If anyone under the tax free threshold will not lose a cent on their dividend income.
The answer is they will lose 30%.
If they earn $7,000 in dividends and $3,000 in franking credits. Their income is $10,000 at tax return time this is what is declared. But wait they can only have $7,000 and ATO keep the other $3,000.
If they earn $10,000 income in Bank interest they get to keep the whole $10,000 at tax return time.