An offer in compromise lets you settle a federal tax debt for less than the full amount, but it isn’t a discount you simply ask for. The IRS runs your finances through a specific formula, and unless the math supports it, the offer gets rejected no matter how sympathetic your situation is. Understanding that formula is the difference between a real shot at this and wasted time.

The three kinds of offers, and the one that matters most:

The IRS recognizes three types of offers. A doubt as to liability offer applies when you have new information showing you don’t actually owe what the IRS says you do; it functions more like an audit reconsideration than a settlement. An effective tax administration offer applies when you could technically pay in full, but doing so would create a genuine hardship. These are reviewed by IRS Chief Counsel and granted rarely. The type almost everyone means when they say “offer in compromise” is a doubt as to collectibility offer: you’re telling the IRS you cannot pay the full balance, and here’s what you can pay instead. Everything below applies to that third type, since it covers the overwhelming majority of offers submitted.

The formula: reasonable collection potential

The IRS calls this number your reasonable collection potential, or RCP, and it has two parts.The first is your assets. The IRS takes the fair market value of what you own, multiplies it by 80% (called quick sale value, since you’re assumed to need to liquidate fast rather than wait for a good offer), and subtracts any loan balance ahead of the IRS’s claim. Whatever equity is left counts toward your offer. A home worth $450,000 with a $350,000 mortgage, for example, nets out to roughly $10,000 in countable equity once the 80% reduction and the loan are factored in. Retirement accounts, vehicles, bank balances, and business equipment all get run through similar math, though the specific rules vary by asset type.

The second part is future income: your household’s gross income, minus IRS-allowed expenses for housing, food, clothing, out-of-pocket healthcare, current taxes, and similar categories. These allowable expense amounts come from national and local standards the IRS publishes and updates periodically. They aren’t based on what you actually spend, but on what the IRS considers reasonable for a household your size in your area. What’s left over after those standards is your monthly disposable income, and that number gets multiplied by the number of months remaining on the IRS’s ten-year collection window for that debt, the collection statute expiration date. Add that to your countable asset equity, and that total is roughly what the IRS expects you to offer.

If the math shows you could pay the full balance over time, the offer gets rejected. The IRS isn’t in the business of accepting less than it can collect.

Lump sum versus periodic payment offers:

Once you know your target offer amount, you choose how to pay it. A lump sum offer requires 20% of the offer amount up front with the application, with the remaining balance paid in five or fewer payments once the IRS accepts. A periodic payment offer spreads the full amount over up to 24 months, with payments starting while the offer is still under review, and if you stop paying during that review period, the IRS treats the offer as withdrawn. The multiplier used in the future-income calculation differs between the two: a lump sum offer multiplies disposable income by 12 months, while a periodic payment offer multiplies it by 24, which is why lump sum offers are usually the smaller of the two if you can raise the up-front cash.

There’s also an application fee, currently $205, and the same up-front payment requirement for either option, both of which can be waived if you qualify under the IRS’s low-income certification guidelines, based on household size and income relative to federal poverty guidelines.

What happens after an offer is accepted?

Accepting an offer comes with a five-year condition attached. You’re required to stay in full compliance for five years afterward: every return filed on time, every current tax paid on time, no new balances. Fall out of compliance during that window, and the IRS can reinstate the original debt in full, minus whatever you already paid toward the offer. This trips people up more than the offer calculation itself, including retirees who assume they no longer need to file once they have no filing requirement. If you completed an offer in compromise, keep filing anyway. A gap in filed returns can look like a compliance failure even when there’s no tax due, and unwinding that mistake is harder than avoiding it in the first place.

What if the offer gets rejected?

A rejected offer can still be appealed. You have the right to appeal within 30 days, using Form 13711, and an IRS Office of Appeals reviewer who wasn’t involved in the original decision will take a fresh look at the RCP calculation. Appeals sometimes catch errors in how an asset was valued or an expense was disallowed the first time through. If the appeal doesn’t succeed, or the numbers genuinely don’t support an offer, other options remain: an installment agreement, currently-not-collectible status, or penalty relief can still bring the balance down to something manageable, just through a different mechanism than a settlement.

The paperwork that trips people up:

An offer application is built around two forms: Form 433-A (OIC) for individuals, which documents every asset, debt, and income source, and Form 656, the actual offer. The IRS cross-checks the numbers on those forms against

your bank statements, pay stubs, and account transcripts. A mismatch, such as an account you forgot to list or an asset valued differently than a recent appraisal, is one of the most common reasons an otherwise reasonable offer gets kicked back for more information or rejected outright. Missing signatures, an outdated version of the form, or an incomplete listing of prior-year returns cause the same kind of delay. None of this is complicated in isolation. It’s just a lot of detail to get right in one submission, and the offer unit isn’t inclined to fill in gaps on your behalf.

What about state tax debt at the same time?

An IRS offer in compromise only resolves federal tax debt. If you owe your state as well, that’s a separate negotiation with a separate agency, usually under different rules and a different formula entirely. Some states have their own version of an offer in compromise, and some don’t offer anything comparable, only installment plans. Address both debts as part of the same overall plan rather than assuming a federal settlement automatically carries over, because it doesn’t.

How long the process actually takes:

Plan for months, not weeks. The IRS’s own published guidance points to roughly six to eight months for a typical offer review, and cases with more complex financial pictures (multiple businesses, real estate holdings, income that fluctuates significantly year to year) can run longer. During that time, the offer unit may come back with follow-up questions or ask for updated financial documents if the review drags on long enough that your original paperwork is no longer current. Most active collection action pauses while an offer is pending, though the IRS can still file a federal tax lien, and interest continues to accrue on the underlying balance in case the offer isn’t accepted.

Can the terms of a periodic payment offer be adjusted later?

Once an offer is accepted, the payment terms are generally fixed, unlike a standard installment agreement, which allows more routine adjustment. If your financial situation changes dramatically for the worse during the payment period, the realistic options are usually limited to a short-term hardship pause worked out with the IRS or, in extreme cases, a request to restructure the agreement, and neither is guaranteed. That’s part of why getting the RCP calculation right before submission matters more here than it would for an installment agreement.

Why this is worth having someone calculate before you file:

The RCP formula rewards precision. Overvalue an asset or miss an allowable expense, and you’ll offer more than you need to. Undervalue your future income or skip a required compliance step, and the IRS will reject the offer outright, sometimes without a second look. Getting this right means pulling your account transcripts, confirming exactly where each tax year stands on the collection statute, and running the RCP calculation the same way the IRS’s offer unit will, before you commit to a number or pay a non-refundable application fee on an offer that was never going to be accepted.

Call PFGTAX at 888.572.2179 to have us run the numbers with you. We’ll tell you honestly whether an offer in compromise is likely to work for your situation, or whether a different resolution (a payment plan, penalty relief, or currently-not-collectible status) fits your numbers better.

This article is for general information only. It isn’t legal, accounting, or tax advice, and reading it doesn’t create a client relationship with PFGTAX. Every tax situation is different. Talk with a licensed tax professional about your specific circumstances before acting on anything here.