# Stock Adjustments in PGBP Computation
When opening or closing stock is incorrectly valued, the profit must be adjusted to arrive at the correct PGBP income.
## Adjustment Rules
| Situation | Effect on Profit |
|---|---|
| Opening Stock undervalued | Less (deduct from profit) |
| Opening Stock overvalued | Add to profit |
| Closing Stock undervalued | Add to profit |
| Closing Stock overvalued | Less (deduct from profit) |
## Logic
- Opening Stock appears on the debit side of Trading Account → it reduces profit.
- If undervalued, it has under-reduced the profit, i.e., profit is overstated → reduce profit by amount of undervaluation.
- If overvalued, it has over-reduced the profit → add back the overvaluation.
- Closing Stock appears on the credit side of Trading Account → it increases profit.
- If undervalued, it has under-increased the profit → add the undervaluation.
- If overvalued, it has over-increased the profit → deduct the overvaluation.