Does anyone use asset depletion as a source of income for purposes of calculating the DTI?

I have not heard a lot about this or seen any guidance.

For example, taking 75% of available assets and amortize over 120 months?

Only an idiot would deplete their assets voluntarily in that manner unless they were already 80 years old. It doesn't sound like a sound underwriting practice regardless of whether you would be allowed under the Regulation to do it. Now estimating a 4% a year draw from retirement accounts, I could understand.