Is it the same as CP59?

Related lane, typically more escalated — read your letter.

Can I handle it without hiring anyone?

Often yes — file, prove filed, or explain per the notice.

What if the IRS already filed a substitute return?

Ask for clarity via the IRS Notice Decoder (https://leads.carosgroup.com/irs-notice-decoder) or call (256) 690-0213 — no guaranteed IRS result.

Is a CP518 the same as a CP59?

They are on the same unfiled lane. CP518 is typically more escalated — read your letter carefully.

How long do I have to respond to a CP518?

Use the date printed on your CP518. Do not rely on a website guess.

Can I handle a CP518 without hiring anyone?

Often yes. File, prove you filed, or follow the notice instructions to explain.

What if the IRS already prepared a substitute return?

Ask for a plain-language read via the decoder or call (256) 690-0213. Caros Group does not guarantee any IRS outcome.

Tax Resolvers - Caros Group

CP518

Unfiled returns · Escalating

IRS CP518 notice — plain-language guide

Q: What is an IRS CP518?

Usually a later unfiled-return notice seeking a return or explanation.

A CP518 usually means the IRS is escalating about missing returns — they may prepare a substitute for return if you do not file. Start with the years listed on your letter.

We help with unfiled returns / filing, audits, and tax debt. No appointment required.

Use the Free IRS Notice Decoder

or call (256) 690-0213 · [email protected]

What this notice usually means

An escalating unfiled-return notice. The IRS is asking you to file (or explain) the year(s) shown — and may file a substitute return if you do not.

Urgency: Important for the unfiled path: the IRS may prepare a substitute return for a missing year.

What happens next

A calm path — your letter controls the details.

List missing years

Use the years on your CP518.

Gather records

W-2s, 1099s, prior returns if any.

File or get a path

File the missing years yourself, or use the Free IRS Notice Decoder for a next step.

Deadlines & what you can do

Use any date on your letter. Filing (or documenting why a year is not required) usually beats waiting for a substitute for return.

Confirm which years the IRS says are missing.
Collect income docs; do not invent figures.
If you already filed, call the number on the notice with proof.
If you cannot file alone, use the Free IRS Notice Decoder or email [email protected].
Crop SSN on any photos you share.

Helpful when multiple years are missing, you received CP59 then CP518, or you also owe balances. Start with the Free IRS Notice Decoder, or call (256) 690-0213 (an automated voicemail that texts you a link) or email [email protected].

Related notices

CP59

Unfiled returns

Often earlier unfiled letter.

Learn More

CP14

First balance-due bill

Unpaid path (different).

Learn More

CP504

Intent to levy path

Collection path if balances.

Learn More

HUB

All notices

Full notice guide list.

Learn More

← All IRS notice guides · Free IRS Notice Decoder

Common questions

What is an IRS CP518?Usually an escalating notice about unfiled returns — the IRS may file a substitute for return if you do not.

Is CP518 the same as CP59?Related unfiled lane. CP518 often feels more urgent / escalating than an earlier CP59.

Will the IRS file for me?They may prepare a substitute for return. That may limit your options over time, so filing accurate returns when you can is worth considering.

Do I need an appointment?No. Start with the Free IRS Notice Decoder or email [email protected].

Can you tell me how the IRS will respond?No. IRS outcomes depend on your records and the IRS review, and Caros Group does not guarantee any IRS outcome.

Need help understanding your notice?

Start with the Free IRS Notice Decoder. Booking is optional — or call / email anytime.

Use the Free IRS Notice Decoder

(256) 690-0213 · [email protected]

Oct 15 · seasonal

Still need returns filed before Oct 15?

If unfiled years are part of the problem, start with calm filing help — a plain-language read and a path forward. Caros Group does not guarantee any IRS outcome. Booking optional.

Unfiled returns help →

Caros Group - Tax Resolvers · Huntsville, Alabama