What is the sales tax rate in Johnston, Iowa?

The combined sales tax rate in Johnston, Iowa is 7.000% as of 2026. This includes the Iowa state rate of 6.000% plus local jurisdiction taxes.

How is the Johnston sales tax calculated?

Multiply your purchase amount by 7.000% (or 0.00700) to get the tax owed. For example, a $100 purchase incurs $7.00 in sales tax.

What is the Iowa state sales tax rate?

The base Iowa state sales tax rate is 6.000%. Local jurisdictions may add additional taxes on top of this rate.

Does Johnston have a county sales tax?

Johnston imposes an additional county-level sales tax of 1.000% on top of the state rate.

When was the Johnston sales tax rate last updated?

The Johnston sales tax rate was last verified on March 27, 2026. We cross-reference all rates against the official State Department of Revenue data.

Live Data: April 2026

Johnston, IA Sales Tax Rate 2026

The combined sales tax rate in Johnston, Iowa is 7.000%.

Combined Rate 7.000%

State6.000% County1.000%

Johnston Sales Tax Breakdown

Jurisdiction	Rate
Iowa State Sales Tax	6.000%
County Sales Tax	1.000%
Total Combined Rate	7.000%

Which County Is Johnston In?

Johnston falls within Polk, Iowa. Polk imposes a 0.900% county-level sales tax in addition to the Iowa state base rate.

Johnston ZIP Codes

The following ZIP codes are mapped to Johnston for sales tax purposes. All listed codes apply the 7.000% combined rate.

50131

Nearby Tax Rates

Combined Rate

Combined Rate

Business Nexus in Iowa

Economic Nexus Threshold

Selling into Iowa from out of state? Once you exceed $100,000 in annual sales or 200 transactions, you must register and collect Iowa sales tax.

FAQ: Johnston Sales Tax

The combined sales tax rate in Johnston, Iowa is 7.000% as of 2026.

Multiply your purchase price by 7.000% to find the tax owed. A $500 purchase would include $35.00 in sales tax.

Groceries are generally taxable in Iowa. Check the official Department of Revenue for specific exemptions.

Vehicle purchases in Johnston are subject to the 7.000% combined rate, though some states apply different rules for vehicle sales. Verify with the Iowa Department of Revenue or DMV.

Register for a sales tax permit through the official Iowa Department of Revenue website. Registration is typically free and required before collecting any sales tax.

Sales Tax Calculator

Using 7.000% rate for Johnston, IA

Purchase Amount ($)

Tax Amount $0.00

Total with Tax $100.00

Rate applied: 7.000% combined

Official Tax Authority

Iowa Department of Revenue

Filing Deadline: Monthly returns due the last day of the following month. File via GovConnectIowa.

Visit Official Portal (515) 281-3114