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Retirement plans may be classified as defined benefit or defined contribution according to how the benefits are determined. A defined benefit plan guarantees a certain payout after retirement, according to a fixed formula which usually depends on the member's salary and the number of years' membership of the plan. In a defined contribution plan, the payout is dependent upon the amount of money contributed, and the performance of the investment vehicles utilized.
Some types of retirement plans, such as cash balance plans, combine features of both defined benefit and defined contribution schemes.
Traditionally, retirement plans have been administered by institutions which exist specifically for that purpose, by large businesses, or, for government workers, by the government itself. A traditional form of defined benefit plan is the final salary plan, under which the pension paid is equal to the number of years worked, multiplied by the member's salary at retirement, multiplied by a factor known as the accrual rate.
Defined benefit plans may also be of the cash balance type with or without a formula that specifies an exact benefit at retirement in this way, whatever amount is accumulated can be available as a monthly pension at retirement or a lump sum at retirement and possibly before.
In addition, many countries offer state-sponsored retirement benefits, beyond those provided by employers, which are funded by payroll or other taxes. In the U.S., this is one role of Social Security.
Defined benefit plans may be either funded or unfunded. In a funded plan, contributions from the employer, and sometimes also from plan members, are invested in a fund towards meeting the benefits. The future returns on the investments, and the future benefits to be paid, are not known in advance, so there is no guarantee that a given level of contributions will be enough to meet the benefits. Typically, the contributions to be paid are regularly reviewed in a valuation of the plan's assets and liabilities, carried out by an actuary. In many countries, such as the USA, the UK and Australia, most private defined benefit plans are funded, because governments there provide tax incentives to funded plans.
In an unfunded plan, no funds are set aside. The benefits to be paid are met immediately by contributions to the plan. Most government run retirement plans, such as the social security system in the USA and most European countries, are unfunded, with benefits being paid directly out of current taxes and social security contributions. In some countries, such as Germany, Austria and Sweden, company run retirement plans are often unfunded.
In a defined contribution plan, contributions are paid into an individual account for each member. The contributions are invested, for example in the stock market, and the returns on the investment (which may be positive or negative) are credited to the individual's account. On retirement, the member's account is used to provide retirement benefits, often through the purchase of an annuity which provides a regular income. Defined contribution plans have become more widespread all over the world in recent years, and are now the dominant form of plan in the private sector in many countries. For example, the number of DB plans in the US has been steadily declining, as more and more employers see the large pension contributions as a large expense that they can avoid by disbanding the plan and instead offering a defined contribution plan.
Examples of defined contribution plans in the USA include Individual Retirement Accounts (IRAs) and 401(k) plans. In such plans, the employee is responsible, to one degree or another, for selecting the types of investments toward which the funds in the retirement plan are allocated. This may range from choosing one of a small number of pre-determined mutual funds to selecting individual stocks (or other securities). Most self-directed retirement plans are characterized by certain tax advantageTax advantage refers to the economic bonus which applies to certain accounts or investments that are, by statute, tax-reduced, tax-deferred, or tax-free. The most obvious examples are Retirement plans, but investments in many state or municipal bonds cans, and some provide for a portion of the employee's contributions to be matched by the employer. In exchange, the funds in such plans may not be withdrawn by the investor prior to reaching a certain age--typically the year the employee reaches 59.5 years old--(with a small number of exceptions) without incurring a substantial penalty.
Money contributed can either be from employee salary deferral or from employer contributions or matching. Defined contribution plans are subject to IRS limits on how much can be contributed, known as the section 415 limit. The total deferral amount including the employee and employer contribution is the lesser of $40,000 or 100% of compensation. The employee only amount is $13,000 for 2004 with a $3,000 catch up. These amounts increases in 2005 and 2006.