Founders & Small BusinessFree tool
State Agency Notice Response and Deadlines
Every deadline on your state notice as a calendar date, the amount checked against your records, and a drafted response to review.
Free to start · Opens in your River workspace, ready to edit and share
How to respond to a state tax notice
To respond to a state tax notice, turn its deadline into a date, then check every figure against your own records. If the notice is right, pay it. If it isn't, file a signed, written protest (some agencies call it a petition) by that date. A good one names the notice, says which amounts you accept and which you dispute, and backs each dispute with a reason and a document.
Start with the date, not the amount. California's Franchise Tax Board, for one, says a proposed assessment you don't protest in time becomes final and billable1. After that, the way to argue is to pay in full and file a claim for refund.
Read the state tax notice for five things
Read every page the day it arrives, including the back and any schedules. Before you react to the amount, find five things.
- Who sent it: the agency, the tax and your account number
- The period it covers, such as the quarters audited
- What it claims: tax, penalty and interest, listed separately
- The date printed on it, and any respond-by date
- Your rights: whether it offers a protest, a petition or an appeal
The last item matters more than the notice's name. New York, for example, gives no protest rights for a bill caused by a math error on your return2 or by an IRS change to your federal return. For those, you can only ask for a review.
Read a letter from a state labor department or licensing board the same way. If a labor agency says your contractors are employees, test that with a worker classification check before you answer. An IRS letter follows federal rules, which the IRS notice response covers.
Turn the deadline into a date
Your time to respond usually runs from the date the agency mailed the notice, normally the date printed on it, not the day you opened it. Count calendar days: a notice dated March 2 with a 30-day window needs an answer by April 1, even if you opened it on March 10.
How long you have to dispute a state tax notice
| Notice | Time to dispute it | If you miss the deadline |
|---|---|---|
| California sales and use tax: Notice of Determination | 30 days from the date it was mailed3 | It becomes final and due. You can still pay, then claim a refund. |
| California income or franchise tax: Notice of Proposed Assessment | 60 days4, shown as a Protest By date | It becomes a bill. You can still pay in full, then claim a refund. |
| New York sales tax (Notice of Determination) or income tax (Notice of Deficiency) | 90 days from the date it was mailed5 to petition for a hearing, with no extension | You can only ask the department to review it. |
Examples checked in October 2026. Follow the deadline on your own notice.
Calling the agency doesn't stop the clock
New York warns that asking for a review or contacting the department does not extend your time to file a protest2. File by the date anyway.
Check the amount against your records
Treat the figure as the agency's estimate, built from what it could see. Divide the tax by the rate to find the base it taxed, and compare it with your returns for each period. If the base matches your total sales, the agency treated every sale as taxable.
Then look for what the agency couldn't know: sales for resale, exempt sales, goods shipped out of state, payments already made and sales from another period. If your sales records are thin, rebuild the period from bank deposits. A bank statement converter turns PDF statements into rows you can total.
Proving those sales is usually your job. In California, a seller must prove a sale wasn't retail unless it took a resale certificate from the buyer on time and in good faith6. A certificate collected later isn't retroactive. You'd need other proof that the buyer resold the goods, such as the customer letters the rule calls XYZ letters.
Handle penalty and interest separately
A penalty can be removed even when the tax stands, but you have to ask. CDTFA, California's sales tax agency, may grant relief when a late filing or payment was due to reasonable cause and circumstances beyond your control7. It may not process the request until the tax is paid in full. Write down what happened, when, and what you did about it.
Interest is harder to remove, and it keeps running during a dispute. CDTFA relieves it only in narrow cases, such as an unreasonable error or delay by its own staff. Paying stops it. CDTFA lets you pay some or all while your appeal is pending3, though refunds earn a much lower rate than it charges on unpaid tax.
Whatever you dispute, pay the part you agree with now to stop its interest. The Franchise Tax Board also takes a tax deposit4 that stops interest while you protest.
Write the response point by point
Use the agency's online account or form if it has one; otherwise, write a letter. The Franchise Tax Board wants the amounts you protest and any amounts you accept1, your reasons, your documents and a signature. CDTFA's petition rules3 are much the same.
Name the notice
Your name and account number, plus the notice's number, tax, period and date. Enclose a copy.
Say what you accept
List the amounts you agree with, and note any you have already paid.
Dispute the rest, item by item
One paragraph per adjustment, largest first, each with its reason and the attachment that proves it.
Ask for a specific result
The corrected tax, penalty relief or a payment plan, not a vague request for review.
Re: Protest of Notice of Proposed Assessment No. 000-123456, sales and use tax, 2024 and 2025, dated March 2, 2026
We accept the $320 of tax on $4,000 of craft fair sales we failed to report, and paid it today.
We dispute the remaining $12,000. The audit treated $150,000 of sales to two gift shops as retail sales, but both bought our pottery to resell. Their resale certificates predate their first orders (Attachments 1 and 2), and every invoice to them is marked "for resale" (Attachment 3).
Please reduce the proposed tax to $320 and recompute the penalty and interest on that amount.
Dana Reyes, owner, Blue Heron Ceramics. Questions: (555) 010-0142.
- Names the notice. The number, tax, period and date let the agency find your file.
- Concedes the real error. Admitting the $320 makes the rest easier to believe.
- Asks for a number. It names the corrected tax rather than asking for a review.
Send it, then track every date
File online if the agency allows it; the Franchise Tax Board calls that the fastest way to protest1. If you mail it, use a service that proves the mailing date, and keep a copy of everything.
Expect a letter confirming receipt, and call if none comes within a few weeks. Later stages have their own deadlines, often 30 days from the next letter's date, so log every notice. To head off the next one, keep your filing dates in a small business compliance calendar.
Before you send your response
- The deadline is counted from the date on the notice
- The notice number, tax, period and date are at the top
- Amounts you accept are listed, and paid if you can
- Each disputed amount has a reason and a numbered attachment
- It is signed, with a contact name and phone number
- You have a copy and proof of the date you sent it
When to bring in a professional
Bring in an accountant or tax attorney if the amount is large, the audit covers several years, a fraud penalty appears or the deadline is days away. This guide is general information for US readers, not legal or tax advice.
The tool at the top of this page does this groundwork for you: dated deadlines, the amount rebuilt from your records and a draft response to check and send.
How it works
Start by pasting the notice or adding a photo of every page, then list the records you have for that period. River reads the notice, turns each deadline into a calendar date and says what you lose if it passes. If the notice doesn't state its protest window, River looks up the agency's own rule and cites it. Then it rebuilds the amount from your records and drafts the response in your workspace.
The same method works for a letter from a state labor agency or a licensing board. River marks anything it can't confirm instead of guessing and never contacts the agency for you. When the amount is large, it says an accountant or tax attorney should review the response first.
Share the notice
Paste the notice or add a photo of every page, then list the records you have for the period.
River checks it
It turns each deadline into a date, finds the base the agency taxed and rebuilds the amount.
Get your response
A drafted reply with its attachment list, a reconciliation sheet and a log of every deadline.
Review, then send
Edit it, ask River for changes or a brief for your accountant, then send it yourself.
What you get
- Every deadline on the notice as a calendar date, with what you lose if it passes
- The base the agency taxed, worked out from its own figures and compared with your returns
- A reconciliation sheet: the agency's figure beside yours, one adjustment per row with its proof
- Penalty and interest handled apart from the tax, with the facts that may support penalty relief
- A drafted response that accepts what's right, disputes the rest item by item and asks for a result
- A notice log with each agency, notice number, real deadline and follow-up date, ready to share
Common questions
How long do I have to respond to a state tax notice?
It depends on the state and the type of notice, so go by the date on yours. California gives 30 days to dispute a sales tax determination and 60 days for a Franchise Tax Board proposed assessment. New York gives 90 days to dispute a Notice of Determination or Notice of Deficiency. Windows usually count from the date the notice was mailed, not the day you opened it.
What happens if I miss the deadline?
Usually the proposed amount becomes final and due, and collection can follow. You may still be able to pay in full and then file a claim for refund, as California allows. But by then you are arguing with your money already gone. Call the agency at once and ask what review is still open to you.
Can I pay the notice and still dispute it?
Often, yes, and paying stops the interest. New York lets you pay at any time and keep your protest going. California's Franchise Tax Board takes a tax deposit for the same purpose. CDTFA lets you pay some or all while your appeal is pending, without treating the payment as an admission. Follow the agency's payment instructions so the money lands on the right notice.
Can I get the penalty removed?
Sometimes, if you can show reasonable cause, and you usually have to ask for it separately from the tax. Describe what happened and when, what you did once you knew, and the records that show it. Interest is harder: California's sales tax agency relieves it only in narrow cases, though interest shrinks when the tax it is charged on is reduced.
Do I need an accountant or a lawyer to respond?
Not always. You can often answer a notice about a missing form or a math error yourself, with the right documents. Audits are different. When the sum is large, the adjustments go back several years or the notice adds a fraud penalty, have an accountant or tax attorney check your response first. With the agency's power of attorney form signed, they can deal with the agency for you.
How do I draft a notice response with River?
Paste the notice or add a photo of every page in the box at the top of this page, then list the records you have for that period. River turns each deadline into a date, checks the amount against your records and drafts the response, a reconciliation and a notice log in your free River workspace.
Is the state agency notice response tool free?
Yes, it is free to start. Your notice response opens in a River workspace, where you can edit it, share it with your accountant or ask River to change it. Paid plans add more AI use and access to the most advanced models.
Sources
California Franchise Tax Board. “Disagree with an NPA (Protest).” ftb.ca.gov (opens in a new tab)
New York State Department of Taxation and Finance. “Disagree with a bill or action.” tax.ny.gov (opens in a new tab)
California Department of Tax and Fee Administration. “Appeals Procedures: Sales and Use Taxes and Special Taxes and Fees (Publication 17).” cdtfa.ca.gov (opens in a new tab)
California Franchise Tax Board. “Notice of Proposed Assessment.” ftb.ca.gov (opens in a new tab)
New York State Division of Tax Appeals. “Frequently Asked Questions.” dta.ny.gov (opens in a new tab)
California Department of Tax and Fee Administration. “Regulation 1668. Sales for Resale.” cdtfa.ca.gov (opens in a new tab)
California Department of Tax and Fee Administration. “Request Relief.” cdtfa.ca.gov (opens in a new tab)
Built by
Chandler Supple
Co-founder & CEO, River
Chandler has spent the last six years working in AI, building tools for millions of users and Fortune 100 companies. In 2025, he co-founded River to build a new kind of operating system for AI agents.