How Long to Keep Tax Records: A Simple Guide for California Taxpayers

Hi Friends,

Every year we are asked the same question: how long to keep tax records. It is a fair question, and the answer is not always as simple as people expect. For California taxpayers, keeping your tax returns and supporting documents for at least seven years is generally the safest approach. Below is a clear explanation of why that rule works, what records should be kept longer, and how paper and digital records are treated.

How long to keep tax records in California

For individuals and businesses subject to both federal and California tax rules, we generally recommend keeping tax records and supporting documentation for at least seven years.

This approach:

- Covers the IRS six-year rule for substantial underreporting

- Exceeds California’s minimum four-year requirement

- Provides protection if returns are amended, reviewed, or audited later

This recommendation aligns with IRS guidance on record retention and guidance from the California Franchise Tax Board. Seven years is not required in every situation, but it is a conservative best practice that helps reduce risk.

Records you should keep for at least seven years

These are the records that support the numbers reported on your tax return. If the IRS or California Franchise Tax Board ever asks how you calculated a figure, this is the documentation they will want to review.

Examples include:

- W-2s, 1099s, and other income statements

- Expense summaries and receipts

- Medical expense worksheets

- Business expense records

- Rental income and expense documentation

- Records supporting deductions or credits

If a document supports a number on your tax return, it should generally be kept for at least seven years.

Dalia in Sebastopol Phot by Melissa

Records you should keep permanently

Some records should never be discarded because they affect future tax filings or establish ownership and cost basis.

We recommend keeping these records indefinitely:

- Filed tax returns (digital copies are acceptable)

- Asset purchase and sale documents

- Depreciation schedules

- Entity formation documents

- Carryforward schedules for losses, credits, or capital losses

These records are often needed many years after the original return is filed.

Paper versus digital records: what is acceptable in California

Both the IRS and the State of California accept digital copies of tax records, as long as they are clear, complete, and accessible. Scanned PDFs and securely stored digital files are generally acceptable in place of paper originals.

The key requirement is not the format of the record, but the ability to produce it if requested. Whether paper or digital, tax records must be readable, complete, and retrievable.

"My accountant has it” and why you still need your own copy

We maintain secure digital copies of filed tax returns and the information you provide our office. However, this does not replace your responsibility to maintain your own tax records.

In many cases, clients provide summaries or worksheets rather than every underlying receipt. That means we may not have all of the backup documentation that created the totals reported on your return. Keeping your own complete records helps protect you if questions arise later.

What this means for Sonoma County individuals and business owners

For most individuals, a simple seven-year retention system works well. Business owners may have additional documents that require longer retention periods, which we can address in a separate post.

If you are unsure which records apply to your situation or want help setting up a simple retention system, our tax planning services can help you stay organized and protected.

Warmly,

Melissa Ochoa

Enrolled Agent & Owner, Apple Blossom Tax Service

Serving Sebastopol and Sonoma County