Does Couples Therapy Work? What the Research Actually Says

1Does couples therapy work overall?

On average, yes, and the research on this is fairly consistent. The more useful question is how much it helps, for how many couples, and in what conditions.

Researchers usually report results as an effect size: a number that expresses how much change happened in standardized units, so studies using different questionnaires can be compared. A bigger number means more change. A meta-analysis is a study that pools the results of many studies.

The largest recent meta-analysis pooled 58 studies (2,092 couples). Couples' satisfaction rose from the start to the end of therapy with an effect size of 1.12, which the authors describe as large, while couples on waiting lists showed a non-significant change of 0.12. [Source: Roddy et al., 2020, Journal of Consulting and Clinical Psychology] That 1.12 compares couples with themselves before and after therapy, so it tends to run higher than comparisons against a control group.

A stricter meta-analysis used only randomized controlled trials, where couples are assigned by chance to therapy or a comparison condition. Across 33 trials and 2,730 participants, the effect at the end of treatment was 0.60, which the authors call medium, and they caution about possible publication bias. [Source: Rathgeber et al., 2019, Journal of Marital and Family Therapy] An earlier meta-analysis of 30 trials of behavioural marital therapy found an effect of 0.585 against no treatment, with signs that missing small studies may inflate the estimate. [Source: Shadish & Baldwin, 2005, Journal of Consulting and Clinical Psychology]

How many couples improve, recover, stay the same, or get worse?

Studies separate couples who reliably improved (changed more than measurement error would explain) from those who recovered (moved into the range of non-distressed couples). In the largest trial of behavioural approaches, with 134 seriously and chronically distressed married couples, 71% in one treatment group and 59% in the other were reliably improved or recovered at the end of treatment. [Source: Christensen et al., 2004, Journal of Consulting and Clinical Psychology] The rest did not reliably improve.

Reviews put the overall picture at about 70% of couples positively affected [Source: Lebow et al., 2012, Journal of Marital and Family Therapy] and 60 to 80% benefiting in trials. [Source: Bradbury et al., 2020, Annual Review of Clinical Psychology] Reviews also note that a sizeable share of couples do not improve, and some deteriorate after therapy [Source: Snyder et al., 2005, Annual Review of Psychology]. No reliable pooled percentage for how many couples get worse could be verified, so we do not quote one.

Results are smaller outside research settings. A German nationwide study of 554 couples in ordinary counselling services found improvements about half the size of those in controlled trials, with up to 50% of couples not improving. [Source: Roesler, 2020, Family Process] A meta-analysis of 48 non-randomized studies found an effect of 0.522 on relationship outcomes. [Source: Owen et al., 2023, Family Process]

2Which approaches have the strongest evidence?

A review of 2010 to 2019 research classed behavioural, cognitive-behavioural, emotionally focused and integrative behavioural couple therapy as well-established for relationship distress. [Source: Doss et al., 2021, Journal of Marital and Family Therapy] A 2026 review applying stricter criteria found that no model met the bar for strong support, mostly because of small samples and little independent replication, and rated seven models, including all three below, as having modest support. [Source: Jackson et al., 2026, Journal of Marital and Family Therapy]

Emotionally focused therapy (EFT)

EFT is based on attachment theory. It helps partners recognize the negative cycle they get stuck in and express the needs and fears underneath it. In the randomized-trials meta-analysis, EFT's effect was 0.73 at the end of treatment and 0.66 six months later. [Source: Rathgeber et al., 2019, Journal of Marital and Family Therapy] A systematic review of nine randomized trials reported a much larger before-and-after effect of 2.09. [Source: Beasley et al., 2019, Journal of Evidence-Informed Social Work] The recovery percentages often quoted from EFT's 1999 meta-analysis could not be verified against the original paper, so we do not repeat them. An earlier review concluded EFT's gains were shown mainly for mild to moderate distress [Source: Byrne et al., 2004, Contemporary Family Therapy], and much of the EFT research involves the model's founder. [Source: Wiebe & Johnson, 2016, Family Process]

The Gottman Method

The Gottman Method grew out of John Gottman's observational research on how couples argue, repair and build friendship. Its outcome evidence is thinner. A pilot randomized trial for couples recovering from infidelity randomized 49 couples, but only 19 completed all assessments; Gottman therapy did better than usual treatment on trust, conflict and satisfaction. [Source: Irvine et al., 2023, The Family Journal] An uncontrolled study of 106 gay and lesbian couples found significant improvement after 11 sessions. [Source: Garanzini et al., 2017, Journal of Marital and Family Therapy] Several small trials come from Iran, for example one with 16 couples. [Source: Davoodvandi et al., 2018, Iranian Journal of Psychiatry] We found no long-term follow-up studies of Gottman Method therapy, which is part of the picture: the approach is widely used, but its published outcome research is mostly small and short-term.

Behavioural and integrative behavioural couple therapy (BCT and IBCT)

BCT teaches communication, problem-solving and increasing positive behaviour. IBCT adds strategies for emotional acceptance of differences that will not change. In the 134-couple trial, before-and-after effects were 0.90 for IBCT and 0.71 for traditional BCT, a difference that was not significant. [Source: Christensen et al., 2010, Journal of Consulting and Clinical Psychology] BCT's effect in the randomized-trials meta-analysis was 0.53 at the end of treatment. [Source: Rathgeber et al., 2019, Journal of Marital and Family Therapy] IBCT was developed by Christensen and Jacobson, and its key trial was led by its developers. [Source: Roddy et al., 2016, Family Process]

3How many sessions does it usually take?

In a US practice research network of 417 mixed-sex couples, couples attended an average of 11.73 sessions; treatment ran longer when one partner was highly distressed or both partners were depressed. [Source: Morgan et al., 2026, Journal of Marital and Family Therapy] Research courses are often longer: the large behavioural trial offered about eight months of therapy [Source: Christensen et al., 2010, Journal of Consulting and Clinical Psychology], and one EFT follow-up sample averaged 21 sessions. [Source: Wiebe et al., 2017a, Journal of Marital and Family Therapy]

There is little dose-response research specific to couples, meaning research on how outcomes change with each added session. In non-randomized studies, more sessions were linked to better individual outcomes. [Source: Owen et al., 2023, Family Process] We could not find a reliable couples-specific figure for how many sessions it takes for half of couples to improve; the dose-response research that exists is about individual therapy.

4How long do couples wait, and does waiting matter?

You have probably read that couples wait about six years before getting help. We could not trace that figure to a published study, and the first large study on the question describes it as widely cited but poorly supported. That study surveyed 270 people who entered couples therapy and found an average of 2.68 years between the start of serious problems and starting therapy, with most couples starting within two years. [Source: Doherty et al., 2021, Journal of Marital and Family Therapy]

Other samples differ. In a representative Dutch sample of 1,014 couples, only 19.5% of seriously dissatisfied partners ever received help, on average 3.7 years after the dissatisfaction began. [Source: Conradi et al., 2024, Family Process] In a US veterans sample, partners waited roughly 4 to 7 years. [Source: Jarnecke et al., 2020, Couple and Family Psychology: Research and Practice] Wives tend to recognize problems and consider therapy before husbands. [Source: Doss et al., 2003, Journal of Marital and Family Therapy]

Does the wait itself hurt your chances? We found no study that tests waiting time directly against outcome. What the research does show is that how couples treat each other when they arrive matters: high negative emotion, poor problem-solving and depression at intake predicted distress or divorce four years later. [Source: Snyder et al., 1993, Journal of Consulting and Clinical Psychology] At the same time, more distressed couples tend to make larger gains during therapy. [Source: Roddy et al., 2020, Journal of Consulting and Clinical Psychology] The honest summary: earlier is usually easier, but arriving late is not a reason to give up.

5Does couples therapy prevent divorce?

It can help, but it does not guarantee a couple stays together. In the 134-couple behavioural trial, 25.7% of IBCT couples and 27.9% of traditional BCT couples were separated or divorced five years after treatment. These were married couples selected for serious, long-standing distress. [Source: Christensen et al., 2010, Journal of Consulting and Clinical Psychology]

An older trial followed 59 couples for four years: 38% of couples who had behavioural marital therapy had divorced, compared with 3% after insight-oriented therapy. [Source: Snyder et al., 1991, Journal of Consulting and Clinical Psychology] That finding is contested, because critics argued the behavioural condition did not fairly represent the approach. [Source: Jacobson, 1991, Journal of Consulting and Clinical Psychology] In a large online trial, two web programs improved relationships but did not significantly reduce breakups by six months. [Source: Doss et al., 2020, Journal of Consulting and Clinical Psychology]

One limitation matters here: these long-term studies did not follow an untreated comparison group for years, so they cannot tell us how many couples would have separated without therapy. Some separations are also a reasonable outcome, reached with more clarity.

6Do the gains last?

For many couples, yes, but improvement often dips after therapy ends and then partly recovers. The table summarizes the main follow-up findings.

The 12-month meta-analysis figure rests on a small number of BCT studies, and the EFT two-year study had 32 couples, so both are less certain than the 134-couple trial. Overall, reviews describe treatment effects dissipating after therapy for about half of couples. [Source: Bradbury et al., 2020, Annual Review of Clinical Psychology]

7What predicts success or failure?

No single factor decides the outcome, but several show up repeatedly.

• Commitment. At five-year follow-up, higher commitment and a longer marriage were linked to lower odds of divorce or separation. [Source: Baucom et al., 2014, Journal of Consulting and Clinical Psychology]
• Severity and duration of distress. High negative emotion and poor problem-solving at intake predicted distress or divorce four years later. [Source: Snyder et al., 1993, Journal of Consulting and Clinical Psychology] Across non-randomized studies, older couples and longer relationships had better relationship outcomes. [Source: Owen et al., 2023, Family Process]
• Affairs. Among 134 couples followed for five years, divorce rates were 80% when an affair stayed secret during therapy, 43% when it had been revealed, and 23% when there was no affair. Only 19 couples had an affair, so treat these figures with caution. Affair couples who stayed married did as well as other couples. [Source: Marín et al., 2014, Couple and Family Psychology: Research and Practice]
• Substance use. Couple therapy designed for alcohol and drug problems improved relationship satisfaction (effect of 0.45 after treatment) and reduced substance use. [Source: Song et al., 2022, Alcohol and Alcoholism] Another meta-analysis found small effects and signs of publication bias. [Source: Schmit et al., 2020, Counseling Outcome Research and Evaluation] Couples with the most severe drinking and marital problems had the worst outcomes two years later. [Source: O'Farrell et al., 1992, Behavior Therapy]
• Untreated mental health problems. Depression in either partner at intake predicted worse long-term outcomes [Source: Snyder et al., 1993, Journal of Consulting and Clinical Psychology], and in one veterans clinic, more severe depression in the non-veteran partner predicted early dropout. [Source: Fischer et al., 2018, Family Process]
• Readiness of both partners. A strong working relationship with the therapist predicts better results (correlation of .297), and an alliance that is much stronger with one partner than the other predicts worse results. [Source: Friedlander et al., 2018, Psychotherapy] Nearly 40% of couples in a clinical sample showed signs of being mixed-agenda, with partners wanting different things from therapy. [Source: Tang et al., 2026, Journal of Marital and Family Therapy]

8When is couples therapy not the right first step?

Active intimate partner violence

Joint sessions can make things more dangerous if one partner is afraid of the other or is being controlled. Reviews suggest conjoint therapy can be safe and helpful only for carefully screened couples, with safety protocols and ongoing risk assessment, usually as part of a wider community response. [Source: McCollum et al., 2008, Violence and Victims] A meta-analysis of six studies concluded couples therapy may be viable in select situations only. [Source: Karakurt et al., 2016, Journal of Marital and Family Therapy] Reviews distinguish situational violence that erupts in conflict from violence driven by power and control, where joint therapy is not appropriate. [Source: Armenti et al., 2016, Couple and Family Psychology] If you feel unsafe, individual support and safety planning come first.

Untreated addiction

The couple-based addiction research usually adds couple sessions to individual treatment. In one classic trial, husbands had already begun individual alcoholism counselling before couple sessions started. [Source: O'Farrell et al., 1985, Behavior Therapy] Couple work can support recovery, but it is rarely a substitute for addiction treatment itself.

One partner has already decided to leave

When one partner is leaning out and the other wants to save the relationship, standard couples therapy tends to stall. Discernment counselling is a short, structured process for these mixed-agenda couples. Its goal is not to fix the relationship but to reach clarity about the next step: stay as things are, separate, or commit to a period of couples therapy. Much of each session is spent with each partner individually. In an analysis of 100 consecutive cases, about half of couples chose couples therapy and most of the rest chose divorce. [Source: Doherty et al., 2016, Journal of Marital and Family Therapy] This is a case series from the approach's developers, not a controlled trial. A small interview study of people who divorced afterward reported clearer decisions and more cooperative co-parenting. [Source: Emerson et al., 2020, Journal of Marital and Family Therapy]

9Online versus in-person couples therapy

The evidence so far suggests video sessions work about as well, with one caveat. In a study of 1,157 married clients, teletherapy was as effective as in-person therapy for couple satisfaction, but the working relationship with the therapist strengthened about twice as fast in person. [Source: Bradford et al., 2023, Psychotherapy Research] A small randomized trial of 30 couples in a six-session behavioural program found no differences between video and face-to-face delivery. [Source: Kysely et al., 2022, Frontiers in Psychology] A systematic review of 37 papers found video couple and family therapy feasible and acceptable, though the studies were too varied to pool. [Source: de Boer et al., 2021, Journal of Marital and Family Therapy]

Self-guided online programs are a separate thing from video therapy. The 8-hour OurRelationship program, adapted from IBCT, improved relationship satisfaction by an effect of 0.69 compared with a waiting list in 300 couples. [Source: Doss et al., 2016, Journal of Consulting and Clinical Psychology] Most of its trials come from its developers; an independent Danish pilot set out to replicate them. [Source: Trillingsgaard et al., 2025, Journal of Marital and Family Therapy]

10Why do couples drop out, and how often?

About 36% of couples who begin therapy stop early, before reaching their goals. Among 160 people who left without telling their therapist, reasons included discomfort at home or in session (69%), outside factors such as money or scheduling (67%), dissatisfaction with the partner, therapist or treatment (59%), and feeling better without having reached their goals (51%). [Source: Codecá et al., 2025, Journal of Marital and Family Therapy]

Rates vary by setting. In a US veterans clinic, 36.43% of couples dropped out during the assessment phase, and 24.74% of the rest left right after the first treatment session. [Source: Fischer et al., 2018, Family Process] In a mixed clinic sample of individual, couple and family cases, 20.6% stopped before the fourth session, and higher distress predicted leaving through a weaker therapeutic alliance. [Source: Anderson et al., 2018, Psychotherapy Research] Completion rates for the coached online program ranged from 54% to 65%. [Source: Le et al., 2023, Internet Interventions]

11What about unmarried, dating and same-sex couples?

The evidence base is mostly about married, heterosexual couples. The largest recent meta-analysis lists exclusively opposite-sex samples as a limitation. [Source: Roddy et al., 2020, Journal of Consulting and Clinical Psychology] A review of 111 outcome studies found couples were historically presumed heterosexual without being asked. [Source: Spengler et al., 2019, Journal of Marital and Family Therapy] The 134-couple trial recruited married couples only. [Source: Christensen et al., 2010, Journal of Consulting and Clinical Psychology] Some newer research is broader: in one large online trial, 52% of couples were married. [Source: Doss et al., 2020, Journal of Consulting and Clinical Psychology]

For same-sex couples, a systematic review found only 9 eligible studies covering 583 couples and concluded they remain underrepresented, with preliminary signs of benefit. [Source: Kousteni et al., 2020, Journal of Couple & Relationship Therapy] A pilot of a culturally tailored therapy for 11 female couples showed reduced distress. [Source: Pentel et al., 2021, Family Process] Studies rarely report outcome figures for unmarried or dating couples separately. There is no clear reason to expect the core skills to work differently, but the research has not tested that well.

12Couples therapy or individual therapy for depression and anxiety?

For depression, the two look broadly similar for mood, and couples therapy does more for the relationship. A Cochrane meta-analysis of 14 studies with 651 participants found both improved depressive symptoms with no difference between them, while couple therapy did more to reduce couple distress. The authors rated the evidence quality as low. [Source: Barbato et al., 2020, Family Process] A newer meta-analysis of 5 randomized trials (193 couples) found a moderate reduction in depressive symptoms, effect of 0.60. [Source: Chen et al., 2025, Acta Psychologica]

Across several disorders, couple-based cognitive-behavioural treatments appear at least as effective as individual CBT, and often more so when partners are substantially involved. [Source: Fischer et al., 2016, Family Process] We found no head-to-head trials comparing couple and individual therapy for anxiety specifically. In the online OurRelationship trial, anxious symptoms improved by an effect of 0.94 compared with a waiting list, not compared with individual therapy. [Source: Doss et al., 2016, Journal of Consulting and Clinical Psychology]

13How to read these numbers

Every figure in this article describes groups of couples in published studies. None of them is a prediction for your relationship, and none describes the results of any particular therapist or practice.

• Averages hide a wide range. An average improvement includes couples who changed a lot, couples who changed a little, and couples who did not change.
• Research couples are selected. Trials often screen out couples with violence, active addiction or serious mental illness, and therapists are closely trained and supervised. Results in everyday practice tend to be smaller.
• 'Improved' means a score moved. Most studies define success as a change on a satisfaction questionnaire, not as whether partners feel the relationship is right for them.
• Timing matters. A result measured on the last day of therapy can look different a year later, so check whether a number is from the end of treatment or from follow-up.
• Some evidence is thin. Small samples, older studies and research led by an approach's own developers all make a finding less certain.

The research can tell you that couples therapy helps many couples and what tends to get in the way. It cannot tell you in advance how your own therapy will go.

References

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This article is educational and is not a substitute for professional advice about your own relationship. If you are in crisis or thinking about harming yourself, call or text 988 in Canada. If you or someone else is in immediate danger, call 911.