhause all mine).

12/31/2025Trump's building: Depreciation

$ 300,000,000.00

$ 300,000,000.00

$ 700,000,000.00

12/31/2026Trump's building: Depreciation

$ 210,000,000.00

$ 510,000,000.00

$ 490,000,000.00

12/31/2027Trump's building: Depreciation

$ 147,000,000.00

$ 657,000,000.00

$ 343,000,000.00

12/31/2028Trump's building: Depreciation

$ 102,900,000.00

$ 759,900,000.00

$ 240,100,000.00

12/31/2029Trump's building: Depreciation

$ 72,030,000.00

$ 831,930,000.00

$ 168,070,000.00

12/31/2030Trump's building: Depreciation

$ 50,421,000.00

$ 882,351,000.00

$ 117,649,000.00

12/31/2031Trump's building: Depreciation

$ 35,294,700.00

$ 917,645,700.00

$ 82,354,300.00

12/31/2032Trump's building: Depreciation

$ 27,451,433.33

$ 945,097,133.33

$ 54,902,866.67

12/31/2033Trump's building: Depreciation

$ 27,451,433.34

$ 972,548,566.67

$ 27,451,433.33

12/31/2034Trump's building: Depreciation

$ 27,451,433.33

$ 1,000,000,000.00

$ 0.00


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econodoo, Econ Odoo

If I depreciate over 60 periods of months which is equivalent to 5 years, I noticed that Odoo will calcualate the depreciation for the year and then equally divide that number for 12 months. So you'll see 12 numbers which is the same. But the number for the next year definately will be declined.

01/31/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 25,000,000.00 $ 975,000,000.00
02/28/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 50,000,000.00 $ 950,000,000.00
03/31/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 75,000,000.00 $ 925,000,000.00
04/30/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 100,000,000.00 $ 900,000,000.00
05/31/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 125,000,000.00 $ 875,000,000.00
06/30/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 150,000,000.00 $ 850,000,000.00
07/31/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 175,000,000.00 $ 825,000,000.00
08/31/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 200,000,000.00 $ 800,000,000.00
09/30/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 225,000,000.00 $ 775,000,000.00
10/31/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 250,000,000.00 $ 750,000,000.00
11/30/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 275,000,000.00 $ 725,000,000.00
12/31/2025 Trump's building: Depreciation
$ 25,000,000.00 $ 300,000,000.00 $ 700,000,000.00
01/31/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 317,500,000.00 $ 682,500,000.00
02/28/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 335,000,000.00 $ 665,000,000.00
03/31/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 352,500,000.00 $ 647,500,000.00
04/30/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 370,000,000.00 $ 630,000,000.00
05/31/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 387,500,000.00 $ 612,500,000.00
06/30/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 405,000,000.00 $ 595,000,000.00
07/31/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 422,500,000.00 $ 577,500,000.00
08/31/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 440,000,000.00 $ 560,000,000.00
09/30/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 457,500,000.00 $ 542,500,000.00
10/31/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 475,000,000.00 $ 525,000,000.00
11/30/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 492,500,000.00 $ 507,500,000.00
12/31/2026 Trump's building: Depreciation
$ 17,500,000.00 $ 510,000,000.00 $ 490,000,000.00
01/31/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 523,611,111.11 $ 476,388,888.89
02/28/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 537,222,222.22 $ 462,777,777.78
03/31/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 550,833,333.33 $ 449,166,666.67
04/30/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 564,444,444.44 $ 435,555,555.56
05/31/2027 Trump's building: Depreciation
$ 13,611,111.12 $ 578,055,555.56 $ 421,944,444.44
06/30/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 591,666,666.67 $ 408,333,333.33
07/31/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 605,277,777.78 $ 394,722,222.22
08/31/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 618,888,888.89 $ 381,111,111.11
09/30/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 632,500,000.00 $ 367,500,000.00
10/31/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 646,111,111.11 $ 353,888,888.89
11/30/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 659,722,222.22 $ 340,277,777.78
12/31/2027 Trump's building: Depreciation
$ 13,611,111.11 $ 673,333,333.33 $ 326,666,666.67
01/31/2028 Trump's building: Depreciation
$ 13,611,111.11 $ 686,944,444.44 $ 313,055,555.56
02/29/2028 Trump's building: Depreciation
$ 13,611,111.11 $ 700,555,555.55 $ 299,444,444.45
03/31/2028 Trump's building: Depreciation
$ 13,611,111.11 $ 714,166,666.66 $ 285,833,333.34
04/30/2028 Trump's building: Depreciation
$ 13,611,111.11 $ 727,777,777.77 $ 272,222,222.23

Les Technologies Affutech 3000 inc., Boyan Tarlac
Author

Not sure I am following on what you mean by instance. I created several different assets, all of them with different amounts. However, no matter what I do, it is not working. The depreciation is applying linear instead of degressive. I also tried setting to years instead of months, but still no change.

I notice some slight variation if depreciation rate is above 25%, but other than that it is always linear no matter what I do.

I opened a ticket with Odoo, and am still waiting to hear back.

Les Technologies Affutech 3000 inc., Boyan Tarlac
Author

@Econ Odoo,

Look at the two images you provided.

Image 1 : Last 3 years, the amounts are identical (27 451 433.33$). There should still be some variation even if it's minimal.

Image 2 : Your monthly depreciation is identical in 2027 and 2028 (13 611 111.11$).

Those should not be ocurring.

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