You run a small business in Monroe County and you’re not sure whether sales tax applies to what you sell, how much to collect, or what the actual deadline is to file. Getting this wrong costs money—late filings, underpayment penalties, audit notices—and takes time away from your business. The good news: Monroe County has a straightforward structure, and once you understand how the state and county rates stack together, filing becomes routine. This guide walks you through what applies to your business, how the rate works, and exactly how to file your DR-15 return so you can stay compliant without dependency on an expensive accountant.
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Does this apply to your business in Florida?
If you sell tangible personal property in Monroe County—anything physical your customer can touch and take away—you must collect sales tax. Services are not taxable in Florida unless your service is specifically listed in Florida Department of Revenue statute. The key rule: tangible goods are taxed unless explicitly exempt; services are exempt unless explicitly taxed. If you’re unsure whether your specific offering counts, the Florida Department of Revenue website has a service type lookup to confirm.
How the rate works
Florida sales tax is built in layers. The state charges a flat 6% on all taxable sales. On top of that, Monroe County adds its own surtax—a local tax that varies by county and sometimes by city. The combined rate you charge your customer equals the 6% state rate plus the Monroe County surtax rate. Because county and local surtaxes can change and vary even within a county, the safest way to find your exact combined rate is to use the Florida Department of Revenue rate lookup tool or calculator on their website. Enter your address in Monroe County, and it will show you the exact combined percentage you owe.
The reason you shouldn’t rely on memory or an old spreadsheet is that surtax rates do shift. Once a year, verify your rate on the state website and make a note of it. This takes five minutes and prevents costly mistakes on your next return.
How to file step by step
You file your sales tax return using form DR-15 on the Florida Department of Revenue website. Here’s the process:
Step 1: Gather your sales data. Before you log in, have ready the total taxable sales for your filing period (usually a calendar month) and the total tax you collected. If you use a point-of-sale system or accounting software, you can pull a sales report. If you track it manually, add up all invoices or receipts from the period.
Step 2: Log in to the FDOR online portal. You’ll need your sales tax account number (issued when you registered your business). If you’ve lost it, contact the Florida Department of Revenue directly.
Step 3: Select your filing period. The system will show open periods. Choose the month or quarter for which you’re filing. The deadline is the 20th of the month following the end of your period. For example, January sales are due by February 20th. This step-by-step walkthrough of the state filing process shows you exactly which screens you’ll see and where to enter your data.
Step 4: Enter sales and tax figures. The form asks for gross sales, exempt sales, taxable sales, and tax due. The key is accuracy: your total sales minus any legitimate exemptions should equal your taxable sales figure. Multiply taxable sales by your combined rate (state 6% plus Monroe County surtax) to calculate tax due. The system may pre-fill some fields based on your account; verify them before submitting.
Step 5: Review and submit. Before you hit submit, double-check that every number is correct. Once submitted, you’ll receive a confirmation. Keep that confirmation for your records. If you owe tax, you also need to pay it—the system will show payment options (online debit, credit card, or mail).
Step 6: Make note of your due date for next period. Mark the 20th of the next month on your calendar now, so you don’t miss a deadline and trigger a late-filing notice.
Common mistakes
Forgetting to exclude exempt sales. Many small-business owners report all gross sales as taxable, even though certain sales (like resale sales to another business, or specific items) may be exempt. Check with the Florida Department of Revenue or your CPA about what counts as exempt in your line of work. Reporting too much taxable sales means you calculate and pay more tax than required. If you catch it before filing, correct your return. If you file high and then realize the mistake, you can file an amended return (Form DR-15X) to adjust.
Missing the 20th deadline. The state charges a penalty for late filing, and your account may be flagged for audit. If you’re going to miss the deadline, file late rather than not at all, and pay what you owe as soon as you can. Then contact the Florida Department of Revenue to ask about penalty relief—in some cases, first-time errors qualify for waiver or reduction, especially if you file shortly after the deadline.
Using an outdated combined rate. Surtaxes in Florida counties and cities can shift. If you use an old rate, you either underpay (creating a debt) or overpay (creating a credit you have to recover). Every six months, log into the rate lookup tool and verify your combined rate is current. A 30-second check prevents headaches.
Mixing up what you owe with what your customer paid. You collect sales tax from your customer, but that money is held in trust for the state and county until you file and pay. Don’t spend it as ordinary business income. Set it aside in a separate account if possible, or account for it on your books as a payable. When you file, the amount you owe matches what you collected (unless you have exempt sales, in which case owed tax is lower). If you collected $500 in tax but only owe $450, that $50 difference is a credit the state owes back to you, which you can claim on your next return or request as a refund.
Frequently Asked Questions
What is the combined sales tax rate in Monroe County?
Florida charges a 6% state sales tax, and Monroe County adds a surtax on top of that. The combined rate varies depending on your exact location in the county and sometimes by city, so it’s essential to check the Florida Department of Revenue rate calculator with your specific business address to confirm. Don’t rely on a rate from a neighbor or an old document.
Do I have to file DR-15 if I have no sales in a month?
In many cases, yes—you may still need to file a return showing zero sales to keep your account active and avoid penalties. Check your sales tax certificate or contact the Florida Department of Revenue to confirm the filing requirement for your account. Filing a zero-sales return only takes a few minutes and protects you.
What counts as taxable versus exempt in Florida?
Generally, tangible personal property (goods) is taxable unless specifically exempt, and services are exempt unless specifically taxed. Examples of common exemptions include resale certificates (if you buy goods to resell), manufacturing equipment, and certain medical supplies. The rules are detailed, so if you’re unsure about a specific product or service, contact the Florida Department of Revenue or consult your CPA before filing.
What happens if I miss the 20th deadline?
File as soon as you realize the miss. Late filing incurs a penalty, and the Florida Department of Revenue may send you a notice. Pay the tax you owe plus the penalty. Some businesses qualify for penalty relief on a first or isolated late filing; contact the state to ask, but don’t delay payment while waiting for approval.
Can I file DR-15 myself or do I need a CPA?
You can file it yourself if you organize your sales data accurately and understand your filing deadline and combined rate. The form is straightforward once you have the numbers. Many small-business owners file on their own and use an affordable membership platform like Outsourcing Processing to organize transaction data and auto-calculate tax to reduce errors. However, if your situation is complex (multiple locations, multiple states, or significant exempt-sale categories), a CPA’s review is worth the cost.
This article is for general educational purposes and isn’t a substitute for advice from a licensed CPA or tax attorney. Rules vary by jurisdiction and change over time — always confirm current requirements with the Florida Department of Revenue or your advisor.
Staying on top of your Monroe County sales tax starts with one habit: file on time every month. Set a calendar reminder for the 20th, gather your sales figures a few days early, and spend 15 minutes on the DR-15 form. You don’t need to be an expert or fear an audit—you need a system. Once you verify your combined rate and understand the basic structure (state rate plus county surtax), the filing becomes routine. That’s the foundation of staying compliant without surprise penalties or dependency on expensive outsourcing. Your business, your control, your timeline.
This article is for general educational purposes and isn’t a substitute for advice from a licensed CPA or tax attorney. Rules vary by jurisdiction and change over time — always confirm current requirements with the Florida Department of Revenue or your advisor.
See how this fits into the bigger picture in our Florida sales tax guide, which covers county rates and filing deadlines in detail.