Section 453A: Interest Charge and Pledge Rule on Large Notes
Section 453A adds two rules to large installment sales. First, if more than $5 million of installment notes from the year's sales are still outstanding at year end, you pay an annual interest charge on part of the tax you are deferring (§453A(a)(1), (c)). Second, for any sale over $150,000, if you borrow against the note, the loan proceeds are treated as a payment on the note and the gain is taxed right then (§453A(d)).
The interest charge is often misunderstood. It does not apply to the whole deferred tax, and it does not kill most large installment sales: it applies only to the share of your notes above $5 million, at the IRS underpayment rate. The pledge rule is the bigger practical trap, because it applies at a much lower threshold and it is the rule that sinks "borrow against the note" strategies.
Who it hits: sales over $150,000 and more than $5 million outstanding at year end
The statute has two thresholds, and they do different jobs.
| Threshold | What it triggers | Source |
|---|---|---|
| Sales price over $150,000 | The obligation is covered by §453A at all, including the pledge rule | §453A(b)(1) |
| Face amount of the year's covered obligations outstanding at year end over $5,000,000 | The interest charge on deferred tax | §453A(b)(2) |
Details that matter:
- The $5 million test is per year of sale. It looks at obligations that "arose during, and are outstanding as of the close of, such taxable year" (§453A(b)(2)(B)). Once a year's notes are subject to the charge, the charge continues in later years while those notes are outstanding (Pub. 537, "Interest on Deferred Tax").
- Related sales are combined for the $150,000 test. All sales that are part of the same transaction or a series of related transactions count as one (§453A(b)(5)).
- Exempt property. Farm property (used or produced in the trade or business of farming) and an individual's personal-use property are excluded from both rules (§453A(b)(3)). Timeshares and residential lots under the §453(l) election have their own interest rule (§453A(b)(4)).
- It applies to any installment obligation, however structured. A seller-financed note, a structured installment sale and a note to a family member are all "obligations" for this purpose.
How the interest charge is computed
The formula is in §453A(c):
Interest = deferred tax liability x applicable percentage x underpayment rate
- Deferred tax liability is the gain not yet recognized at year end times the maximum tax rate for the year: the top ordinary rate for ordinary gain, and the maximum §1(h) rate for gain that will be long-term capital gain (§453A(c)(3)). It uses the maximum rate, not your actual rate.
- Applicable percentage is the face amount of the year's covered notes above $5,000,000, divided by their total face amount, at the end of the year of sale (§453A(c)(4)). Pub. 537 states that it "is computed in the year of sale and is used for all subsequent years."
- Underpayment rate is the §6621(a)(2) rate for the month in which your tax year ends (§453A(c)(2)(B)). It was 7% for the third and fourth quarters of 2026.
Individuals report the result as an additional tax on Schedule 2 (Form 1040), and Pub. 537 states that for individuals "this interest isn't deductible." Corporations can deduct it.
Worked example: a $12 million land sale
Simple example. An individual sells investment land (not farm property) for $12,000,000 with a $2,000,000 basis. Gain: $10,000,000, all long-term capital gain. The buyer pays $1,200,000 down and signs a $10,800,000 note, paid $1,080,000 a year for ten years plus interest. The seller has no other installment sales that year. Maximum long-term capital gain rate: 20%. Underpayment rate held at 7%.
| Item | Amount |
|---|---|
| Gross profit percentage ($10M / $12M) | 83.33% |
| Face outstanding at end of year 1 | $10,800,000 |
| Applicable percentage (($10.8M - $5M) / $10.8M) | 53.70% |
| Unrecognized gain ($10.8M x 83.33%) | $9,000,000 |
| Deferred tax liability ($9M x 20%) | $1,800,000 |
| Year-1 interest charge ($1.8M x 53.70% x 7%) | $67,667 |
The charge shrinks as the note is paid down, because the unrecognized gain falls while the applicable percentage stays fixed:
| Year-end | Face outstanding | Unrecognized gain | Deferred tax liability | Interest at 7% |
|---|---|---|---|---|
| 1 | $10,800,000 | $9,000,000 | $1,800,000 | $67,667 |
| 2 | $9,720,000 | $8,100,000 | $1,620,000 | $60,900 |
| 3 | $8,640,000 | $7,200,000 | $1,440,000 | $54,133 |
| 4 | $7,560,000 | $6,300,000 | $1,260,000 | $47,367 |
| 5 | $6,480,000 | $5,400,000 | $1,080,000 | $40,600 |
Notice that the charge continues even after the balance drops below $5 million in a later year, because the test was applied to the obligations in the year they arose.
Two simplifications to flag: the example ignores selling costs, state tax and the 3.8% net investment income tax (which is imposed by §1411, not by the §1 rates the formula names), and the underpayment rate resets quarterly, so the real charge moves with it.
The pledge rule: borrowing against the note = payment
Section 453A(d)(1): if a loan "is secured by an installment obligation to which this section applies, the net proceeds of the secured indebtedness shall be treated as a payment received on such installment obligation." The payment is treated as received at the later of when the loan becomes secured or when you get the money.
The reach is broad. A loan counts as secured by the note "to the extent an arrangement allows the taxpayer to satisfy all or a portion of the indebtedness with the installment obligation" (§453A(d)(4)). You do not need a formal pledge; a right to hand over the note in repayment is enough.
Three points sellers miss:
- It applies from $150,000, not $5 million. A $600,000 seller note is covered by the pledge rule even though it will never see the interest charge.
- It is capped, and later payments are not taxed twice. The deemed payment cannot exceed the total contract price less payments already received (§453A(d)(2)). After a pledge, later payments on the note are not taxed again until they exceed the amount already treated as received (§453A(d)(3)).
- Farm and personal-use property are exempt (§453A(b)(3)), which is why a 2012 IRS field memo on a loan against farm-sale notes (FAA 20123401F) does not help non-farm sellers.
Simple example. You sell a rental for $1,000,000 with a 60% gross profit percentage and carry an $800,000 note. In year 2 you borrow $300,000 from a bank, secured by the note. The $300,000 (net of loan costs) is a payment: $180,000 of gain is taxed in year 2. Your next $300,000 of principal received from the buyer is not taxed again.
A seller who needs cash early can negotiate a larger down payment. Or, if the note is not needed for a plan like the one in The Waterfall Strategy, a CPA can weigh electing out of the installment method on a timely return (§453(d)). Selling the note outright is a disposition that accelerates the gain (§453B); see installment note default, repossession and payoff.
Why this matters for monetized installment sales
A monetized installment sale pairs an installment note with a loan to the seller for most of the price. The pledge rule is one of the three reasons the IRS gave in 2023 for disregarding it: in the proposed regulations' preamble, "the pledging rule of section 453A(d) deems the seller to receive full payment on the purported installment obligation in the year the seller receives the loan proceeds" (88 FR 51756, 51760 (Aug. 4, 2023), REG-109348-22). Those regulations would make monetized sales listed transactions; as of September 2026 they are still proposed, not final. Chief Counsel called the promoters' theory "flawed" in CCA 202118016. Our full write-up: monetized installment sale.
A structured installment sale is built the other way: the seller has no right to pledge, borrow against, sell or accelerate the payments, which is meant to keep the pledge rule and constructive receipt out of the picture. The trade-offs: the seller is an unsecured creditor of the assignment company, the schedule is locked, a commission is built into the pricing, and no statute, regulation or published IRS ruling specifically approves the structure. The §453A interest charge still applies to a structured sale with more than $5 million of obligations at year end. See the structured installment sale guide.
Seeing "Section 453A(c) interest" on a K-1
If a partnership you own sells property on the installment method, you may see box 20, code P, "Section 453A(c) information," on your Schedule K-1 (Form 1065). According to the IRS Partner's Instructions for Schedule K-1, the partnership reports the information you need to figure the interest "with respect to certain installment sales," from each Form 6252 where your share of the selling price, including mortgages and other debts, is greater than $150,000: a description of the property, dates acquired and sold, selling price, gross profit percentage, payments received, installment income, and whether the income is capital or ordinary.
What to do with it:
- The partnership does not compute your charge. You (or your preparer) combine your share of the partnership's obligations with any of your own for the $5 million test, then run the formula above.
- Report the charge as an additional tax. The K-1 instructions say it goes on the "Other taxes" line; Pub. 537 points individuals to Schedule 2 (Form 1040).
- It is not deductible for individuals (Pub. 537).
- If your combined share is under $5 million at year end, there is no interest charge, but keep the information: later years and other sales can change the answer.
Breakeven: when the charge wipes out the deferral
Deferral is worth having only if what the deferred tax earns in your hands beats what the interest charge costs. The breakeven yield on the deferred tax is simply:
Breakeven yield = underpayment rate x applicable percentage
In the $12 million example: 7% x 53.70% = 3.76%. If the dollars you did not pay in tax can earn more than about 3.76% a year (after your own tax on those earnings), the deferral still pays; below that, it costs more than it saves. With a $10 million note, the applicable percentage is 50%, so the breakeven is 3.5% at a 7% rate.
Three things move the answer:
- Size. The closer your year-end total is to $5 million, the smaller the applicable percentage. A $6 million note has an applicable percentage of about 16.7%.
- Rates. The underpayment rate resets quarterly; recheck each year.
- Other benefits of spreading. The charge ignores the bracket savings from spreading gain, and any stuck passive losses the gain can meet. For many sellers those benefits are larger than the charge. Model it in the installment sale calculator and the installment sale guide.
One more planning lever: the test counts obligations by the year they arise, so splitting unrelated sales across tax years can keep each year under $5 million. Sales that are part of the same transaction or a series of related transactions are combined (§453A(b)(5)).
Bottom line
Section 453A charges interest only on the share of a year's installment notes above $5 million, at the IRS underpayment rate, and it is not deductible for individuals. The pledge rule is broader: for any sale over $150,000, borrowing against the note, or any arrangement that lets you satisfy a loan with it, is treated as getting paid. Size the note with both rules in mind, and do not count on borrowing against it.
Questions to ask your CPA
- Will my installment obligations from this year's sales, including my share of any partnership sales, exceed $5 million at year end?
- What applicable percentage and deferred tax liability does that produce, and what is the breakeven yield?
- Is any part of the sale farm property or personal-use property that is exempt?
- Would splitting unrelated sales across tax years keep each year under the threshold?
- Does anything in my loan documents or note let a lender look to the installment obligation?
- How do I report the K-1 box 20 code P information, and is the charge reflected in my estimated tax payments?
Run your own numbers. Compare a cash sale, seller financing and a structured installment sale side by side, free.
Educational only, not tax, legal or investment advice. Examples are illustrative. Have your CPA or tax attorney review your facts before you act. Hans Goldstein is a licensed insurance agent (CA Insurance License #4273294) and is not a CPA or attorney. He is paid a commission only if a structured installment sale is funded; seller financing pays him nothing. Disclosures.