Thanks guys, looking back at my last tax return i left that field blank, i would have had less than $5000 worth of stock so i think i must have thought i didn't have to do it.

So I guess all i have to do i state my opening stock as $0 and closing stock as the total value to fix this up.

I don't have huge range of stock so it won't take long at all to work out the value. Im not even certain it would be above $5000. If it does work out lower than $5000 then does that mean i i can just leave it at $0 or would i better of just declaring the stock value to make it easier on my future tax returns?