How to File Massachusetts Sales Tax Online

Learn how to file sales tax online in Massachusetts with step-by-step instructions including screenshots.

By
Sam Ross
Sam Ross
Co-founder, Numeral

Prior to Numeral, Sam started numerous e-commerce businesses that have generated over $50M in revenue. However, the headache of filing sales taxes across many states became the basis for starting Numeral. Thousands of filings later, Sam's a pro at ecommerce sales tax.

Reviewed by
Nate Matherson
Nate Matherson
Head of Growth

Nate is the Head of Growth at Numeral. He has founded multiple venture-backed companies and is a two-time Y Combinator Alum. He is based in Charleston, SC.

Published:
March 21, 2026

Step-by-step process for filing Massachusetts sales tax online

Let’s now get right into the steps for filing sales tax in Massachusetts. We’ll start with creating an account and then move to filing the sales tax. If you already have an account on the MassTaxConnect website, you can skip step 1. 

Step 1: Create an online account

The first step in filing your Massachusetts sales tax return is to register for a sales tax permit and create an account on the Massachusetts Department of Revenue's MassTaxConnect website. This platform streamlines the filing process and allows you to manage your tax obligations efficiently.

To begin, click on the "Sign Up" button to create a username and password. If you're a first-time filer, choose the "Register a business" option. 

You'll be presented with the registration requirements; carefully review these and click "Next" to proceed. Select the reason for your signup and click "Next" again.

Now, you'll need to fill out all the required information. This may include your business name, address, contact details, and the type of business you operate. 

Be sure to choose the appropriate options according to your specific needs. Once you've completed a section, click "Next" to move forward. 

Continue this process until you've provided all the necessary information and obtained your login credentials.

Step 2: Login to your account

With your newly created username and password, sign in to your MassTaxConnect account. 

This will bring you to your account dashboard, where you can access various features and options related to your tax obligations.

Step 3: Start your tax return

From your account dashboard, locate the tax account "Summary" tab. This is where you'll initiate the process of filing your return. 

If you're filing for the most recent period, you can simply select the "File Now" link within the "Return" panel. 

However, choose the appropriate period from the "Returns" link in the "Account" panel if you need to file for a different period.

Step 4: Enter tax details

For this example, let's assume you're filing a Sales Tax ST-9 return for the November 2020 period using the "File Now" link. 

After selecting this link, you'll be directed to the return screen. Here, you'll enter the return amounts for the filing period. 

This may include your gross sales, any deductions, and the total amount of sales tax collected.

Double-check your entries to ensure accuracy, and when you've finished entering all the required information, select "Next." This will bring you to the "Make a payment" screen.

Step 5: Submit payment

On the "Make a payment" screen, you'll choose your preferred method of payment. MassTaxConnect offers several convenient options, such as electronic funds transfer, credit card, or check. Select the method that best suits your needs and follow the prompts to complete your payment.

After you've finished answering all the questions and providing the necessary payment information, select "Next." 

You'll be brought to a confirmation screen, which displays a summary of your return and payment details. Carefully review this information to ensure everything is correct.

If you need to make any changes, use the "Back" button to return to the previous screens and make the necessary adjustments.

If everything looks accurate on the confirmation screen, select "Submit" to file your return. Upon submission, you'll receive a confirmation email, which serves as a record of your successful filing.

Step 6: Finalize filing

After submitting your return, you'll receive a confirmation page that you can print or save for your records. This confirmation provides a summary of your filing and serves as proof that you've met your sales tax obligations for the period.

It's a good idea to keep this confirmation, along with any other relevant documentation, in a safe place. This information may be needed for future reference or in the event of an audit.

Local sales tax in Massachusetts

Massachusetts does not have any local sales taxes. This means that the MA sales tax rate is consistent across all cities and towns in Massachusetts, at 6.25%. 

While this simplifies the sales tax process for businesses operating in Massachusetts, you need to stay informed about any potential changes to the state's sales tax laws. Regularly reviewing updates from the Massachusetts Department of Revenue can help ensure ongoing compliance.

Filing Massachusetts Sales Tax FAQs

What is the frequency of sales tax filing in Massachusetts?

The frequency of sales tax filing in Massachusetts varies depending on the volume of your sales. Businesses may be required to file monthly, quarterly, or annually. The Massachusetts Department of Revenue will assign your filing frequency based on your sales tax liability.

Generally, businesses with higher sales volumes will be required to file more frequently. This ensures that the state receives tax revenues promptly and helps businesses avoid accumulating large tax liabilities.

If you're unsure about your filing frequency, you can check your MassTaxConnect account or contact the Department of Revenue for clarification.

Can I file my Massachusetts sales tax return by mail?

While electronic filing through MassTaxConnect is the preferred and most efficient method, Massachusetts does allow businesses to file sales tax returns by mail. To do so, you'll need to use the paper forms provided by the Department of Revenue.

Keep in mind that filing by mail may result in slower processing times compared to electronic filing. It's also important to ensure that your return is postmarked by the due date to avoid any late filing penalties.

If you choose to file by mail, be sure to keep a copy of your return and any supporting documentation for your records. This information may be needed for future reference or in case of any discrepancies.

What happens if I miss the sales tax filing deadline in Massachusetts?

Missing the sales tax filing deadline in Massachusetts can result in penalties and interest charges on the unpaid tax amount. These charges can add up quickly, putting a strain on your business's finances.

The penalty for late filing is 1% of the unpaid tax liability per month, up to a maximum of 25%. Interest charges are also applied to late payments at a rate determined by the Department of Revenue.

Do I need to file a sales tax return in Massachusetts if I didn't make any sales?

Even if your business had no sales or collected no sales tax during a given reporting period, you are still required to file a return if you have an active sales tax permit in Massachusetts. In this case, you would file what's known as a "zero return."

A zero return is a sales tax return that reports no sales and no tax liability for the period. Filing zero returns helps maintain your business's compliance with Massachusetts sales tax laws and keeps your sales tax permit in good standing.

Is SaaS taxable in Massachusetts?

Yes, Massachusetts taxes SaaS products at the normal rate.

Simplify your sales tax compliance with Numeral

Filing sales tax returns in Massachusetts can be a complex and time-consuming process, but it doesn't have to be. Numeral is here to make your life easier by managing all aspects of your sales tax compliance. With our user-friendly platform and expert support, you can spend less time worrying about taxes and more time growing your business.

Numeral monitors your sales 24/7, notifies you when you reach economic nexus, registers your business in the necessary states, manages your tax collection settings, and automates your monthly, quarterly, and annual remittances. Our comprehensive service ensures that you stay compliant with Massachusetts sales tax laws without the hassle.

Don't let sales tax compliance hold you back. Book a demo with Numeral today and see how we can simplify your sales tax process, giving you peace of mind and more time to focus on what matters most—growing your business.

About the author

Sam Ross

Prior to Numeral, Sam started numerous e-commerce businesses that have generated over $50M in revenue. However, the headache of filing sales taxes across many states became the basis for starting Numeral. Thousands of filings later, Sam's a pro at ecommerce sales tax.

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