The IRS and state tax agencies are increasingly cracking down on people who claim the same dependent more than once, such as estranged parents both claiming the same child. Tax preparers increasingly will ask that you provide Social Security cards for yourself and for each dependent. This helps eliminate electronic filing errors by making sure the name and Social Security Number matches the IRS records for each person on the tax return.

You also need to bring documents to show all your income for the year. These documents may include:

• W-2s from your employers,
• 1099-MISC forms for self-employment income,
• 1099-INT (interest) and 1099-DIV (dividends) forms,
• 1099-B forms showing brokerage trades in stocks and bonds,
• K-1 forms for income from a partnership, small business, or trust,
• 1099-SSA form showing Social Security received.

Be sure to bring written documents for additional income not reported on a W-2 or 1099 form, such as other self-employment income, rental income, or alimony. This could be a spreadsheet, bank statements, or other written evidence.

Bring canceled checks, receipts, or spreadsheets for any tax-related expenses. This may include contributions to your traditional or SEP-IRA, moving expenses, college expenses, medical and dental expenses, real estate taxes, gifts to charities and churches, and daycare or childcare costs. Some expenses are reported to you. Mortgage interest, for example, is reported to you on form 1098, and student loan interest is reported on form 1098-E.

If you paid estimated taxes, bring a summary of your federal and state estimated payments and canceled checks.

If you don’t have all your documents, your tax accountant will be able to help you track down the missing information. If You Are Missing a W-2 Form you can ask your employer to send new a copy of your W-2. Some employers charge a nominal fee for this service. Employers are required by law to keep copies of your W-2s and other payroll information for at least four years.