| h | Surtax as % of taxable income |
| a | Basic (fixed) allowance |
| d | Basic wastable tax credit, non-tapered |
| i | Surtax as % of gross earnings |
| j | Surtax as % of central government tax measured gross of tax credit |
| f | Basic non-wastable tax credit, non-tapered |
| g | Basic non-wastable tax credit, tapered |
| c | A combination of a basic allowance and an additonal tapered allowance |
| b | Basic fixed allowance, tapered |