@matt3k Here in Denmark you are required by law, to save every thing in your records for 5 years, I don't know how it is in other countries, but I would guess that it is similar.
Here in NZ, the time limit id 7 years. However, if the IRD deem a tax return to be fraudulent, then there is no time limit on how far back they can go. So, keeping records for longer is worth considering.
Hans