Hi there,
When you leave an employer you can transfer your pension savings into a maximum of 2 vested benefits accounts.
Because you cannot add to an existing vested benefits account, there may be times when you are forced to open new accounts even when you already have two existing accounts. This may ocur when you are unemployed and have placed your vested benefits into two accounts, and then you divorce and receive part of your spouse's pension savings - necessitating a third vested benefits account. This is perfectly legal and cannot be avoided in some situations.
Having several vested benefits accounts is beneficial because these acounts must be cashed out in full and closed when you want to withdraw money. Having several accounts lets you stagger the withdrawal of pension savings to avoid being pushed into a high tax bracket (which would be the case if you received a large amount of money in one shot).
Best regards from Moneyguru
More on this topic:
Vested benefits account comparison
How many vested benefits accounts can you open?