Most people will overpay taxes in 2026, unless they know these IRS rule changes

A new tax law called the “One Big Beautiful Bill Act” has come into effect and is bringing major changes for taxpayers, especially for 2026. Experts say people who do not update their tax strategy under the new rules could end up paying more tax than needed. High-income earners and people close to retirement are expected to be the most affected by these changes.

Paycheck & withholding changes

Taxpayers are being advised to check their salary tax deductions (withholding) before 2026 begins. The IRS has a “paycheck checkup tool” to help people adjust how much tax is cut from their salary. If withholding is too high, it means the government is holding your money longer without paying interest, as per the report by MarketWatch. Even a quick review of tax settings can help save thousands of dollars over time.

401(k) & Retirement savings update

People aged 60 to 63 will get a special chance to contribute up to $35,750 into their 401(k) in 2026. After age 64, contribution limits will go back to normal levels. From 2026, high earners must make catch-up contributions into Roth accounts instead of traditional ones. This means no tax benefit now, but withdrawals later will be tax-free.

SALT tax deduction relief

The limit on state and local tax (SALT) deductions is being increased from $10,000 to $40,000 between 2026 and 2029. For married couples filing separately, the limit will be $20,000, as stated by MarketWatch. This change will give tax relief to many upper middle-class households. However, if income crosses $500,000 ($250,000 for MFS), the extra benefit starts reducing. At around $600,000 income, the benefit drops back to the old $10,000 cap.

Business owners & salt workaround

Business owners can still use the PTET (pass-through entity tax) workaround to reduce taxes. Around 40 states allow businesses to pay state taxes at the company level instead of personal level, as noted by MarketWatch. This tax is fully deductible as a business expense. It can also help reduce other hidden taxes like investment taxes and Medicare-related charges. However, using this strategy may involve extra paperwork and planning.

Charitable donations rule change

From 2026, charitable donations will only be deductible if they exceed 0.5% of a person’s income (AGI). Smaller donations may no longer give tax benefits. Experts suggest “bunching” donations — giving multiple years’ donations in one year to get better tax benefits. Donor-advised funds can help people claim deductions now and donate later.

Bonus depreciation returns

Businesses can again claim 100% bonus depreciation in 2026. This allows companies to deduct the full cost of equipment or assets in the same year. This rule applies to assets placed in service after January 19, 2026. Businesses planning big purchases may benefit by moving them into 2026.

Qualified business income (QBI)

The 20% Qualified Business Income (QBI) deduction has been made permanent, as cited by MarketWatch. This gives long-term clarity and stability for business owners.

AMT (Alternative minimum tax) Risk

AMT exemption limits remain high, but income thresholds for phaseouts will reduce in 2026. This means more people could fall under AMT rules again. People using Incentive Stock Options (ISOs) may be especially affected. Poor timing of stock option exercises could lead to higher tax bills. Experts say this area requires professional tax planning to avoid costly mistakes.

Many of these tax benefits will not last forever and may end in the next few years. If you do nothing, you will just follow the normal system, which may not help you save much tax. Now, tax planning is not about quick tricks. It is more about planning ahead, choosing the right time, and thinking about the future. Experts say that using many small tax-saving ideas together can help you save a lot of money over time.

FAQs

Q1. What are the new IRS tax changes for 2026?

The 2026 tax changes include higher SALT deduction limits, new 401(k) rules, return of bonus depreciation, and stricter charity deduction rules.

Q2. How can I avoid overpaying taxes in 2026?

You can avoid overpaying by checking your salary tax deductions, planning investments smartly, and using new tax benefits properly.