Marketplace›IRS letters›CP503
You owe a balance
Second reminder: the IRS hasn't heard from you
Respond by
Pay the entire balance by the due date shown on your notice to avoid additional penalties and interestWho sent it
IRSSource
IRS page for CP503 →Free · a report by email in minutes · no account
Upload your CP503, get a report
What this letter asks of you, what to gather, and what to ask a professional if you need one. No phone number asked.
A second reminder sent because the IRS has not heard from you and you still have an unpaid balance on one of your tax accounts.
A bill for tax, penalty or interest the IRS says is unpaid.
The IRS page describes two paths, one if you agree with the change and one if you do not. The response form that came with your letter is where you mark which one applies.
If you do not pay, make arrangements, or call, the IRS may file a Notice of Federal Tax Lien, which can affect your ability to get credit.
IRS letters arrive by mail and carry a notice number, your name and the tax year. The IRS does not open contact by text, email or social media, and does not ask for payment by gift card.
Check the notice number against the official IRS site before you respond, and respond only to the address or number printed on the official page.
A second reminder sent because the IRS has not heard from you and you still have an unpaid balance on one of your tax accounts. The IRS page for it is titled 'Understanding your CP503 notice'.
Pay the entire balance by the due date shown on your notice to avoid additional penalties and interest. The date printed on your letter controls; the IRS page for this notice is the source.
If you do not pay, make arrangements, or call, the IRS may file a Notice of Federal Tax Lien, which can affect your ability to get credit.
IRS notices arrive by mail with your name, a notice number and a tax year. Check the number on the official site before you respond, and never pay by gift card or wire on the strength of a phone call.
Not always. Upload the letter and the free report explains what it asks for and what to gather; if a professional makes sense, the report says why and what to ask. TaxScout never shares your request with any firm unless you ask for that on the report.
Want a person on this?
TaxScout lists CPAs, EAs and tax preparers from public IRS records. You choose whom to contact; nothing about your letter is shared with any firm unless you ask for that on your report.
Not tax advice. TaxScout is not the IRS. Deadlines and steps above are quoted from the IRS page linked at the top and may change; the letter in your hand controls.