For many Massachusetts taxpayers, April 15 is the date most closely associated with tax season. However, taxpayers who properly obtained an extension have another important date approaching: October 15, 2026.

The October deadline can be especially important for individuals who needed additional time to organize tax documents, reconcile income records, obtain missing information, or complete a return accurately. As the deadline approaches, taxpayers in Revere, Chelsea, Everett, Lynn, East Boston, Medford and surrounding Massachusetts communities should understand what an extension actually provides — and what it does not.

An extension generally provides additional time to file a tax return. It does not automatically provide additional time to pay taxes that were originally due.

Understanding that distinction is one of the most important steps when approaching the October filing deadline.

What Is the October 15, 2026 Federal Tax Deadline?

For most individual calendar-year taxpayers, the federal deadline for filing a 2025 income tax return was April 15, 2026.

The IRS states that taxpayers who timely requested a six-month extension have until October 15, 2026 to file their federal individual income tax return. The IRS also makes clear that the extension gives taxpayers additional time to file their return, rather than additional time to pay taxes originally due.

That difference matters.

A taxpayer who received an extension but still had a balance due was generally expected to pay the amount owed by the original April deadline. Depending on the taxpayer’s circumstances, unpaid balances can result in interest and applicable penalties.

This is why taxpayers approaching October 15 should not assume that obtaining an extension postponed every part of their tax obligation.

The official IRS information regarding filing extensions is available through the IRS extension guidance.

Massachusetts Has Its Own Extension Requirements

Massachusetts taxpayers also need to consider their state return separately from their federal return.

For tax year 2025, the Massachusetts Department of Revenue states that qualifying personal income tax returns on extension are due on or before October 15, 2026.

Massachusetts rules should not simply be assumed to mirror federal procedures. In fact, the Massachusetts Department of Revenue specifically states that filing an extension with the IRS does not count as filing an extension for Massachusetts.

For Massachusetts personal income tax purposes, DOR explains that taxpayers generally receive an automatic six-month extension when the applicable requirements are satisfied, including payment requirements. According to current DOR guidance, at least 80% of the tax liability generally must have been paid by April 15, 2026 through payments, withholding and credits for the personal income tax extension to be valid.

The state’s extension rules, payment requirements and applicable forms can be reviewed directly through the Massachusetts Department of Revenue.

This distinction between federal and Massachusetts requirements is one reason taxpayers should review both sides of their filing situation instead of treating an extension as a single universal deadline.

What Should You Review Before Filing an Extended Return?

Additional filing time can be useful, but the goal should be an accurate and complete return.

Before an extended return is prepared, taxpayers should make sure that the information used to prepare it reflects their actual tax situation for the year. That can include reviewing income documents, business records, eligible expenses, prior payments and other documentation relevant to the return.

For someone who operated a business or worked independently during 2025, this review may require more than collecting a W-2.

Business income and expenses may need to be reconciled. Payments made during the year should be reviewed. Bookkeeping records may need to be compared with bank or financial records. Estimated tax payments should also be accounted for correctly.

These issues are particularly important when financial activity comes from several sources.

A rushed return prepared from incomplete records can create unnecessary problems later. Using the extension period to organize records properly can therefore be valuable, but taxpayers who are still unfinished in October have much less time remaining to resolve missing information before the extended filing deadline.

Business Owners May Need More Than Tax Preparation

For small business owners, preparing a tax return often exposes the quality of the bookkeeping completed during the previous year.

If transactions were not categorized consistently, income records are incomplete, business and personal activity became mixed, or accounts were not regularly reconciled, preparing the return can become considerably more complicated.

That is why bookkeeping and tax preparation should not be viewed as completely unrelated activities.

Organized accounting records can help a business understand what occurred financially during the year while providing the information needed for tax preparation. Waiting until immediately before a filing deadline to reconstruct an entire year of financial activity can make it more difficult to identify missing records or inconsistencies.

ND Professional Services provides accounting and tax preparation services for individuals and businesses in Massachusetts. For business owners approaching an extended filing deadline, reviewing the underlying books before completing the return can be an important part of the preparation process.

Payroll and Business Records Deserve Attention Too

Businesses with employees can have additional recordkeeping responsibilities that extend beyond the owner’s individual income tax return.

Payroll records, employee compensation information and tax deposits should be maintained accurately throughout the year. Businesses may also have bookkeeping records involving accounts receivable, accounts payable, sales activity and other financial transactions.

These records are useful for more than tax filing.

Accurate bookkeeping can help a business owner understand outstanding obligations, money owed to the business, operating expenses and the financial position of the company. It can also make conversations with a tax preparer more productive because the underlying information is already organized.

For local businesses in communities such as Revere, Everett, Chelsea, Lynn, East Boston and Medford, October can therefore serve as both a filing deadline and a reminder to review bookkeeping practices before another year comes to an end.

What If You Filed an Extension but Still Owe Taxes?

One of the most common misunderstandings about extensions is the belief that the October deadline also postponed the original payment deadline.

The IRS states that an extension of time to file does not provide additional time to pay. Federal taxes owed for a 2025 individual return generally remained due by April 15, 2026.

Massachusetts follows a similar fundamental distinction: an extension to file does not extend the deadline for paying tax due.

A taxpayer who discovers an unpaid balance should therefore avoid assuming that nothing needs to be done until the return is filed. The appropriate course depends on the taxpayer’s individual circumstances, amounts already paid and the applicable federal and state requirements.

Taxpayers can review federal balances and payment information directly through IRS.gov and Massachusetts obligations through MassTaxConnect.

October Is Also a Good Time to Think About the Next Tax Season

Completing an extended 2025 return should not necessarily be the end of the financial review.

By October 2026, most of the current calendar year has already passed. That means taxpayers and business owners have an opportunity to look at their 2026 records while there is still time remaining in the year.

For a small business, this might mean determining whether bookkeeping is current, whether income and expenses have been properly recorded, whether accounts are reconciled and whether records needed for year-end reporting are organized.

For self-employed taxpayers and others who may have estimated tax obligations, it can also be useful to review payments already made during 2026.

Massachusetts DOR’s current calendar states that the fourth 2026 personal estimated tax installment is due January 15, 2027. Whether estimated payments are required, and the appropriate amount, depends on the taxpayer’s circumstances.

This is where tax preparation and tax planning become different activities. Preparation focuses primarily on reporting what already happened. Planning looks forward and considers the tax consequences of financial activity before the year is over.

Local Tax Preparation for Revere and Greater Boston Communities

Tax questions are often personal to the taxpayer or business involved. Two people living in the same Massachusetts community may have very different filing requirements depending on their income sources, employment, business activity and other circumstances.

ND Professional Services provides tax preparation, accounting and related business services from Revere and serves clients in several Greater Boston communities, including Chelsea, Everett, Lynn, East Boston and Medford.

The objective of professional tax preparation should not simply be completing forms quickly. It should begin with organized information, careful preparation and attention to the federal and Massachusetts requirements that apply to the return being filed.

Taxpayers approaching the October 15 deadline should therefore avoid waiting until the final hours to begin reviewing missing documents or unresolved bookkeeping issues.

Preparing for October 15, 2026

If you received a valid extension for your 2025 return and have not yet filed, October is the time to complete the process.

Gather the documents relevant to your return, review payments already made, make sure business records are current when applicable, and address missing information before the deadline becomes urgent.

Most importantly, remember that federal and Massachusetts tax requirements are related but separate. A federal extension should not be treated as proof that every Massachusetts requirement has automatically been satisfied.

For professional assistance with tax preparation, bookkeeping, accounting and business services, visit ND Professional Services to learn more about the services available.

Tax rules depend on individual circumstances and can change. For current filing requirements and deadlines, taxpayers should consult official IRS and Massachusetts Department of Revenue guidance or an appropriate tax professional.