IRS Notice CP501 · Balance Due Reminder

A CP501 is a reminder — the balance hasn't been resolved.

CP501 follows an earlier CP14 that wasn't paid or answered. The amount is the same balance plus added interest. It's still early enough to resolve cleanly.

21–30 days

Typical deadline

Tier 1

$295

15 min

Free triage call

Book a triage call All notice types

What it is

What a CP501 actually means

A CP501 is the IRS's reminder notice that an unpaid balance remains on your account. It restates the amount due and the interest and penalties that continue to accrue.

It is one step further down the collection sequence than a CP14, but still well before levy action. Resolving it now — by payment, an installment agreement, or correcting an error — stops the escalation to CP503 and CP504.

Why you might have received one

A CP14 went unpaid or unanswered
A payment was sent but misapplied
An installment agreement wasn't formally set up
Penalty and interest were added since the first notice

What's at stake

Ignored, a CP501 leads to CP503, then CP504 (intent to levy). Interest keeps compounding. Acting now keeps the cheapest options — payment plans and penalty abatement — on the table.

Common mistakes we see

Assuming a mailed payment will resolve it without confirming it posted
Skipping a check for first-time penalty abatement eligibility
Letting it roll to CP504 before responding
Paying a balance that's actually the result of a misapplied payment

Transparent, flat-fee pricing

You'll know the cost before we start

No hourly surprises on routine notices. We confirm the tier on your free triage call and put the fee in writing.

Tier 1

$295 flat fee

Simple notices

CP501, CP14, balance-due reminders
Notice review & deadline confirmation
One drafted response letter
Filed on your behalf

Tier 2

$595 flat fee

Underreporter & matching

CP2000, CP2030, AUR notices
Line-by-line reconciliation
Substantiation package assembled
One free follow-up within 90 days

Tier 3

from $1,495 scoped quote

Urgent & high-stakes

CP3219A, CP504, Letter 226-J
Tax Court petition support
Penalty abatement requests
Direct IRS / DOR representation

Tier 4

$350 per hour

Examination & appeals

Full audit representation
Appeals conferences
Complex multi-year matters
Quoted in writing before work begins

Common questions

Before you call us back, read this

How is a CP501 different from a CP14?

A CP14 is the first bill. A CP501 is the reminder that it's still unpaid. Same balance, more accrued interest, one step closer to collection.

Can I still get the penalty removed?

Often yes, through first-time abatement if your compliance history is clean. We check eligibility as part of the response.

What if the balance is wrong?

We confirm the figure against your records and payment history. Misapplied payments are a common cause and are correctable.

What does the $295 fee cover?

Notice review, balance and payment verification, a drafted response or payment-plan setup, and filing on your behalf.

Respond to your CP501 the right way

Book a free 15-minute triage call. We'll identify the notice, confirm your deadline, and quote the work in writing — no obligation.

Book a free 15-minute triage call