If you get audited and don’t have receipts, the IRS does not automatically bill you for the full amount of every deduction on your return, but it does presume your return is wrong and puts the burden on you to prove otherwise. Federal law requires taxpayers to keep records supporting what they reported, so when those records are gone the examiner starts from the assumption that the numbers need to be adjusted.1Office of the Law Revision Counsel. 26 USC 6001 – Notice or Regulations Requiring Records, Statements, and Special Returns From there the outcome depends on what other evidence you can pull together, which categories of expenses are involved, and whether the gap looks like disorganization or something worse. Consequences range from losing a handful of deductions to a 75% fraud penalty.
What the Examiner Does When Your Records Are Gone
The auditor will not simply guess at your numbers. The IRS has formal reconstruction methods, and they tend to produce results that favor the government.
The most common tool is the bank deposits method. The examiner pulls every deposit from every account you control, subtracts items that are clearly not income (transfers between your own accounts, loan proceeds, documented gifts), and treats what remains as taxable unless you can prove otherwise.2Internal Revenue Service. IRM 4.10.4 Examination of Income The method also adds in cash expenditures that never touched your accounts. If your reported income cannot explain your known living expenses, the gap gets added to your taxable total.
For longer-term discrepancies, the examiner may use the net worth method, comparing your net worth at the start and end of the year, adding personal living expenses, and treating any unexplained increase as income. Both approaches put the burden on you to account for every dollar that flowed through your financial life during the audit period.
On the deduction side, the default rule is stark: if you cannot substantiate a deduction, the examiner disallows it. That increases your taxable income by the disallowed amount, which may push part of your income into a higher bracket.
Records That Can Stand In for Receipts
Receipts are the gold standard, but they are not the only acceptable proof. The financial trail you already have in electronic form does most of the work.
Start with bank statements and canceled checks, which show the date, amount, and payee of each transaction. Credit card statements go a step further by categorizing the merchant. Together they link your money to specific vendors and dates, which is most of what an auditor needs to verify a claimed expense.
Layer context on top of the payment records. Calendars, appointment books, and email correspondence help establish business purpose. If you paid a graphic designer $2,000 in March and your calendar shows three client-related design meetings that month, the auditor can connect the dots. You can also ask vendors and service providers for signed statements, under penalty of perjury, confirming what you bought and when. Presenting everything in chronological order makes the examiner’s job easier, which generally works in your favor.
Digital records carry the same weight as paper. The IRS has accepted electronically stored documents since Revenue Procedure 97-22, provided the images are legible, readable, and stored on a system you can access during the exam.3Internal Revenue Service. Revenue Procedure 97-22 Scanned receipts, photos of invoices, and cloud-based accounting records all qualify, as long as the system prevents unauthorized alterations and you can produce hard copies on demand.
When You Can Estimate an Expense
A 1930 federal appeals court decision, Cohan v. Commissioner, created a fallback for taxpayers who can show they spent money for a legitimate business purpose but cannot produce the exact receipt. Under the Cohan rule, the auditor or court can allow a reasonable estimate of the expense rather than wiping it out entirely.
The catch is that you need a factual basis for the estimate. “I spent about $5,000 on supplies” with nothing behind it will not work. Examiners look for corroborating details: what the expense was for, roughly when it happened, and why the amount is plausible given your line of work. Credible testimony matters, but testimony alone rarely carries the day. You strengthen a Cohan-based estimate by pairing it with anything concrete: a bank statement showing a payment near the claimed date, a calendar entry, an email confirming a purchase. The less precise your records, the lower the estimate the IRS accepts, and that discount can be steep.
Categories Where Estimates Are Not Allowed
Congress carved out specific expenses that require strict documentation, with no estimates permitted. Under Section 274(d) of the Internal Revenue Code, you must substantiate the amount, time, place, and business purpose of any traveling expense (including meals away from home), business gifts, and listed property such as vehicles used partly for personal purposes.4Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses Without a contemporaneous log or receipt, the examiner must disallow the deduction entirely. Testimony cannot override the statute.
Entertainment expenses are a separate matter: the Tax Cuts and Jobs Act of 2017 eliminated the deduction for entertainment, amusement, and recreation, so there is nothing to substantiate. If your return claimed entertainment deductions, the auditor will strip them whether you have receipts or not.
What You’ll Actually Owe
Once the examiner finishes adjusting your return, the IRS issues Form 4549, the Income Tax Examination Changes report, spelling out exactly what you owe.5Internal Revenue Service. IRM 4.10.8 Report Writing The damage comes in three layers.
The first is the additional tax itself, driven by the disallowed deductions. One floor is worth knowing: even if every itemized deduction is stripped away, you still get the standard deduction. For 2026 that is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.6Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 You are not starting from zero.
The second layer is interest, charged from the original due date of the return rather than the date of the audit. The rate adjusts quarterly based on the federal short-term rate plus three percentage points. For the first quarter of 2026 the rate is 7% per year, compounded daily.7Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 On a return from two or three years back, the accumulated interest alone can add thousands.
The third layer is penalties. The most common one for missing documentation is the 20% accuracy-related penalty under Section 6662, which applies when the underpayment results from negligence or from a substantial understatement of tax. A substantial understatement exists when the underpayment exceeds the greater of 10% of the tax that should have been reported or $5,000.8Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments The 20% is calculated on the portion of the underpayment tied to the violation, not on your whole tax bill, but combined with interest and additional tax, the total can easily double or triple the original amount owed.
Reducing the Penalty With Reasonable Cause
The 20% accuracy penalty is not automatic. Under Section 6664(c), no penalty applies if you can show reasonable cause for the underpayment and that you acted in good faith.9Office of the Law Revision Counsel. 26 USC 6664 – Definitions and Special Rules Many taxpayers pay the penalty without realizing they had a viable defense.
The IRS looks at your specific circumstances: what efforts you made to report correctly, how complex the issue was, your education and experience with tax matters, and whether you sought professional help.10Internal Revenue Service. Penalty Relief for Reasonable Cause Records destroyed in a fire, flood, or other disaster are classic reasonable cause scenarios. Reliance on a competent tax professional who had all the relevant information can also qualify, though the IRS is skeptical when the taxpayer did not give the preparer complete records.
Arguments that generally fail include not knowing the law, simple carelessness, and lack of funds. The analysis is case-by-case, and raising the issue costs nothing. If the examiner rejects your reasonable cause argument during the audit, you can raise it again on appeal.
When Missing Records Look Like Fraud
Most taxpayers who lose receipts are disorganized, not dishonest. But missing records are one of the recognized fraud indicators, and the gap between “sloppy recordkeeper” and “suspected fraud” is narrower than most people think. Examiners look for patterns: destroying books after the audit starts, keeping multiple sets of books or none at all, unexplained large currency transactions, and a lifestyle that far outpaces reported income.11Internal Revenue Service. IRM 25.1.2 Recognizing and Developing Fraud
If the examiner concludes any part of your underpayment is due to fraud, the penalty jumps to 75% of the fraud-related portion, and the burden shifts. Once the IRS establishes that any portion is fraudulent, the entire underpayment is presumed fraudulent unless you prove otherwise by a preponderance of the evidence.12Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty A fraud finding can also open the door to a criminal referral, though that is uncommon in routine audits. Cooperate fully, answer questions honestly, and never destroy or hide documents once an audit begins.
How Far Back the IRS Can Go
The standard audit window is three years from the date you filed. Missing or inaccurate records can extend that window. If you omitted more than 25% of your gross income, the IRS has six years to assess additional tax. If the return was fraudulent or you never filed, there is no time limit.13Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection
These rules should shape your record retention. The IRS recommends keeping supporting records at least three years after filing, six years if there is any chance you underreported gross income by more than 25%, and indefinitely if you filed a fraudulent return or did not file at all.14Internal Revenue Service. How Long Should I Keep Records A practical minimum for most people is seven years.
If You Disagree With the Result
An unfavorable audit is not the final word. Each stage of the process gives you a fresh chance to present evidence.
The 30-Day Letter and Appeals
After the examiner proposes changes, you receive a letter explaining your right to appeal. You generally have 30 days to file a written protest with the IRS Independent Office of Appeals.15Internal Revenue Service. Preparing a Request for Appeals Appeals is separate from the examination division and can settle cases based on the hazards of litigation, meaning how likely the IRS would be to win in court. If you’ve gathered better documentation since the audit closed, this is a strong venue to present it.
Notice of Deficiency and Tax Court
If Appeals doesn’t resolve the case, or you skip that step, the IRS issues a Notice of Deficiency, sometimes called the 90-day letter. You have 90 days from the date on the notice (150 days if you are outside the country) to file a petition with the U.S. Tax Court.16Internal Revenue Service. Understanding Your CP3219N Notice Filing stops the IRS from collecting the disputed amount until the court rules. The deadline is absolute. Miss it by one day and you lose the right to challenge the assessment in Tax Court before paying.
Audit Reconsideration
If the audit closed without your participation, or you later find records that were not available before, you can request an audit reconsideration. It is available when you never appeared for the original audit, you have new documentation the examiner did not see, or you disagree with the assessed tax. Submit the request in writing with the new evidence attached, and expect an initial response within about 30 days.17Taxpayer Advocate Service. Audit Reconsiderations The IRS can issue a revised assessment if the new evidence changes the outcome, but collection activity may continue while the review is pending unless the original assessment was clearly flawed. Success turns on the quality of the records you bring.