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Tax time provides an opportunity to cash in many of the rewards of dabbling in last year's red-hot real estate market — but there are numerous tax traps if you sold a home, refinanced your mortgage or bought an investment property in 2005.

Although the rules are too twisted to explain fully, here's a brief primer of four common real estate transactions that could leave you vulnerable in an audit:

1 If you sold your home: Most sellers can cash in one of the biggest perks in the tax code. Couples can sell their home for a $500,000 profit without paying a cent of income tax. Single taxpayers can pocket $250,000.

To qualify, the house must be your principal home for two of the past five years — and even then there's flexibility because those periods don't have to be continuous and there are numerous hardship exceptions.

If your gain is over the exclusion amount, hunt for expenses such as the cost of home improvements, real estate commissions and title insurance that can pad your "tax basis." Every $1,000 you track down will save nearly $250 in federal and state taxes.

Tax trap: The rules changed dramatically in mid-1997. Until then, homeowners could defer tax on their gain by rolling it into the purchase of a more expensive house. If you traded up before the rules changed, you must count that deferred gain against your $250,000 to $500,000 exclusion.

You can pluck the deferred gain from Form 2119, attached to your tax return for the year you sold the previous home. But it will be difficult to remember — let alone prove — what costs you incurred in your current home if you don't save receipts and records.

2 If you bought a home: One huge benefit of buying a home is that you generally can deduct the mountains of interest you pay. That probably means you'll graduate into the class of taxpayers who can save more by itemizing mortgage interest, property taxes, certain loan costs and a raft of miscellaneous expenses rather than settling for the standard deduction every taxpayer is entitled to grab.

But there is a limit to what you can write off. You can deduct interest on up to $1 million of so-called acquisition debt and up to $100,000 of home equity debt.

Tax trap: That $1 million can also include a loan on a second home, but you can't deduct interest on what you borrow above that threshold.

3 If you used your home as a piggy bank: As interest rates crept higher last year, many homeowners refinanced their mortgages to lower their payments and siphon out cash. Others took out home-equity loans to tap the growing value of their real estate.

Refinancing can unleash some tax savings. For example, the charge for "points" — each point equals 1 percent of the loan — usually must be deducted incrementally over the life of the loan.

Tax trap: Tax pros increasingly are warning that home-equity loans are ripe for audit because few homeowners understand when they can't deduct all the interest they pay. Sometimes, even interest on refinanced loans can be limited.

"That's a minefield," said Lawrence K.Y. Pon, owner of Pon & Associates in Redwood City, Calif.

Generally, you can borrow up to $100,000 of home equity and deduct the interest, regardless of whether you used the money to remodel your home, buy a Prius, pay college bills or take a vacation. But that can change depending upon whether you borrowed more than $100,000, how you spent the cash, whether you owe the alternative minimum tax and other factors.

If you owe the AMT, for example, you usually can deduct the interest on up to $100,000 if you spent it to remodel your kitchen, but you get no write-off if you spent it on a car or other personal expenses.

4 If you became a landlord: Investors scooped up rental properties amid the housing boom, looking to profit from appreciation, rental income and a raft of tax breaks. For example, it's possible to pocket thousands of dollars in rent tax-free and defer taxes years into the future and potentially pay lower tax rates.

Tax trap: The rules of rental real estate are complex and often subject to dispute. It's highly recommended that you hire a pro to help you cut through the tangled rules of depreciation, passive activity income, capital gains and more.

The confusion can begin when the first tenant hands over a check. The first and last month's rent are income, but the security deposit isn't because it might be refunded.

The most obvious puzzle involves determining whether a bill can be written off immediately as a straightforward business expense or whether it must be depreciated over a number of years. This is an Alice-in-Wonderland portion of the tax code where landlords must depreciate an air conditioner in a window over seven years, while one on the roof takes 27 1/2 years.