7 Mistakes You’re Making with Your 2026 Tax Planning (and How to Fix Them)

ORLANDO, FL – JOSE’S TAX SERVICE – MARCH 9, 2026

Listen, I get it. Tax planning isn't exactly the way most people want to spend their Monday afternoon. But we are officially in the 2026 tax season, and things look a lot different than they did a few years ago. Between shifting legislation and the expiration of certain provisions from the Tax Cuts and Jobs Act (TCJA), many of the "old rules" don't apply anymore.

I’m Jose' Morales, CEO of Jose's Tax Service, and I see the same blunders year after year. Most of these mistakes don't just cost you a few bucks: they cost you thousands in missed refunds or, worse, result in a surprise bill from the IRS that comes with interest and penalties.

If you want to maximize your tax refund, you need to stop making these seven common mistakes right now. Here is how to fix them before the filing deadline.

1. Using an Outdated W-4 Withholding Strategy!

One of the biggest mistakes I see at Jose's Tax Service is the "set it and forget it" mentality regarding Form W-4, Employee's Withholding Certificate. If you haven't touched your W-4 since 2024 or 2025, you are likely either over-withholding (giving the government an interest-free loan) or under-withholding (preparing for a massive bill in April).

For 2026, the tax brackets and various deduction caps have shifted. Specifically, with the new $40,000 State and Local Tax (SALT) deduction cap, your overall tax liability might be lower or higher than you anticipate.

The Fix:

• Use the IRS Tax Withholding Estimator: Go to the official IRS website and run your numbers.
• File a new W-4: Submit a revised Form W-4 to your employer immediately if you’ve had a life change: like a marriage, a new child, or a secondary income stream.
• Account for the SALT change: If you are in a high-tax state, your federal taxable income might be lower than previous years due to the increased deduction cap. Adjust your withholding to keep more of your paycheck now.

2. Claiming the Standard Deduction When Itemizing Is Better!

For years, the standard deduction was so high that nearly 90% of taxpayers didn't bother itemizing. However, for the 2026 tax year, the math has changed for many homeowners and high-income earners. The State and Local Tax (SALT) deduction cap has officially increased to $40,000: a massive jump from the previous $10,000 limit.

If you live in a state with high property taxes or high state income tax, you might suddenly find that your total itemized deductions blow the standard deduction out of the water.

The Fix:

• Gather all receipts: Collect records for mortgage interest, charitable contributions, and medical expenses exceeding 7.5% of your Adjusted Gross Income (AGI).
• Run a comparison: At Jose's Tax Service, we always model both scenarios. Do not assume the standard deduction is your best bet.
• Review Schedule A (Form 1040): Familiarize yourself with the categories on Schedule A to ensure no deductible expense is overlooked. You can find more news and updates on these forms on our website.

3. Ignoring Tax-Efficient Investment Placement!

I often see clients who have great investments but terrible "asset location." Holding tax-heavy investments, such as high-yield bonds or actively managed mutual funds that kick off frequent capital gains, in a standard taxable brokerage account is a recipe for a high tax bill.

The Fix:

• Relocate your assets: Aim to keep tax-inefficient investments inside tax-deferred accounts like a 401(k) or an Individual Retirement Account (IRA).
• Prioritize growth in taxable accounts: Keep long-term stocks or tax-managed ETFs in your taxable accounts where they can benefit from lower long-term capital gains rates.
• Consult a pro: If you aren't sure how your portfolio is taxed, this is where Virtual Tax Preparation can help. A concierge pro can look at your 1099-B and 1099-DIV forms to suggest a more efficient setup for next year.

4. Failing to Make Estimated Tax Payments!

If you are a freelancer, a small business owner, or someone with significant investment income, waiting until April to pay your taxes is a mistake. The IRS operates on a "pay-as-you-go" system. If you don't pay enough throughout the year, you will be hit with underpayment penalties.

The Fix:

• Follow the Safe Harbor Rules: To avoid penalties, ensure you pay at least 90% of your current year’s tax liability or 100% of last year’s tax liability (110% if your AGI was over $150,000).
• Use Form 1040-ES: Calculate and mail your estimated payments quarterly.
• Annualize your income: If your income is seasonal, use Form 2210, Underpayment of Estimated Tax by Individuals, Estates, and Trusts, to potentially reduce penalties by showing the IRS you earned your money later in the year.

5. Renting Property to Family Without Proper Documentation!

This is a "kindness trap" that gets many of my clients into trouble. If you rent a second home or a condo to a family member at a "friends and family" discount (below market rate), the IRS may classify that property as personal-use rather than a rental business. This effectively kills your ability to deduct depreciation, repairs, and utilities.

The Fix:

• Charge Fair Market Value (FMV): Research comparable rents in the area and charge your family member that amount.
• Keep it separate: If you want to help them out, charge FMV for the rent and, if you choose, give them a separate cash gift (within the annual gift tax exclusion limits).
• Document everything: Have a formal lease agreement and keep a paper trail of all payments.

6. Overlooking State-Specific Tax Credits and Deductions!

Federal taxes get all the headlines, but state taxes can be just as complex. Many taxpayers assume that if something isn't deductible on their federal return, it isn't deductible on their state return. This is a mistake. Many states offer unique credits for things like energy-efficient home improvements, 529 plan contributions, or even specific small business activities.

The Fix:

• Research your state's tax department: Check the official website for your state's Department of Revenue.
• Document your residency: If you moved during 2026, keep records of your driver’s license issuance, voter registration, and the number of days spent in each state. States are becoming more aggressive about auditing "tax flight."
• Check for new 2026 credits: Many states have introduced new "working family" or "green energy" credits this year. You can stay informed by checking our tax update pages.

7. Underestimating the Value of the Home Office Deduction!

I hear it all the time: "Jose, the home office deduction is a red flag for an audit." While that may have been true twenty years ago, it is a perfectly legitimate deduction for the millions of Americans who now work for themselves. The mistake people make isn't just taking the deduction: it's failing to realize what the deduction unlocks.

The Fix:

• Establish a "Principal Place of Business": When your home office qualifies as your primary place of business, your "commute" from your home office to a client’s site or the post office becomes deductible business mileage.
• Choose your method: You can use the simplified method ($5 per square foot up to 300 square feet) or the actual expense method. If you have a high mortgage or high utility bills, the actual expense method usually yields a bigger break.
• Maintain exclusivity: Ensure the space is used exclusively and regularly for business. A desk in the corner of a playroom does not count.

How Jose's Tax Service Can Help You Fix These Mistakes

Tax laws are constantly evolving, and 2026 is a pivotal year. Trying to navigate these changes on your own is like trying to fly a plane while reading the manual. You might get off the ground, but the landing is going to be rough.

Whether you are looking for a tax preparer near you or you prefer the convenience of virtual tax preparation, we have you covered. Our concierge service is designed specifically for small business owners and individuals who want a professional to handle the heavy lifting while they focus on what they do best.

Immediate Action Steps:

1. Review your 2025 return: Look for areas where you paid penalties or missed out on itemizing.
2. Organize your digital files: Create a folder for all 2026 tax documents, including the new 1099s that will start arriving soon.
3. Schedule a consultation: Don't wait until April 14th. The best tax planning happens before the filing deadline.

Final Reminder: The deadline to file your 2025 tax return (filed in 2026) is Wednesday, April 15, 2026. If you need an extension, you must file Form 4868 by that date. However, remember that an extension to file is not an extension to pay. Any taxes owed must still be paid by the April deadline to avoid interest.

Stay proactive, keep your receipts, and let’s make 2026 your most tax-efficient year yet!

Jose Morales
CEO, Jose's Tax Service