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Check your math -- and check it again

Each of us has occasionally felt like Homer Simpson. Confronted by some silly mistake we made, we slap our forehead and mutter "D'oh!"

But when it comes to taxes, that "D'oh!" can cost dough. Sometimes the error means we have to pay more in taxes. Other times it delays the refund we're expecting from the Internal Revenue Service.

The most common mistake, year after tax year, is bad math. In the hurry to get forms filed on time, taxpayers make errors adding, subtracting, dividing and calculating percentages. Here's how to avoid this mistake and get through tax-filing season with a fuller bank account and your good humor still intact!

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Bad math
Far and away, says the IRS, the most common mistake on tax returns is bad math. Numbers are transposed, left out or totaled incorrectly.

It may be simple addition and subtraction, but when you're looking at pages full of figures it's easy to mess up a few. And since a total figured on one tax form or worksheet often is transferred to another form (or forms), a simple mistake could quickly compound.

The tax agency automatically examines all returns for mathematical errors. Mistakes in arithmetic or in transferring figures from one schedule to another will get you an immediate correction notice.

So invest now in a calculator and use it -- repeatedly -- to double check your math as you complete your tax return.

Math mistakes alone rarely lead to a full audit, but they can reduce your tax refund or result in you owing more tax than you thought. If the error leads to you owing tax, the IRS automatically bills you. If your error means you overpaid, the excess is applied to future taxes, credited, or refunded at your request.

And remember that checking math works both ways. If you do get an IRS correction notice, be sure you also check their numbers. They have been known to make mistakes, too.

 

-- Updated Dec. 17, 2004

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