California enacted the first no-fault divorce law in the United States when Governor Ronald Reagan signed the Family Law Act of 1969; the statute took effect on January 1, 1970. Other states followed through the 1970s and 1980s, and New York became the fiftieth and final state to adopt no-fault divorce in 2010. So the question of when no-fault divorce became law has two answers depending on what you mean: 1969 for the first state, 2010 for the entire country.
California, 1969: The First State
Reagan signed the Family Law Act a few days after Labor Day in 1969, and it took effect on New Year’s Day 1970. California did not simply add a no-fault option alongside the old grounds. It replaced every fault-based ground for divorce with a single standard: “irreconcilable differences” that had caused the “irremediable breakdown of the marriage.”
The law also stripped fault out of the financial side of divorce. Adultery or cruelty by one spouse could no longer influence spousal support or property division. That made California a “pure” no-fault jurisdiction from the start, and it set the template that reformers in other states would spend the next four decades arguing over.
Why 1969 and Not Earlier
The idea was not new in the 1960s. The National Association of Women Lawyers voted in 1947 to draft a model no-fault bill, arguing that “common thought today is that divorce is a remedy for domestic incompatibility and should be granted when the parties consent.” NAWL formally approved the model bill in 1952 and lobbied the National Conference of Commissioners on Uniform State Laws to adopt it.
The effort stalled for years. The Commissioners refused to consider proposals that did not come through the American Bar Association, and NAWL had to help establish the ABA’s Family Law Section just to get a seat at the table. Legislative movement remained frozen for more than a decade. The cultural shifts of the 1960s, along with growing recognition that fault-based divorce was harming the families it claimed to protect, finally created the political conditions for California to act.
What No-Fault Replaced
Before 1970, ending a marriage required convincing a court that your spouse had done something specifically wrong. Common grounds included adultery, cruelty, desertion, imprisonment, or inability to consummate the marriage. The spouse seeking the divorce carried the burden of proof, which often meant private investigators, subpoenaed witnesses, and personal details aired in open court.
The system produced predictable workarounds. Couples who both wanted out sometimes staged evidence of adultery or colluded on testimony because the law offered no honest route to separation. Contested cases ran for months or years and generated large legal bills. That is the system no-fault divorce was designed to end.
How the Law Spread After California
States moved quickly once California had gone first. The National Conference of Commissioners on Uniform State Laws approved the Uniform Marriage and Divorce Act in 1970, giving legislatures a ready template. Throughout the 1970s and 1980s, state after state added no-fault grounds. Most took a more cautious path than California by keeping fault-based options available alongside the new no-fault route.
By the mid-1980s, the large majority of states had enacted some form of no-fault divorce. The remaining holdouts fell into line through the 1990s and 2000s. For the purpose of a national timeline, the key dates are 1969 (first law passed), 1970 (first law effective and Uniform Act approved), and 2010 (last state).
New York, 2010: The Last State
New York was the final state to adopt no-fault divorce, after years of failed attempts. The 2010 law added a seventh ground to New York’s Domestic Relations Law: that “the relationship between husband and wife has broken down irretrievably for a period of at least six months.”1New York State Senate. New York Domestic Relations Law 170
Before that change, New York was the only state still requiring one spouse to prove the other’s fault, or else live apart under a formal separation agreement for a full year. The Democratic majority in the legislature passed the bill, framing it as bringing the state’s marriage law “into the 21st century.”2New York State Senate. Majority Brings Marriage Law Into 21st Century Governor David Paterson signed it in August 2010, and it took effect 60 days later.3New York State Unified Court System. No-Fault Divorce Legislation
Where No-Fault Divorce Stands Today
All 50 states and the District of Columbia now allow no-fault divorce. The details vary. About 15 states are pure no-fault jurisdictions where fault-based divorce no longer exists at all, including California, Colorado, Florida, Hawaii, Iowa, Kentucky, Michigan, Minnesota, Missouri, Montana, Nebraska, Oregon, and Washington. In these states, you cannot plead adultery or cruelty as a legal ground for divorce even if you want to.
The remaining states keep both options. A spouse can file on no-fault grounds or choose a traditional fault ground. Terminology differs by state. The two most common phrases are “irreconcilable differences” and “irretrievable breakdown of the marriage,” with a handful of states using “incompatibility” or “insupportability.” The practical meaning is the same: the marriage is over and cannot be repaired.
One point worth knowing: no-fault divorce means you do not have to prove wrongdoing to end a marriage. It does not mean fault is irrelevant to everything that happens in a divorce. In many states, misconduct can still influence spousal support, property division, or custody, even when the divorce itself is filed on no-fault grounds.
Recent Efforts to Restrict No-Fault Divorce
After more than 50 years as settled law, no-fault divorce has drawn renewed political scrutiny. In 2025, a Texas bill sought to repeal the state’s no-fault ground entirely by eliminating the “insupportability” provision in the Family Code. The bill died without becoming law. That same year, an Indiana bill would have required couples with children to provide witness testimony that their marriage was irretrievably broken before a no-fault divorce could proceed; it was withdrawn after public backlash. Similar proposals have surfaced in Louisiana, Nebraska, and Oklahoma without advancing past the committee stage.
For now, no-fault divorce remains available in every state. No restriction bill has come close to passage, but the debate is active enough to watch, particularly in states that already offer covenant marriage as a more restrictive opt-in alternative.