Why Standards of Review Matter in California Appellate Practice

One of the most important concepts in California appellate law is the standard of review.

The standard of review determines how much deference an appellate court gives to the trial court's decision. In many appeals, the standard of review can be outcome-determinative. A strong legal issue reviewed independently may have a greater likelihood of success than a fact-intensive dispute reviewed under a highly deferential standard.

California appellate courts generally apply three principal standards of review:

• De Novo Review

• Substantial Evidence Review

• Abuse of Discretion Review

Understanding these standards is essential because appellate courts do not retry cases, hear witnesses, or reweigh evidence. Instead, they review trial court decisions through the lens of the applicable standard of review.

De Novo Review

The Least Deferential Standard

De novo review is the most favorable standard for an appellant because the Court of Appeal gives no deference to the trial court's legal conclusions.

Under de novo review, the appellate court considers the issue anew, as if it were deciding the question for the first time.

In other words:

The Court of Appeal independently determines whether the trial court's legal ruling was correct.

Common Issues Reviewed De Novo

California courts frequently apply de novo review to:

• Interpretation of statutes;

• Interpretation of contracts;

• Questions of law;

• Summary judgments;

• Anti-SLAPP rulings;

• Demurrers;

• Jurisdictional questions;

• Constitutional issues;

• Interpretation of court rules.

Example

Suppose a trial court interprets a contract provision and determines that it is unambiguous.

On appeal, the Court of Appeal generally reviews that determination independently.

The appellate court is not required to accept the trial court's interpretation and may reach its own legal conclusion.

Why De Novo Review Matters

Because appellate courts exercise independent judgment, de novo review often presents the greatest opportunity for reversal.

It is therefore common for appellate advocates to argue that a disputed issue presents a pure question of law subject to independent review.

Substantial Evidence Review

A Highly Deferential Standard

Substantial evidence review is among the most difficult standards for an appellant to overcome.

Under this standard, appellate courts ask only:

Is there substantial evidence supporting the trial court's findings?

The question is not whether the appellate court would have reached the same conclusion.

Nor is the question whether conflicting evidence exists.

Instead, the inquiry is whether there is evidence that is:

• reasonable;

• credible; and

• of solid value.

If such evidence exists, the judgment ordinarily must be affirmed.

The Appellate Court Does Not Reweigh Evidence

A fundamental principle of substantial evidence review is that appellate courts do not:

• reassess witness credibility;

• resolve conflicts in testimony;

• substitute their judgment for the trial court;

• reweigh competing evidence.

The appellate court must:

• view the record in the light most favorable to the prevailing party;

• draw all reasonable inferences supporting the judgment;

• disregard contrary evidence whenever possible.

Common Issues Reviewed Under the Substantial Evidence Standard

Examples include:

• Bench trial factual findings;

• Jury verdicts;

• Findings regarding credibility;

• Family court factual determinations;

• Damages awards;

• Easement disputes;

• Child custody factual findings.

Example

After a bench trial, a judge finds that a witness was credible.

The opposing party argues on appeal that the witness lied.

The Court of Appeal generally will not revisit that credibility determination.

Credibility determinations belong to the trial court.

As a result, substantial evidence review is often described as highly deferential.

Why This Standard Matters

Appellants frequently underestimate the difficulty of overcoming substantial evidence review.

Appeals challenging factual findings are often unsuccessful because the appellate court is required to presume that the judgment is correct.

Abuse of Discretion Review

Deference to Trial Court Judgment

Abuse of discretion review applies when trial courts possess authority to choose among several permissible outcomes.

Under this standard, appellate courts do not ask:

Was the trial court's decision the best decision?

Instead, the inquiry becomes:

Was the decision beyond the bounds of reason?

California courts often describe abuse of discretion as existing when:

• the court applies the wrong legal standard;

• the ruling lacks evidentiary support;

• no reasonable judge could have reached the same conclusion.

Common Issues Reviewed for Abuse of Discretion

Examples include:

• Attorney fee awards;

• Discovery sanctions;

• Family Code section 271 sanctions;

• Evidentiary rulings;

• Continuances;

• Custody determinations;

• Requests for equitable relief;

• Motions for new trial;

• Motions under Code of Civil Procedure section 473;

• Case management decisions.

Example

A trial court awards attorney's fees after determining that the requested fees were reasonable.

The appellate court generally reviews that determination for abuse of discretion.

Even if the appellate court might have awarded a different amount, it ordinarily will affirm unless the award falls outside the range of permissible choices.

Abuse of Discretion Does Not Mean Unlimited Discretion

Trial courts do not have unrestricted authority.

Discretion must be exercised according to legal principles.

As California courts have often stated:

Discretion is abused whenever a court exceeds the bounds of reason.

Moreover, a court necessarily abuses its discretion when it applies an incorrect legal rule.

Mixed Standards of Review

Many appeals involve more than one standard of review.

For example:

Family Law Appeals

Child custody decisions may involve:

• de novo review for statutory interpretation;

• substantial evidence review for factual findings;

• abuse of discretion review for the ultimate custody determination.

Anti-SLAPP Appeals

Anti-SLAPP proceedings may involve:

• de novo review regarding legal sufficiency;

• substantial evidence review concerning factual disputes.

Administrative Mandamus Proceedings

Administrative writ cases frequently involve:

• independent judgment review;

• substantial evidence review;

• abuse of discretion review.

The applicable standard depends upon the specific issue being challenged.

Determining the Standard of Review

One of the first tasks in any appeal is identifying the applicable standard of review.

Experienced appellate practitioners often devote substantial attention to this issue because the standard of review frames the entire appeal.

Appellate briefs routinely contain a section titled:

Standard of Review

This section explains:

• the applicable standard;

• why it governs the issue presented;

• why the standard favors the client's position.

In many cases, the parties dispute which standard applies.

Those disputes can significantly influence the likelihood of success on appeal.

Why Standards of Review Matter

Standards of review are not merely technical appellate concepts.

They often determine whether an appeal has a realistic chance of success.

An appellant challenging:

• a pure legal issue;

• statutory interpretation; or

• summary judgment

may benefit from independent review.

By contrast, an appellant attempting to overturn credibility determinations or factual findings faces a considerably steeper challenge.

For that reason, appellate lawyers frequently analyze standards of review before recommending whether an appeal should be pursued.

Understanding how an appellate court will review the issues is often just as important as understanding the underlying law itself.

Contact Decker Law

Decker Law represents clients throughout California in family law appeals, property division appeals, post-judgment enforcement proceedings, and other complex appellate matters. If you are considering an appeal involving community property, real estate division, or a family court accounting dispute, contact Decker Law to discuss your appellate options.