How long do you have to keep accounts payable invoices, and is a scanned copy enough for an IRS or financial audit?

There is no single universal number for accounts payable (AP) invoices, but the question really has two parts: how long must you keep them, and will an image stand in for the paper.

How long to keep AP invoices

AP invoices are part of the documentation that supports the figures on a tax return, so their retention is usually driven by tax and audit rules rather than by a fixed “invoice” rule. As a practical baseline, the IRS advises keeping records that support income, deductions, or credits until the period of limitations for that return runs out. For many businesses that period is commonly framed as around three years, but it extends further in specific situations — for example, longer when a substantial understatement of income is involved, and indefinitely if a return is fraudulent or never filed.

Because of those longer tails, many organizations adopt a conservative AP retention period (often in the six-to-seven-year range) and set it in a formal retention schedule. Other obligations can also reach AP records — contract or warranty terms, grant requirements, state tax rules, and litigation holds — so the controlling retention period is the longest one that applies.

Is a scanned copy enough

In general, yes. Tax and financial-audit practice has long accepted properly produced electronic records, and the IRS expects electronic records to be as complete and accessible as the paper originals would have been. A scan is acceptable when you can demonstrate that it:

• is a complete, legible, and accurate reproduction of the original;
• is captured under a documented, consistent imaging process;
• preserves key metadata (dates, amounts, approvals) and is indexed so a specific invoice can be located and reproduced on demand;
• is protected against alteration and stored with reliable backups for the full retention period.

What auditors care about is reliability and integrity, not the medium. Following recognized imaging and quality guidance helps you defend that the image faithfully represents the source document.

Practical takeaways

• Set the retention period from your schedule, using the longest applicable rule, rather than guessing.
• If you digitize and then destroy paper, document the process in a written policy so the images are trusted evidence.
• When destruction of originals carries unusual legal risk, confirm with counsel or your tax advisor first.

For broader guidance on imaging programs and quality, see the digitization and imaging topic hub.