it depends where the money is coming from. If it's your money, you have to claim it evenif the account is under your wife's name. However, if both of you have income, you can say that the money is from your wife. For example, you wife earns $20,000 each year for the past 3 years, and you earn $100,000. You have accumulated $60,000 in your account in the past three years. Then you wife can claim the tax because all your wife's income (pre-tax) were used for investing and your income were used for paying the bills. This is perfectly ok.
Not an exact answer but you got the idea. If not sure, ask for professional help.