Before getting into payment mechanics, it's worth establishing the foundational rule: all income you earn from business activity is taxable. That seems obvious, but it's surprising how many solopreneurs mentally treat small or informal payments as "off the books."

The IRS does not make exceptions based on how you receive payment — whether it's a bank transfer, a check, cash, a PayPal payment, or cryptocurrency. If you receive money for goods or services, it's income. It goes on your tax return. Period.

This matters especially for newer solopreneurs who are still testing their business idea and might be accepting payments through friends, personal Venmo, or informal channels. Even if no one sends you a 1099 form, your legal obligation to report the income doesn't change.

There are several ways to accept payment online, and each comes with its own considerations.

For service-based businesses billing clients directly, ACH bank transfers are often the cleanest option. You send an invoice, your client pays via bank transfer, and the money lands in your business checking account. No processing fees in most cases (or very minimal ones), no third- party involvement, and clean, direct transactions.

The tradeoff: slower than card payments (typically 2–5 business days), and you need your client to have your banking information. For ongoing B2B relationships, this is usually fine.

If you're selling products or services to consumers — or to businesses that prefer to pay by card — you'll need a payment processor. The major players are Stripe, Square, and PayPal. Each charges processing fees (typically around 2.9% + $0.30 per transaction for online card payments) and will issue you a Form 1099-K under certain conditions.

Venmo, Cash App, and Zelle are popular — but there are important distinctions. Zelle is generally not designed for business use, and most banks' terms of service prohibit using personal Zelle for commercial transactions. Venmo for Business and Cash App for Business are legitimate options, though they charge fees for business payments and may have reporting obligations.

Here's the one that trips up the most solopreneurs who move their business online: sales tax.

Most people understand that physical stores collect sales tax. What many don't realize is that the Supreme Court's 2018 ruling in South Dakota v. Wayfair fundamentally changed the rules for online sellers. Under what are now called "economic nexus" laws, your business may be required to collect and remit sales tax in a state even if you have no physical presence there.

Every state has different thresholds — often $100,000 in sales or 200 transactions within the state in a calendar year — but these vary widely, and some states have lower thresholds. Once you cross that threshold in a state, you're generally required to register for a sales tax permit in that state and begin collecting.

The critical nuance: Sales tax applies primarily to tangible goods and certain digital products. Most services — consulting, coaching, freelance writing, design work — are not subject to sales tax in most states. But some states do tax certain services, and the rules for digital products (e- books, software, courses, templates) vary dramatically by state.

If you're selling any physical goods, downloadable products, or online courses, you need to research your nexus obligations. Tools like TaxJar or Avalara can automate this. If you're purely service-based, you're likely in the clear — but it's worth confirming for your specific state and service type.

This is a gray area that's evolved rapidly. Many states have enacted new rules around Software as a Service (SaaS), digital subscriptions, and online memberships. If you're running a membership site, a newsletter paid subscription, or a recurring coaching program, you should verify your state's stance on whether these are taxable.

The safest move: consult a CPA with e-commerce experience for a one-time review of your business model. It's a relatively inexpensive way to get clarity and avoid penalties.

Operating online doesn't exempt you from local licensing requirements. Most U.S. cities and counties require a general business license to operate any business — including a home-based or fully online one. Fees are typically low ($50–$150/year), and the application is usually simple.

Beyond that, some professions require specific state licenses regardless of whether you operate online or in person: financial advisors, insurance agents, attorneys, healthcare providers, and others. If your work falls into a regulated profession, ensure your licensing is current and that your online operations are covered by your existing credentials.

Technically, a verbal agreement is a contract. Practically, it's almost impossible to enforce. If you're accepting payment for services — especially recurring or high-value engagements — you should have a written agreement in place.

This doesn't need to be a 20-page document drafted by a lawyer. A clear service agreement that specifies scope of work, payment terms, delivery timeline, revision policies, and what happens if either party terminates early is sufficient for most solopreneurs. Templates are widely available, and services like HelloSign or DocuSign allow you to get them signed electronically.

The bottom line: if a client disputes a charge or refuses to pay, a signed contract is the difference between a resolution and a headache.

Online payments introduce a risk that cash and check don't: chargebacks. A chargeback occurs when a customer disputes a transaction with their bank and the funds are clawed back from your account — sometimes without much notice or opportunity to respond.

To protect yourself:

Keep records of all transactions, including invoices, delivery confirmations, and client communications Use payment platforms with built-in fraud protection (Stripe and Square both offer this) For larger transactions, consider requiring a deposit upfront Make your refund policy explicit in your contracts and on your website

Accepting payments online opens your business to the world — but it also opens you to a wider set of compliance obligations. The most important ones to stay on top of are income reporting (everything is taxable), sales tax nexus (especially if you sell physical goods or digital products), local licensing, and having proper client agreements in place.

None of these are overwhelming when you address them proactively. They become overwhelming when you ignore them for two years and then try to sort it all out at once.

Your next read: Using Stripe, PayPal, or Square: Tax Reporting You Must Know — a deep dive into 1099- K forms, how each platform reports your earnings, and what you need to do to stay compliant.

Processor specifics live in Stripe, PayPal, or Square tax reporting. International sales add layers — see accepting international payments — and every checkout should link the terms and policies customers agree to.