How to Reinvest Business Profits to Avoid Taxes

You can legally shrink a profitable year’s tax bill by putting the money back to work in ways the tax code rewards: buying equipment your business will actually use, funding retirement plans, prepaying operating costs, investing in research, and acquiring or improving real estate. That is the core of how to reinvest business profits to avoid taxes. Every dollar spent on a deductible investment reduces taxable income by the same dollar, and certain investments generate credits that cut the tax itself. The playbook below runs from the fastest levers to the more involved ones, with the compliance rule that governs all of them at the end.

Buy the Equipment You Need Before Year-End

Purchasing equipment, vehicles, software, or qualifying property improvements is the fastest way to convert a profitable year into a lower tax bill. Two provisions let you deduct the full cost immediately instead of spreading it across the asset’s useful life.

Section 179 Expensing

Section 179 lets you write off the entire purchase price of qualifying equipment, machinery, software, and certain property improvements in the year you place the asset in service. The base deduction cap is $2,500,000, adjusted annually for inflation starting in 2026, with the 2026 limit at approximately $2,560,000. A dollar-for-dollar phase-out begins once total qualifying purchases exceed roughly $4,090,000, which targets the benefit at small and mid-sized businesses.¹

One ceiling matters: you can only deduct up to the taxable income your business generated from active operations that year. If the Section 179 deduction exceeds your business income, the unused portion carries forward rather than creating a loss.¹

Qualifying property includes tangible personal property like machinery and office furniture, off-the-shelf software, and by election, certain real property improvements such as roofs, HVAC systems, fire protection, and security systems.¹

Bonus Depreciation

Bonus depreciation works alongside Section 179 but without the taxable income limitation. If the purchase creates a loss on paper, bonus depreciation still applies in full. The One Big Beautiful Bill Act permanently restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025, ending the prior phase-down that would have reduced the percentage through 2027.²

Eligible property covers new or used tangible personal property with a recovery period of 20 years or less, which sweeps in most equipment, vehicles, furniture, and computers. Used property cannot have been previously used by you and cannot be purchased from a related party.³

Bonus depreciation is especially useful for larger purchases that exceed the Section 179 phase-out threshold, or when your business income is too low for the Section 179 income cap. With 100% now permanent, the planning is simpler: buy qualifying property you need, and deduct the full cost in year one.

Fund a Retirement Plan Before You File

Routing profits into a retirement plan is one of the most powerful reinvestment moves because the money reduces taxable income now and grows tax-deferred. The right structure depends on whether you have employees, how much you want to contribute, and how close you are to retirement.

SEP IRAs

The Simplified Employee Pension IRA is the easiest plan to set up and works well for sole proprietors and small businesses with variable income. Only the employer contributes. The annual limit is the lesser of 25% of compensation or $72,000 for 2026.⁴

The deadline flexibility is the real draw. You can establish and fund a SEP for the prior tax year up to the filing deadline of your business return, including extensions. That means you can calculate final profit, decide how much to shelter, and contribute months after the tax year has closed.⁵

Solo 401(k) Plans

For owner-only businesses, the Solo 401(k) allows the highest total contribution because you contribute from both sides. As the employee, you can defer up to $24,500 in 2026. If you are 50 or older, an additional $8,000 catch-up applies. Owners aged 60 through 63 get an enhanced catch-up of $11,250 instead.⁶

The employer side can contribute up to 25% of W-2 compensation or net self-employment earnings (after deducting half of self-employment tax and the contribution itself). Combined contributions cannot exceed $72,000 for 2026, $80,000 with the standard catch-up, or $83,250 with the enhanced catch-up for ages 60 through 63.⁷⁸

The employer profit-sharing portion is a deductible business expense; the employee deferral reduces personal taxable income. A self-employed person who can maximize both sides typically shelters more through a Solo 401(k) than through a SEP.

Defined Benefit Plans

Older, high-income business owners who want to shelter far more than $72,000 a year should look at a defined benefit pension plan. These plans work backward from a target retirement benefit, and an actuary calculates the annual contribution needed to reach it. Because the number depends on your age, income history, and promised benefit, annual deductible contributions can exceed $100,000 or $200,000. The maximum annual benefit payable from a defined benefit plan in 2026 is $290,000.

The trade-off is complexity. Defined benefit plans require annual actuarial certification and more administrative overhead than a SEP or Solo 401(k),⁹ and you are committing to fund the plan each year. For a business with consistently high profits and an owner within 10 to 15 years of retirement, the tax savings usually dwarf the administrative costs.

Health Savings Accounts

If you are enrolled in a high-deductible health plan, a Health Savings Account offers a triple tax advantage: contributions are deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. For 2026, the contribution limit is $4,400 for self-only coverage and $8,750 for family coverage, plus a $1,000 catch-up at age 55 or older. Smaller numbers than a retirement plan, but the permanent tax-free treatment on qualified withdrawals earns it a slot alongside the larger vehicles.

Prepay Expenses and Stock Inventory

When a profitable year is winding down, buying inventory and prepaying operating expenses are the simplest levers. No special elections, no complex planning.

If you sell goods, purchasing and taking delivery of inventory before year-end increases cost of goods sold and directly reduces net income. Cash leaves the account; profit on the return drops accordingly. This works best when you are buying items you will move within the next few months.

Prepaying annual expenses like software subscriptions, insurance premiums, or maintenance contracts can also pull deductions into the current year. Under the IRS’s 12-month rule, a prepaid expense is deductible in the current year as long as the benefit does not extend beyond the earlier of 12 months after payment or the end of the following tax year. Pay a $12,000 annual software subscription on December 15, and you deduct the full amount this year if the subscription runs through the following December or earlier. A two-year prepayment would not qualify.

Accrual-basis taxpayers face an additional hurdle. The expense must satisfy the economic performance test, meaning the service or property must actually be provided before you claim the deduction. Insurance, warranty contracts, and taxes get an exception in which the payment itself satisfies economic performance.

Reinvest in Research and Development

Putting profits into new products, processes, or software can generate both a deduction and a credit. Credits reduce tax dollar for dollar; deductions only reduce taxable income.

The R&D tax credit under Section 41 equals 20% of qualified research expenses that exceed a calculated base amount. Qualifying costs include wages for employees performing research, supplies consumed in research, and 65% of payments to outside contractors conducting research on your behalf.¹⁰

Startups with less than five years of gross receipts and annual revenue under $5 million can apply the credit against the employer portion of payroll taxes rather than income tax. That makes it useful before the business is profitable enough to owe income tax. The payroll offset is capped at $250,000 per tax type, for a combined maximum of $500,000 per year.

On the deduction side, the One Big Beautiful Bill Act reversed the TCJA rule that had forced businesses to capitalize and amortize research costs. Starting in 2025, domestic research and experimental expenditures are once again fully deductible in the year they are paid or incurred under new Section 174A. Foreign research expenditures must still be capitalized and amortized over 15 years.¹¹

Deploy Profits Into Real Estate

Real estate generates some of the largest non-cash deductions in the code. Property typically appreciates while the IRS lets you claim depreciation as though it were losing value. That gap between economic reality and tax treatment is why real estate is central to serious tax-reduction strategies.

Depreciation and Cost Segregation

Residential rental property is depreciated over 27.5 years and commercial property over 39 years, both straight-line.¹² On a $1 million commercial building, that is roughly $25,600 per year in non-cash deductions that offset rental income and, depending on your situation, other income too.

A cost segregation study accelerates this timeline. An engineer identifies components that qualify for shorter recovery periods: carpeting, cabinetry, certain electrical work, landscaping, and parking lot paving. Reclassifying them from 27.5-year or 39-year property to 5-, 7-, or 15-year property lets you apply bonus depreciation. With 100% bonus depreciation permanent, a cost segregation study can shift 20% to 40% of a building’s basis into an immediate first-year deduction. On a $2 million property, that could mean a $400,000 to $800,000 paper loss in year one.

Like-Kind Exchanges Under Section 1031

When you sell investment real estate at a profit, Section 1031 lets you defer the capital gains tax by reinvesting into replacement property of equal or greater value. The gain is not forgiven; it transfers to the new property through adjusted basis. Keep exchanging, and the tax stays deferred.¹³

The timelines are strict. You have 45 calendar days from the sale closing to identify replacement property in writing. The replacement must be acquired within 180 days of the sale or by the due date of your return for that year, whichever comes first.¹³

A qualified intermediary must hold the sale proceeds during the exchange window. If the funds ever pass through your hands or your bank account, the IRS treats you as having constructive receipt and the exchange fails. This safe harbor is codified in Treasury regulations.¹⁴ For full deferral, the replacement property’s value and debt must equal or exceed those of the property sold; any cash received or debt relieved is taxable boot. If the investor holds the final property until death, the accumulated deferred gain is typically eliminated through the stepped-up basis heirs receive.¹⁵

Real Estate Professional Status

Rental losses are normally passive and can only offset other passive income. For a business owner whose profits come from active operations, those paper losses sit unused unless the owner qualifies as a real estate professional.

Qualifying takes two tests in the same tax year. More than half of your total personal services for the year must be performed in real property businesses in which you materially participate, and you must log at least 750 hours of service in those activities.¹⁶

Once you qualify, your real estate losses reclassify as non-passive. Depreciation from your rental portfolio, including first-year deductions from cost segregation, can then offset business profits, W-2 income, and other ordinary income. Spouses can combine hours to meet the 750-hour threshold, which makes the strategy workable for couples where one manages the properties while the other runs the business.¹⁶

Watch the QBI Deduction Interaction

Pass-through owners (sole proprietors, S corporation shareholders, partners) should think about how reinvestment interacts with the qualified business income deduction. The One Big Beautiful Bill Act made this deduction permanent and increased it from 20% to 23% of qualifying business income for tax years beginning in 2026. Up to 23% of net business profit can be deducted on your personal return before calculating tax.

Here is where the math gets slightly counterintuitive: every deduction that reduces qualified business income also reduces the QBI deduction. Earn $500,000 in profit and take a $72,000 retirement plan deduction, and the QBI deduction is calculated on the remainder, not the full $500,000. The net still favors the deduction. Cutting taxable income by $72,000 saves more than the shrunken QBI benefit costs. But run the numbers, especially for service businesses like law, accounting, or consulting, where the QBI deduction phases out entirely above certain income thresholds.

Invest in Federal Tax Credit Projects

Reinvesting profits into projects that generate federal tax credits offers a dollar-for-dollar offset against your tax bill, which makes credits more valuable per dollar than deductions. The Historic Rehabilitation Tax Credit provides a 20% credit on the cost of rehabilitating certified historic structures used for income-producing purposes.¹⁷ The Low-Income Housing Tax Credit encourages private investment in affordable housing and typically delivers credits over a 10-year period.

These are usually structured as limited partnerships or LLCs that pass credits through to investors. Expect long holding periods, complex syndication agreements, and illiquidity. Most investors in this space are high-income individuals or businesses with steady, predictable tax liabilities large enough to absorb the credits.

The Rule That Governs Every Strategy Above

Every strategy here works only when the underlying investment has a legitimate business purpose beyond cutting taxes. The IRS applies the economic substance doctrine to transactions that appear designed primarily to generate tax benefits. A transaction has economic substance only if it meaningfully changes your economic position apart from the tax effects and you have a substantial non-tax purpose for entering into it.¹⁸

Buying equipment you do not need, funding a retirement plan you plan to raid immediately, or investing in a fund with no genuine interest in the underlying assets all invite scrutiny. The penalty for a transaction the IRS finds lacks economic substance is a 20% accuracy-related penalty on the underpayment, doubling to 40% if you failed to adequately disclose the transaction on your return.¹⁹

Reinvesting profits to reduce taxes is legal and explicitly encouraged by the code. The reinvestment just has to be into something your business genuinely uses, your retirement genuinely needs, or your portfolio genuinely benefits from. Every strategy described above passes that test when implemented properly.

1
Office of the Law Revision Counsel. 26 US Code 179 – Election to Expense Certain Depreciable Business Assets
2
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill
3
Internal Revenue Service. Additional First Year Depreciation Deduction (Bonus) FAQ
4
Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs)
5
U.S. Department of Labor. SEP Retirement Plans For Small Businesses
6
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
7
Internal Revenue Service. One-Participant 401(k) Plans
8
Internal Revenue Service. COLA Increases for Dollar Limitations on Benefits and Contributions
9
Internal Revenue Service. Instructions for Form 15315, Annual Certification for Multiemployer Defined Benefit Plans
10
Office of the Law Revision Counsel. 26 US Code 41 – Credit for Increasing Research Activities
11
Office of the Law Revision Counsel. 26 US Code 174 – Amortization of Research and Experimental Expenditures
12
Internal Revenue Service. Depreciation and Recapture
13
Office of the Law Revision Counsel. 26 US Code 1031 – Exchange of Real Property Held for Productive Use or Investment
14
eCFR. 26 CFR 1.1031(k)-1 – Treatment of Deferred Exchanges
15
Office of the Law Revision Counsel. 26 US Code 1014 – Basis of Property Acquired From a Decedent
16
Internal Revenue Service. Publication 925 – Passive Activity and At-Risk Rules
17
National Park Service. Eligibility Requirements – Historic Preservation Tax Incentives
18
Internal Revenue Service. Notice 2014-58 – Additional Guidance Under the Codified Economic Substance Doctrine and Related Penalties
19
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments