How Four Payment App Works and What It Costs

What Four Payment App Does

Four is a payment processing platform designed for small businesses and independent contractors who need to accept card payments—either in person using a card reader, online through a checkout link, or through invoices sent to customers. The app handles the transaction, deposits the money into your bank account, and provides records of every payment. You pay a fee per transaction rather than a monthly subscription, which means you only pay when money actually moves.

The platform works on your phone or tablet, so you can process payments from anywhere. Four also offers invoicing tools, so you can send a payment request to a customer and they can pay through a link without you needing to swipe their card in person. This matters if you run a service business, do freelance work, or sell products but don't have a physical storefront.

Key Takeaways

• Four charges a per-transaction fee (typically 2.9% plus a fixed amount per card payment) rather than a monthly fee, so you only pay when you process a sale.
• The app works on any smartphone or tablet and includes a card reader for in-person payments, an online checkout link for remote sales, and an invoicing tool for billing customers.
• Money from card payments deposits into your linked bank account, usually within one to two business days, though timing depends on your bank and the transaction type.
• Four does not require a business license or a brick-and-mortar location, making it accessible to sole proprietors, gig workers, and small operations.
• You are responsible for understanding your own tax obligations and keeping records of all transactions for tax reporting purposes.

How Fees Work and What You Actually Pay

Four's pricing is straightforward: you pay a percentage of each transaction plus a small fixed fee. For card-present payments (when you swipe or tap a card in person using Four's reader), the rate is typically 2.9% plus $0.30 per transaction. For card-not-present payments (online or invoice-based), the rate is usually higher—around 3.5% plus $0.15 per transaction—because the risk to Four is greater when the customer is not physically present.

There is no monthly subscription, no setup fee, and no fee to download or use the app itself. You do not pay anything if you do not process a payment. This structure works well if your sales are unpredictable or seasonal, because your costs scale directly with your revenue. If you process $1,000 in card-present sales in a month, you pay roughly $29 in fees; if you process $5,000, you pay roughly $145.

Some payment apps charge monthly minimums or require you to commit to a certain volume. Four does not. However, the per-transaction rate means that if you process very high volume (thousands of dollars per month), you might find a flat-fee processor cheaper. Compare your expected monthly volume against the fee structure before committing.

How Money Gets Into Your Bank Account

When a customer pays you through Four, the app does not hold the money. Instead, Four deposits it into the bank account you link during setup. The timing depends on the type of transaction and your bank's processing speed. Card-present payments (in-person swipes) typically arrive within one to two business days. Card-not-present payments (online or invoice) may take slightly longer, sometimes two to three business days.

Four does not charge you to receive the deposit—the fee is already built into the transaction rate you pay. However, your bank might charge you a fee if you receive too many deposits in a single day or if your account type does not support frequent transfers. Check with your bank about their deposit limits before you start processing high volume.

You can link only one bank account per Four profile, so make sure it is the account where you want business money to land. If you need to change it later, you can update it in the app settings, but the change may take a day or two to take effect.

Setting Up Four and Processing Your First Payment

To start, download the Four app on your phone or tablet, create an account with your email address, and provide basic information about your business (name, address, phone number). Four will ask for your Social Security Number or Employer Identification Number (EIN) for tax reporting purposes. You will also need to link a bank account where deposits will land.

Once your account is active, you have three ways to accept payment. For in-person sales, order Four's card reader (a small device that plugs into your phone's headphone jack or connects via Bluetooth). For online sales, generate a checkout link that you can share via email, text, or your website—customers click the link and enter their card details. For invoicing, create an invoice in the app, enter the customer's email address, and Four sends them a payment link.

Four does not require you to have a business license, a separate business bank account, or any special registration. However, you are responsible for tracking your income and reporting it on your tax return. Keep records of all transactions—Four provides a transaction history in the app that you can export for your records.

What Four Does Not Do

Four is a payment processor, not a full accounting system. It records transactions but does not automatically categorize them for tax purposes, track expenses, or generate tax reports. You will need to export your transaction data and enter it into your own accounting software or give it to a tax preparer. Many small business owners use apps like Wave or QuickBooks Self-Employed alongside Four to handle the accounting side.

Four also does not provide business loans, lines of credit, or cash advances. Some payment processors offer these services; Four does not. If you need working capital, you will need to look elsewhere. Additionally, Four does not handle refunds automatically—if a customer disputes a charge or you need to refund them, you initiate the refund through the app, and it goes back to their card. The refund process typically takes the same one to two business days as a deposit.

Four is not a merchant account in the traditional sense (where a bank or processor extends you credit). It is a payment app that processes transactions in real time. This means you cannot process a payment that exceeds your bank account balance, and you cannot build a transaction history with Four to later may have access to for a business loan through them.

Security, Disputes, and Chargebacks

Four encrypts card data and does not store full card numbers on your phone, which reduces the risk of theft if your device is lost or stolen. The app uses industry-standard security (PCI compliance), meaning it meets the payment card industry's data protection standards. However, you are still responsible for keeping your phone secure and not sharing your Four login with others.

If a customer disputes a charge or requests a chargeback (asking their bank to reverse the payment), Four will notify you and ask for evidence that the transaction was legitimate. This might include an invoice, a receipt, a message from the customer confirming the purchase, or a tracking number if you shipped something. If you cannot provide proof, the chargeback goes through and the money is returned to the customer. Four may also charge you a chargeback fee (typically $15 to $25) on top of losing the original payment.

To protect yourself, always keep records of what you sold, when, and to whom. If you ship products, use tracked shipping so you can prove delivery. For services, send an invoice or confirmation email before processing payment. These steps reduce disputes and give you evidence if a chargeback does occur.

Comparing Four to Other Payment Apps

Four competes with Square, PayPal, Stripe, and Toast, among others. All of these process card payments and deposit money into your bank account. The main differences are in fee structure, features, and who they target. Square charges similar per-transaction rates but also offers a free point-of-sale system for retail stores. PayPal charges slightly different rates depending on whether you use PayPal.Me or their full merchant account. Stripe is designed more for online businesses and developers. Toast focuses on restaurants.

The best choice depends on your business type and sales volume. If you process mostly in-person payments, Square might offer better tools. If you invoice customers frequently, Four's invoicing feature might be simpler than PayPal's. If you sell online only, Stripe might integrate better with your website. Compare the fee structure against your expected monthly volume, then test the app with a few transactions before committing fully.

Tax Reporting and Record-Keeping

Four sends you a 1099-K form at the end of the year if you process more than a certain threshold in card transactions (the threshold varies by year and state, but is typically $20,000 or higher). This form reports your total card sales to the IRS. You are responsible for reporting this income on your tax return, whether or not you receive a 1099-K. If you underreport income, the IRS can match it against the 1099-K and audit you.

Export your transaction history from Four regularly—at least monthly—and keep it in a folder with your other business records. Include invoices, receipts, and any customer communications. If you have business expenses (supplies, equipment, mileage), track those separately so you can deduct them from your income when you file taxes. Four does not do this for you; you need to use accounting software or work with a tax preparer.

If you are self-employed, you may also owe quarterly estimated taxes. Four does not calculate or remind you of these. Talk to a tax professional about whether you need to make quarterly payments based on your expected income.

Frequently Asked Questions

Can I use Four if I do not have a business license?

Yes. Four does not require a business license, incorporation, or any formal business registration. Sole proprietors and independent contractors can open an account with just a Social Security Number and a bank account. However, you are still responsible for reporting your income to the IRS and paying self-employment taxes.

What happens if a customer's card is declined?

Four will notify you immediately that the payment failed. You can ask the customer to try again with a different card, or they can update their card details in the payment link if they are paying online. There is no fee to you for a declined transaction—you only pay when a payment goes through.

Can I process payments in person and online with the same Four account?

Yes. One Four account lets you use the card reader for in-person payments, send checkout links for online sales, and create invoices for billing customers. All transactions deposit into the same linked bank account.

How long does it take to get paid after a customer pays me?

Most payments arrive within one to two business days. Weekends and bank holidays can add time. If a payment shows as pending in your Four app, check back the next business day. If it has been more than three business days and the payment still has not arrived, contact Four support.

What if I need to refund a customer?

Open the transaction in your Four app and select "Refund." The refund goes back to the customer's card within one to two business days. You do not pay a fee to issue a refund, but you do lose the original transaction fee you paid. For example, if you charged $100 and paid $2.90 in fees, and then refund the $100, you keep the $97.10 but lose the $2.90 fee.