7 Mistakes You’re Making with Your Mid-Year Tax Planning (and How to Fix Them Now)

NEW HAVEN, CT : JOSE'S TAX SERVICE : JUNE 2, 2026

Tax planning is an ongoing regulatory requirement, not a seasonal event. As of June 2026, the midpoint of the fiscal year provides a critical window for adjustments. Failing to perform a mid-year audit often results in unexpected liabilities, underpayment penalties, and missed opportunities for tax optimization.

At Jose’s Tax Service, we serve as your concierge tax pro, ensuring your financial strategy aligns with current IRS regulations and state-specific laws in Connecticut. Review the following seven common mistakes and implement the corrective actions immediately to maximize tax refund potential and maintain compliance.

1. Maintaining Obsolete Withholding and Estimated Payment Rates!

Many taxpayers allow their withholding or estimated payments to remain on "autopilot" based on 2025 data. This is a critical error. For the 2026 tax year, income levels and legislative changes have altered the required payment amounts.

The Risk: Underpayment of tax may lead to penalties under Section 6654 of the Internal Revenue Code.
The Solution: Recalculate your projected total tax for 2026. If you are an employee, submit a revised Form W-4, Employee's Withholding Certificate, to your employer. If you are self-employed or have significant non-wage income, adjust your remaining Form 1040-ES, Estimated Tax for Individuals, payments for the Q3 (September 15) and Q4 (January 15) deadlines.

Instructional Steps:

1. Aggregate all year-to-date (YTD) paystubs.
2. Calculate the total tax withheld to date.
3. Use the IRS Tax Withholding Estimator or consult with a professional at our New Haven office to determine if your current trajectory meets the "safe harbor" rules (generally 90% of current year tax or 100% of prior year tax).

2. Utilizing 2025 Income as a 2026 Forecast!

Relying on last year's financial performance as a proxy for 2026 is a fundamental planning failure. Mid-year is the point where projections and actual financial data begin to diverge significantly.

The Risk: Significant income increases (20% or more) can trigger higher tax brackets and the Net Investment Income Tax (NIIT), leading to a cash flow crisis in April.
The Solution: Perform an "Annualization of Income" analysis.
Instructional Steps:

1. Pull a formal Profit and Loss (P&L) statement for January 1 through May 31.
2. Identify new revenue streams, contracts, or bonuses received YTD.
3. Document any major capital expenditures that qualify for immediate expensing or bonus depreciation.
4. Update your 2026 tax projection based on these actual figures rather than historical estimates.

3. Neglecting SECURE 2.0 and Retirement Contribution Adjustments!

The SECURE 2.0 Act introduced several provisions that take effect or reach full implementation in 2026. Failing to adjust your retirement strategy ignores powerful tools for lowering your Adjusted Gross Income (AGI).

The Risk: High-wage earners may face new mandatory Roth catch-up rules. Specifically, if your 2025 wages exceeded $150,000, any catch-up contributions to your 401(k) or 403(b) must now be made on a Roth (after-tax) basis.
The Solution: Verify your plan eligibility and contribution limits for 2026.
Instructional Steps:

1. Confirm the 2026 SIMPLE IRA deferral limit of $17,000.
2. For solo 401(k) holders, ensure you are on track to meet the $72,000 combined limit (excluding catch-ups).
3. If subject to the Roth catch-up rule, coordinate with your payroll department to ensure proper coding of contributions.
4. Schedule a consultation to review your retirement asset allocation for tax efficiency.

4. Allowing Capital Gains and Losses to Accrue Without Strategy!

Passive management of investment portfolios often results in unnecessary tax friction. Mid-year is the optimal time for "Tax-Loss Harvesting."

The Risk: Realizing short-term capital gains without offsetting them with losses can result in a tax rate as high as 37%, plus the 3.8% NIIT.
The Solution: Proactively manage your brokerage accounts to offset gains.
Instructional Steps:

1. Identify "underwater" positions in your taxable accounts.
2. Sell losing positions to offset realized gains.
3. Be mindful of the "Wash Sale" rule; do not repurchase the same or substantially identical security within 30 days.
4. Coordinate your investment moves with your overall income bracket to stay within the 0% or 15% long-term capital gains rates if possible.

5. Overlooking OBBBA Changes to SALT and Senior Deductions!

The Omnibus Budget and Balanced Budget Act (OBBBA) has significantly altered the deduction landscape for 2026.

The Risk: Many taxpayers in New Haven are still operating under the old $10,000 State and Local Tax (SALT) cap. For 2026, this cap has increased to $40,000 for taxpayers with an AGI below $500,000.
The Solution: Re-evaluate your decision to itemize vs. take the standard deduction.
Instructional Steps:

1. Calculate your projected state income tax, local property taxes, and sales taxes.
2. If the total exceeds the standard deduction and falls under the new $40,000 cap, begin organizing receipts for itemization on Schedule A.
3. If you are age 65 or older, factor in the new $6,000 senior deduction provided by OBBBA.
4. Note the new charitable deduction threshold: only donations exceeding 0.5% of your AGI are now deductible. Plan larger, concentrated "bunched" donations if necessary.

6. Neglecting Business Housekeeping and New 1099 Thresholds!

For small business owners in New Haven, mid-year is the deadline for cleaning up accounting records. Proper documentation is the only defense against an IRS audit.

The Risk: The federal reporting threshold for Form 1099 has been adjusted to $2,000 for the 2026 tax year. Failure to track vendor payments accurately can lead to non-compliance penalties.
The Solution: Audit your bookkeeping and vendor files.
Instructional Steps:

1. Reconcile all business bank and credit card accounts through May 31.
2. Use a dedicated system to track expenses; browse our small business learning center for tips on record-keeping.
3. Ensure you have a Form W-9 on file for every contractor paid over $2,000 YTD.
4. Document all capital purchases, especially those placed in service after the January 19, 2025, OBBBA bonus depreciation cut-off.

7. Delaying a Professional Mid-Year Consultation!

The most common mistake is waiting until January to speak with a tax professional. By then, most tax-saving strategies are legally unavailable.

The Risk: Missing the December 31 deadline for many deductions and retirement contributions.
The Solution: Engage with a concierge tax pro now to build a roadmap for the remainder of the year.
Instructional Steps:

1. Gather your 2025 tax return and your 2026 YTD financial documents.
2. Identify upcoming life changes: marriage, the birth of a child, home purchase, or business expansion.
3. Schedule a mid-year strategy session. Proactive planning is the only way to maximize tax refund outcomes.

Summary Checklist for June 2026

• File: Revised Form W-4 if withholding is insufficient.
• Enter: All YTD transactions into your bookkeeping software.
• Use: The new $40,000 SALT cap in your projections.
• Double-check: Retirement contribution rates against 2026 SECURE 2.0 limits.
• Verify: Contractor W-9 forms for the new $2,000 reporting threshold.

Failure to act on these items may lead to penalties and increased tax liability. For personalized assistance, contact Jose’s Tax Service today. We offer both virtual and in-person appointments to ensure your tax strategy is robust and compliant.

Note: All clients of Jose's Tax Service receive up to $1 million in tax audit defense coverage through our ProtectionPlus program, providing essential peace of mind in an evolving regulatory environment.