There are two thpes of income:
Taxable income and non-taxable income

Taxable income is any income that is subject to tax. It must be reported on a tax return, unless the amount is less than the required amount of income to file. Types of taxable income:

• Wages, salaries, bonuses, and commissions
• Tips and other compensation for personal services
• Interest/Dividends (unless tax-exempt)
• Alimony received or separate maintenance payments received
• Recoveries of items deducted in prior year(s)
• Business income
• Hobby income (a hobby loss is not deductible)
• Capital gains 
• Gain from the sale of property 
• Pensions and annuities (part may be nontaxable)
• IRA distributions (part or all may be nontaxable)
• Refunds from state overpaid taxes
• Rents received
• Royalties
• Estate, trust or K-1 income
• Unemployment compensation
• Railroad retirement benefits (part may be taxable)
• Social security benefits (part may be taxable)
• Jury duty pay
• Executors' fees
• Gambling winnings (including lotteries, contests, raffles, etc.) (losses may be deducted against winnings) 
• Non qualifying scholarships and fellowships
• Payments for punitive damages and compensatory damages not attributable to physical injuries or sickness.
• Bartering income
• Some cancelled debts
• Foster care payments
• Military pensions

Nontaxable Income is income that is exempt from tax. If a return must be filed, some types of nontaxable income will be shown on your return but will not be added into the amount of income subject to tax. The following types of income are nontaxable:

• Child support
• Gifts, bequests and inheritances (may be subject to other taxes)
• Life insurance proceeds
• Certain veteran’s benefits
• Buildup of cash or loan value of life insurance
• Insurance reimbursement of medical expenses not previously deducted
• Most life insurance proceeds paid upon death
• Public assistance payments
• Workers' compensation
• Dividends on veteran’s life insurance loans
• Compensatory damages for personal physical injury or physical illness
• SSI payments

 LIMITS ON TAXABLE INCOME BEFORE YOU HAVE TO FILE:

Single                                    ( $8,750 if under 65 years)   ( $10,050 if over 65)
Married fiiling joint                ( $17,500 if both under 65)  (18,550 only one over 65) $19,600 if both over
Married filing separate          ($3,400) any age
Head of household                ($11,250 if under 65)  (12,550 if  65 and over
Qualifying Widow with a dependent ($14,100 if over 65)  $15,150 if 65 or older

Dependents of another tax payer

You must file a tax return if:

 you are a single dependent: if unearned income is more thean $850.00

                                      or   your earned income is more than $5350.00