About CT E-commerce Tax
Plain-English guides and tax planning for Connecticut online sellers and e-commerce brands, published by Summer Associates in Stamford.
Who publishes this site
CT E-commerce Tax is an educational resource published by Summer Associates Tax Services, a tax and advisory firm in Stamford, Connecticut, serving clients for over 35 years. Our practitioners are enrolled agents, enrolled to practice before the Internal Revenue Service. We built it because online sellers and e-commerce brands face a specific set of tax questions that general-purpose tax sites rarely answer in depth. When a reader needs help applying a strategy, we invite them to contact Summer Associates.
Editorial standards
- Each guide lists the sources it relies on, with links to IRS guidance, the statute, or other published references.
- Content reflects federal and Connecticut law as of 2026-11-15.
- We explain risks and disqualifying facts as plainly as the benefits. If a strategy only works for a narrow set of taxpayers, we say so.
- Content is general education, not individualized advice. Reading it does not create a client relationship.
Read our full editorial policy.
What Summer Associates does for online sellers and e-commerce brands
- Sales tax nexus studies that show where you need to register, plus state registrations
- Marketplace and Shopify bookkeeping, with inventory accounting that supports your cost of goods sold
- 1099-K reconciliation that bridges gross payments to actual profit, and return preparation
- S corp elections, payroll, and Solo 401(k) setup, modeled together with your QBI deduction
- Voluntary disclosure agreements for past-due sales tax
Contact Summer Associates
Our office is in Stamford, convenient to clients throughout Fairfield County, including Greenwich, Darien, New Canaan, Norwalk, Westport, and Fairfield.
Summer Associates Tax Services
48 Union St, #1C, Stamford, CT 06906
(203) 327-4311 · [email protected]
Other sites from Summer Associates
- CT Landlord Tax · Real estate investor tax
- CT Contractor Tax · Contractor & trades tax
- CT W-2 Tax · W-2 employee tax
- CT Retirement Tax · Retiree & estate tax
- CT Practice Tax · Professional practice tax
- CT Restaurant Tax · Restaurant & hospitality tax
- CT Startup Tax · Startup founder tax