Whose or what specific income should be included in a child support calculation for Colorado?

Colorado Revised Statutes 14-10-115 sets forth the guidelines for determining child support.  It contains all of the information you need to determine what is included.  You can find it at www.michie.com  Generally, gross income includes income from any source except for child support received, government assistance such as food stamps, income from additional jobs that result in more than 40 hours per week, social security received on behalf of the children, etc.  See 14-10-115(5)(a)(II).  Otherwise, gross income includes salaries, wages, tips, commissions, bonuses, dividends, severance, pensions and retirement benefits, royalties, rents, interest, trust income, annuities, capital gains, social security, worker's compensation, unemployment, disability, insurance income, monetary gifts and prizes, taxable distributions, expense reimbursements or in-kind payments, alimony or maintenance, and overtime if overtime is required by the employer as a condition of employment.  See 14-10-115(5)(a)(I). Bonuses can be tricky since they are not guaranteed.  If you have been in the job for a while, you will typically use your prior tax returns as a bench mark.  Only the children's parent's income is considered, not any new spouses.