Next Monday (October 16) is the final deadline to file 2005 tax returns but tax season never ends. When it comes to taxes you plan for at least two years – this year and next. Doing so isn’t rocket science. Tax strategy requires only three tools: a good set of books, a ‘good enough’ estimate of future profits, and a good advisor.

The easiest way to learn it is to do it. Just run through the drill a few times each year. So this week, activate your financial team. Pull together the numbers, call your tax advisor, and ask how to minimize taxes taking a multi-year approach.

If you’re a DIYer, free counsel abounds. For instance, if you like your tax tips with a little attitude, check out TaxMama.com and if you want to hear it straight from the horse’s mouth, start with the IRS’s tax calendar:

Individuals. If you have an automatic 6-month extension to file your income tax return for 2005, file Form 1040, 1040A, or 1040EZ and pay any tax, interest, and penalties due.

Partnerships. File a 2005 calendar year return (Form 1065). This due date applies only if you were given an additional 6-month extension. Provide each partner with a copy of Schedule K-1 (Form 1065) or a substitute Schedule K-1.