The Westminster, Colorado sales tax is 4.25% at the city level as of January 1, 2026. Add the state, regional, and county layers and a shopper pays a total of 8.75% in the Jefferson County portion of the city or 9.00% in the Adams County portion.1City of Westminster. Sales and Use Tax Information Westminster is a home-rule city, which means it writes its own tax code, decides what is taxable, and collects the city’s share directly instead of routing it through the Colorado Department of Revenue.2City of Westminster. Home Rule Cities
What You Actually Pay at the Register in 2026
The total rate on a Westminster purchase is built from five pieces. The county piece changes depending on which side of the city line the sale happens on, so two stores a mile apart can ring up different totals on the same item.1City of Westminster. Sales and Use Tax Information
- City of Westminster: 4.25%
- State of Colorado: 2.90%
- Regional Transportation District (RTD): 1.00%
- Scientific and Cultural Facilities District: 0.10%
- Adams County: 0.75%, for a combined 9.00%
- Jefferson County: 0.50%, for a combined 8.75%
The state, RTD, and cultural district portions go to the Colorado Department of Revenue. The 4.25% city portion is paid directly to Westminster’s Sales Tax Division.3City of Westminster. Westminster Taxes The city rate rose from 3.85% to 4.25% on January 1, 2026, after voters approved ballot measure 3H in November 2025.4Westminster Economic Development. 2026 Changes to Sales and Use Tax
What Westminster Taxes That Colorado Doesn’t
Westminster’s code assumes everything is taxable unless the municipal code specifically exempts it. Several categories catch both residents and new business owners off guard because they are handled differently at the state level.1City of Westminster. Sales and Use Tax Information
Groceries are the biggest one. Food for home consumption is fully taxable in Westminster at the same 4.25% as any other purchase; there is no reduced rate and no exemption, even though the state exempts groceries.5City of Westminster. Tax Compliance Guide – Food Digital goods, downloads, streaming content, and pre-written software are taxable regardless of how they are delivered. Telecommunications, cable, natural gas, and electric service, including residential utilities, carry the city tax. Single-use medical supplies like bandages and disposable products are taxable in Westminster even where state rules exempt them.
If a point-of-sale system has been configured around Colorado state exemption rules, it will undercharge Westminster tax on groceries and medical supplies. Westminster tax settings have to be configured separately.
What’s Exempt
The exemption list is narrower than at the state level. Prescription drugs bearing the federal “Rx Only” designation are exempt from the city sales tax. Sales to governmental entities and qualifying charitable organizations are exempt when the buyer provides a valid exemption certificate. Goods purchased for resale are not taxed when the buyer holds a valid sales tax license and provides a resale certificate at the time of sale.
Use Tax Businesses Often Miss
Use tax is the counterpart to sales tax. If you buy something from an out-of-state vendor, an online seller, or a lower-tax jurisdiction, and you use the item within Westminster, you owe use tax on the difference.6City of Westminster. Use Tax The common triggers:
- Office equipment, computers, or supplies bought online from a vendor that doesn’t collect Westminster tax.
- Inventory a retailer pulls off the shelf for internal use, giveaways, or complimentary items instead of resale.
- Construction materials bought by contractors for use in lump-sum jobs inside the city.
Service businesses that don’t sell any tangible product often assume they have no city tax exposure at all. Westminster’s own guidance says the opposite: service businesses are likely to owe use tax because they consume taxable supplies while doing business.6City of Westminster. Use Tax When a business is first established, purchased, or relocated into Westminster, an Initial Use Tax Return covering startup assets is also required.
Getting a Sales Tax License
Every business operating in Westminster has to hold a city sales and use tax license before making any taxable sales. The license is free; there is no application fee and no renewal fee.7City of Westminster. Business Licenses Commercial business licenses renew annually through the city’s online portal. Home occupation licenses and out-of-city business licenses do not expire.8City of Westminster. Frequently Asked Questions – Business and Sales Tax Licenses Westminster emails a reminder 60 days before a license expires and no longer mails paper renewal forms. Operating with a lapsed license means collecting tax without authorization, which creates problems beyond a simple late fee.
Filing and Paying the City
Returns and payments are due by the 20th of the month following the reporting period, filed through Westminster’s own online tax portal.9City of Westminster. Instructions for Sales and Use Tax Return Filing frequency follows Colorado’s framework: businesses collecting $600 or more per month file monthly, those under $600 may file quarterly, and those collecting $15 or less per month may file annually. Westminster can set its own thresholds, so confirm with the city’s Sales Tax Division before switching to a less frequent schedule.
The return starts with gross sales for the period, including retail, wholesale, consignment, service revenue, and lease or rental receipts. From that total you subtract allowable deductions such as sales to exempt organizations, goods shipped outside the city or state, non-taxable service revenue, and wholesale sales covered by resale certificates. The remainder is your net taxable sales; multiply by 4.25% for city tax owed.1City of Westminster. Sales and Use Tax Information Any use tax owed for the period is reported on the same return. Keep documentation for every deduction; Westminster expects records retained for a minimum of three years.
A return is required even when nothing is owed. A period with no taxable sales still needs a zero-liability return filed by the deadline, and skipping it is treated like a late filing.9City of Westminster. Instructions for Sales and Use Tax Return
What Happens If You File Late
Missing the 20th triggers two charges that run together. The penalty is 10% of the tax due or $15, whichever is greater. Interest runs at 1% per month on the unpaid balance, calculated in whole-month increments, so being one day into a new month counts as a full month of interest.10City of Westminster. Consumer Use Tax Return A $2,000 bill filed two months late turns into $2,240 after a $200 penalty and $40 in interest. Paper returns have to be postmarked by the 20th to count as on time.
Remote Sellers Shipping Into Westminster
Colorado’s statewide economic nexus threshold requires remote sellers with more than $100,000 in annual taxable sales in the state to collect and remit sales tax. Because Westminster is home-rule and collects its own tax, remote sellers may also need to register with the city directly and collect the 4.25% city rate on top of state and special district taxes. Marketplace facilitators like Amazon or Etsy generally handle collection for their third-party sellers, but a seller shipping to Westminster customers from its own website is responsible for registering, collecting, and filing on its own once the threshold is crossed. The city’s Sales Tax Division can confirm whether a specific sales volume triggers a local filing obligation.