How to Defer Income to Next Year: Rules, Strategies, and Pitfalls

To defer income to next year, you shift the moment you have the legal right to receive money from December into January or later, using arrangements that genuinely restrict your access to the funds: retirement plan contributions, delayed billing on work not yet completed, installment sale contracts, or formal deferred compensation elections. Done correctly, this pushes the tax bill on that income to the following April 15, roughly a 15-month interest-free delay.¹ Done informally, it doesn’t work at all. The strategies below differ by how you earn your money, but every one of them has to survive the same rule.

The Rule That Governs Everything Else

Under Treasury Regulation 1.451-2, income is “received” for tax purposes the moment it is credited to your account or otherwise made available to you, whether or not you actually take it.² This is called constructive receipt, and it is the reason casual deferral fails.

An employer cuts your bonus check on December 30. You leave it in your desk until January 3. The bonus is taxable in December because nothing stopped you from cashing it. Same result if you call a client and ask them to hold your invoice payment until January after the work is already done and billed. The IRS treats income as received the instant you have the right to it.

Every legitimate deferral method works around this rule by imposing a real restriction on access before the income is earned. Qualified retirement plans, installment sale contracts, and Section 409A deferred compensation agreements all share that structure. If there’s no genuine limit on when you can get the money, there’s no deferral.

If You Earn a W-2 Salary

Salaried employees have the least direct control over paycheck timing, so deferral usually runs through tax-advantaged accounts rather than payroll manipulation.

401(k) and 403(b) Contributions

Elective contributions to a traditional 401(k) or 403(b) come out of your gross wages, reducing federal taxable income (and usually state taxable income) in the year contributed. For 2026, the base employee deferral limit is $24,500, with a $8,000 catch-up for those 50 to 59 or 64 and older.³ SECURE 2.0 created a higher catch-up of $11,250 for participants who are 60 through 63 during the year, which brings the maximum employee deferral for that narrow age band to $35,750 for 2026.⁴ Not every employer plan has adopted the higher catch-up, so confirm with HR before counting on it.

The practical constraint: salary deferrals have to be made through payroll, and the last payroll of the calendar year is your final chance. This is a strategy for people who look at their income in October or November, not December 30.

Traditional IRAs

A traditional IRA is the rare deferral tool you can use after the year ends. The 2026 contribution limit is $7,500, with a $1,100 catch-up at age 50 or older, and you have until April 15 of the following year to contribute and apply the deduction to the prior tax year.⁴ That gives you time to see your final numbers before deciding.

The deduction phases out if you or your spouse are covered by a workplace retirement plan and your modified AGI is high enough. For 2026, a covered single filer starts losing the deduction at $81,000 of modified AGI and loses it entirely at $91,000. For married filing jointly, when the contributing spouse is covered, the phase-out runs from $129,000 to $149,000.⁴ Above those thresholds, the contribution is still allowed but produces no current deferral.

Health Savings Accounts

If you’re enrolled in a qualifying High Deductible Health Plan, an HSA gives you a deduction on the way in, tax-free growth, and tax-free withdrawals for medical expenses. For 2026, an HDHP must carry a minimum annual deductible of $1,700 for self-only coverage or $3,400 for family coverage.⁵ Contribution limits for 2026 are $4,400 for self-only and $8,750 for family coverage, with an extra $1,000 available at age 55 or older.⁶ Like the IRA, you can contribute up to April 15 and apply it to the prior year. The deduction is above-the-line, so it reduces AGI whether you itemize or not.

If You Own a Business

Cash-method sole proprietors, partnerships, and S-corporations recognize income when payment arrives, not when the invoice goes out. That timing gap is the deferral tool.

The cleanest move is to hold off on invoicing late-year work so payment can’t reach you before January. This has to be real. If a client has already paid, or the funds are sitting in an account under your control, the IRS treats the income as received in December no matter what your invoice says. The delayed billing has to reflect an actual business rhythm, not a phone call in late December asking to hold a check you were already owed.

On the other side of the ledger, accelerating deductible expenses into the current year lowers net profit. Prepaying insurance premiums, buying supplies, or scheduling maintenance before December 31 all reduce what flows through to your Schedule C or K-1.

SEP IRAs and Solo 401(k)s

Self-employed retirement plans allow far larger contributions than employee-only accounts, and they double as deferral tools.

A SEP IRA accepts contributions of up to 25% of net self-employment income, capped at $72,000 for 2026, and you can establish and fund it as late as your filing deadline including extensions.⁴ A sole proprietor on extension could open a SEP in October of the following year and still claim the prior-year deduction.

A Solo 401(k) lets you contribute as both employee and employer: the employee side follows the $24,500 base limit (plus catch-up amounts), and the employer side adds up to 25% of compensation, with a combined ceiling of $72,000 before catch-ups. The plan itself must be established by December 31 of the tax year you want to claim, though contributions can follow up to the filing deadline. The SEP is easier if you don’t know your profit until after year-end; the Solo 401(k) requires earlier setup but is more forgiving when net income is modest, because the employee deferral doesn’t depend on a percentage of profit.

The QBI Threshold

Pass-through business owners should watch how deferral interacts with the Section 199A qualified business income deduction, which allows up to 20% off qualifying business income.⁷ The deduction was originally set to expire after 2025. If it has been extended, keeping taxable income below the threshold where limits begin (projected around $201,750 single, $403,500 joint for 2026) increases the value of any deferral that gets you under the line. Confirm the current status before relying on it.

If Your Income Comes From Investments

Investment gains aren’t taxed until you sell, so the timing of a sale is itself a deferral decision.

Harvesting Losses to Offset Gains

Selling a position at a loss produces a realized capital loss that offsets realized gains dollar for dollar. If losses exceed gains, up to $3,000 of net loss can offset ordinary income ($1,500 if married filing separately), with the rest carrying forward indefinitely.⁸

The wash sale rule blocks the loss if you buy the same or a substantially identical security within 30 days before or after the sale.⁹ The disallowed loss isn’t gone forever; it adds to the basis of the replacement shares. But it can’t offset gains in the current year. To stay invested in the same sector without triggering the rule, buy a different fund tracking the same market segment.

Waiting to Sell

Holding a winning position past December 31 shifts the entire gain into the next tax year. Long-term capital gains (assets held longer than one year) run through brackets that top out at 20% for 2026, and delaying a sale can also keep modified AGI below the $200,000 single or $250,000 joint threshold where the 3.8% Net Investment Income Tax attaches.¹⁰¹¹ The bigger the gain, the more the timing matters.

Installment Sales

For real estate, a private business, or other large non-publicly-traded assets, IRC Section 453 lets you spread the gain over multiple years by taking payments over time. You recognize gain in proportion to each payment received, provided at least one payment lands after the year of sale.¹² A $200,000 gain on a rental property paid out over five years produces roughly $40,000 of recognized gain a year rather than a single $200,000 spike.

The installment method is not available for publicly traded securities, dealer property (inventory), or sales of depreciable property to related parties, and depreciation recapture must be recognized in the year of sale regardless of the payment schedule.¹² Within those limits it’s one of the few ways to avoid a single-year income spike from a major disposition.

If You’re an Executive With Access to Deferred Compensation

Nonqualified deferred compensation plans let highly paid employees defer salary, bonus, or equity awards beyond retirement plan limits. The trade-off is IRC Section 409A, which is unforgiving on timing.

The deferral election generally must be made before the tax year in which the compensation will be earned. For performance-based bonuses covering a service period of at least 12 months, the election deadline is six months before the end of that period. Miss it and the income can’t be retroactively deferred.¹³

Distributions can only occur on defined triggers: separation from service, disability, death, a fixed date set in advance, a change in corporate control, or an unforeseeable emergency.¹³ You cannot pull the money at will. That restriction is what defeats constructive receipt. The other side is credit risk: nonqualified deferred comp is generally an unsecured promise from your employer, so if the company fails, you’re a general creditor.

Where Deferral Goes Wrong

The penalties for getting deferral wrong can exceed the tax you were trying to postpone.

Contributing over the annual limit to an IRA or HSA triggers a 6% excise tax on the excess every year it sits in the account, reported on Form 5329.¹⁴ Withdraw the excess and any attributable earnings before your filing deadline and there’s no lasting damage; leave it and the 6% compounds.

A Section 409A failure is worse. The deferred amount snaps into current income, and there’s an additional 20% tax on top of regular income tax, plus an interest charge at the underpayment rate plus one percentage point.¹³ Late elections, unauthorized distribution accelerations, and undocumented plans are the common causes.

And then there’s the underlying rule. If the IRS finds you had access to income you tried to defer, it goes back into the year it was available, with interest and possible accuracy-related penalties. Informal payment-hold requests with clients are the most frequent target.

Does the Deferral Actually Save Money?

Everything you defer into a traditional retirement account eventually gets taxed. Starting at age 73, required minimum distributions kick in from traditional IRAs, 401(k)s, SEP IRAs, and similar accounts, with the first RMD due by April 1 of the year after you turn 73 and every subsequent RMD due by December 31.¹⁵ Missing one costs a 25% excise tax on the amount you should have taken, dropping to 10% if you correct it within two years.¹⁶

If you expect a lower tax bracket in retirement, deferring now to pay later is a real arithmetic win. If you expect the same or a higher bracket, the current deduction just buys you a delay, not a savings, and Roth contributions (which have no RMD during the owner’s lifetime and pay no tax on qualified withdrawals) may work better. The deferral decision worth making is the one that accounts for the tax bill on both ends.

1
Internal Revenue Service. When to File
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eCFR. 26 CFR 1.451-2 – Constructive Receipt of Income
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Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits
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Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
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Internal Revenue Service. Rev. Proc. 2025-19
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Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans
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Internal Revenue Service. Qualified Business Income Deduction
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Internal Revenue Service. Topic No. 409, Capital Gains and Losses
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Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities
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Internal Revenue Service. Topic No. 559, Net Investment Income Tax
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Internal Revenue Service. Questions and Answers on the Net Investment Income Tax
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Office of the Law Revision Counsel. 26 USC 453 – Installment Method
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Office of the Law Revision Counsel. 26 USC 409A – Inclusion in Gross Income of Deferred Compensation Under Nonqualified Deferred Compensation Plans
14
Internal Revenue Service. Form 5329 – Additional Taxes on Qualified Plans (Including IRAs) and Other Tax-Favored Accounts
15
Internal Revenue Service. Retirement Topics – Required Minimum Distributions (RMDs)
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Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs