Questão jurídica principal
Whether the husband's self-employment income was correctly estimated at CHF 1,000 instead of CHF 500.
Decisão extraída
The supervisory authority could estimate the income based on the available circumstances and prior garnishment data; no abuse of discretion was shown.
Fundamentação extraída
Because the husband kept no accounts and produced no reliable evidence of income, the authority was entitled to estimate earnings and rely on figures from an earlier garnishment.