Formula to stop depreciation after useful life

[Mahmoudelnemr]

The attached table, first column is the truck code,3rd column is the price of new tires, the 4th column is the depreciation cost

https://photos.app.goo.gl/Gtt76KvF51Yt8xCi8

I want to depreciate the cost of new tire over 26
months
So i made a formula for the 4th column
=IF(A2=A1,D2/26+E1,D2/26)
If same truck id sum the depreciation of different tires for the same truck

The problems is that after the 26 months, the formula contunues to add depreciation cost, i want it to stop after 26 months

Any help

 

[Fluff]

Cross posted https://www.excelforum.com/excel-formulas-and-functions/1275991-how-to-stop-depreciation.html

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