Today is the deadline for several tax filings.

File an extension or file your return. As long as your extension is postmarked by today, the IRS will grant you an extra six months to finish up your return.

Last day to fund an IRA for tax year 2007. Saving money in an individual retirement account is a great way to save on a tax-deferred basis. Find out if a Traditional or Roth IRA is better for you, and make sure you indicate that your contribution is for last year.

Estimated tax payments are due for the first quarter 2008. Even if you aren't done with your '07 taxes, you may need to start paying in towards your 2008 tax liability.