Every Document You Need to Defend Yourself During an AuditHere's how to prepare for an IRS audit.

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Defending yourself during an IRS audit can be a time-consuming, stressful affair — but audits aren’t uncommon. During the 2015 fiscal year, the IRS audited nearly 1.4 million tax returns, including approximately 1.2 million returns from individuals. In addition, it sent about 1.7 million notices to taxpayers regarding math errors on their returns.

Keeping good records and maintaining organized documents is crucial to protect yourself if you’re audited. The trick is knowing what records to keep and how long you should keep bank statements and other documentation. In the event of an audit, here’s what you need to know about which tax receipts to save.

What Is an Audit?

If you’ve been notified of a tax audit, you’re probably wondering, “What does being audited by the IRS mean?” A tax audit is a review of your accounts and financial information by an IRS agent or state auditor to make sure you correctly reported your income, expenses and credits in accordance with tax laws. You should generally keep tax-related documents for three years from the date you filed your return, according to the IRS.

Find Out: 30 Ways to Prevent a Tax Audit

Documents You’ll Need to Defend Yourself During an Audit

If you have to defend yourself during an IRS tax audit, you’ll need documentation for what you claimed on your return. “If a filer can have any and all tax-related documentation organized prior to completing his or her return, it will help to save time, stress, and uncertainty about the information being included,” said Andrew Oswalt, certified public accountant and tax analyst for TaxAct, a tax preparation software company.

Whether you bank online or receive hard copies of your bank account statements, make sure you keep all relevant proof of what you spend and where. In addition, save the following important documents required for a tax audit:

  • Receipts: Receipts prove what you spent your money on, so keep bank account and credit card statements, retail receipts and donation receipts from charitable organizations.
  • Bills: You can show you paid bills through ATM, credit card, and debit card receipts, or you can provide the actual bills for which you claimed deductions.
  • Canceled checks: Keep canceled checks you’ve written to pay for a home or fees associated with the sale of a home, renovations and nondeductible contributions to an individual retirement account. Also save canceled checks you’ve used to pay for charitable contributions, tax payments and alimony and child support for at least the last seven years.
  • Loan agreements: In addition to your home mortgage loan documents, keep any paperwork associated with a second home and personal, business and car loans, even if they’re paid off. This kind of paperwork is good to keep even if you don’t get audited — just in case you have a loan dispute down the road.
  • Logs: If you’re claiming a mileage deduction for business, moving, medical or charitable purposes, you’ll need to keep a trip log. In addition, you might need a log for your gambling winnings and losses if you’re writing them off.
  • Investment statements: Save proof of all stock and bond purchases. If you’re taking deductions for worthless securities, keep those records for at least seven years.

If you have no records for an IRS audit, you can’t prove you’re entitled to the deductions you claimed. Make sure you have good records, or the IRS could prevail in an audit.

Related: Common Mistakes You Might Make When Filing Your Own Taxes

Types of Tax Returns That Get Selected for an Audit

The IRS uses different methods to figure out which returns to audit. It uses statistics to determine the “normal” range for various credits and deductions that people in similar life situations take. Computer programs compare your return with that range, and if yours is significantly different, you might be audited. The IRS might also decide to audit your return if it’s investigating related taxpayers, such as your business partners. In addition, the IRS can decide to randomly audit your return.

If your return is selected for an audit, an auditor reviews it first. If he finds something questionable, he forwards it to an examination group. Next, you’re notified by mail that you’re being audited. If anyone calls you to tell you you’re being audited, it’s a scam; the IRS never initiates an audit via phone.

Related: 7 Signs You’re the Victim of a Tax Scam

How to Defend Yourself During the Tax Audit Process

An IRS tax audit can take the form of a personal interview or can be conducted by mail. Prepare your tax audit defense by gathering documents to support the information on your tax returns.

During the IRS audit process, your accounts and financial information will be examined to ensure you reported your information correctly and legally. Providing documentation for every aspect of your financials is the best thing you can do to defend yourself.

If your audit process takes place in person, it might be conducted at an IRS office or your home, place of business or accountant’s office. Here are five basic rights you have during the audit process, as outlined on the IRS website:

  • Professional and courteous treatment by IRS employees
  • Privacy and confidentiality regarding your tax matters
  • Knowledge about why the IRS is asking for information, how the IRS will use it and what will happen if you do not provide the requested information
  • Representation of yourself or an authorized representative
  • The option to appeal disagreements, both within the IRS and before the courts

An audit can come to a conclusion in one of three ways:

  • No change: No changes result because you have provided evidence of all items.
  • Agreed: The IRS proposes changes and you agree.
  • Disagreed: The IRS proposes changes and you do not agree.

If you disagree with the audit findings, you can request further review by a manager, or you can file an appeal. To contact the agency for help, call 800-829-1040. You can also find detailed information and answers to your IRS questions at IRS.gov.

You might want to get in touch with the Taxpayer Advocate Service, an independent organization within the IRS. TAS is designed to protect your rights and help you with tax problems you can’t resolve yourself. If you can’t afford a tax attorney to represent you in an audit, you might be eligible for representation by an enrolled agent at a low-income taxpayer clinic.

Minimize Odds of an Audit

Because the IRS randomly selects some returns to audit, there’s no way to completely audit-proof your return. Following these simple tips, however, can go a long way toward reducing your chances of getting audited.

Be Honest

The IRS includes falsely padding deductions as one of its “dirty dozen” tax scams. If you’re entitled to a deduction or credit, take it; however, don’t report extra deductions — like charitable contributions you never made or business expenses that were really personal costs — because you’re asking for trouble.

Don’t Miss: 5 Ways You’re Accidentally Committing Tax Fraud

Double Check Your Math

“When completing a return, filers should double-check all information to ensure the numbers that were entered on the form match what was reported on the tax document or receipt,” Oswalt said. “The IRS’s automated system will detect any discrepancy, and unfortunately, it does not know if it was a mistake or purposeful.”

You might want to consider using computer software to calculate your return. It would reduce your chances of making an error, and many tax software programs are free.

Get Professional Help

If your taxes are complicated or you just don’t feel comfortable doing them yourself, paying a professional for tax audit help might be a worthwhile investment. If you choose this option, you should check the preparer’s qualifications and history with the Better Business Bureau before you hire that person or firm, according to the IRS.

Retain Long-Term Financial Records

Keep IRS documents and state income tax returns for at least six years in case the IRS claims you underreported your income by 25 percent or more. Typically, the audit window is three years only, but if you underreported your gross income by 25 percent, the IRS has six years to audit you.

Invest in a Paper Shredder

To prevent identity theft, consider purchasing an inexpensive paper shredder to destroy documents that contain your Social Security number, bank account information, investment account or credit card numbers or other personal information. The IRS advises taxpayers not to throw out old returns or supporting documents.

Being Organized Pays Off

Organizing your records and storing your tax returns and bank statements for an IRS audit takes a bit of time, but it’s worth the effort. If you’re audited, you’ll have everything you’ll need at your fingertips.

If you’re notified that you’re going to be audited, it doesn’t necessarily mean you’re in trouble. Of 2015’s 1.2 million audits of individual income tax returns, nearly 40,000 resulted in taxpayers getting additional refunds to the tune of approximately $1.1 billion.

Anne Dullaghan contributed to the reporting for this article.