90‑5 How to work out the decline in valu90‑5 How to work out the decline in value of a starting base asset

#### 90‑5 How to work out the decline in value of a starting base asset (1) The decline in value of a \*starting base asset, relating to a mining project interest, during an \*MRRT year is as follows:  where: > base value is the base value of the asset for that year worked out under whichever of the following is applicable: (a) Subdivision 90‑B (book value approach); (b) Subdivision 90‑C (market value approach); (c) section 165‑60 (use etc. of starting base assets after starting base adjustment events). However, the base value may be reduced under section 90‑60 (partial disposal) or section 90‑65 (recoupment). > number of starting base days is the number of \*starting base days, in relation to the \*starting base asset, during the \*MRRT year. > write off rate is the write off rate under section 90‑10 or 90‑15 (whichever is applicable) for the asset for the year. (2) The decline in value during an \*MRRT year cannot be more than the asset’s \*base value for that year.