Massachusetts Form ST-9A is the Annual Sales and Use Tax Return that small vendors with a total yearly sales and use tax liability of $100 or less file with the Massachusetts Department of Revenue once a year, instead of filing the monthly or quarterly Form ST-9. The form reports gross sales, taxable sales, sales tax collected, and use tax owed on out-of-state purchases for the full calendar year, and it must be filed even if no tax was collected.
Filing late, filing on the wrong form, or skipping the use tax line are the three most common ways small vendors lose money on this return. The Massachusetts DOR processes more than 3.4 million business tax returns every year, and sales and use tax filings make up the largest share, with the agency reporting that roughly one in seven small-vendor returns arrives late or with a math error that triggers a notice.
Here is what you will learn in this guide:
- 📅 The exact due date, eligibility rules, and how ST-9A differs from ST-9
- 🧾 A line-by-line walkthrough of every box on the form with sample entries
- 👥 Three full filled-out examples using real small-business scenarios
- 💻 Step-by-step filing through MassTaxConnect, by paper, and by amended return
- ⚠️ The 10 most common ST-9A mistakes, the penalties they trigger, and how to avoid them
What Form ST-9A Is and Who Must File It
Form ST-9A is the short, once-a-year version of the Massachusetts sales and use tax return, designed for the smallest vendors in the state. The Massachusetts DOR built it under the authority of Massachusetts General Laws Chapter 64H for sales tax and Chapter 64I for use tax, with administration rules in Chapter 62C. The current revision of the form is dated Rev. 3/15 on the official PDF, and the DOR confirms on its sales and use tax forms page that this version remains in use.
You must file ST-9A if your combined annual sales and use tax liability is $100 or less for the calendar year, you are registered as a Massachusetts vendor, and the DOR has placed you on the annual filing schedule. The DOR assigns this schedule when it issues your Form ST-1 sales tax registration certificate, and you cannot switch to annual filing on your own. Vendors that exceed $100 in yearly liability must use the regular Form ST-9 on a monthly or quarterly schedule instead.
Even if you collected zero sales tax during the year, you still must file ST-9A as a zero return. Failing to file a zero return triggers an automatic non-filer notice, a $5 minimum penalty under M.G.L. c. 62C, § 33, and possible suspension of your sales tax registration. The DOR cross-checks annual filers against active registrations, so a missing return is flagged within weeks of the January 30 due date.
The form also serves a second purpose: it is the place where small vendors self-report use tax on items they bought from out-of-state sellers who did not charge Massachusetts tax. The 6.25% use tax rate matches the sales tax rate, and the DOR explains the obligation on its use tax for businesses page.
Before You Start: Documents and Information You Need
Pulling your records together before you log in saves time and prevents the kind of rounding errors that trigger DOR notices. Maria Lopez, a part-time pottery seller in Worcester, learned this the hard way when she filed without her PayPal year-end summary and had to amend her return three weeks later. Spending twenty minutes on the checklist below keeps you from making the same mistake.
Here is the pre-filing checklist every ST-9A filer should complete:
- Massachusetts sales tax registration number (also called your account ID), because the DOR uses it to match your return to your account, and a wrong digit routes your filing into a suspense file
- Federal Employer Identification Number (FEIN) or Social Security Number, since sole proprietors without an EIN file under their SSN, and a mismatch with IRS records delays processing
- Year-end gross sales total from your point-of-sale system, accounting software, or marketplace dashboard, because Line 1 asks for all gross receipts, not just taxable ones
- Year-end taxable sales total, separated from exempt sales like resale, food, or clothing under $175, because Line 2 only counts what was actually subject to the 6.25% rate
- Sales tax collected ledger, since the tax you actually collected from customers must match Line 3, and the DOR will assess the higher of collected or computed tax
- Out-of-state purchase log for items used in Massachusetts where no sales tax was charged, because Line 5 captures use tax and missing it is the most common audit trigger
- Exemption certificates on file (Form ST-4 for resale and Form ST-5 for tax-exempt buyers), because these support the difference between gross sales and taxable sales
- Bank account and routing numbers for ACH debit payment through MassTaxConnect, since electronic payment is required when liability exists and a wrong routing number bounces the payment
- Prior-year ST-9A for reference, because the DOR uses prior filings to flag unusual swings in reported sales
- MassTaxConnect username and password, since paper filing is allowed only in narrow cases and most filers must submit electronically through the MassTaxConnect portal
Each missing item creates a specific delay. No EIN means manual review, no use tax log means an understated return, and no MassTaxConnect login means a last-minute scramble to recover credentials before midnight on January 30.
Where to Get the Form and How to Access It
The official ST-9A is published only by the Massachusetts DOR, and you should never download it from a third-party site because outdated versions still circulate online. The current form lives on the DOR sales and use tax forms list as a fillable PDF titled Form ST-9A Annual Sales and Use Tax Return. The DOR also embeds the form inside MassTaxConnect, so most filers never download the PDF at all.
If you file online, log into MassTaxConnect, choose your sales and use tax account, and select File Return for the annual period that just closed. The portal opens an interactive version of ST-9A that does the math for you, validates your account number, and produces a confirmation number the moment you submit. The DOR’s MassTaxConnect help center explains every screen.
If the DOR has approved you to paper file, print the PDF on white letter-size paper, complete it in black ink or by typing, and mail it to Massachusetts Department of Revenue, PO Box 7027, Boston, MA 02204. Do not fold the form, do not staple the check, and do not send it certified unless you want a return receipt, because the DOR opens regular mail faster than certified mail. Paper filers should keep a photocopy of the signed form and the canceled check as proof.
A common misconception is that ST-9A can be filed by fax or email. It cannot. The DOR accepts only MassTaxConnect submissions and paper mail for this form, and any fax or email attempt is discarded without notice.
Step-by-Step: How to Fill Out Form ST-9A Line by Line
The form is one page, eight numbered lines, plus a header block and a signature block. Work through it in order, because Lines 4 through 8 depend on the totals above them. Carlos Rivera, a Lowell food-truck owner, taught his bookkeeper to always start at the top and never skip ahead, and his returns have cleared first-pass review for six years running.
Header: Federal Identification Number
The header asks for your Federal Identification Number, which is your nine-digit FEIN issued by the IRS or, for sole proprietors without an EIN, your Social Security Number. Enter the number with no dashes, in the boxes provided, left-justified.
For example, Maria Lopez enters 123456789 if her EIN is 12-3456789. If you operate as a sole proprietor and use your SSN, enter all nine digits in the same field, because the DOR’s system accepts both.
A common edge case is a single-member LLC that has its own EIN but is disregarded for federal tax purposes. Use the LLC’s EIN here, not the owner’s SSN, because the sales tax registration is tied to the LLC.
The most common mistake is transposing two digits, which routes the return into a suspense file and delays posting by two to four weeks. A misconception is that the SSN and EIN are interchangeable on later returns, but once you register with one number you must keep using it on every ST-9A you file.
Header: Name of Business and Address
Enter the legal name of the business exactly as it appears on your Massachusetts sales tax registration certificate, followed by the street address, city, state, and ZIP. If you operate under a DBA, list the legal name first and the DBA on the second line.
For example, Carlos Rivera writes Rivera Mobile Foods LLC on the name line and dba Carlos’s Tacos underneath. Then he enters 148 Market Street, Lowell, MA 01852.
If you use a P.O. Box for mail but operate from a physical location, list the physical address here and use the mailing address only on MassTaxConnect’s profile screen, because the form is designed for the location where sales occur.
A common mistake is using a new business name after a rebrand without first updating the DOR registration, which causes the return to mismatch the account record. The misconception is that the DOR auto-updates names from the Secretary of the Commonwealth’s filings; it does not, and you must file Form AI-1 to change the registered name first.
Header: Period Covered
The Period Covered line asks for the calendar year you are reporting. Annual filers always report a full calendar year, January 1 through December 31, regardless of when the business started.
For example, Janet Park, who opened her Cambridge bookstore in July, still writes 01/01/2025 to 12/31/2025 on her first ST-9A, and reports only the sales that actually happened from July onward.
If your business closed mid-year, write the closure date as the end of the period and check the Final Return box, because the DOR will close the registration once it processes the final return.
A common mistake is entering a fiscal year instead of a calendar year, which the DOR rejects automatically because ST-9A is calendar-year only. The misconception is that partial years require a different form; they do not, and you simply report the months you operated.
Line 1: Gross Sales
Line 1 asks for total gross sales for the entire year, including taxable, exempt, and out-of-state sales. Enter the figure rounded to the nearest whole dollar with no commas or dollar signs.
For example, Maria Lopez sold $2,140 in pottery during the year, including $340 shipped to New Hampshire customers, so she enters 2140 on Line 1.
The edge case here is marketplace facilitator sales. If Etsy, eBay, or Amazon collected and remitted Massachusetts sales tax for you, you still include those gross sales on Line 1 but back them out on Line 2 as non-taxable to you.
The most common mistake is reporting only taxable sales on Line 1, which makes the rest of the return look inconsistent and triggers a desk audit. The misconception is that exempt sales do not belong on the return at all; they do, because Line 1 is a true gross figure.
Line 2: Taxable Sales
Line 2 asks for the portion of Line 1 that was actually subject to the 6.25% Massachusetts sales tax. Subtract exempt sales, resale sales backed by a Form ST-4, tax-exempt buyer sales backed by a Form ST-5, out-of-state shipments, and items exempt by statute like clothing under $175 or most groceries.
For example, Maria Lopez removes the $340 in New Hampshire shipments and $200 in resale sales to a gift shop, leaving 1600 on Line 2.
An edge case is mixed transactions, like a sale that includes both taxable pottery and a clothing item under $175. Split the receipt and include only the taxable portion on Line 2, because bundling exempt items into the taxable figure overstates your liability.
The most common mistake is forgetting to subtract internet sales shipped out of state, which inflates Line 2 and makes you overpay. The misconception is that all sales to other states are exempt; they are exempt from Massachusetts sales tax, but you may owe sales tax in the destination state if you have nexus there.
Line 3: Sales Tax (Line 2 × 6.25%)
Line 3 is the sales tax due, calculated by multiplying Line 2 by 0.0625. The DOR’s online system performs this math automatically, but paper filers must compute it by hand.
For example, Maria Lopez multiplies $1,600 × 0.0625 = $100.00 and enters 100 on Line 3.
The edge case is meals tax. If you sell prepared food, you do not report meals tax on ST-9A; meals tax goes on Form ST-MAB-4, and Line 3 here covers only general 6.25% sales tax.
The most common mistake is using last year’s rate or the 5% pre-2009 rate from memory, both of which trigger an automatic adjustment notice. The misconception is that you can report only what you actually collected if you under-collected; the DOR assesses the higher of computed tax or collected tax under M.G.L. c. 64H, § 3.
Line 4: Adjustments
Line 4 captures adjustments for prior overpayments, credits issued by the DOR, or returned-merchandise refunds tied to taxable sales. Enter a positive number for credits you are claiming and attach a brief explanation if filing on paper.
For example, Carlos Rivera received a $15 credit memo from the DOR for an overpayment in the prior year and enters 15 on Line 4.
An edge case is bad-debt adjustments. Massachusetts allows a bad-debt deduction under 830 CMR 64H.1.5, but only if the debt was previously reported as taxable and written off for federal income tax purposes.
The most common mistake is using Line 4 to fix a math error from earlier in the return, which is not its purpose; you must amend the original return instead. The misconception is that any refund to a customer creates an automatic adjustment; only refunds tied to previously remitted tax qualify.
Line 5: Use Tax on Out-of-State Purchases
Line 5 reports use tax on tangible items you bought from out-of-state sellers who did not charge Massachusetts sales tax, where you used the items in Massachusetts. Multiply the total cost of those items by 6.25% and enter the result.
For example, Janet Park bought $800 in display shelving from an out-of-state vendor with no Massachusetts tax charged, computes $800 × 0.0625 = $50.00, and enters 50 on Line 5.
The edge case is items already taxed by another state. You may credit the other state’s sales tax against Massachusetts use tax up to 6.25%, as explained in the DOR’s use tax guide.
The most common mistake is leaving Line 5 blank because the filer assumes use tax applies only to consumers; it absolutely applies to businesses, and the DOR audits this line aggressively. The misconception is that small purchases below some threshold are exempt; there is no de minimis for business use tax in Massachusetts.
Line 6: Total Tax (Line 3 + Line 5 − Line 4)
Line 6 is the total tax due, calculated by adding Line 3 and Line 5, then subtracting Line 4. This is the figure that drives your payment.
For example, Maria Lopez adds $100 + $0 − $0 and enters 100 on Line 6, while Janet Park adds $45 + $50 − $0 and enters 95.
The edge case is a negative result, which can happen if Line 4 adjustments exceed Lines 3 and 5. Enter zero on Line 6 and request a refund or carry-forward through MassTaxConnect, because the form does not accept negative totals.
The most common mistake is forgetting to subtract Line 4, which overstates the tax due and overpays the DOR. The misconception is that Line 6 equals what you owe with the return; it equals total tax, and penalties or interest are added separately on Line 8.
Line 7: Penalties (If Filing Late)
Line 7 is for late-filing and late-payment penalties under M.G.L. c. 62C, § 33. The late-file penalty is 1% per month of unpaid tax up to 25%, and the late-pay penalty is also 1% per month up to 25%, with a $5 minimum.
For example, Carlos Rivera files two months late with $80 due, computes $80 × 1% × 2 = $1.60 for late filing plus $1.60 for late pay, and enters 3.20 rounded to 3 on Line 7.
The edge case is reasonable cause. The DOR may waive penalties under Administrative Procedure 633 if you show a documented hardship like illness or natural disaster.
The most common mistake is leaving Line 7 blank when filing late, which prompts the DOR to assess the penalty itself plus a notice fee. The misconception is that filing on time without payment avoids penalty; the late-pay penalty still applies even if the return was timely.
Line 8: Interest
Line 8 is interest on unpaid tax, calculated at the federal short-term rate plus 4%, compounded daily, as published by the DOR’s interest and penalty guide. The rate changes quarterly, and MassTaxConnect computes it automatically.
For example, Carlos Rivera owes $80 and is sixty days late at an 8% annual rate, so interest is roughly $80 × 8% × 60/365 = $1.05, entered as 1 on Line 8.
The edge case is partial payments, which reduce the principal on which interest accrues from the date of each payment. Track each payment date because interest stops accruing on paid amounts.
The most common mistake is computing interest on the total tax including penalties; interest applies only to unpaid tax, not to penalties. The misconception is that interest can be waived for reasonable cause; under M.G.L. c. 62C, § 32, interest is statutory and cannot be abated.
Signature Block
The signature block requires the signature of the owner, partner, corporate officer, or authorized agent, plus a printed name, title, date, and daytime phone number. Paid preparers complete a separate preparer block below.
For example, Maria Lopez signs Maria Lopez, prints Maria Lopez, lists her title as Owner, dates it 01/15/2026, and enters (508) 555-0142.
The edge case is electronic signatures on MassTaxConnect, which uses your login credentials as your legal signature under 830 CMR 62C.5.1.
The most common mistake is having an unauthorized employee sign for the owner, which renders the return invalid until corrected. The misconception is that a missing signature is a minor defect; an unsigned return is treated as not filed and triggers full late-filing penalties.
Three Filled-Out Examples Using Real Scenarios
These three named filers represent the most common ST-9A profiles. Each table walks through the form from top to bottom so you can match your situation to the closest example.
Scenario 1: Maria Lopez, Etsy Pottery Seller
Maria sells handmade pottery on Etsy and at two craft fairs a year. She had $2,140 in gross sales, of which $1,600 was taxable in Massachusetts.
| Form Section | What Maria Enters |
|---|---|
| Federal ID Number | 123-45-6789 (her SSN, no EIN) |
| Business Name | Maria Lopez Pottery |
| Address | 55 Elm Street, Worcester, MA 01609 |
| Period Covered | 01/01/2025 – 12/31/2025 |
| Line 1 Gross Sales | 2140 |
| Line 2 Taxable Sales | 1600 |
| Line 3 Sales Tax | 100 |
| Line 5 Use Tax | 0 |
| Line 6 Total Tax | 100 |
| Signature | Maria Lopez, Owner, 01/15/2026 |
Scenario 2: Carlos Rivera, Part-Time Consultant With Use Tax
Carlos runs a one-person consulting LLC and sells branded notebooks on the side. He bought office equipment online with no tax charged and owes use tax.
| Form Section | What Carlos Enters |
|---|---|
| Federal ID Number | 98-7654321 |
| Business Name | Rivera Consulting LLC |
| Address | 148 Market Street, Lowell, MA 01852 |
| Period Covered | 01/01/2025 – 12/31/2025 |
| Line 1 Gross Sales | 720 |
| Line 2 Taxable Sales | 720 |
| Line 3 Sales Tax | 45 |
| Line 5 Use Tax | 38 (on $600 of out-of-state equipment) |
| Line 6 Total Tax | 83 |
| Signature | Carlos Rivera, Member, 01/20/2026 |
Scenario 3: Janet Park, Zero-Sales Cambridge Bookstore
Janet’s bookstore had a slow first year and collected no sales tax because almost all books were sold to a tax-exempt school under a Form ST-5. She still must file a zero return.
| Form Section | What Janet Enters |
|---|---|
| Federal ID Number | 45-1122334 |
| Business Name | Park Books LLC |
| Address | 22 Mass Ave, Cambridge, MA 02139 |
| Period Covered | 07/01/2025 – 12/31/2025 |
| Line 1 Gross Sales | 4200 |
| Line 2 Taxable Sales | 0 |
| Line 3 Sales Tax | 0 |
| Line 5 Use Tax | 0 |
| Line 6 Total Tax | 0 |
| Signature | Janet Park, Manager, 01/12/2026 |
How to File the Completed Form
Massachusetts pushes electronic filing for almost every sales and use tax return, and the DOR’s TIR 16-9 sets the e-file threshold low enough that most ST-9A filers must use MassTaxConnect. The exceptions are narrow, and the DOR will tell you in writing if you are approved to paper file.
Online through MassTaxConnect is the default channel. Log into MassTaxConnect, select your sales and use tax account, choose File Return for the annual period, complete the on-screen ST-9A, and submit. Payment is made by ACH debit from a checking account at no cost, or by credit card through the DOR’s payment processor for a 2.35% convenience fee. Processing is immediate, you receive a confirmation number on screen, and the DOR posts the return to your account within one business day. Save the confirmation number and the PDF receipt as your proof of filing.
By mail is allowed only if the DOR has waived the e-file requirement. Print the Form ST-9A PDF, complete it in black ink, sign it, and mail it with a check made payable to Commonwealth of Massachusetts to Massachusetts Department of Revenue, PO Box 7027, Boston, MA 02204. There is no filing fee. Allow four to six weeks for processing, and keep the canceled check and a photocopy of the form as proof of filing.
In person is not a routine option, but the DOR’s Boston walk-in office at 200 Arlington Street, Chelsea, accepts paper returns Monday through Friday during business hours. Bring two copies so the clerk can stamp one for your records.
Fax and email are not accepted for ST-9A. Any return submitted that way is discarded and counted as not filed, which means full late-filing penalties accrue from January 30 forward.
What Happens After You File
Once the DOR receives your ST-9A, the system runs three automated checks: the math, the account match, and the prior-year comparison. If all three pass, the return posts to your account within one business day for online filings and within four to six weeks for paper filings. You can confirm posting on the Account Summary screen of MassTaxConnect.
If a check fails, the DOR sends a Notice of Adjustment by mail explaining what changed. Common adjustments include recalculating Line 3 to match the 6.25% rate, adding use tax the DOR identified through marketplace data, or correcting a transposed account number. You have 30 days to respond by filing an Application for Abatement (Form ABT) if you disagree.
Refunds for overpayments arrive by check or direct deposit within six to eight weeks, depending on whether you elected direct deposit on MassTaxConnect. Underpayments accrue daily interest until paid, and the DOR can issue a levy under M.G.L. c. 62C, § 53 after a final notice if the balance remains unpaid for 60 days.
Annual filers stay on the annual schedule as long as they remain under the $100 liability threshold. If your liability crosses the threshold, the DOR moves you to monthly or quarterly Form ST-9 filing the following year and notifies you in writing.
Mistakes to Avoid When Filling Out the Form
Small mistakes on a one-page form generate outsized headaches, because the DOR’s automated systems flag every inconsistency. Watch for these specific errors:
- Filing ST-9A when your liability exceeds $100. The DOR rejects the return and assesses late penalties on the Form ST-9 you should have filed.
- Skipping a zero return. A missing return triggers a non-filer notice and a $5 minimum penalty under M.G.L. c. 62C, § 33.
- Reporting only taxable sales on Line 1. This understates gross sales and prompts a desk audit when the figure does not reconcile with marketplace data.
- Forgetting Line 5 use tax. The most common audit issue, because the DOR cross-checks out-of-state purchase records.
- Using the wrong calendar period. Fiscal years are not allowed, and the system rejects the return automatically.
- Transposing the FEIN or SSN. Routes the return to a suspense file and delays posting by weeks.
- Computing tax at the wrong rate. The 6.25% rate has been in effect since August 1, 2009, and any other rate triggers an adjustment.
- Bundling meals tax onto Line 3. Meals tax goes on Form ST-MAB-4, and combining the two distorts both returns.
- Missing the signature. An unsigned paper return is treated as not filed, with full late penalties.
- Paying by credit card without budgeting the fee. The 2.35% convenience fee is non-refundable even if the return is later amended to zero.
Each of these mistakes carries a direct cost in penalties, interest, or processing delay, and the cleanest fix is always to slow down and reconcile your numbers before submitting.
Do’s and Don’ts
Do’s:
- Do file by January 30 even if you owe nothing, because the zero return is mandatory under DOR rules
- Do use MassTaxConnect whenever possible, because the math is automatic and the confirmation number is instant proof of filing
- Do reconcile gross sales to your accounting software and marketplace 1099-K before you start, because mismatches drive most desk audits
- Do keep exemption certificates (ST-4 and ST-5) for at least three years, because the DOR can request them during an audit window
- Do report use tax on Line 5 for every out-of-state purchase used in Massachusetts, because audits start with this line
- Do save the confirmation number as a PDF and email it to yourself, because it is the cleanest proof of timely filing
Don’ts:
- Don’t paper file unless the DOR approved a waiver, because unauthorized paper returns process slower and can be rejected
- Don’t round aggressively to a friendly number, because the DOR matches your figures against marketplace and bank data
- Don’t combine meals tax with sales tax on Line 3, because they require separate forms
- Don’t sign for someone else without written authorization on file, because the DOR can void the return
- Don’t forget the period covered, because a blank period field rejects the return at intake
- Don’t pay by credit card for small balances, because the 2.35% fee often exceeds the savings of avoiding a check
Pros and Cons of Filing on Your Own vs. With Help
Pros of filing on your own:
- No preparer fee, because ST-9A is short enough that most owners can complete it in under thirty minutes
- Faster turnaround, because you file the moment your books close instead of waiting in a preparer’s queue
- Better understanding of your numbers, because doing the math yourself reveals patterns you would miss otherwise
- Direct control over corrections, because you can amend on MassTaxConnect within minutes
- Free MassTaxConnect tools, because the portal does the math, validates the account, and stores prior returns
Cons of filing on your own:
- Risk of missing use tax, because Line 5 catches most self-filers off guard
- No second set of eyes, because solo filers miss transpositions and rate errors
- Limited audit support, because a CPA or enrolled agent can represent you if the DOR sends a notice
- No penalty advice, because preparers know which abatements to request under AP 633
- Time cost during a busy season, because January 30 falls during W-2 and 1099 season for most small businesses
ST-9A vs. ST-9 at a Glance
| Feature | What It Means |
|---|---|
| ST-9A filer | Annual liability of $100 or less, files once a year by January 30 |
| ST-9 filer | Annual liability over $100, files monthly or quarterly per DOR assignment |
| ST-9A due date | January 30 of the year following the calendar year reported |
| ST-9 due date | 30 days after the close of each filing period |
| Both forms filed through | MassTaxConnect under the same sales and use tax account |
| Both forms governed by | M.G.L. c. 64H, c. 64I, and c. 62C |
FAQs
Is Form ST-9A the same as Form ST-9?
No. ST-9A is the annual short-form return for vendors with $100 or less in yearly tax liability, while ST-9 is the monthly or quarterly return for higher-volume vendors.
Do I have to file ST-9A if I had no sales?
Yes. Massachusetts requires a zero return from every registered vendor, and skipping it triggers a non-filer notice plus a $5 minimum penalty.
Can I switch to ST-9A on my own?
No. The DOR assigns your filing schedule when it issues your registration, and you cannot switch without DOR approval through MassTaxConnect.
When is ST-9A due?
No later than January 30 of the year following the calendar year reported, with no automatic extension available.
Can I file ST-9A on paper?
No unless the DOR granted a written e-file waiver, because TIR 16-9 requires electronic filing for almost every vendor.
What goes on Line 1 if I sell on Etsy?
Yes include all gross Etsy sales on Line 1, then back out the marketplace-collected portion on Line 2, because the marketplace remits but the gross figure stays on your return.
Do I report use tax on Line 5 if I am a small vendor?
Yes. Use tax applies to every Massachusetts business, and there is no de minimis threshold for out-of-state purchases used in the state.
Should I write the FEIN or SSN in the header if I have both?
Yes use the number you registered with on Form ST-1, because changing it mid-stream causes the DOR’s system to mismatch the return.
What rate do I use on Line 3?
Yes use 6.25%, which has been the Massachusetts sales tax rate since August 1, 2009, with no local add-ons for general sales.
Does Line 6 include penalties and interest?
No. Line 6 is total tax only; penalties go on Line 7 and interest on Line 8, and they are added separately to your payment.
Can I amend ST-9A after filing?
Yes through MassTaxConnect by selecting the original return and choosing Amend, which generates a corrected ST-9A you sign and resubmit.
Do I need to attach exemption certificates to ST-9A?
No. Keep Form ST-4 and Form ST-5 certificates in your records for at least three years, but do not mail them with the return.
What if I closed my business mid-year?
Yes still file ST-9A for the partial year, check the Final Return box, and the DOR will close the registration after processing.
Can the DOR waive late penalties?
Yes under Administrative Procedure 633 if you show reasonable cause like documented illness or natural disaster, but interest cannot be waived.
Related reading
- How to Fill Out Massachusetts Form Schedule C (w/Examples) + FAQs
- How to Fill Out Massachusetts Form ST-12 (w/Examples) + FAQs
- How to Fill Out Massachusetts Form ST-2 (w/Examples) + FAQs
- How to Fill Out Massachusetts Form ST-4 (w/Examples) + FAQs
- How to Fill Out Massachusetts Form ST-5 (w/Examples) + FAQs
- How to Fill Out Massachusetts Form ST-9 (w/Examples) + FAQs