From the IRS website:You can receive income in the form of money, property, or services. This section discusses many kinds of income that are taxable or nontaxable. It includes discussions on employee wages and fringe benefits, and income from bartering, partnerships, S corporations, and royalties. The information on this page should not be construed as all-inclusive. Other steps may be appropriate for your specific type of business.Generally, an amount included in your income is taxable unless it is specifically exempted by law. Income that is taxable must be reported on your return and is subject to tax. Income that is nontaxable may have to be shown on your tax return but is not taxable. A list is available in Publication 525, Taxable and Nontaxable Income.Constructively-received income. You are generally taxed on income that is available to you, regardless of whether it is actually in your possession.A valid check that you received or that was made available to you before the end of the tax year is considered income constructively received in that year, even if you do not cash the check or deposit it to your account until the next year. For example, if the postal service tries to deliver a check to you on the last day of the tax year but you are not at home to receive it, you must include the amount in your income for that tax year. If the check was mailed so that it could not possibly reach you until after the end of the tax year, and you could not otherwise get the funds before the end of the year, you include the amount in your income for the next year.Assignment of income. Income received by an agent for you is income you constructively received in the year the agent received it. If you agree by contract that a third party is to receive income for you, you must include the amount in your income when the party receives it.Example. You and your employer agree that part of your salary is to be paid directly to your former spouse. You must include that amount in your income when your former spouse receives it.Prepaid income. Prepaid income, such as compensation for future services, is generally included in your income in the year you receive it. However, if you use an accrual method of accounting, you can defer prepaid income you receive for services to be performed before the end of the next tax year. In this case, you include the payment in your income as you earn it by performing the services.Employee CompensationGenerally, you must include in gross income everything you receive in payment for personal services. In addition to wages, salaries, commissions, fees, and tips, this includes other forms of compensation such as fringe benefits and stock options.You should receive a Form W-2, Wage and Tax Statement, from your employer showing the pay you received for your services.Childcare providers. If you provide child care, either in the child's home or in your home or other place of business, the pay you receive must be included in your income. If you are not an employee, you are probably self-employed and must include payments for your services on Schedule C (Form 1040), Profit or Loss From Business, or Schedule C-EZ (Form 1040), Net Profit From Business. You generally are not an employee unless you are subject to the will and control of the person who employs you as to what you are to do and how you are to do it.Babysitting. If you babysit for relatives or neighborhood children, whether on a regular basis or only periodically, the rules for childcare providers apply to you.Fringe BenefitsFringe benefits you receive in connection with the performance of your services are included in your income as compensation unless you pay fair market value for them or they are specifically excluded by law. Abstaining from the performance of services (for example, under a covenant not to compete) is treated as the performance of services for purposes of these rules.Recipient of fringe benefit. You are the recipient of a fringe benefit if you perform the services for which the fringe benefit is provided. You are considered to be the recipient even if it is given to another person, such as a member of your family. An example is a car your employer gives to your spouse for services you perform. The car is considered to have been provided to you and not your spouse.You do not have to be an employee of the provider to be a recipient of a fringe benefit. If you are a partner, director, or independent contractor, you can also be the recipient of a fringe benefit.Business and Investment IncomeRents from personal property. If you rent out personal property, such as equipment or vehicles, how you report your income and expenses is generally determined by:Whether or not the rental activity is a business, andWhether or not the rental activity is conducted for profit.Generally, if your primary purpose is income or profit and you are involved in the rental activity with continuity and regularity, your rental activity is a business. See Publication 535, Business Expenses, for details on deducting expenses for both business and not-for-profit activities.Partnership IncomeA partnership generally is not a taxable entity. The income, gains, losses, deductions, and credits of a partnership are passed through to the partners based on each partner's distributive share of these items. For more information, refer to Publication 541.Partner's distributive share. Your distributive share of partnership income, gains, losses, deductions, or credits generally is based on the partnership agreement. You must report your distributive share of these items on your return whether or not they actually are distributed to you. However, your distributive share of the partnership losses is limited to the adjusted basis of your partnership interest at the end of the partnership year in which the losses took place.Partnership return. Although a partnership generally pays no tax, it must file an information return on Form 1065, U.S. Return of Partnership Income. This shows the result of the partnership's operations for its tax year and the items that must be passed through to the partners.S Corporation IncomeIn general, an S corporation does not pay tax on its income. Instead, the income, losses, deductions, and credits of the corporation are passed through to the shareholders based on each shareholder's pro rata share. You must report your share of these items on your return. Generally, the items passed through to you will increase or decrease the basis of your S corporation stock as appropriate.S corporation return. An S corporation must file a return on Form 1120S, U.S. Income Tax Return for an S Corporation. This shows the results of the corporation's operations for its tax year and the items of income, losses, deductions, or credits that affect the shareholders' individual income tax returns. For additional information, see the Instructions for Form 1120S.RoyaltiesRoyalties from copyrights, patents, and oil, gas and mineral properties are taxable as ordinary income.You generally report royalties in Part I of Schedule E (Form 1040), Supplemental Income and Loss. However, if you hold an operating oil, gas, or mineral interest or are in business as a self-employed writer, inventor, artist, etc., report your income and expenses on Schedule C or Schedule C-EZ.For additional information, refer to Publication 525, Taxable and Nontaxable Income.Virtual CurrenciesThe sale or other exchange of virtual currencies, or the use of virtual currencies to pay for goods or services, or holding virtual currencies as an investment, generally has tax consequences that could result in tax liability. This guidance applies to individuals and businesses that use virtual currencies.BarteringBartering is an exchange of property or services. You must include in your income, at the time received, the fair market value of property or services you receive in bartering. For additional information, Refer to Tax Topic 420 - Bartering Income and Barter Exchanges.Earned income includes all the taxable income and wages you get from working or from certain disability payments.There are two ways to get earned income:You work for someone who pays youorYou own or run a business or farmTaxable earned income includes:Wages, salaries, tips, and other taxable employee pay;Union strike benefits;Long-term disability benefits received prior to minimum retirement age;Net earnings from self-employment if: You own or operate a business or a farm or You are a minister or member of a religious order (see Special Rules page for more information);You are a statutory employee and have income. (See definition of statutory employee on our Helpful Definitions and Acronyms for EITC page).Nontaxable Combat Pay election. You can elect to have your nontaxable combat pay included in earned income for EITC. The amount of your nontaxable combat pay should be shown on your Form W-2, in box 12, with code Q. Electing to include nontaxable combat pay in earned income may increase or decrease your EITC. See Publication 3. Armed Forces Tax Guide, for more information.Examples of income that are not earned income:Pay received for work while an inmate in a penal institutionInterest and dividendsRetirement incomeSocial securityUnemployment benefitsAlimonyChild support.