# ATM Definition: What an Automated Teller Machine Is and How It Works Published: 2026-04-01 Author: Warren Team URL: https://www.heywarren.com/blog/atms-definition --- An **ATM (Automated Teller Machine)** is a self-service electronic banking terminal that allows customers to perform basic financial transactions without the need for a human bank teller. Most ATMs allow you to withdraw cash, check account balances, and transfer funds between accounts, all 24 hours a day, 7 days a week. There are approximately **3 million ATMs** in operation globally, with roughly 470,000 in the United States alone. Understanding how ATMs work, what fees they charge, and how the ATM network is structured matters for anyone managing personal finances, choosing a bank, or traveling internationally. ## What Can You Do at an ATM? Modern ATMs do more than dispense cash: | Transaction Type | Available at Most ATMs | |---|---| | Cash withdrawal | Yes, core function | | Balance inquiry | Yes | | Account-to-account transfer | Yes (same bank) | | Cash or check deposit | At bank-owned ATMs; not at third-party ATMs | | PIN change | At bank-owned ATMs | | Bill payment | At some machines | | Mini-statement (last 10 transactions) | At most machines | | Foreign currency dispensing | At airport ATMs and international machines | ## How ATMs Work: The Technical Process When you insert your [debit card](/blog/definition-for-debit-card) and enter your PIN at an ATM, the following happens in seconds: ![Six steps from card insertion to cash dispensing, routed through interbank networks in seconds.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201090%20125%22%20width%3D%221090%22%20height%3D%22125%22%20role%3D%22img%22%3E%3Ctitle%3EFlow%20diagram%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Crect%20x%3D%2230%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22115%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ECard%20Read%3C%2Ftext%3E%3Ctext%20x%3D%22115%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3EChip%20or%20stripe%3C%2Ftext%3E%3Cline%20x1%3D%22205%22%20y1%3D%2262.5%22%20x2%3D%22237%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22244%2C62.5%20235%2C57.5%20235%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22245%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22330%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ENetwork%20Route%3C%2Ftext%3E%3Ctext%20x%3D%22330%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3EVisa%2C%20STAR%2C%20etc.%3C%2Ftext%3E%3Cline%20x1%3D%22420%22%20y1%3D%2262.5%22%20x2%3D%22452%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22459%2C62.5%20450%2C57.5%20450%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22460%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22545%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EPIN%20Auth%3C%2Ftext%3E%3Ctext%20x%3D%22545%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3EEncrypted%20verify%3C%2Ftext%3E%3Cline%20x1%3D%22635%22%20y1%3D%2262.5%22%20x2%3D%22667%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22674%2C62.5%20665%2C57.5%20665%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22675%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22760%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EBank%20Approval%3C%2Ftext%3E%3Ctext%20x%3D%22760%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3EBalance%20check%3C%2Ftext%3E%3Cline%20x1%3D%22850%22%20y1%3D%2262.5%22%20x2%3D%22882%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22889%2C62.5%20880%2C57.5%20880%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22890%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22975%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ECash%20Dispensed%3C%2Ftext%3E%3Ctext%20x%3D%22975%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3ESettlement%20posts%3C%2Ftext%3E%3C%2Fsvg%3E) *Six steps from card insertion to cash dispensing, routed through interbank networks in seconds.* 1. **Card reading**: The ATM reads your card's magnetic stripe or EMV chip, capturing your card number and bank identification number (BIN) 2. **Network routing**: The ATM connects to an interbank network (Visa, Mastercard, NYCE, STAR, Cirrus, Plus) to route your transaction to your bank's processor 3. **Authentication**: Your PIN is encrypted and verified against your bank's records, the PIN itself is never transmitted in plain text 4. **Authorization**: Your bank approves or denies the transaction based on your balance, daily withdrawal limits, and fraud screening 5. **Dispensing**: Cash is dispensed from cassettes holding pre-counted bills (typically $20 denominations in the US) 6. **Settlement**: The transaction posts to your account, usually within seconds for debit cards ## ATM Fee Structure Fees are a significant aspect of ATM economics: **Surcharge fee**: Charged by the ATM owner (the bank or independent operator) to non-customers. Common: $2–$5 at bank ATMs; up to $5–$10 at independent ATMs (casinos, convenience stores) **Foreign ATM fee**: Charged by your own bank when you use an out-of-network ATM. Common: $2–$3 per transaction **International transaction fee**: When using your card abroad, your bank may charge 1–3% of the transaction value for currency conversion **Total out-of-network cost**: Using an ATM abroad with a bank that charges all three fees? You might pay $8–$12+ just to withdraw cash. **How to minimize ATM fees**: - Use your bank's own ATM network - Open an account at banks that reimburse ATM fees (Charles Schwab's checking account, for example, reimburses all ATM fees globally) - Use in-network ATMs found via your bank's app - Get cash back at grocery stores (usually free) ## ATM Ownership: Banks vs. Independent Operators Not all ATMs are owned by banks: ![Three ownership models determine ATM fees, services, and who maintains the machine.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20600%20211%22%20width%3D%22600%22%20height%3D%22211%22%20role%3D%22img%22%3E%3Ctitle%3EHierarchy%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Crect%20x%3D%22220%22%20y%3D%2220%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22%232563eb%22%2F%3E%3Ctext%20x%3D%22300%22%20y%3D%2254%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22white%22%3EATM%20Owners%3C%2Ftext%3E%3Cpath%20d%3D%22M%20300%2078%20L%20300%20105.5%20L%20120%20105.5%20L%20120%20133%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%20fill%3D%22none%22%2F%3E%3Crect%20x%3D%2240%22%20y%3D%22133%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22white%22%20stroke%3D%22%230891b2%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22120%22%20y%3D%22158%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EBank-Owned%3C%2Ftext%3E%3Ctext%20x%3D%22120%22%20y%3D%22176%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3EFree%20for%20customers%3C%2Ftext%3E%3Cpath%20d%3D%22M%20300%2078%20L%20300%20105.5%20L%20300%20105.5%20L%20300%20133%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%20fill%3D%22none%22%2F%3E%3Crect%20x%3D%22220%22%20y%3D%22133%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22white%22%20stroke%3D%22%230891b2%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22300%22%20y%3D%22158%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EIndep.%20Deployers%3C%2Ftext%3E%3Ctext%20x%3D%22300%22%20y%3D%22176%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3E%245%E2%80%93%2410%20surcharge%3C%2Ftext%3E%3Cpath%20d%3D%22M%20300%2078%20L%20300%20105.5%20L%20480%20105.5%20L%20480%20133%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%20fill%3D%22none%22%2F%3E%3Crect%20x%3D%22400%22%20y%3D%22133%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22white%22%20stroke%3D%22%230891b2%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22480%22%20y%3D%22158%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EWhite-Label%3C%2Ftext%3E%3Ctext%20x%3D%22480%22%20y%3D%22176%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3EHighest%20fees%3C%2Ftext%3E%3C%2Fsvg%3E) *Three ownership models determine ATM fees, services, and who maintains the machine.* - **Bank-owned ATMs**: Operated by financial institutions for their customers. Generally charge no fee for account holders. Fund replenishment and maintenance handled by the bank. - **Independent ATM deployers (IADs)**: Companies that own and operate ATMs in retail locations, airports, hotels, and convenience stores. They profit primarily from the surcharge fee. IAD machines typically charge higher fees. - **White-label ATMs**: Non-branded machines often found in gas stations or small retailers; usually owned by a third-party operator and charge the highest fees. ## Daily Withdrawal Limits ATMs enforce daily cash withdrawal limits set by your bank, typically: | Account Type | Typical Daily Withdrawal Limit | |---|---| | Standard checking | $300–$500 | | Premium checking / high balance | $500–$1,000 | | Private banking / high-net-worth accounts | $1,000–$3,000+ | | Prepaid cards | $200–$400 | These limits exist to protect against fraud (if your card is stolen, exposure is capped) and to manage the ATM's cash inventory. You can usually call your bank to temporarily raise your limit for large cash needs. ## ATM Security: Skimming and Shimming ATM fraud is a real concern: - **Card skimming**: Criminals attach a thin device over the card slot to copy magnetic stripe data, plus a hidden camera or overlay to capture your PIN. Modern EMV chip cards significantly reduced skimming effectiveness. - **Card shimming**: A newer attack targeting chip cards, a thin device inserted inside the card reader captures chip data as you insert your card. - **Shoulder surfing**: Someone watching you enter your PIN. **Best practices**: Cover the keypad when entering your PIN; use ATMs inside bank branches rather than standalone outdoor units; check for loose or unusual devices around the card slot; prefer chip transactions over swipe when available. ## ATMs in Context: Declining Usage Trends ATM cash withdrawals have been declining as digital payments, contactless cards, and mobile payments grow: - US ATM transactions peaked in the early 2000s and have declined significantly - Many UK banks have closed ATMs as cash usage fell from 60% of transactions in 2006 to under 15% by 2024 - However, ATMs remain critical for unbanked populations, small businesses, and international travelers ## Authoritative Sources For deeper background and primary-source data on this topic, the following authoritative sources are useful starting points: - [IRS](https://www.irs.gov/) - [SEC](https://www.sec.gov/) ## Conclusion ATMs are self-service banking terminals that let you withdraw cash, check balances, and transfer funds 24/7. They work through interbank networks that authenticate your identity and route transactions in real time. Fees, surcharges, foreign ATM fees, and international conversion fees, can add up substantially when using out-of-network machines. For related personal finance concepts, see our guides on [cash vs. margin accounts](/blog/cash-account-vs-margin-account) and [wire transfer vs. ACH payments](/blog/wire-transfer-vs-ach). Warren at [heywarren.com](https://heywarren.com) helps individuals understand banking products, fee structures, and financial infrastructure so they can make better day-to-day money decisions. --- ## Related Reading **More from Warren**: - [Cash Account vs. Margin Account: Key Differences Explained](/blog/cash-account-vs-margin-account) - [Wire Transfer vs. ACH: What's the Difference?](/blog/wire-transfer-vs-ach) - [Definition for Debit Card: How Debit Cards Work](/blog/definition-for-debit-card) **Authoritative sources**: - [Federal Reserve, Payments, Clearing, and Settlement](https://www.federalreserve.gov/paymentsystems/) - [FDIC, Consumer Protection: Electronic Banking](https://www.fdic.gov/consumers/consumer/news/electronic-banking.html) - [Visa, How Visa Processes Payments](https://usa.visa.com/run-your-business/payment-technology.html)