Response Desk/CP501
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