A Maryland sales tax audit is a review by the Comptroller of Maryland of whether your business correctly collected, reported, and paid sales and use tax. If you receive a notice, note its response date, preserve the records for the periods under review, and contact the auditor using the details on the notice. Do not ignore the request or assume that an extension has been granted.
Maryland uses a single statewide sales and use tax rate rather than local jurisdictions administering their own sales taxes. But the taxability of digital products and certain technology services can be nuanced, making SaaS, electronically delivered goods, and mixed transactions important areas to review. Sales Tax Compliance USA is a people-staffed, done-for-you service that can help organize records, analyze transactions, and prepare a supported response; the outcome depends on the facts and the Comptroller’s determination.
What to do when you receive a Maryland audit notice
Read the notice carefully and identify the tax type, audit period, records requested, auditor contact information, and response date. Confirm that the notice relates to your business and preserve relevant accounting, order, payment, shipping, and tax records. If the request is unclear or the deadline is difficult to meet, contact the auditor promptly and ask what is needed and whether additional time may be considered. Get any agreed extension in writing; a request alone does not change a deadline.
Keep communications factual and consistent. Avoid sending an unreviewed data dump: organize the requested material, explain how your records connect to reported returns, and retain copies of everything submitted. If you find a possible error, quantify it and discuss it with your adviser rather than altering historical records or making unsupported claims.
How a Maryland sales tax audit works
The Comptroller of Maryland examines records to determine whether taxable sales were properly treated, tax was collected and remitted when required, exemptions were supported, and use tax was reported on taxable purchases. The auditor may ask questions, request transaction-level detail, compare records with filed returns, and seek explanations for differences. The review may be conducted through document exchange, meetings, or other arrangements specified by the auditor.
For ecommerce and cross-border sellers, the review can involve sales channels, customer and delivery locations, marketplace transactions, refunds, shipping charges, product classifications, and tax collected by other parties. Maryland’s statewide rate does not remove the need to establish whether a transaction is taxable or exempt. Digital products and certain technology services deserve particular attention: Maryland expressly taxes digital products, while the treatment of SaaS and related services depends on the product, purchaser, use, and applicable exclusions or exemptions.
Records Maryland auditors may request
Keep filed sales and use tax returns, payment confirmations, general ledgers, sales journals, invoices, credit notes, refund records, and transaction-level order data. For online sales, retain records that connect each order to the sales channel, product or service, customer, delivery or use location, gross charge, discounts, shipping, tax charged, and refund or cancellation. Preserve marketplace statements and documentation showing which party collected and remitted tax.
Also retain exemption certificates and other support for exempt sales, purchase invoices, accounts-payable records, and evidence of tax paid to suppliers. For digital products or SaaS, keep contracts, product descriptions, invoices, customer-use information where relevant, and records supporting the tax treatment applied. The precise records requested depend on the audit scope; ask the auditor to clarify any item you cannot identify and explain what substitute documentation is available.
How far back can Maryland review sales tax?
The period an auditor may examine can depend on the circumstances, including whether returns were filed and whether the Comptroller alleges an omission or other issue that affects the applicable limitation period. Do not assume that the audit is limited to a particular number of years based on a general rule or on the age of your business. The notice should identify the periods under review; ask the auditor or a qualified adviser to confirm the applicable period for your facts.
Keep records for every period named in the notice and avoid discarding material while an audit, appeal, or collection matter is open. If the notice requests periods you believe are outside the applicable period, raise that issue promptly and support it with filing and payment records. The exact position depends on your circumstances, so confirm it with the Comptroller of Maryland or have us check it for you.
Audit timelines, response deadlines, and extensions
There is no single audit-completion timeline that applies to every Maryland business. The duration depends on the periods and transaction volume involved, how quickly complete records are available, the complexity of taxability questions, and whether the parties need follow-up. Respond by the date in the notice, track each request and submission, and ask the auditor about the expected next steps if the review is taking longer than anticipated.
Do not confuse an audit document deadline with the deadline to challenge a later assessment. The Comptroller’s appeal information says a taxpayer disputing an assessment may request a redetermination hearing on or before the final date shown on the Notification, generally 60 days after its statement date. Deadlines and procedures can depend on the notice and procedural posture, so read the assessment itself and verify the current requirements with the Comptroller or a tax professional. Request an extension before a deadline and obtain confirmation; never assume it has been approved.
Check sales and use tax for missed liabilities
Reconcile sales by period from your order and accounting records to the returns filed and payments made. Separate taxable, exempt, refunded, and otherwise non-taxable transactions, and check whether the tax treatment matches the actual product, customer, and transaction. Review digital goods, subscriptions, SaaS, and bundled charges carefully because Maryland’s rules can distinguish among digital products, services, and qualifying exclusions.
Also review business purchases for which the seller did not charge Maryland tax. Use tax may be due when taxable property or services are used in Maryland and the required tax was not paid to the seller. Compare purchase invoices and expense records with tax paid, and document any exemption or other basis for not accruing use tax. If you identify a potential liability, get advice on the appropriate correction or disclosure process before submitting figures to the Comptroller.
Assessments, penalties, and interest
If the Comptroller determines that additional tax is due, the business may receive an assessment. Review the calculation period by period and transaction by transaction: check the sales base, taxability decisions, credits for tax already paid, refunds, and any assumptions used where records were incomplete. The Comptroller states that interest is calculated from the date the return was originally due, and late-payment penalties may apply, potentially up to 25 percent of the tax owed. The amount and applicable interest rate depend on the facts and the relevant period; verify the current calculation rather than relying on an old rate.
Ask for an explanation of any amount you cannot reconcile and provide records that support corrections. An assessment is not the same as a final answer to every factual dispute, but deadlines to challenge it are important. If you agree with some items and dispute others, clearly identify each disputed issue and the evidence supporting your position. Payment, appeal, and collection consequences can depend on the procedural route, so confirm the options for your notice before acting.
Challenge an assessment and explore resolution options
Yes, a Maryland sales tax assessment can be challenged. The Comptroller’s appeal information directs taxpayers who dispute an assessment to request a redetermination hearing on or before the final date shown on the Notification, generally 60 days after its statement date. The Comptroller’s online appeal process describes review of whether an appeal is timely and whether the matter can be resolved from submitted documents; a hearing may be scheduled if needed. Follow the instructions on your specific notice and submit a clear explanation with supporting records.
Build the challenge around specific issues, such as an incorrect sales total, a transaction classified as taxable when an exemption applies, tax already paid, or an unsupported estimate. Keep proof of filing and delivery. If the assessment is upheld or the matter proceeds further, additional review routes may be available under Maryland procedure, but the steps and deadlines depend on the notice and case history. A professional can help evaluate whether to seek revision, request a hearing, discuss payment arrangements, or pursue another available remedy.
How done-for-you Maryland audit defense works
Sales Tax Compliance USA provides a staffed service, not software. Our team can help you interpret the notice, build a document checklist, organize sales and purchase records, reconcile returns to transaction data, and identify questions that need a supported answer. We can also help analyze Maryland taxability issues, including digital products and SaaS, and prepare a structured response for your review.
Where an assessment is issued, we can help organize the evidence and explain the issues to raise, while confirming procedural steps and deadlines against the notice and current Comptroller information. You remain involved in decisions and approvals; no provider can promise that an audit will be closed without additional tax or that an appeal will succeed. The right approach depends on your records, transactions, and the Comptroller’s findings.
Examples of Maryland sales and use tax treatment areas to review; the result depends on the transaction and any applicable exclusion or exemption.
| Transaction or record area | Maryland audit review focus |
|---|---|
| Tangible goods sold to customers | Determine whether the sale is taxable, whether an exemption is documented, and whether tax was collected and reported. |
| Electronically delivered digital products | Maryland expressly taxes digital products; verify product classification, transaction details, and any applicable exemption. |
| SaaS and software publishing services | Treatment can depend on whether the transaction is a digital product or taxable service, the purchaser’s use, and applicable exclusions; retain contracts and product-use support. |
| Marketplace orders | Reconcile seller records with marketplace statements and establish which party collected and remitted tax for each transaction. |
| Business purchases without tax charged | Check whether the purchase was taxable and used in Maryland, and whether use tax was accrued or an exemption applies. |
| Refunds, cancellations, and exempt sales | Tie credits and exclusions to transaction records, refund evidence, and valid exemption documentation. |
Frequently asked questions
What happens during a Maryland sales tax audit?
The Comptroller of Maryland reviews records and asks questions to determine whether sales and use tax was correctly treated, reported, and paid. The auditor may compare returns with transaction, sales, purchase, and payment records, then request explanations or additional documents. If the review identifies a deficiency, the Comptroller may issue an assessment.
What records should I keep for a Maryland sales tax audit?
Keep returns and payment confirmations, ledgers, invoices, order-level sales data, refunds, marketplace statements, exemption support, purchase invoices, and records of tax paid to suppliers. Ecommerce sellers should preserve information connecting orders to products, sales channels, customer and delivery locations, charges, tax, and refunds. Retain contracts and product details for digital goods and SaaS because classification may depend on the transaction and use.
How far back can Maryland audit sales tax?
The review period can depend on the filing history and circumstances, so do not assume a fixed lookback period applies to every business. Check the periods listed in the notice and ask the Comptroller or a qualified adviser to confirm the applicable limitation period for your facts. Preserve records for all periods under review.
How long does a Maryland sales tax audit take?
There is no single completion time for every audit. The duration depends on the scope, transaction volume, record quality, complexity, and follow-up needed. Respond promptly, keep a log of requests and submissions, and ask the auditor about expected next steps.
What should I do if the Maryland Comptroller audits my business?
Read the notice, note its response date and requested periods, preserve relevant records, and contact the auditor if anything is unclear or you need to discuss timing. Organize a complete, traceable response and keep copies of everything submitted. Do not assume an extension is approved unless you receive confirmation.
Can I appeal a Maryland sales tax audit assessment?
Yes. The Comptroller’s appeal information says a taxpayer disputing an assessment may request a redetermination hearing on or before the final date shown on the Notification, generally 60 days after its statement date; follow the instructions and verify the deadline on your specific assessment. Explain each disputed item and attach supporting records, and consider professional help if the matter proceeds to a hearing or further review.
What penalties and interest can apply after a sales tax audit?
Interest may be calculated from the original return due date, and late-payment penalties may apply; the Comptroller states that penalties can be up to 25 percent of the tax owed. The actual amount and interest rate depend on the period and circumstances, so check the assessment calculation and current Comptroller guidance.
Can a Maryland sales tax audit include use tax?
Yes. A sales and use tax review can examine taxable business purchases used in Maryland when the seller did not collect the required tax. Review purchase invoices, tax paid to suppliers, and any exemption support, then reconcile potential use tax with your returns.
How we handle this for you
The mechanics in Maryland are manageable on their own; the cost is the time it takes every single filing period, in every state you are registered in. We are a managed service: our team registers you with the Comptroller of Maryland, prepares and files your returns, and keeps you compliant period after period. You get one point of contact and one invoice — you do not get another dashboard to learn.
See our sales tax compliance services, check where you have obligations with the nexus calculator, or talk to us about Maryland.
Official sources
- https://www.marylandcomptroller.gov/content/dam/mdcomp/tax/legal-publications/technical-bulletins/tb-56.pdf
- https://www.marylandcomptroller.gov/content/dam/mdcomp/tax/legal-publications/tips/business/bustip29.pdf
- https://www.marylandcomptroller.gov/content/dam/mdcomp/tax/legal-publications/Sales_and_Use_Tax-List_of_TPP_and_Services.pdf
- https://interactive.marylandtaxes.gov/extranet/compliance/harequest/default.aspx
- https://services.marylandcomptroller.gov/taxes/en/penalty-and-interest-charges?id=kb_article_view&sysparm_article=KB0010027
- https://taxcourt.maryland.gov/Procedures.shtml
Reviewed by Paul le Roux, CA(SA). Sales Tax Compliance USA handles US sales tax registration, filing and remittance for cross-border and domestic ecommerce sellers as a fully managed service.
This page is general information for educational purposes and does not constitute legal or tax advice. Sales tax rules change and depend on your specific facts. Consult a qualified tax professional about your own position.