What Is Income Tax?
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Key takeaways
Federal income tax uses a progressive system where marginal tax rates scale from 10% to 37% as taxable income increases.
Your marginal rate applies only to the top slice of your earnings, whereas your effective tax rate reflects the actual blended percentage paid across your entire income pool.
Individual states dictate their own tax structures, implementing either progressive brackets, a single flat percentage, or charging no state income tax at all.
Strategic cash management, such as holding cash reserves in high-yield savings accounts or certificates of deposit (CDs) through Raisin, helps maximize your money's growth through a single secure login.
Seeing a portion of your hard-earned paycheck diverted toward taxes can be challenging, but understanding the mechanics behind these contributions is a foundational part of your broader financial journey. These funds are structurally designated by law to finance national defense, infrastructure projects, public education, Social Security administration, and other shared domestic services.
Filing and paying federal income tax returns is a legal responsibility for individuals and businesses operating in the U.S. In this comprehensive guide, we will break down exactly how income taxes work across the federal and state levels, how your total liability is calculated, and how to manage your cash effectively while optimizing your tax-deferred or taxable savings.
What is federal income tax?
Federal income tax is a government-mandated tax levied by the Internal Revenue Service (IRS) on the annual earnings of individuals, corporations, trusts, and other legal entities. It applies to all forms of net income earned within the U.S., scaling progressively through marginal tax brackets ranging from 10% to 37%.
The baseline amount of federal income tax you owe is determined by a progressive tax system. Under this methodology, as your taxable income moves past specific statutory thresholds, those additional dollars are taxed at higher percentages. All common categories of revenue are subject to federal taxation, including traditional wages, hourly salaries, alimony payments, and net rental real estate profits.
Your overall financial footprint isn't the sole variable that dictates what you pay during the annual filing window. Every taxpayer is categorized under a specific filing status, typically dictated by their marital status and domestic arrangements on the final day of the calendar year. You may qualify to file under one of the following designations:
Single
Married filing jointly
Married filing separately
Head of household
Qualifying surviving spouse
Choosing the correct filing status is essential, as it directly determines your mandatory filing requirements, the size of your standard deduction, and your overall eligibility for specific tax credits. For the current tax year, federal marginal tax brackets remain distributed across seven tiers: 10%, 12%, 22%, 24%, 32%, 35%, and 37%.
What percentage of income is taxed?
Because the U.S. uses a progressive tax structure, you do not pay one flat percentage across all your earnings. Instead, your income is partitioned into sequential segments, with each segment taxed at its corresponding marginal rate. You only face the highest tax percentage on the specific portion of your income that climbs into that top bracket.
To understand how this impacts your actual bottom line, it is useful to evaluate the distinction between your top marginal bracket and your actual effective tax rate:
Understanding marginal vs. effective tax rates
Your true effective tax rate is routinely minimized below your marginal rate by taking advantage of statutory deductions, exemptions, and direct tax credits. Understanding this difference allows for more accurate estimations of your net cash flow, making it easier to determine how much money you can comfortably allocate toward high-yield savings products.
Tax Rate Type | Core Definition | Portfolio Impact |
Marginal Tax Rate | The specific percentage tier applied to the very last dollar of your taxable income. | Determines the tax impact on your next dollar of earnings. |
Effective Tax Rate | The actual, blended percentage of your total income paid to the IRS after all calculations. | Reflects your true financial tax burden and is almost always lower than your marginal rate. |
What is state income tax?
In addition to any federal obligations, many individual states impose a separate state income tax. Each state retains sovereign legislative control over its internal tax codes, meaning revenue collection methods vary dramatically depending on where you reside and where your income is physically generated.
Depending on your geography, your state may implement one of three main systems:
A progressive state income tax featuring escalating brackets modeled after the federal framework
A flat tax rate where a uniform percentage is applied to all taxable income, completely independent of total earnings
No state income tax, where state budgets are instead funded through elevated localized sales taxes or property tax assessments
If you commute across state lines or work remotely for an out-of-state employer, you may owe income taxes to the state where the work was performed. However, many neighboring states maintain formal reciprocity agreements, allowing workers to file and pay income taxes exclusively in their primary state of residence.
What is income tax liability?
Income tax liability is the total, absolute dollar amount of tax debt you legally owe to municipal, state, and federal governments for a single tax year. This figure is calculated by applying the relevant tax brackets to your final taxable income, minus any withholding payments or estimated cash distributions made throughout the year.
To calculate your total income tax liability, the IRS separates your total financial inflows into taxable and non-taxable categories.
Federal taxability matrix
General Taxable Income Categories | Non-Taxable Income Categories (Exclusions) |
Earned income including hourly wages, corporate salaries, tips, and bonuses Investment yields including short-term capital gains, ordinary dividends, and taxable interest Net business profits, freelance consulting fees, and side-hustle revenue Public unemployment benefits and specific portions of re... | Capital received as formal personal gifts up to statutory annual exclusions Financial inheritances transferred via estates Tax-free payouts from life insurance policies Child support payments received from a former spouse Supplemental Security Income (SSI) and standard welfare benefits Qualified aca... |
How can you lower your federal income tax percentage?
Minimizing your federal income tax liability down to the lowest legal amount requires strategic planning. There are three primary pathways used by taxpayers to reduce their tax exposure:
Taking the standard deduction: This method allows you to subtract a fixed, legally predefined sum directly from your adjusted gross income. This immediately lowers your total taxable income pool and can potentially drop your remaining earnings into a lower marginal tax bracket.
Itemizing your deductions: If you have significant qualifying expenses, such as mortgage interest, state and local tax assessments (SALT), or substantial charitable contributions, itemizing may allow you to deduct more total capital than the standard deduction provides.
Claiming tax credits: Unlike deductions, which lower your taxable income base, tax credits provide a direct, dollar-for-dollar reduction of your final income tax liability. Common examples include the Child Tax Credit, the Earned Income Tax Credit (EITC), and various higher education credits.
Grow your tax savings with Raisin
Effectively reducing your tax liability often frees up meaningful cash reserves. To keep that extra liquidity working hard for your future, where you choose to deposit it matters. Many taxpayers choose to move excess liquidity into high-yield accounts to help mitigate the effects of inflation. On the other hand, moving money between separate banks to catch competitive rates can create a complex web of accounts, statements, and logins.
The Raisin platform provides a simple, modern solution. By opening a single, no-fee account at raisin.com, you gain immediate access to a wide marketplace of high-yield savings accounts, money market deposit accounts, and fixed-term certificates of deposit (CDs) from a diverse network of financial institutions. Rather than navigating multiple banking applications, you can fund, optimize, and distribute your savings through one single dashboard.
Institutional security and stability
Every bank and credit union accessible through the Raisin platform is a thoroughly vetted, federally insured institution. Your deposits are held by FDIC-member banks and NCUA-insured credit unions and are eligible for deposit insurance protection of up to $250,000 per depositor, per institution, subject to certain conditions.
Whether you are seeking to maximize liquidity for upcoming quarterly tax payments or want to lock in a premium return with a fixed-term CD, Raisin streamlines your savings journey.
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The above article is intended to provide generalized financial information designed to educate a broad segment of the public; it does not give personalized tax, investment, legal, or other business and professional advice. Before taking any action, you should always seek the assistance of a professional who knows your particular situation for advice on taxes, your investments, the law, or any other business and professional matters that affect you and/or your business.
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*APY means Annual Percentage Yield. APY is accurate as of July 1, 2026. Interest rate and APY may change after initial deposit depending on the terms of the specific product selected. Minimum opening deposit is $1.00.
Raisin is not an FDIC-insured bank, and FDIC deposit insurance only covers the failure of an insured bank.
Raisin is not an NCUA-insured credit union. NCUA deposit insurance only covers the failure of an insured credit union.
Raisin does not hold any customer funds. Customer funds are held in various custodial deposit accounts. Each customer authorizes the Custodial Bank to hold the customer’s funds in such accounts, in a custodial capacity, in order to effectuate the customer’s deposits to and withdrawals from the various bank and credit union products that the customer requests through Raisin.com. The Custodial Bank does not establish the terms of the bank or credit union products and provides no advice to customers about bank or credit union products offered by the applicable bank or credit union through Raisin.com. Each customer also authorizes the Service Bank to move funds among the various banks and credit unions at the customer’s request. First International Bank & Trust (FIBT), Member FDIC, is the Service Bank. Bell Bank and Starion Bank, each Member FDIC, are the Custodial Banks.
†Based on $250,000 in FDIC or NCUA insurance coverage per insurable category of ownership at each partner bank or credit union on the Raisin platform (each a "Product Bank"), when aggregated with all other deposits held by you at such Product Bank and in the same insurable category. Deposits made through Raisin will be eligible to receive deposit insurance from the FDIC or the NCUA (each a "Deposit Insurer") in accordance with and up to the maximum amount permitted by law at each Product Bank. Raisin is not a bank or credit union and does not hold any customer funds. Funds are held at FDIC-insured banks and NCUA-insured credit unions. Deposit insurance covers the failure of an insured bank or credit union. Certain conditions must be satisfied for pass through deposit insurance coverage to apply. Customers may choose to deposit funds with identically registered accounts at different Product Banks on the Raisin platform to be eligible for Deposit Insurer coverage up to $10 million for individual accounts and $20 million for joint accounts when at least 40 Product Banks are utilized. Please be aware, however, that any deposits you have at a Product Bank, whether through the Raisin platform or outside the Raisin platform, that you may hold in the same capacity (such as in an individual capacity or joint capacity) count toward the applicable Deposit Insurer's deposit insurance maximum amount, and any such amounts that you hold in the same capacity at a Product Bank that exceed the maximum insurance coverage by the applicable Deposit Insurer will not be insured. For more information on FDIC deposit insurance, please see here. For more information on the NCUA share insurance fund, please see here. You are solely responsible for monitoring the amount of funds you have on deposit at each a Product Bank, whether through the Raisin platform or outside the Raisin platform, to confirm that the deposits you hold in the same capacity at each Product Bank do not exceed the maximum deposit insurance coverage provided by the applicable Deposit Insurer.