What Happens If You Ignore an IRS CP501 Notice?
If you need the full explanation, read this first: IRS CP501 Notice Explained.
What Happens Next?
- CP503 – more urgent reminder
- CP504 – intent to levy warning
Do Penalties Increase?
Yes. Interest and penalties continue to grow until the balance is paid.
Can the IRS Take Action?
Not immediately at CP501 stage, but continued inaction can lead to enforcement actions.
Can You Still Fix It?
Yes. You can still pay or set up a plan.
See how here: How to respond to CP501.
Bottom Line
Ignoring CP501 makes the situation worse over time. Acting early is the best option.
Disclaimer: Informational only.

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25 years of experience managing tax, accounting, payroll, and employment-related information portals. Editor of Accounting Portal since 2011.
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