New Tax Law Changes for 2025: What Small and Medium Sized Businesses Need to Know

Small business owners are facing some of the most significant changes to the U.S. tax code in years. With major new legislation that alters depreciation, deductions, and other key tax provisions, it’s critical for SMB owners to understand how these updates can affect tax planning, bottom line, and financial strategy.

Major Legislative Changes in 2025

In mid-2025, Congress passed a broad tax and spending bill — commonly referred to as the One Big Beautiful Bill Act — that includes sweeping changes to federal tax law. Many of these provisions affect small businesses directly, especially pass-through entities like LLCs, S-corporations, and sole proprietorships.

Pass-Through Business Tax Breaks Are Now Permanent

One of the biggest victories for small businesses this year is that the Qualified Business Income (QBI) deduction has been made permanent. This means eligible pass-through business owners continue to deduct up to 20% of qualified business income against their personal tax return. That stability gives you more confidence for long-term planning.

Expanded Capital Investment Deductions

Bonus Depreciation is Back at 100%

The law restores 100% bonus depreciation for qualifying business assets placed in service after January 19, 2025. This means you can write off the full cost of eligible equipment, machinery, and certain property in the year you place it in service — accelerating tax savings and boosting cash flow.

Higher Section 179 Limits

Small businesses can now take advantage of higher Section 179 expensing limits, allowing immediate write-offs for qualifying property. This increased threshold gives you more flexibility to reinvest in your business without deferring deductions.

Expanded Deductions for R&D and Production Property

The 2025 tax changes also broaden how businesses can expense certain activities:

Research & Development (R&D) costs can now be deducted in full in the year they are incurred, instead of being capitalized and amortized over multiple years — a change that particularly benefits startups and innovation-focused firms.
A new elective 100% bonus depreciation for qualified production property (QPP) now allows businesses in manufacturing, agriculture, and related industries to take full deductions for eligible capital property placed in service through 2030.

State and Local Tax (SALT) Deduction Cap Temporarily Increased

Previously capped at $10,000, the SALT deduction cap is temporarily increased up to $40,000 for tax years starting in 2025, with a phase-out for higher-income taxpayers. This is particularly important for business owners living in high-tax states, as it affects your personal side of the tax return.

Other Notable Changes Impacting SMBs

Here are a few additional items that small business owners should be aware of:

Bonus Depreciation for Production Property

Beyond standard equipment and tangible business assets, the tax law now allows 100% depreciation for Qualified Production Property (QPP), encouraging investment in U.S. production activities.

QSBS (Qualified Small Business Stock) Rules Are Expanded

If you or your investors hold Qualified Small Business Stock, you may benefit from new holding period and exclusion rules that increase the potential tax-free gain on sales of eligible stock.

Planning Tips for Small Business Owners

With these changes in play, here are some strategic takeaways:

Accelerate capital purchases now if you plan to expand equipment or facilities to maximize bonus depreciation and Section 179 deductions.
Review your entity structure and income timing to make the most of the permanent QBI deduction.
Consider R&D and production-related investments this year to take advantage of full expensing.
Monitor your SALT deductions if you reside in a high-state tax area. Prepayment of certain state tax obligations may help maximize this temporary cap.

Every business is different, so tailored planning with a qualified tax professional can help you apply these changes strategically to your situation.

Need Help Navigating These New Rules?

Tax laws are complex – and staying up to date can make a real difference in what you owe. Simpson & Simpson Accounting LLC is here to help you understand how the 2025 tax law changes impact your business and what steps you should take before year-end.