Miami County, Ohio Sales Tax Rate
Buying anywhere in Miami County? The combined sales tax rate is 7.00%. Below is the full breakdown and a calculator already set to Miami County.
- Ohio state base5.75%
- Miami County & transit1.25%
- Total you pay7.00%
Miami County's 7.00% rate sits below the statewide average of 7.14%. Across Ohio, combined rates run from 6.50% to 8.00%, so where you buy genuinely changes the bill. Ohio is unusual here: for most sales by an Ohio seller to an Ohio buyer the rate follows the seller's location, not yours (R.C. 5739.033(B)(1) sources intrastate sales to where the vendor receives the order). Out-of-state sellers and online marketplaces are the exception — they source to your delivery address, so your home county rate is the one that applies there. See all 88 Ohio county rates side by side.
Anywhere in Miami County, a taxable purchase adds 1.25% in county and transit tax on top of Ohio's 5.75% state base — the 7.00% combined rate shown above. 10 of Ohio's 88 counties charge this exact rate. Cars, general merchandise, and prepared restaurant food are all taxed at 7.00%, while unprepared groceries and prescription drugs stay exempt statewide.
Ranked against the rest of the state, Miami County is the 58th-highest of Ohio's 88 counties, tied with 10 others on 7.00%. In hard numbers that matters most on big-ticket buys: a $30,000.00 car costs $2,100.00 in sales tax here. Registering the same car in Butler County (6.50%, Ohio's lowest) would cost $1,950.00 — a $150.00 difference. At the other end, Cuyahoga County (8.00%) would charge $2,400.00. Ohio taxes a vehicle at the rate of the buyer's county of residence, not the dealer's, so the county on your registration is the one that sets the bill.
Miami County is seated at Troy, covers 407 square miles and is home to 112,634 people — the 25th-most-populous of Ohio's 88 counties, at about 277 people per square mile. 14 ZIP codes fall inside it, running from 45308 to 45383, and every one of them pays the same 7.00% — Ohio municipalities cannot levy a sales tax of their own, so there is no city surcharge anywhere in the county.
Calculate tax in Miami County
Miami County sales tax by purchase amount
| Purchase | Sales Tax (7.00%) | Total |
|---|---|---|
| $1.00 | $0.07 | $1.07 |
| $5.00 | $0.35 | $5.35 |
| $10.00 | $0.70 | $10.70 |
| $25.00 | $1.75 | $26.75 |
| $50.00 | $3.50 | $53.50 |
| $100.00 | $7.00 | $107.00 |
| $500.00 | $35.00 | $535.00 |
| $1,000.00 | $70.00 | $1,070.00 |
Groceries and prescription drugs are exempt statewide, so they carry $0 tax in Miami County. Prepared food and general merchandise are taxed at 7.00%.
Miami County sales tax FAQ
The combined sales tax rate in Miami County is 7.00% in 2026. That is Ohio's 5.75% state base plus a 1.25% county and transit portion.
At 7.00%, sales tax on a $100 taxable purchase in Miami County is $7.00, for a total of $107.00.
No. Unprepared groceries and prescription drugs are exempt from Ohio sales tax statewide, so they are not taxed in Miami County. Prepared food is taxable at 7.00%.
14 Ohio ZIP codes have Miami County as their primary county, including 45308, 45312, 45317, 45318, 45326. All of them use the 7.00% combined rate. Because ZIP boundaries can cross county lines, a delivery address near the county line should be checked against Ohio's rate-by-address lookup.
Miami County borders Champaign (7.25%), Clark (7.25%), Darke (7.25%), Shelby (7.25%), Montgomery (7.50%). None of them charge less than Miami's 7.00%.
At 7.00%, Miami County has the 58th-highest combined sales tax rate of Ohio's 88 counties, tied with 10 other counties. Statewide, combined rates run from 6.50% to 8.00%.
Counties bordering Miami County
Miami County shares a line with 5 other Ohio counties. Crossing one of these lines genuinely changes the bill — though which side counts depends on who is selling: an Ohio seller charges its own county's rate on an intrastate sale, while an out-of-state or marketplace seller charges yours.
| County | Combined rate | vs Miami | Tax on $30,000.00 |
|---|---|---|---|
| Champaign County | 7.25% | +0.25% | $2,175.00 |
| Clark County | 7.25% | +0.25% | $2,175.00 |
| Darke County | 7.25% | +0.25% | $2,175.00 |
| Shelby County | 7.25% | +0.25% | $2,175.00 |
| Montgomery County | 7.50% | +0.50% | $2,250.00 |
No county bordering Miami charges less than 7.00%, so there is no cheaper neighbour to cross into.
ZIP codes in Miami County (7.00% sales tax)
14 Ohio ZIP codes have Miami County as its primary county. Every address in them pays the same 7.00% combined rate — 5.75% state plus 1.25% county and transit.
- 45308
- 45312
- 45317
- 45318
- 45326
- 45337
- 45339
- 45356
- 45359
- 45361
- 45371
- 45373
- 45374
- 45383
ZIP codes are a USPS delivery construct and a few straddle county lines, so a border address can fall in a different taxing county than its ZIP suggests. Check any borderline address with the ZIP code sales tax lookup or Ohio's official rate-by-address finder before you file.
Compare Miami County rates
- Butler — 6.50%
- Cuyahoga — 8.00%
- Franklin — 8.00%
- Hamilton — 7.80%
- Lucas — 7.75%
- Montgomery — 7.50%
- Stark — 6.50%
- Summit — 6.75%
- Ottawa — 7.00%
- Portage — 7.00%
- Putnam — 7.00%
- Richland — 7.00%
- Union — 7.00%
- Ashland — 7.00%
- See all 88 counties →
- Browse Ohio rates by city →
Need a different calculation? Try the reverse sales tax calculator, the car sales tax calculator, the discount sales tax calculator, or the use tax calculator.
Shipping somewhere specific? Use the Ohio ZIP code sales tax lookup to confirm the rate for any ZIP code in Miami County.
Not sure what's taxable? Read what is taxable in Ohio, Ohio sales tax exemptions, or how to calculate Ohio sales tax.
Ohio's 7.00% Miami County rate is waived on qualifying items during the Ohio sales tax holiday (August 7–9, 2026) — the state's only no-sales-tax weekend.
Rate source: the 7.00% combined rate for Miami County was verified against the Ohio Department of Taxation's County Rate Table by ZIP Code on . Ohio county rates change on quarterly boundaries; for a legally definitive rate at a specific street address, use the Department's The Finder lookup — our guide to using The Finder walks through it.