This is the time of year when we stress out about all the taxes we owe on our salaries, our dividends, our interest, our gains on great stock purchases, and seemingly zillions of other things. Contrary to what you might assume, though, not every financial event is taxable. Here are a few reasons to breathe easier while you're filing that 1040.

Splitting shares
Stock splits certainly make it look like something major has happened with your stock holdings. Here are some from the past few years:

Company

Recent Stock Split(s)

Green Mountain Coffee Roasters (Nasdaq: GMCR)

3-for-1 in 2007, 3-for-2 in 2009

Myriad Genetics (Nasdaq: MYGN)

2-for-1 in 2009

Activision Blizzard (Nasdaq: ATVI)

2-for-1 in 2008

Buckle (NYSE: BKE)

3-for-2 in 2008

Illumina (Nasdaq: ILMN)

2-for-1 in 2008

Ebix (Nasdaq: EBIX)

3-for-1 in 2010, 3-for-1 in 2008

Patriot Coal (NYSE: PCX)

2-for-1 in 2008

Data: Yahoo! Finance.

If you owned 100 shares of Green Mountain Coffee Roasters in early 2007, you'd have ended that year with 300 shares, and would have 450 shares now. More shares means more money, right? And more money means more taxes? Not quite.

There's no taxable event, because the value of your total holdings didn't really change. Suppose that you owned 100 shares of a stock trading at $40 per share. Your total stake, therefore, is $4,000. If it splits 2-for-1, you'll own twice as many shares, but they'll be worth $20 apiece -- so now your holding is worth 200 times $20, or... $4,000. The split doesn't change the total value of your stake in the company, just the number and price of your shares, so you haven't realized any taxable gain. Many growing companies will split their shares over time, but the splits themselves shouldn't be exciting.

Similarly, stock buybacks won't increase your tax bill, either. If  a company buys some of its own shares and essentially retires them, it'll shrink the pool of existing shares. Therefore, your shares will represent a bigger piece of the overall pie, increasing the company's earnings per share. That small change in value ultimately ends up reflected in the stock price, but it'll only be taxed as a capital gain when you sell your shares.

Ta-ta, taxes!
Finally, you don't need to worry about any capital gains generated in your IRAs. If they occur when you sell stocks in your Roth IRA, you can just kiss those taxes goodbye. Play by the rules with a Roth, and you'll eventually withdraw all your contributions and gains tax-free. With traditional IRAs, your gains are tax-deferred, and any withdrawals are eventually taxed at your ordinary income tax rate. (Learn about the best stocks for IRAs.)

Given all the times the IRS does dip into your pocket, it's nice to know that Uncle Sam's hand isn't outstretched every time you experience a financial event.

Editor’s note: We have removed a section of this article regarding tax laws that may no longer apply in 2010.

Longtime Fool contributor Selena Maranjian owns shares of Activision Blizzard. Ebix and Green Mountain Coffee Roasters are Motley Fool Rule Breakers recommendations. Activision Blizzard and Illumina are Motley Fool Stock Advisor picks. Motley Fool Options has recommended a synthetic long position on Activision Blizzard. The Fool owns shares of Activision Blizzard and Ebix. Try any of our investing newsletter services free for 30 days. The Motley Fool is Fools writing for Fools.