Penalty framework for wealth-tax returns restructured to set fixed ranges, a reasonable-cause exception, and revised limitation safeguards. Amendment restructures section 18 to revise penalty clauses, establish minimum and maximum penalties for specified failures, introduce a reasonable cause exception, deem certain first-time non-assessees who belatedly file returns but are found to have assessable net wealth to have concealed or furnished inaccurate particulars, and modify delegated approval and limitation rules for imposing penalties while excluding specified periods when computing limitation.