1099-B -- If you sold stocks, bonds or mutual funds, you will receive a 1099-B from your broker or mutual fund company. This will tell you the number of shares sold, when they sold and the amount you got for the sale. You'll need this information, along with the date you bought the shares and the amount you paid for them, to figure your taxes. Since 2011, brokers have been providing information on the basis (the cost of an asset plus some adjustments) of sold stock.
1099-G -- Taxpayers who got a refund of state or local taxes last year will get this form. If you used those taxes as a deduction on your previous year's federal income tax return, you'll need to report the 1099-G amount on this year's return. You don't have to worry about reporting this refund as income, however, if you took the standard federal deduction instead of itemizing.
1099-K -- If you received payments via credit or debit cards or from third-party payment processors, such as PayPal, Amazon and eBay, you might receive a 1099-K reporting those amounts. There are triggers for amounts ($20,000) and number of transactions (200), so not every person who receives such payments will get a 1099-K. This income, however, is taxable and should be reported even without issuance of a 1099-K. The new statement is an attempt to get more information on such payments to the Internal Revenue Service.
1099-R -- If you received a pension or a distribution from an individual retirement account or retirement plan, the 1099-R provides the details of these transactions. The form is issued by your broker, pension plan manager or mutual fund company. You'll also get a 1099-R if you rolled over money in a retirement plan, usually a 401(k) to an IRA, or if you converted a traditional IRA to a Roth IRA. A rollover usually is not a taxable event, but a pension payout may be.