The Formula: Reasonable Collection Potential (RCP)
Everything turns on one number the IRS calculates: your Reasonable Collection Potential, or RCP. That's the amount they think they can squeeze out of you before your collection window closes.
RCP has two parts. First, the net realizable equity in your assets. That's what your house, vehicles, bank accounts, retirement, and business could produce if liquidated, minus what you owe on them and minus certain allowances. Second, your future income capacity. The IRS takes your monthly income, subtracts allowable living expenses, and multiplies the leftover over a set number of months.
That multiplier depends on how you pay. A lump sum cash offer generally uses a 12-month multiplier; a periodic payment offer uses 24 months. Add the two pieces together and you have your RCP. Your offer has to at least match it. This is why two people who both owe $80,000 can get wildly different answers. One has equity and income, the other doesn't.
The Three Legal Bases for an Offer
The IRS accepts offers on three grounds. The most common by far is doubt as to collectibility. That's the classic case: you genuinely can't pay the full balance before the debt expires, and your RCP proves it.
The second is doubt as to liability. Here you're arguing the tax itself is wrong. You don't actually owe what the IRS says you owe. This uses a different form, Form 656-L, and no application fee or deposit is required.
The third is effective tax administration. You agree you owe it and technically could pay, but collecting the full amount would create an economic hardship or be unfair given your circumstances. It's the narrowest path and the hardest to win.
The Paperwork, Fees, and Payments
A collectibility offer runs on two documents: Form 656, the offer itself, and Form 433-A (OIC) for individuals (or 433-B (OIC) for businesses), the financial statement that documents every asset, debt, and dollar of income. That financial statement is where the case is won or lost, so accuracy matters.
There's a $205 application fee and an initial payment. If you propose a lump sum, you send 20% of your total offer up front. If you propose periodic payments, you send the first installment and keep paying while the IRS reviews it. Both the fee and the initial payment are generally non-refundable, even if the offer is rejected.
If you meet the IRS low-income guidelines based on your household size and income, you can request a waiver. Qualify, and you skip both the application fee and the initial payment. The Form 656 booklet has the income chart you check against.
Compliance Before, During, and For Years After
You cannot buy your way out of noncompliance. Before the IRS will even consider your offer, you must be filing-compliant: all required returns filed, and current on this year's estimated payments or withholding. Miss that and your offer gets returned before anyone looks at the numbers.
The commitment doesn't end when the offer is accepted. You must stay fully compliant, filing and paying on time, for five years after acceptance. Slip up during that window and the IRS can default the agreement, reinstate the full original balance, and keep everything you already paid.
That's why an OIC is a beginning, not just an ending. It only sticks if you keep your side of the deal.
Setting Honest Expectations
The process takes months. It's normal for a well-prepared offer to sit in review for six months to a year, and a rejection can be appealed. This is not a quick fix.
And it is not for everyone. The mills that advertise guaranteed settlements take fees from people who never had a prayer of qualifying, because their RCP was higher than their debt. If you have significant equity or strong income, an installment agreement or another route may fit better than an OIC.
This article is general information, not legal advice, and every case is different. The only way to know your real number is to run your actual finances through the formula.