PART V – How the IRS Calculates

Most tax relief writing describes programs. This part shows the arithmetic behind them — how Reasonable Collection Potential is built, how allowable expenses are determined, how penalties and interest accrue, and how the collection statute is computed. These are the numbers a Revenue Officer, offer examiner, or Appeals officer is actually working from.

Reasonable Collection Potential

Reasonable Collection Potential is the IRS’s estimate of what it can collect before the collection statute expires. It determines whether an Offer in Compromise is acceptable, what an installment agreement payment will be, and whether a taxpayer qualifies for Currently Not Collectible status.

RCP = Net realizable equity in assets + Future remaining income

Allowable Living Expenses

The IRS does not accept a taxpayer’s actual spending as the measure of what they can afford. It applies Collection Financial Standards, which cap most categories at a national or local figure regardless of what the taxpayer actually spends.

Collection Financial Standards are published by the IRS and updated annually; housing and transportation figures vary by county and region. Figures shown are current as of publication (August 2026). Dollar thresholds, penalty minimums, interest rates, and allowable expense standards are adjusted periodically — verify the current figure before relying on it.

Penalties

Penalties are computed mechanically. Knowing the rate structure lets a taxpayer see what portion of a balance is penalty — often a third or more — and whether abatement is worth pursuing.

Penalty Relief: What Changed in 2026

On July 8, 2026, the IRS announced the Automatic Exemption from Penalty (AEP) program, which replaces the long-standing First Time Abate administrative waiver. Under AEP the IRS evaluates compliance history during return processing and suppresses qualifying failure-to-file, failure-to-pay, and failure-to-deposit penalties automatically — no request, no phone call, no form. Eligibility generally mirrors the old standard: timely filing and payment for the prior three years, or twelve consecutive quarters for quarterly filers.

The transition is phased. AEP applies to eligible original returns beginning with tax year 2025 and 2026 quarterly returns, and fully replaces First Time Abate for returns with original due dates on or after January 1, 2027. During the transition, qualifying taxpayers may still receive penalty notices before programming is complete — in that situation, First Time Abate should still be requested under existing procedures rather than assumed to have been applied.

Two points that have not changed: reasonable cause relief under IRC § 6651 is a statutory remedy and is unaffected by AEP, and neither program removes the underlying tax or the interest on it.

Interest

Interest is not a penalty and is not abatable except in narrow circumstances involving IRS error or delay. It is set quarterly under IRC § 6621 and compounds daily under § 6622.

Rates reset quarterly. Interest runs from the original due date of the return — not from the assessment date, and not from the date a payment plan is approved. Figures shown are current as of publication (August 2026). Dollar thresholds, penalty minimums, interest rates, and allowable expense standards are adjusted periodically — verify the current figure before relying on it.

Installment Agreement Tiers

Setup fees range from roughly $31 for an online direct-debit agreement to $225 for a manual agreement established by phone or mail; reduced or waived fees apply to low-income taxpayers. Direct debit is generally required above $25,000 to avoid a Notice of Federal Tax Lien. Figures shown are current as of publication (August 2026). Dollar thresholds, penalty minimums, interest rates, and allowable expense standards are adjusted periodically — verify the current figure before relying on it.

The Collection Statute Expiration Date

Under IRC § 6502, the IRS generally has ten years from the date of assessment to collect. Each assessment carries its own clock, so a taxpayer with six years of liabilities has six separate expiration dates. Certain events suspend the running of that period.

A CSED cannot be determined reliably from a balance-due notice. It requires reading the account transcript for each period, identifying the assessment date, and tracing every suspension event. See the chapters on account transcripts and the collection statute.

Statutes of Limitation at a Glance

The IRS Notice Sequence

IRS enforcement follows a defined escalation. Knowing where a notice sits in the sequence tells a taxpayer how much time remains and which rights are still available.