Employees commonly have federal and Massachusetts income taxes withheld from their paychecks throughout the year. Self-employed individuals and some business owners can face a different situation.

When sufficient tax is not being withheld from income, estimated tax payments may be required.

Understanding estimated taxes is particularly important for independent contractors, freelancers and business owners because income can change substantially during the year. A payment calculation made early in 2026 may no longer reflect the same financial circumstances by October.

For taxpayers in Revere, Chelsea, Everett, Lynn, East Boston, Medford and other Massachusetts communities, the final months of the year are a useful time to review what has already been paid and what remains ahead.

Estimated Taxes Are Payments Made During the Year

The federal income tax system generally expects taxes to be paid as income is earned rather than only when an annual return is filed.

Employees often accomplish this through withholding.

Individuals who receive income that is not adequately covered by withholding may instead need to make estimated payments.

Self-employment income is a common example, but estimated tax questions can arise from other types of income as well. The actual requirement depends on the taxpayer’s complete situation rather than simply whether someone describes themselves as self-employed.

That is why taxpayers should calculate their obligations using current information instead of assuming that everyone with independent income follows exactly the same payment pattern.

Federal Estimated Tax Has Four Payment Periods

The IRS divides the year into four estimated-tax payment periods.

For 2026, the general federal installment dates are April 15, June 15, September 15 and January 15, 2027.

As of October, the first three general dates have already passed. The remaining general installment date for the September-through-December payment period is January 15, 2027.

The IRS also explains that underpayment of required installments can result in a penalty, even in some situations where the taxpayer later receives a refund when filing the annual return.

Official information about the schedule and applicable rules is available from the IRS Estimated Tax guidance.

Massachusetts Has a Separate Estimated Tax System

Massachusetts taxpayers must also consider state estimated taxes.

For 2026, the Massachusetts Department of Revenue lists installment dates of April 15, June 16, September 15 and January 15, 2027 for personal income and fiduciary estimated tax payments.

The state generally describes each installment as 25% of the required annual payment, although the actual requirements applicable to an individual taxpayer depend on the circumstances.

Federal and state estimated taxes should therefore not be treated as a single payment.

They involve different tax authorities, calculations and payment systems.

Current Massachusetts requirements can be reviewed through the Massachusetts Department of Revenue estimated tax guidance.

Why Income Changes Matter

Self-employed income does not always arrive evenly throughout the year.

A contractor may have a particularly strong summer. A consultant may sign a major client late in the year. A small business may experience seasonal revenue. Another business may have lower income than originally expected.

These changes matter because estimated tax calculations depend on financial information.

If actual 2026 income differs significantly from what was anticipated earlier in the year, reviewing the current situation before the final installment date can help a taxpayer understand whether previous assumptions still make sense.

The appropriate calculation depends on individual circumstances and applicable tax rules. It should not be based on an arbitrary percentage copied from another taxpayer.

Accurate Bookkeeping Becomes Especially Important

Estimating taxes is difficult when the business owner does not know how much the business has actually earned.

This is another reason bookkeeping and tax planning are closely connected.

Current records can help identify business income and expenses through the latest accounting period. Without those records, an owner may be trying to estimate a tax obligation while simultaneously estimating the company’s financial performance.

That introduces unnecessary uncertainty.

For self-employed individuals and small businesses in Revere, Everett, Chelsea, Lynn, East Boston and Medford, maintaining current books can make conversations about estimated taxes considerably more useful.

ND Professional Services provides tax preparation, tax planning and accounting services for individuals and businesses in Massachusetts.

Do Not Confuse Gross Revenue With Taxable Income

A business receiving $100,000 during the year does not automatically have $100,000 of taxable business income.

At the same time, business owners should not assume that every dollar spent by the business automatically reduces taxable income.

Tax calculations depend on the applicable rules and the taxpayer’s actual facts.

This is one reason accurate categorization matters. Bookkeeping should distinguish different types of transactions so the information can later be evaluated correctly during tax preparation.

Using the business bank balance or total deposits as a substitute for proper accounting can produce an incomplete financial picture.

What Happens After the January Payment?

January 15, 2027 is not the end of the tax process.

After the calendar year closes, taxpayers still need to prepare their 2026 income tax returns and reconcile their actual tax liability with withholding, estimated payments and other applicable credits or payments.

The estimated payments made during the year are part of that calculation.

This makes recordkeeping important. Taxpayers should maintain accurate information about payments made to both the IRS and Massachusetts DOR so those amounts can be properly accounted for when preparing the return.

Planning Ahead Instead of Reacting to Deadlines

Estimated taxes become more difficult when taxpayers think about them only a few days before a payment date.

A better approach is to maintain current financial records and periodically review whether income or other circumstances have changed.

October provides a useful opportunity to do that because much of 2026 has already occurred while there is still time before the January installment date.

Taxpayers should remember that estimated tax requirements are highly dependent on individual circumstances. This article provides general educational information and is not a calculation of what any particular taxpayer owes.

For professional assistance with tax preparation, tax planning, bookkeeping and accounting, visit ND Professional Services.

For authoritative information about estimated taxes, consult the IRS and Massachusetts Department of Revenue directly.