Introduction to Digital Payments, Banking Accounts, and Taxation

Core Banking and Card Infrastructure

• Debit vs. Credit Mechanics:     * Debit Cards: Linked to checking accounts; funds are verified and deducted immediately from existing deposits.     * Credit Cards: Revolving unsecured credit line; the card issuer pays the merchant, and the consumer repays the issuer over time with interest or at the end of the billing cycle.

• The Payment Rail Ecosystem: A four-party network involving:     1. The Cardholder: Initiates payment.     2. The Merchant: Receives payment via point-of-sale (POS) terminal.     3. The Acquiring Bank (Merchant's Bank): Routes transaction details to the network.     4. The Issuing Bank (Cardholder's Bank): Authorizes funds and approves/declines transactions.

• Global Card Networks: Infrastructure providers such as Visa, Mastercard, American Express, and Discover.

• Economic Impact:     * Interchange Fees: Merchants pay $1.5\%$ to $3.5\%$ per transaction, split between the processor, network, and issuing bank.     * Velocity of Money: Digital systems and unsecured credit increase spending speed and aggregate demand despite systemic debt risks.

Core Financial Accounts

• Traditional Savings: Low interest ($0.01\%$ to $0.10\%$); high liquidity via ATMs/transfers.
• High-Yield Savings (HYSA): Higher variable rates via online banks; FDIC insured up to $250,000$ per depositor.
• Brokerage Account: Taxable account for market securities; assets settle in $1$–$2$ business days.
• Roth IRA (Individual Retirement Account):     * Funding: Uses after-tax dollars.     * Growth/Withdrawals: Tax-free growth and tax-free qualified withdrawals after age $59\frac{1}{2}$.     * Limits: Annual contribution caps based on income and inflation.

Taxation and Investment Returns

• Income Tax: Progressive tax on wages and interest (savings/HYSA) at ordinary rates.
• Capital Gains Tax:     * Short-Term: Assets held for $1$ year or less; taxed at ordinary income rates.     * Long-Term: Assets held for over $1$ year; taxed at preferential rates ($0\%$, $15\%$, or $20\%$).
• Dividend Tax: Qualified dividends are taxed at long-term capital gains rates; non-qualified dividends use ordinary income rates.

Classification of Credit Cards

• Standard / Plain-Vanilla Cards: No rewards or annual fees; designed for credit building.
• Rewards Cards: subdivided into Cash Back (e.g., $1.5\%$ to $2\%$ flat or $5\%$ rotating) and Travel / Points Cards.
• Secured Credit Cards: Requires cash collateral (e.g., $\$500$) to set the credit limit; used for building credit.
• Charge Cards: No pre-set limit but requires the balance to be paid in full monthly; no interest allowed.