When you sell a customer list, the proceeds are rarely all capital gain or all ordinary income. The sale of a customer list typically produces both: any portion of the gain that matches amortization you previously deducted is recaptured as ordinary income, and anything above that generally qualifies as long-term capital gain under Section 1231 if you held the list more than a year and used it in your trade or business. The split depends on whether you built the list or bought it, how much you’ve already written off, and whether the sale is wrapped into a larger business deal.
Your Basis Decides How Much Gain Exists
Gain is the sale price minus your adjusted basis. Everything about character and rate flows from that number, so start there.
A List You Built Yourself
If you grew the list through your own marketing, sales work, and relationship management, your adjusted basis is almost always zero. Those costs were deducted as ordinary business expenses in the years you paid them.1Office of the Law Revision Counsel. 26 U.S.C. 162 – Trade or Business Expenses Nothing is left to offset the sale price, so every dollar you receive is gain.
A self-created list also sits outside the definition of an amortizable Section 197 intangible for the person who created it. The code excludes self-created intangibles like customer lists from Section 197 unless they were created in connection with a business acquisition.2eCFR. 26 CFR 1.197-2 – Amortization of Goodwill and Certain Other Intangibles That matters for the recapture analysis in the next section: with no amortization to recapture, the whole gain can head toward capital gain treatment.
A List You Previously Purchased
If you acquired the list in an earlier transaction, your starting basis is what you paid, or the amount specifically allocated to the list if it came as part of a larger deal. A customer list acquired with a business is a Section 197 intangible, and the code defines that category broadly enough to include “lists or other information with respect to current or prospective customers.”3Office of the Law Revision Counsel. 26 U.S.C. 197 – Amortization of Goodwill and Certain Other Intangibles You’ve been amortizing it over a mandatory 15-year period, so your adjusted basis is the original cost minus every dollar of amortization taken to date. That amortization is exactly what triggers ordinary-income recapture on sale.
Capital Gain, Ordinary Income, or Both
Two code sections do most of the work here. Section 1231 opens the door to capital gain treatment. Section 1245 pulls part of that gain back into ordinary income.
Section 1231 Gives the Capital Gain Treatment
A customer list held more than a year and used in your trade or business is Section 1231 property. If your net Section 1231 gains for the year exceed your Section 1231 losses, the net is taxed at long-term capital gains rates.4Office of the Law Revision Counsel. 26 U.S.C. 1231 – Property Used in the Trade or Business If losses exceed gains, the net is ordinary loss, deductible against ordinary income without the usual capital loss caps.
One lookback rule can take that capital treatment away. If you claimed net Section 1231 losses in any of the prior five tax years, your current-year Section 1231 gain is recharacterized as ordinary income up to the amount of those unrecaptured losses. Check your prior returns before you count on capital rates.
Section 1245 Recapture Pulls Part Back Into Ordinary Income
This is the surprise for many sellers. If you purchased the list and claimed amortization, the gain tied to those deductions is recaptured as ordinary income. Section 1245 says that when you sell amortizable property at a gain, the portion of that gain up to the total amortization previously deducted is taxed at ordinary rates.5Office of the Law Revision Counsel. 26 U.S.C. 1245 – Gain From Dispositions of Certain Depreciable Property Only the gain above that recapture amount feeds into the Section 1231 netting and the possibility of capital gain treatment.
A worked example makes it concrete. You bought a list for $300,000 as part of a business acquisition and have claimed $100,000 of amortization. Your adjusted basis is $200,000. You sell for $350,000, producing a $150,000 gain. The first $100,000, matching your prior amortization, is ordinary income under Section 1245. The remaining $50,000 enters Section 1231 and, assuming no offsetting losses or lookback issues, is taxed as long-term capital gain.
For a self-created list with zero basis and no amortization history, there is nothing to recapture. The full gain goes through Section 1231.
Aggregation When Other Intangibles Are in the Deal
If the customer list is sold alongside other Section 197 intangibles in a single transaction, those intangibles are grouped together for recapture purposes.6Office of the Law Revision Counsel. 26 U.S.C. 1245 – Gain From Dispositions of Certain Depreciable Property – Section (b)(8) A loss on one intangible offsets a gain on another before recapture is computed. Intangibles whose adjusted basis exceeds fair market value are excluded from the pool, so those losses are preserved for separate treatment.
The Rates That Actually Apply
The ordinary-income portion — Section 1245 recapture or any amount recharacterized by the five-year lookback — is taxed at your marginal rate, which can reach 37% for 2026. The capital gain portion runs at the long-term rates: 0% on taxable income up to roughly $49,450 for single filers ($98,900 for joint filers), 15% above that, and 20% once single filers pass about $545,500 ($613,700 joint).
The 3.8% Net Investment Income Tax
A 3.8% surtax on net investment income applies to individuals with modified adjusted gross income over $200,000 ($250,000 for married couples filing jointly).7Office of the Law Revision Counsel. 26 U.S.C. 1411 – Imposition of Tax Those thresholds haven’t changed since 2013. Whether this surtax hits your customer-list gain depends on your involvement. Gain from property held in a non-passive trade or business is excluded from net investment income, so if you materially participated in the business, the surtax generally doesn’t apply. If the business was passive to you, expect the extra 3.8%.
State Tax
Most states tax capital gains as ordinary income, with rates from zero to over 13%. Nine states impose no tax on most capital gains. The combined federal and state figure can meaningfully change what you keep, so run both before you set a price.
Spreading the Gain Over Multiple Years
If the buyer pays you across more than one tax year, the installment method lets you recognize gain as payments come in rather than all at once.8Office of the Law Revision Counsel. 26 U.S.C. 453 – Installment Method You compute a gross profit ratio (total gain divided by total contract price) and apply it to each payment (after any interest component) to find the gain reportable that year.9Internal Revenue Service. Publication 537 (2025), Installment Sales Keeping gain out of a single year can hold you in lower brackets and defer the cash owed to the IRS.
Two limits matter for a customer-list sale. Any Section 1245 recapture must be recognized as ordinary income in the year of the sale no matter when payments arrive.10Office of the Law Revision Counsel. 26 U.S.C. 453 – Installment Method – Section (i) Only the gain above the recapture amount qualifies for installment treatment. And if your outstanding installment obligations from the year exceed $5,000,000 in face amount, an interest charge applies to the deferred tax on the portion above that threshold.11Office of the Law Revision Counsel. 26 U.S.C. 453A – Special Rules for Nondealers
When the List Is Sold With a Whole Business
If the customer list is one piece of a larger business sale, the total price has to be allocated among all the assets transferred. That allocation decides how much of your proceeds get customer-list treatment at all.
The Residual Method and Where Customer Lists Land
Section 1060 requires both buyer and seller to allocate the purchase price using the residual method, filling seven asset classes in sequence up to fair market value.12Office of the Law Revision Counsel. 26 U.S.C. 1060 – Special Allocation Rules for Certain Asset Acquisitions Customer lists sit in Class VI, covering Section 197 intangibles other than goodwill.9Internal Revenue Service. Publication 537 (2025), Installment Sales A written allocation agreement between the parties binds both sides unless the IRS determines it is not appropriate.
Both buyer and seller must file IRS Form 8594 with their returns for the year of the sale, reporting the agreed allocation.13Internal Revenue Service. About Form 8594, Asset Acquisition Statement Under Section 1060 The IRS compares the two filings. If an earnout, price dispute, or other adjustment later changes the numbers, you file an amended Form 8594.
Noncompete Dollars Are Always Ordinary
Business sales frequently include a covenant not to compete, and this is the one place where the capital-vs-ordinary question has only one answer. For the seller, every dollar allocated to a noncompete is ordinary income, because the payment is for a personal service commitment. The buyer treats the noncompete entered into in connection with the acquisition as a separate Section 197 intangible, amortized over 15 years just like the customer list.3Office of the Law Revision Counsel. 26 U.S.C. 197 – Amortization of Goodwill and Certain Other Intangibles
The buyer’s deduction timeline is the same whether a dollar is allocated to the list or to the noncompete, but the seller’s tax character is very different. That’s the tension in most allocation negotiations: the seller pushes dollars toward assets that produce capital gain and away from the noncompete, while the buyer is largely indifferent on timing but may have its own reasons to document a meaningful noncompete value. A noncompete also can’t be treated as disposed of or worthless until the entire business interest connected to it is sold, so there’s no accelerated loss escape hatch later.
Before signing, run the numbers both ways. The headline price matters less than how it splits between the list, goodwill, the noncompete, and any other intangibles, because that split is what determines whether your proceeds come out at capital rates, ordinary rates, or a blend of both.