4.9834 reviewsNow serving all of California
IRS CP501:here's whatit means.
Reminder: unpaid balance. A follow-up reminder that the balance from an earlier notice is still unpaid.
- “Best tax preparation service I have used. Mauricio really takes care of his clients.”Juan M.
- “Mauricio literally saved the day and was so accommodating to my last minute requests.”Christine H.
- “I don't know how I would do it without Mauricio and his team.”Rafael R.
- “Alondra is amazing! She took the time to explain everything to me in detail.”Valerie M.
- “Mauricio will educate you on how to save money on your taxes and do it RIGHT!”Chelsea J.
- “Thank you for your patience, expertise, and easygoing professionalism throughout tax season.”Danielle C.
- “Mauricio did an excellent job walking me through the tax filing process being a property owner.”Cynthia R.
- “Mauricio, is amazing! Very knowledgeable & professional.”Ron B.
- “Mauricio and his team is the Best in the tax industry!”Marisol V.
- “Professional, and easy place to get your taxes done!! Recommended.”Donald S.
- “I cant express how happy I am with Mauricio and his team.”Peter F.
- “Both Christian and Mauricio were great.”Javier P.
- “Mauricio did an amazing job helping us with our taxes.”Theresa B.
- “Mari was so knowledgeable.”Teresa
- “Mauricio and Alondra were of great help!”Drew
- “Mauricio and his team are amazing.”Lizbeth P.
What is IRS CP501?
Reminder: unpaid balance. A follow-up reminder that the balance from an earlier notice is still unpaid. Respond by the date on the notice.
Updated November 2026. Serving all of California online.
Deadline
Respond by the date on the notice.
If you ignore it
The next step is typically a notice of intent to levy.
Similar letters: CP503.
What to do now.
- 1Confirm the balance and that you received the earlier notice.
- 2Pay, or set up a payment plan, before the account moves to a levy warning.
- 3If the balance is wrong, respond in writing with documents.
General information, not legal advice. The exact deadline is printed on your notice.
Common questions.
Is IRS CP501 real or a scam?
Real IRS notices arrive by U.S. mail, not by text, social media, or a surprise phone call demanding payment. To verify, compare it with your IRS online account or call the number listed on IRS.gov, not a number from a suspicious message. We can check it for you.
Can MM.TAX respond to IRS CP501 for me?
Yes. Our practice is led by an IRS Enrolled Agent. We file a power of attorney (Form 2848), pull your transcripts, and respond to the IRS for you, online anywhere in California.
What if I can't pay what the IRS says I owe?
You have options: an installment agreement, an Offer in Compromise if you qualify, penalty abatement, or currently-not-collectible status during hardship. The right choice depends on your income, assets, and the amount owed.
IRS notices
Look up another letter.
- CP14Balance due
- CP504Notice of intent to levy
- LT11Final notice of intent to levy
- CP2000Proposed changes to your return
- CP3219ANotice of deficiency
- Letter 3172Federal tax lien filed
- Letter 566Audit or examination
- CP2501Income doesn't match your return
- CP59No record of your tax return
- CP11Changes to your return, balance due
- CP161Business balance due
- LT16Contact us about overdue taxes
- Letter 1153Trust fund recovery penalty proposed
- Form 668-ABank or wage levy
Get started
Let us handle your CP501.
Free 30-minute review with a senior advisor. Call the online team or answer a few questions.