California FTB Notice Notice of Tax Return Change (FTB 5818)
California FTB Notice Notice of Tax Return Change (FTB 5818) means California wants a specific tax issue addressed. Read the tax year, the deadline, and the requested action before sending records or money.
This page was checked against the California FTB notice list supplied for this project and public FTB guidance, including FTB notices and letters, FTB response guidance, MyFTB, Notice of Tax Return Change. The notice itself controls. If the letter in your hand gives a different address, phone number, portal instruction, or deadline, use the instruction on the letter.
Why California sent California FTB Notice Notice of Tax Return Change (FTB 5818)
FTB lists California FTB Notice Notice of Tax Return Change (FTB 5818) as a California notice or letter. FTB uses this type of notice when it changes or corrects a return during processing. The notice should show the reason code or explanation for the adjustment.
Why Notice of Tax Return Change (FTB 5818) should not sit unanswered
California FTB Notice Notice of Tax Return Change (FTB 5818) matters because California notices rarely disappear on their own. Even when the letter is low risk, the taxpayer needs a dated copy, a record of the response, and proof that the issue was closed.
What some taxpayers review before answering Notice of Tax Return Change (FTB 5818)
Some taxpayers address California FTB Notice Notice of Tax Return Change (FTB 5818) by putting the notice, the California return, the federal return, payment records, income documents, prior notices, and any online FTB account history in one folder before answering. That sounds boring. It works. A clean folder keeps the response from turning into a scavenger hunt. The response should be narrow. For California FTB Notice Notice of Tax Return Change (FTB 5818), answer the question FTB asked. Do not turn a simple notice into a full life story.
How The Reed Corporation helps with Notice of Tax Return Change (FTB 5818)
The Reed Corporation has experience helping taxpayers and business owners deal with California FTB notices, IRS notices, filing questions, refund issues, audit letters, and state collection problems. For California FTB Notice Notice of Tax Return Change (FTB 5818), we focus on the facts first. What did FTB ask for? What records prove the answer? What deadline controls the next move? Our work can include notice review, return comparison, document organization, response planning, and follow-up tracking. The goal is a response that is easier for the agency to process and easier for the taxpayer to defend later.
Accuracy note
California changes forms, online tools and letter procedures over time. This post uses the public FTB notice list and related FTB pages available during this content pass. It does not replace the notice in your hand, and it is not legal advice. The actual letter, the tax year, the taxpayer facts, and the current FTB account transcript matter most.
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Sources & References
Frequently Asked Questions
What is the FTB 5818 Notice of Tax Return Change and what should I do first?
The FTB 5818 is California’s formal notice telling you the Franchise Tax Board changed something on your state tax return and that you now owe additional tax — or that your refund has been reduced. Unlike an audit, this is a one-sided adjustment the FTB made based on information already in its records or an automatic error-correction process. The notice explains what was changed and shows the revised tax calculation. You have 30 days to pay or respond.
The most important thing to do first is compare the FTB’s calculation to your original return line by line. The notice will specify which items were changed — common adjustments include correcting math errors, disallowing credits that didn’t qualify, adjusting income to match W-2 or 1099 data the FTB received, or conforming your California return to the IRS’s examination results. Some adjustments are right and you owe the money. Others are wrong.
At The Reed Corporation, we treat every FTB 5818 as a potential dispute until we’ve verified the math. Sometimes the FTB has applied the correct income figure to the wrong line. Other times they’ve disallowed a credit the taxpayer legitimately qualifies for. We review the notice against the original return and either confirm the balance due or prepare a formal response challenging the adjustment.
Why did the FTB change my California tax return without asking me?
The FTB has authority under California Revenue and Taxation Code Section 19032 to correct math errors and Section 19057 to make assessments based on information returns without a full audit. When you file your return, the FTB runs it through automated checks that compare your reported income against W-2s, 1099s, and other information returns filed by payers. If your numbers don’t match, the FTB adjusts your return and issues the 5818 — no prior notice required.
A federal adjustment triggers a mandatory California adjustment under Revenue and Taxation Code Section 18622. If the IRS changed your federal return — through an audit, a CP2000 notice, or a correspondence examination — you’re required to report that change to California within six months. If you didn’t, California found out through IRS data sharing and made the adjustment on your behalf, issuing the 5818 to notify you and bill you for the California impact.
California also makes conformity adjustments when your California return doesn’t properly account for differences between federal and California law — depreciation differences, capital loss limitations, and net operating loss carry-forward rules all differ. These adjustments can happen years after you filed if California discovers the discrepancy during its routine processing.
I disagree with the FTB 5818 adjustment — how do I dispute it?
If you disagree with the FTB 5818, you have 30 days from the notice date to file a written protest. Your protest needs to be specific — identify each item you’re disputing, explain why the FTB’s calculation is wrong, and include supporting documentation. A general statement that you disagree isn’t enough. The protest goes to the FTB’s Resolution and Compliance Bureau, and you can request an informal conference if you want to discuss the issues with an FTB representative by phone.
If the protest is denied or partially denied, your next step is an appeal to the California Office of Tax Appeals (OTA). You have 30 days from the protest decision to file an OTA appeal. The OTA is an independent body — separate from the FTB — that conducts formal hearings. For amounts under $5,000, you can elect to use the Small Case program, which has simpler procedures and doesn’t require an attorney. For larger amounts, having a CPA or tax attorney represent you at the OTA makes a real difference.
Missing the 30-day protest deadline is the most common and most costly mistake we see. Even if you plan to pay the balance eventually, filing a timely protest preserves your rights. We file protests for clients at The Reed Corporation even in cases where we think the FTB might be partially right — it keeps options open and often leads to negotiated resolutions that are better than the original notice.
How does a federal IRS audit result affect my California FTB 5818?
When the IRS changes your federal taxable income through an audit or examination, California expects you to report that change within six months of the federal assessment date under Revenue and Taxation Code Section 18622. You do this by filing an amended California return (Form 540X) or by notifying the FTB in writing. If you don’t self-report, the FTB will find out — the IRS shares examination results with state tax agencies through federal-state data exchange agreements.
When California picks up the federal change on its own and issues the FTB 5818, it doesn’t just mechanically apply the federal adjustment. California starts from the IRS’s revised federal AGI, then applies California-specific adjustments — items California doesn’t conform to federally, like bonus depreciation differences or SALT deduction limitations. The California additional tax from a federal audit is often larger or smaller than a simple percentage calculation would suggest.
The timing is important too. California’s normal statute of limitations for assessment is four years from the return filing date, but for a federally adjusted item, the FTB has the later of four years or one year after the federal change becomes final. We handle federal-to-California conformity filings after IRS examinations and know how to present the California calculation correctly to minimize additional exposure.
Do I have to pay the FTB 5818 balance immediately or can I set up a payment plan?
You don’t have to pay the full FTB 5818 balance immediately if it’s a financial hardship. California offers installment agreements — formally called Installment Payment Agreements — that let you pay over time, typically up to 60 months. To request one, you can apply online through MyFTB or by calling 800-689-4776. Interest continues to accrue on unpaid balances during the installment period, currently at 7% annually, but the agreement stops collection action while you’re making payments.
One thing many people don’t know: paying the balance in full or entering an installment agreement doesn’t waive your right to dispute the underlying tax if you think the FTB 5818 was wrong. You can pay under protest and simultaneously file a claim for refund within four years of the payment date under Revenue and Taxation Code Section 19306. This is actually the recommended path when you want to stop interest from running but still believe you don’t owe the amount.
For balances over $10,000, the FTB may require financial disclosure forms before approving an installment agreement. And if the balance is under $10,000 and you’ve filed on time in prior years, the FTB typically approves installment agreements quickly without extensive review. We help clients work through both the installment agreement process and simultaneous protest filings so nothing gets waived unintentionally.