What is the main difference between alimony and child support?

Alimony (spousal support) is paid to support a former spouse, while child support is paid to support children. They serve different purposes, are calculated differently, and have different tax implications.

Can I receive both alimony and child support?

Yes. They are separate obligations and are calculated independently. A court may order one parent to pay both alimony and child support to the other parent.

Is alimony tax deductible?

For divorces finalized after December 31, 2018, alimony is not tax-deductible for the payer and not taxable for the recipient. Child support has never been tax-deductible.

Which lasts longer, alimony or child support?

It depends on the case. Child support typically ends when the child turns 18. Alimony duration varies widely — it may be temporary (during divorce proceedings), rehabilitative (for a set period), or permanent (in long marriages).

Can alimony be reduced if child support increases?

In some cases, yes. Courts consider the total financial picture. If child support obligations significantly impact the payer's ability to meet alimony obligations, a modification may be warranted.

Alimony vs Child Support: Key Differences You Need to Know

Definitions: Alimony vs Child Support

Alimony (also called spousal support or maintenance) is a court-ordered payment from one former spouse to another after a divorce. Its purpose is to help the lower-earning spouse maintain a standard of living reasonably close to what they had during the marriage.

Child support is a court-ordered payment from one parent to another to help cover the costs of raising their shared children. It is based on the legal principle that both parents have a financial obligation to support their children.

While both involve financial transfers between former spouses, they are fundamentally different in purpose, calculation, tax treatment, and legal framework.

Purpose and Beneficiary

Factor	Alimony	Child Support
Paid to	Former spouse	Custodial parent (for the child)
Purpose	Support the spouse's living standard	Cover child-rearing costs
Who benefits	The receiving spouse	The child
Discretionary	Court decides based on need	Required by law in most cases
Can be waived	Yes, by agreement	Generally no (child's right)

Tax Implications

The tax treatment of alimony and child support differs significantly:

Alimony (for divorces finalized after December 31, 2018): Not tax-deductible for the payer and not considered taxable income for the recipient. The Tax Cuts and Jobs Act of 2017 eliminated the deduction for the payer and the income inclusion for the recipient for post-2018 divorces.

Child support: Never tax-deductible for the paying parent and never considered taxable income for the receiving parent. This has been the rule consistently.

For divorces finalized before 2019, alimony was deductible by the payer and taxable to the recipient. If your divorce was finalized before this date, the old rules still apply to your existing order.

Duration

Alimony duration varies based on the length of the marriage and other factors:

Temporary alimony: During divorce proceedings only
Rehabilitative alimony: For a set period to help the recipient become self-supporting
Permanent alimony: Ongoing, typically for long marriages (less common now)
Lump-sum alimony: A one-time payment instead of ongoing support

Child support duration is more predictable:

Until the child turns 18 (or 19 if still in high school in most states)
Possibly through college in some states
Indefinitely for children with special needs

Calculation Methods

Child support is calculated using state-specific formulas that primarily consider both parents' incomes and the number of children. The calculations are relatively predictable and formula-driven. Use our child support calculator for an estimate.

Alimony is more subjective. Courts consider a wide range of factors:

Length of the marriage
Each spouse's income and earning capacity
Standard of living during the marriage
Age and health of each spouse
Contributions to the marriage (including homemaking)
Education and career sacrifices
Custody arrangements

Modification Rules

Both alimony and child support can be modified, but under different standards:

Child support modification requires a showing of a significant change in circumstances, such as a substantial change in income, changes in custody, or changes in the child's needs. Many states require a 15-20% change in the calculated amount.

Alimony modification depends on the type of alimony and the terms of the divorce agreement. Some alimony awards are non-modifiable by agreement. When modification is possible, courts look at changes in income, remarriage (which typically terminates alimony), cohabitation, retirement, and health changes.

Enforcement

Both alimony and child support are enforceable through court orders, but child support has stronger enforcement tools:

Child support enforcement includes wage garnishment, tax refund interception, license suspension, passport denial, credit reporting, and criminal contempt proceedings. State child support enforcement agencies actively pursue delinquent parents.

Alimony enforcement relies more on contempt of court proceedings and wage garnishment. There is generally no dedicated government agency that pursues alimony enforcement as aggressively as child support.

How They Interact

Alimony and child support can affect each other in several ways:

Alimony received may be considered as income when calculating child support obligations
High child support obligations may reduce the ability to pay alimony
Courts consider the total financial picture when determining both types of support
Some states calculate child support first, then determine alimony based on remaining income

For help with child support calculations, try our free calculator or browse our state-specific guides.