Cost of IRS tax debt: Interest, penalties, and waiting

Jennifer sat at her kitchen table on a Sunday with three numbers written on an index card.

The first was $19,000, what she owed. The second was $357, roughly what a six-year payment plan would cost her a month, which she had worked out from the IRS payment calculator. The third was $0, which was what she had been paying for two years.

She was trying to decide whether $357 a month was something she could do. What she had not worked out, and what this chapter works out, is what the $0 had been costing her, and what it would cost her to keep choosing it.

This is a chapter about the price of time. Some of the price is interest, which you can compute. Some of it is not, and the parts you cannot compute are the ones that do the most damage.

Three versions of Jennifer

Let me run her forward three years on three different paths. Her balance is $19,000, of which about $14,000 is tax and the rest is two years of penalties and interest already accrued. I will assume an IRS interest rate of seven and a half percent throughout, which is roughly where it has sat for the last few years, and I will round.

Path one: she does nothing for three more years. CP504 is not a promise that another warning will arrive. A state refund can be levied after the required notice; prior CDP notices and statutory exceptions matter for other levies. Charges can continue. The failure-to-pay rate generally rises to one percent for months or parts of months beginning more than ten days after a notice of intent to levy, subject to the applicable rules and penalty cap. Interest rates can change and interest compounds daily. Refunds applied to the debt, other payments and collection actions also change the balance. Use the calculator as an illustration—not a prediction that a particular wage levy will occur or that the balance will reach a fixed amount.

Path two: she sets up the six-year plan today. Because she filed on time and is in an approved installment agreement, the late-payment penalty drops to one quarter of one percent a month. Interest continues at the same rate. The combined cost of carrying the debt is roughly ten and a half percent a year, which is why $19,000 over 72 months comes out to about $357 a month and about $25,700 in total. After three years she has paid about $12,900 and owes about $10,500. No levy. No surprise. Her refunds are still taken, but they shorten the plan rather than disappearing into a growing hole.

Path three: she borrows against something and pays it off. If she has a home equity line at six percent, or a family member who will lend at nothing, the math says do it, with a caution I will come to. If the only credit she has is a card at 24 percent, the math says absolutely not. The IRS, for all its power, is one of the cheaper lenders in most people's lives. Replacing a ten-percent government debt with a twenty-four-percent private one is a mistake people make out of fear of the government, and it is a mistake.

The difference between path one and path two at the three-year mark is about $8,000 of balance that path one has and path two does not, in exchange for $12,900 of payments. Put differently, roughly $8,000 of Jennifer's $12,900 in payments is going to reduce the debt and the other $4,900 is the cost of having waited two years before she started. The $0 on her index card was never free. It was the most expensive number on the card.

The penalty rate is a switch, and you control it

I said this in Chapter 3 and I am saying it again because it is the most concrete financial argument there is for engaging with the IRS rather than drifting.

The late-payment penalty has three rates. Half a percent a month is the default. A quarter of a percent applies while you are in an approved installment agreement, provided you filed on time. One percent applies after the IRS has issued a notice of intent to levy and you have not paid within ten days.

That is a four-fold spread between the cheapest and most expensive states, and the state you are in is almost entirely determined by whether you have engaged. Linda's eighteen months of unofficial $200 payments ran at the half-percent rate, because she had no agreement, and would have moved to the one-percent rate had a final notice gone out. A formal agreement for the same $200 would have cut the penalty rate in half the day it was approved. Same money. Different rate. The difference was a phone call.

How the IRS applies what you send

People sometimes send a payment and discover it did not go where they expected. This is not malice. It is a rule, and once you know the rule you can work with it.

When you make a payment and do not say which year or which part of the balance it is for, the IRS applies it in the order that is best for the IRS. That means the oldest tax period first. Within a period, it goes to tax first, then penalty, then interest. The practical effect is that undesignated payments knock down the oldest tax, which stops the oldest interest from compounding, which is also usually good for you. But not always.

You have the right to designate a voluntary payment. Write the tax year and the type of tax on the memo line of a check, or include a letter, or select the period when paying online. The IRS must honor a designation on a voluntary payment. It will not honor one on an involuntary payment, meaning money taken by levy or applied from a refund; those go where the IRS chooses.

Why would you ever designate? Two reasons matter for ordinary taxpayers. First, if one year is about to expire under the ten-year rule and another has years left, you do not want your payment going to the one that is about to vanish on its own. Second, and much more important, if you have a business with unpaid payroll taxes, designating payments to the trust fund portion of the liability can reduce your personal exposure, because the personal penalty attaches only to that portion. David's chapter covers this. If it applies to you, do not send another undesignated dollar until you have read it.

Interest almost never comes off

Interest deserves plain treatment, because tax-relief marketing never gives it one.

The Code allows the IRS to abate interest in a narrow set of situations, mainly where the interest accrued because of an unreasonable error or delay by an IRS employee in performing a ministerial or managerial act. A file that sat on a desk for eleven months with no action while you waited for a decision. A payment the IRS received and did not post for a year. The request is made on Form 843, and you have to show the delay was the IRS's and that it was not caused by anything you did or failed to do. Interest that accrued because you did not pay, because you did not file, or because you did not respond is not abatable, no matter how sympathetic the circumstances.

There is one indirect route. Interest charged on a penalty disappears when the penalty is removed. If the IRS abates a $5,000 failure-to-pay penalty, the interest that accrued on that $5,000 is removed with it. That is often a meaningful amount on an older debt, and it is one of the reasons to pursue penalty relief early. The penalty is the lever. The interest follows.

Otherwise, assume the interest is permanent and plan around it.

The costs that do not show on the transcript

The interest and penalty math above is the part you can compute. The part you cannot compute is where the real price of waiting lives.

Your refunds are gone until the debt is. Every year you have a balance, any federal refund is taken and applied. People plan around refunds. They use them for a car repair, a property tax bill, a child's braces. If you owe, that money is not coming, and you should stop counting on it. Fixing your withholding so you do not generate a refund is often smarter than letting the IRS hold your money interest-free and then take it.

Your passport can be frozen. Above the indexed threshold, with a debt in active collection and no agreement, hearing, or hardship status in place, the IRS can certify you to the State Department. If you travel for work, or have family abroad, this can arrive at exactly the wrong moment, and the decertification process after you resolve things takes weeks.

A lien becomes a public fact. Since 2018 the major credit bureaus have not included tax liens in credit reports, which people take to mean liens are invisible. They are not. A Notice of Federal Tax Lien is a public record in your county, searchable by anyone, and mortgage lenders, landlords, and commercial lenders search. A lien filed while you wait will complicate a refinance, a home sale, and a business loan for years, and getting it withdrawn afterward is a separate process with its own rules.

Waiting can complicate the response. You can discuss payment or hardship options at different collection stages, but an active levy, a recorded lien or an imminent hearing deadline creates additional work. An installment agreement does not automatically prevent or remove every lien. A filed lien may require release, withdrawal, discharge or subordination depending on the circumstances. Act on the actual notice history rather than assuming each reminder removes exactly one choice or guarantees another period of safety.

The debt is sitting in your head. I will not belabor this, but every person I have described in this book spent months or years carrying this problem around as a low constant hum. It affects sleep, marriages, work, and the ability to make other financial decisions with a clear mind. That has a price. It does not appear on any form the IRS will ever send you, and it is paid every single day the problem goes unaddressed.

When waiting is the right move

Having said all that, there are situations where not paying, or not paying yet, is correct. They are worth naming so that you can tell the difference between strategic patience and the drawer.

When the number is wrong. If you are disputing the liability, as Anthony was, paying the disputed amount while you dispute it is often a mistake, because getting money back from the IRS is slower than not sending it. Pay the part you agree you owe. Dispute the rest. Chapter 5.

When the clock is close. If a year is within reach of its collection expiration date, the right strategy may be to protect yourself from levy through hardship status or a hearing and let the clock run. This is legal. The IRS knows it happens. It is the subject of Chapter 7, and it has limits.

When any payment causes hardship. If paying the IRS means not paying rent, the IRS's own rules say you should not be paying the IRS, and Currently Not Collectible status exists for exactly that. Interest still runs. You are not avoiding the cost. You are deferring it because the alternative is worse. Chapter 11.

While an offer is pending. Once the IRS accepts an Offer in Compromise for processing, collection is generally suspended until it decides. You should keep making the payments the offer requires, but you are not expected to keep paying down the underlying balance. Chapter 10.

In each of these, notice what is happening. The taxpayer has engaged, has made a decision, has a reason, and is using a defined status or procedure. That is the opposite of the drawer. The drawer has no status, no procedure, and no end.

A word about borrowing to pay

Path three above deserves a caution that the math alone does not capture.

Federal tax debt is unsecured. The IRS has a lien against your property by operation of law, but as we saw in Chapter 2, actually taking your home requires a federal judge and almost never happens. A home equity loan is secured by your house in a way that a bank will enforce without a judge's permission and without much hesitation. When you refinance a tax debt into your mortgage, you convert a debt that is uncomfortable but rarely fatal into one that can cost you your home if your income drops.

For some people that is still the right choice. A stable income, a manageable loan, a rate well below the IRS's, and a strong desire to be done with the government can make it the right choice. But do the comparison with your eyes open. Interest rate is one dimension. Risk is another. Flexibility is a third: the IRS will modify a payment plan if your circumstances change, and will suspend collection entirely if they get bad enough. Your mortgage lender will not.

If you are deciding this today, do it conditionally. If your job is secure and the rate difference is large, borrowing can make sense. If your income is irregular or the house is the only thing you own outright, the IRS plan is probably the safer debt to carry, even at a higher rate.

What Jennifer did

She set up the plan. It was not dramatic. She went into her online account, selected a long-term payment agreement, chose direct debit, picked the 15th of the month, and agreed to $360, slightly more than the minimum so it would finish faster. The system approved it while she watched. The late-payment penalty rate on her account dropped by half that day. She also changed her W-4 so she would stop generating refunds the IRS would take, and redirected the difference into the plan.

Two years of waiting had cost her roughly $5,000 in penalties and interest and two refunds. Forty minutes on a Sunday stopped the bleeding. Hold on to that ratio.

But I have been assuming something about Jennifer's debt that I should not assume about yours: that it is young. Her year was two years old. The IRS had eight more to collect it. For Robert, whose oldest years were assessed almost nine years ago, the question of time has an entirely different shape, and it is the subject of the next chapter.

Official notice sources

IRS CP504 instructions and Publication 1660: collection appeal rights and levy exceptions. Follow current instructions and the deadline on your actual notice.