I'm not gonna lie, I haven't seen ABAP in 10 years and was only briefly familiar with it. But I did what one does and asked GPT4 for some tax computation ABAP.

DATA: lv_income TYPE P DECIMALS 2 VALUE '50000',
      lv_tax_rate TYPE P DECIMALS 2,
      lv_tax_amount TYPE P DECIMALS 2.

* Select the appropriate tax rate from the tax table based on income
SELECT SINGLE TAX_RATE INTO lv_tax_rate 
FROM ZTAX_TABLE 
WHERE INCOME >= lv_income 
ORDER BY INCOME ASCENDING.

IF sy-subrc = 0.
  lv_tax_amount = lv_income * lv_tax_rate / 100.
  WRITE: / 'Income:', lv_income,
         / 'Tax Rate:', lv_tax_rate,
         / 'Tax Amount:', lv_tax_amount.
ELSE.
  WRITE: / 'No tax rate found for income', lv_income.
ENDIF.