4 Last-Minute Tax Tips for Small Business Owners

If you are feeling the pressure of tax season, you are not alone. Every year, we hear business owners say, “I wish I had planned earlier.”

Ideally, tax planning happens throughout the year. However, there may still be opportunities to lower your taxable income, uncover overlooked deductions, or prevent filing errors before submitting your return.

Here are four last-minute tax tips for small business owners to discuss with their tax professional.

1. Review Your Retirement Contribution Options

Depending on your retirement plan and eligibility, you may still be able to make a contribution for the prior tax year.

Potential options include:

SEP IRA contributions
Certain Solo 401(k) contributions
Traditional IRA contributions

Retirement contributions can help you build long-term savings, and some contributions may reduce your taxable income. However, the deadlines, contribution limits, and deduction rules differ by plan.

For example, the IRS generally allows SEP contributions to be deposited by the due date of the business’s federal income tax return, including extensions. Traditional IRA contributions generally must be made by the individual return’s original filing deadline, without extensions.

Solo 401(k) rules are more complicated. A business owner may contribute as both an employee and an employer, but the timing depends on the type of contribution, when the plan was established, and whether a deferral election was made on time.

Before making a contribution, confirm:

Which type of retirement plan you have
Whether you are eligible to contribute
How much you can contribute
Whether the contribution will be deductible
Which deadline applies to the contribution

If your business had a stronger year than expected, ask your tax and financial professionals whether an additional retirement contribution could be part of your tax strategy.

2. Find and Record Overlooked Business Expenses

Missing deductions often happen because records are incomplete, purchases were made from a personal account, or transactions were categorized incorrectly.

Before filing, review your business bank and credit card accounts carefully. If you occasionally paid business expenses from a personal account, review those statements as well.

Potential business expenses may include:

Accounting and professional fees
Advertising and marketing
Business insurance
Business-related software and subscriptions
Contract labor
Continuing education
Equipment and office supplies
Internet and phone expenses
Mileage and other vehicle expenses
Qualifying business meals
Rent or coworking fees
Shipping and postage
Travel related to business activities

An expense is not automatically deductible just because it appears on this list. Generally, business expenses must meet IRS requirements and be properly documented.

Pay special attention to recurring subscriptions and online purchases. These expenses can be easy to miss when they are charged to a personal card or processed through a digital payment platform.

Do not estimate or create expenses simply to reduce your tax bill. Gather receipts, invoices, mileage logs, and other documentation that supports each legitimate business expense.

3. Consider an HSA Contribution If You Are Eligible

If you were covered by an eligible high-deductible health plan, you may be able to contribute to a Health Savings Account for the prior tax year.

Eligible HSA contributions can provide valuable tax advantages. Contributions made directly by an eligible taxpayer may be deductible, while the money in the account can be used for qualified medical expenses.

The IRS generally permits prior-year HSA contributions through the unextended federal income tax filing deadline. Your available contribution amount will depend on factors such as:

Your eligibility during the year
Whether you had self-only or family coverage
How many months you were eligible
Contributions made by your employer
Your age
The annual contribution limit

When making a contribution after December 31, make sure your HSA provider records it for the correct tax year.

HSA eligibility and contribution calculations can become complicated if your health coverage changed during the year. Confirm your eligibility and remaining contribution limit before depositing money.

4. Confirm That Estimated Tax Payments Were Applied Correctly

If you made quarterly estimated tax payments, verify that every payment appears on your tax records and is applied to the correct taxpayer and tax year.

Missing or incorrectly applied payments can make it appear that you owe more than you actually do. They may also cause delays while the discrepancy is corrected.

Compare the payments entered on your return with:

Bank statements
Payment confirmation emails
Electronic Federal Tax Payment System records
IRS Direct Pay confirmations
Your IRS Online Account
Records supplied by your tax professional

The IRS Online Account allows individual taxpayers to review their payment history, including estimated tax payments. If you made state estimated payments, check those separately through your state’s tax agency.

If you file jointly, also confirm which spouse’s Social Security number was used when payments were submitted. A payment made under the wrong taxpayer identification number may not appear where expected.

Complete a Final Tax Return Review

Tax-saving opportunities are important, but accuracy matters too. Before authorizing your return for filing, review the information carefully.

Double-check:

Your name and address
Social Security numbers
Your business name and EIN
Business income
Estimated tax payments
Bank routing and account numbers
Retirement and HSA contributions
Business expenses and supporting documentation
Forms received from clients, banks, payroll providers, and payment platforms

Even a small error can delay a refund, misdirect a payment, or result in an IRS notice.

Can You Still Reduce Your Tax Bill After the Year Ends?

Some tax-saving decisions must be completed before December 31. Others may still be available during tax season, depending on the account, deadline, business structure, and individual circumstances.

That is why it is important to review your options before filing instead of assuming it is too late.

However, last-minute tax savings should not replace year-round tax planning. When your books are accurate and current, you have more time to evaluate your income, plan contributions, organize deductions, and prepare for estimated payments.

Make Next Tax Season Easier

The best time to prepare for tax season is throughout the year.

Accurate bookkeeping and regular financial reviews help you understand how your business is performing, anticipate your tax obligations, and make informed decisions before important deadlines pass.

EA Accounting Solutions can help you clean up your books, organize your financial records, and build a better system for the year ahead.

This article provides general educational information and is not individualized tax, legal, or investment advice. Contribution limits, deadlines, eligibility requirements, and tax treatment vary. Consult a qualified tax or financial professional before making a contribution or filing your return.

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