Maryland requires self-employed individuals, S-Corp owners, and anyone with significant non-wage income to make quarterly estimated tax payments to the Comptroller — separate from the IRS. Missing them costs you money in penalties and interest every single year.
Most business owners know they need to make federal estimated tax payments to the IRS four times a year. What surprises many of them — especially those who recently went from W-2 employment to self-employment — is that Maryland requires its own separate estimated payments on the same schedule, paid to a completely different agency.
The IRS and the Maryland Comptroller do not share payment systems. Paying your federal estimates on time does not satisfy Maryland. If you're only making federal payments, you're accumulating a Maryland underpayment penalty every quarter without realizing it. For a full overview of Maryland's business tax obligations, see our Maryland Tax Guide.
You are required to make Maryland estimated tax payments if you expect to owe $500 or more in Maryland income tax after withholding and credits for the year. This applies to:
If you receive a W-2 from an employer who withholds Maryland income tax, you may not need to make separate estimated payments — as long as your withholding covers your full Maryland tax liability. But anyone with self-employment income or significant non-wage income almost always needs to pay estimates.
Maryland follows the same quarterly schedule as the IRS. The four payment due dates are:
| Quarter | Income Period | Due Date |
|---|---|---|
| Q1 | January 1 – March 31 | April 15 |
| Q2 | April 1 – May 31 | June 15 |
| Q3 | June 1 – August 31 | September 15 |
| Q4 | September 1 – December 31 | January 15 of the following year |
If a due date falls on a weekend or Maryland state holiday, the deadline moves to the next business day. The Q4 payment due January 15 is a common one to miss — it falls in the new year and many taxpayers forget it relates to the prior year's income.
IRS and Maryland are separate systems. IRS Direct Pay and the Maryland Comptroller's payment portal are entirely different systems with different login credentials, different account numbers, and different confirmation processes. A payment made to one does not satisfy the other. Always confirm you have paid both separately.
There are two safe harbor methods for avoiding Maryland underpayment penalties:
Pay Maryland estimated taxes equal to 110% of your total Maryland tax liability from the prior year, divided into four equal payments. This is the simplest approach and protects you from penalties regardless of how much you earn in the current year. If your prior year Maryland tax was $8,000, you pay $2,200 per quarter ($8,800 total).
Estimate your current year Maryland income and pay 90% of the resulting tax liability across four quarters. This method requires more calculation but can result in lower payments if your income drops significantly year over year. The risk is that if you underestimate, you'll owe penalties.
For most of our clients, we use Method 1 as the baseline and adjust mid-year if income changes significantly. The goal is to avoid penalties while not overpaying the state interest-free all year.
Maryland charges interest on underpaid estimated taxes at the rate set annually by the Comptroller — typically in the 10–12% annualized range in recent years. The penalty applies to each quarter independently, so a missed Q1 payment accumulates interest from April 15 through the filing date even if you make all subsequent payments on time.
Maryland estimated payments can be made online, by mail, or through your tax preparer. The online method is fastest and provides immediate confirmation:
Go to the Maryland Comptroller's online payment portal at interactive.marylandtaxes.gov. You can pay directly from a bank account with no fee. You will need your Social Security number or FEIN, the tax year, and the payment period. Save your confirmation number after each payment.
If you prefer to pay by check, use Maryland Form PV (Personal Declaration of Estimated Income Tax) and mail it with your payment to the Comptroller of Maryland. Make the check payable to "Comptroller of Maryland" and write your Social Security number and tax year on the memo line. Mail well before the deadline — postmark dates matter but processing delays can create confusion.
We calculate Maryland estimated payments for all clients with self-employment or pass-through income and provide payment vouchers or process payments directly. If you're unsure what you owe each quarter, this is the simplest approach. Our tax planning team coordinates both federal and Maryland estimates as part of every engagement.
S-Corp owners have a particularly important dynamic to understand. As an S-Corp owner-employee, you pay yourself a W-2 salary — and Maryland income tax is withheld from that salary just like any other employee. But your S-Corp distributions (the profit above your salary) are not subject to withholding.
That means if your S-Corp generates $200,000 in profit and you pay yourself an $80,000 salary, Maryland income tax is only withheld on the $80,000. The remaining $120,000 in distributions flows to your personal return with no withholding — and you need to make estimated payments on that amount each quarter.
This is one of the most common underpayment situations we see for S-Corp owners, and it's compounded by the fact that distributions often come irregularly throughout the year. If you're considering an S-Corp election or recently made one, see our S-Corp vs. LLC guide and make sure your estimated payment plan accounts for Maryland.
Frederick County residents face a combined state and local income tax burden that makes estimated payments particularly impactful. Maryland's top state income tax rate is 5.75%, and Frederick County adds a tiered local income tax with a top rate of 3.2% — a combined top marginal rate near 8.95%. For a self-employed business owner with $150,000 in net profit, the combined Maryland and local income tax can easily exceed $10,000 — every dollar of which must be paid through withholding or estimated payments.
Getting the quarterly amounts right — not too little, not too much — saves real money. Overpaying the state all year is an interest-free loan to Maryland. Underpaying costs you penalties. We calibrate this for every client as part of our Maryland tax compliance process.
Missing a Maryland estimated payment does not trigger immediate collection action — but it does trigger an underpayment penalty that is automatically calculated when you file your Maryland return. The penalty is assessed quarter by quarter, so missing Q1 costs more than missing Q4 because the interest runs longer.
The penalty is calculated as part of your Maryland return on Form 502UP and is added to any balance due at filing. Waivers are rare and limited to specific statutory exceptions — for everyone else, it is a mechanical calculation, and the only way to avoid it is to have paid enough in withholding and estimated payments throughout the year.
We calculate federal and Maryland estimated payments for every client with self-employment or pass-through income. No more guessing — and no more penalties. Call (301) 662-6992.
Book a Free ConsultationYou start making estimated payments for the quarter in which you first had significant self-employment income. If you left your W-2 job in April, you would begin with the Q2 payment due June 15. You do not need to go back and make a Q1 payment for January through March if you were a W-2 employee during that period.
No — if you pay online through the Comptroller's portal, the payment is linked to your account without a separate form. If you pay by mail, you use Form PV as the payment voucher. Either way, no separate estimated tax return is required — the estimates are reconciled on your annual Maryland income tax return.
Yes. Maryland allows you to use the annualized income installment method, which lets you base each quarter's payment on the actual income earned in that period rather than a flat annual estimate divided by four. This is useful for seasonal businesses or anyone with highly variable income. It requires additional calculations on Form 502UP but can significantly reduce penalties if your income is front- or back-loaded.
The overpayment is applied as a credit on your Maryland annual return. You can choose to receive a refund or apply it to the following year's estimated payments. Maryland does not pay interest on overpayments, so there is no benefit to overpaying — which is why we aim to get the estimates as close to exact as possible.
By Roy Cogliandolo, CPA · Mercer Flanagan · January 13, 2026
This article is general information, not tax or legal advice. Rates, thresholds, and safe harbor rules change — verify current-year requirements with the Comptroller of Maryland or your CPA.