CPA for back taxes: get right with the IRS

If you've fallen behind on filing or owe a balance the IRS has been writing to you about, you're not in unusual company. Millions of people deal with this every year, and the resolution paths are well-traveled. What matters is moving from "I'll get to it" to a concrete plan, because the IRS adds penalties and interest every month you wait, and collection actions get harder to unwind once they start. This page covers what a CPA actually does for back taxes, the resolution options in plain English, what it typically costs, and how to choose someone for IRS matters.

What you're actually dealing with

"Back taxes" is shorthand for three different problems that often overlap:

• Unfiled returns. Tax years where you didn't file at all. The IRS can file a substitute return for you (called an SFR), which uses worst-case assumptions and almost always overstates what you owe.
• Filed but unpaid balances. Returns were filed, but the balance owed wasn't paid. Interest and the failure-to-pay penalty accrue monthly.
• IRS notices and collection actions. Letters from CP14 (balance due) through CP504 (final notice) and LT11 (notice of intent to levy). Each step has a response window. Silence triggers escalation.

A CPA who handles back taxes starts by pulling your IRS account transcripts and wage and income transcripts under a Form 2848 power of attorney. That gives a complete picture of what the IRS thinks you owe, which years are missing, which W-2 and 1099 data they have on file, and what collection actions are pending. Without that baseline, every other decision is guesswork.

What a CPA actually does

The work breaks into three parts, usually in this order:

1. Filing the missing returns. Reconstructing income (often from IRS wage and income transcripts when records are lost), claiming any deductions or credits you're entitled to, and superseding substitute returns. This almost always reduces the balance the IRS thinks you owe, sometimes dramatically.
2. Negotiating the resolution. Once the real balance is established, there are four main paths: full payment if you can, an installment agreement, currently-not-collectible status if you genuinely cannot pay, or an Offer in Compromise if the math supports it.
3. Addressing penalties. First-time penalty abatement removes failure-to-file and failure-to-pay penalties for one year if you've otherwise been compliant for the prior three. Reasonable-cause abatement requires documented hardship.

Throughout all of this, the CPA is also your buffer with the IRS. With a 2848 on file, the IRS calls them, not you. That alone changes the experience.

The resolution options in plain English

Once the returns are filed and the real balance is known, one of these usually fits:

Most cases resolve through one of the installment paths. Offers in Compromise get heavy marketing from "tax resolution" firms but are accepted in roughly one of three cases nationally, and the math has to work or the IRS will reject the offer and you'll have paid for a process that didn't apply.

What it typically costs

CPA fees for back taxes are split between preparing the missing returns (priced by entity and year) and the resolution work (often priced flat or hourly). Verified 2026 ranges:

For back-tax work specifically, expect roughly $750 to $2,500 for a straightforward case (a few years of unfiled W-2 returns, simple installment plan), $2,500 to $5,000 for cases with business income or larger balances, and $5,000 to $8,000+ for Offer in Compromise engagements that require the IRS Form 656 package and supporting financial disclosure. Compare this to ongoing penalties (failure-to-file alone is 5% per month, capped at 25% of the balance) and the math usually favors resolution now over more delay.

How to choose someone for IRS matters

Representation rights are not a marketing claim. Three credentials have unlimited practice rights before the IRS: CPA, enrolled agent (EA), and tax attorney. Anyone else has limited or no rights to represent you in collections, appeals, or an exam. Before hiring, verify:

• Active CPA license on the state board of accountancy, or active EA enrollment with the IRS.
• Experience with back-tax work specifically, not just return preparation.
• Clear written fee structure: what is included, what is hourly, what is separate.
• A direct point of contact, not a call center.

The "tax resolution" industry has a long history of high-fee, low-outcome firms that advertise heavily and underdeliver. A local CPA or EA who handles a steady volume of collections work is usually a better fit at a lower price.

What to prepare before the first call

You'll need less than you think. The CPA can pull most of it from IRS transcripts once a 2848 is signed. Useful to gather:

• Every IRS notice you've received, with dates.
• Last filed tax return (if any) and the year of the last filing.
• Approximate income for each unfiled year, even rough.
• Current monthly income and necessary expenses (rent, utilities, food, transportation, medical).
• Bank statements and asset list, if a resolution beyond an installment plan is on the table.

Talk to a CPA who handles back-tax cases

We can introduce you to a CPA or EA whose practice handles back taxes regularly, usually within one business day. If you have an active IRS notice with a response deadline in the next 14 days, mention it in the note field and we'll prioritize.

Frequently asked questions

Related: IRS audit representation · how much a CPA costs · 2026 fee benchmark