/** Per-invoice net monthly without GST (snapshot monthly minus penalty). Mirrors invoice detail / tax PDF. */
export declare function resolveInvoiceNetMonthlyWithoutGst(snapshotMonthlyAmount: unknown, penaltyAmount?: unknown): number;
/**
 * SQL expression for one invoice row's net monthly without GST.
 * @param alias Invoice table alias (e.g. `i`)
 */
export declare function sqlInvoiceNetMonthlyWithoutGst(alias: string): string;
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