(MONEY Magazine) – It's almost April—do you know where your IRA contribution is? A recent Fidelity survey found that only 37% of IRA owners had contributed for the 2006 tax year. And only 7% of those without an IRA planned to open one by the April 17 tax deadline.

• ACT NOW You and your spouse can each put away as much as $4,000; $5,000 if you're 50-plus. Procrastinating will cost you. An annual $4,000 contribution starting this year will grow tax-deferred—or tax-free in a Roth IRA—to $434,741 by 2036, assuming a 7% annualized return. Wait until next year to start contributing and you'll have $402,300.