A tax expert says that National's proposed tax changes demonstrate the challenges of conveying complicated policies to the electorate.   

The party is defending its policy after it was revealed just 3000 households will reap $250 in tax relief a fortnight.  

They say the promised rebate to the average family always came with the caveat that it was "up to" $250.  

Geof Nightingale told Mike Hosking what he thinks the situation conveys.  

He says it shows policies interact in complex ways which is hard to promote simply for voters. 

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• NZers aren't 'fools', says Willis, confirms just 3000 households will get full tax relief