A budget is a guide to spending that ensures all expenses will be paid on time, given there aren't any significant changes. Even if changes occur, a budget comes to the rescue because saving for emergencies should be part of every budget. Think of a budget as a moving picture which takes place over time. Costs are a snapshot in the present and may go down or up in the future.
Budgets are developed for different time periods and in several layers of detail. A monthly budget covers all the expenses such as rent or mortgage payments, car leases or payments, utilities, food and gas. What should also be covered are expenses that don't occur every month, such as car insurance, medical bills and vacations. If you know the cost of your annual checkup, divide it by 12 and set aside that amount every month.
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Budgets are compiled for the future. The cost of something takes place in the present. In some cases the cost is known for budgeting purposes, such as lease payment. In others the cost, such as medical services, is estimated on what has been spent in the past.
Costs are what a service or product requires in payment. The payment may be in cash or in payments paid in the future. A house costs more than what most families can afford to pay in one lump sum. A mortgage or loan covers the purchase price of the home, plus the cost, or interest for the loan. In reality the true cost of owning the home may be two or three times the purchase price when the interest is factored into the cost. When figuring the true cost of an acquisition, consider the purchase price and the cost of obtaining the financing.
Income and Outgo
A budget requires estimating both what the income will be and the expected outgo, or payments. Costs only affect the outgo or payments. A budget is adjusted to differences in income. If the family income drops, certain discretionary items such as entertainment will be eliminated, followed by those items that have some leeway in their usage, such as groceries and utilities. Costs are only negotiable before purchase. In other words, if you're buying a new car, the price is negotiable before you buy it, but you can't decide afterward you've paid too much and lower the cost retroactively or adjust the car payments in the future.