Question juridique clé
Whether default interest on late VAT payment was owed despite the authority's silence and alleged agreement not to collect it
Solution extraite
Default interest remained owed; no enforceable trust basis or waiver arose from the authority's conduct.
Motifs extraits
Under self-assessment, the taxpayer bears responsibility for proper payment. Default interest is statutorily due without reminder and cannot be waived by the authority. The letters and silence only concerned enforcement forbearance, not a postponement of maturity or interest waiver; the authority had no duty to object to the taxpayer's interpretation.