Generally, two years of personal tax returns are required to verify the amount of your dividend and / or interest income so that an average amount can be calculated. (clearlending.com)
Such losses can be carried forward up to 20 years on personal taxes. (fortune.com)
If you are in the highest personal tax rate, this means paying as much as 30 % extra in taxes at the time you take the cash out of the company. (marsdd.com)