Federal Criminal Appeals: Challenging a Conviction or Sentence

By Elizabeth Franklin-Best, Esq., and Christopher Zoukis, JD, MBA

A federal conviction is not always the end of the case. The federal system gives a convicted defendant the right to ask a higher court to review what happened — to examine the trial, the rulings, and the sentence for legal error. That review is the federal criminal appeal, and for many people, it is the most important opportunity that remains after a conviction.

Appellate work is where our firm built its name. Elizabeth Franklin-Best, our principal attorney, is recognized by Best Lawyers in America 2026 as a “Best Lawyer” in Appellate Practice, and our firm holds a Chambers USA 2026 ranking for Litigation: White-Collar Crime & Government Investigations. She is admitted to the United States Supreme Court and all twelve federal circuit courts of appeals, appears pro hac vice in district courts nationwide, and wrote Reversing Your Criminal Conviction, a practitioner’s guide to overturning convictions. Together with Managing Director Christopher Zoukis, she puts that appellate depth behind every appeal we take. Federal appellate jurisdiction rests on 28 U.S.C. § 1291 and the Federal Rules of Appellate Procedure.

This hub explains how federal criminal appeals work — what an appeal is and is not, the deadlines, the standards of review, the grounds for appeal, the appellate process, and the path to the Supreme Court. It also links to in-depth guides on each major topic. If you are weighing an appeal, the 14-day clock is already running — and a paid, one-hour initial consultation with a federal criminal appeals lawyer is the fastest way to learn exactly where your case stands.

Quick Answer

Question	Answer
What is a federal criminal appeal?	A request that a U.S. Court of Appeals review a conviction or sentence from a district court for legal error. It is not a new trial.
How long do I have to appeal?	In a federal criminal case, the notice of appeal must generally be filed within 14 days after entry of the judgment.
Is an appeal a new trial?	No. The court of appeals reviews the existing record for legal error — it does not hear witnesses or reweigh the facts.
What are standards of review?	The lenses the appellate court uses — de novo for law, clear error for facts, abuse of discretion for discretionary rulings — plus harmless and plain error.
What can an appeal achieve?	A court may affirm, reverse, or vacate and remand for a new trial, resentencing, or other relief. Outcomes can also be partial.
How do I get started?	Book a paid, one-hour initial consultation. We review the judgment, the deadline posture, and the realistic appellate issues, then map the next steps.

Key Takeaways

• A federal criminal appeal asks a U.S. Court of Appeals to review a conviction or sentence for legal error.
• The notice of appeal must generally be filed within 14 days of the judgment — a strict deadline.
• An appeal is not a new trial; it reviews the existing record for specific legal errors.
• Preservation matters — issues raised below get more favorable review than those raised for the first time on appeal.
• Standards of review — de novo, clear error, abuse of discretion, harmless error, plain error — often determine an appeal.
• An appeal can result in affirmance, reversal, or vacatur and remand for further proceedings.
• Ineffective-assistance and other off-record claims are generally pursued through post-conviction proceedings, not direct appeal.
• Acting quickly after sentencing is essential to preserving and building an appeal.
• Most plea agreements contain appeal waivers, but no waiver bars every claim — scope and validity always matter.
• Release pending appeal exists but is narrow: 18 U.S.C. § 3143(b) presumes detention unless strict criteria are met.

What Is a Federal Criminal Appeal?

A federal criminal appeal is a request that a higher court — a United States Court of Appeals — review a conviction or sentence from a federal district court for legal error. The appellate court examines the record of what happened below and decides whether the law was correctly applied.

The federal system is built in tiers. A case is tried, and a sentence imposed, in a United States District Court. A defendant convicted there can appeal to the United States Court of Appeals for the circuit that covers that district — there are twelve regional circuits. From the court of appeals, a further discretionary review may be sought in the United States Supreme Court.

An appeal is a fundamentally different proceeding from a trial. It is not about re-deciding guilt or innocence. It is about whether legal errors occurred — in the rulings, the procedure, the instructions, or the sentence — and whether those errors were serious enough to require relief. Understanding that distinction is the starting point for understanding appeals.

The Right to Appeal and the 14-Day Deadline

A defendant convicted of a federal crime has the right to a direct appeal to the court of appeals. That right is meaningful — but it is also governed by a strict and unforgiving deadline.

In a federal criminal case, the notice of appeal must generally be filed in the district court within 14 days after the entry of the judgment being appealed. Fourteen days is a short window, and missing it can forfeit the right to a direct appeal. While there are limited mechanisms to address missed deadlines, no one should rely on them. The safe and correct course is to act immediately after sentencing.

This is why a defendant considering an appeal should consult appellate counsel right away — ideally before the deadline passes. The notice of appeal is a simple document, but filing it on time is essential, and the work of evaluating and building the appeal should begin without delay.

The deadline comes from Federal Rule of Appellate Procedure 4(b), and two technical points about it matter. First, the district court may extend the time by up to 30 additional days on a finding of excusable neglect or good cause under Rule 4(b)(4) — a safety valve, never a plan. Second, the courts of appeals now treat Rule 4(b) as a claims-processing rule rather than a jurisdictional bar. In United States v. Harris, No. 22-2717 (2d Cir. Jan. 14, 2026), the Second Circuit reaffirmed that the criminal appeal deadline is not jurisdictional and held that the government forfeited an obvious untimeliness objection by failing to raise it — while confirming that when the government does object, the rule remains mandatory and inflexible. No one should ever count on a forfeiture.

And if your trial lawyer failed to file a notice of appeal you asked for, the law supplies a remedy. Under Garza v. Idaho, 586 U.S. 232 (2019), counsel who disregards a client’s instruction to file a notice of appeal performs deficiently, and prejudice is presumed — even when the plea agreement contained an appeal waiver. That claim is raised in a post-conviction motion, and when it succeeds it restores the lost appeal.

Applied Insight: The 14-day deadline is the single most important fact about a federal appeal. Everything else — the issues, the briefing, the argument — can be developed over months. But the notice of appeal cannot wait. A defendant unsure whether to appeal should still preserve the right by filing on time; the decision whether to pursue the appeal can be refined afterward.

What an Appeal Is Not

Misunderstandings about appeals are common, and clearing them up early prevents both false hope and missed opportunity.

An appeal is not a new trial. The court of appeals does not hear witnesses, does not take new evidence, and does not reweigh the facts the jury found. It reviews the existing record. An appeal is also not an opportunity to argue, in general terms, that the result was unfair — it must identify specific legal errors. An appeal is generally confined to the record: issues and evidence that were not part of the proceedings below usually cannot be raised for the first time on appeal.

This last point connects to a crucial concept: preservation. An issue raised and objected to at trial is “preserved” and receives a more favorable review. An issue that was not raised below is generally reviewed only under a much stricter standard, if it can be raised at all. What happened in the district court shapes what an appeal can accomplish — which is one reason careful trial work matters to appeals.

Claims that depend on facts outside the record — most importantly, claims of ineffective assistance of counsel — generally cannot be resolved on direct appeal. Those claims are usually raised through post-conviction proceedings instead. The direct appeal and post-conviction relief are distinct tracks, each with its own purpose.

Standards of Review

An appeal does not ask whether the appellate judges would have decided the case differently. It asks whether the district court committed reversible error, and that question is answered through “standards of review” — the lenses through which the appellate court examines each issue.

• De novo review. Questions of law are reviewed de novo — the appellate court decides them independently, giving no deference to the district court.
• Clear error. Findings of fact are reviewed for clear error — the appellate court accepts them unless it is left with a definite and firm conviction that a mistake was made.
• Abuse of discretion. Discretionary decisions are reviewed for abuse of discretion — a deferential standard under which the appellate court can affirm even a decision it might not have made.

Two further standards turn on preservation. A preserved error is reviewed for harmless error — the conviction stands only if the error did not affect the outcome. An unpreserved error is reviewed for plain error under Rule 52(b), the four-part framework of United States v. Olano, 507 U.S. 725 (1993): there must be (1) an error, (2) that is plain, (3) that affected substantial rights, and (4) that seriously affected the fairness, integrity, or public reputation of the proceedings. The Supreme Court underscored in Greer v. United States, 593 U.S. 503 (2021), that the defendant carries the burden on every prong — including showing a reasonable probability that the outcome would have been different without the error. The applicable standard often determines an appeal, which is why identifying it correctly for each issue is central to appellate work.

Preserving Error for Appeal

Preservation is the bridge between the trial court and the court of appeals, and it is built — or lost — in real time. Under Federal Rule of Criminal Procedure 51(b), a party preserves a claim of error by informing the district court of the action it wants the court to take, or by objecting to the court’s action and stating the grounds. There is no requirement of formal “exceptions” or magic words; what matters is that the judge had a fair chance to address the issue.

The Supreme Court applied that principle to sentencing in Holguin-Hernandez v. United States, 589 U.S. 169 (2020). A defendant who argues for a shorter sentence than the one the judge imposes has preserved an appellate challenge to the length of that sentence — no separate objection after the sentence is pronounced is required, and counsel need not utter the word “reasonableness.” Advocating for the outcome is itself the objection.

One distinction from Olano deserves emphasis: forfeiture is the failure to timely assert a right, while waiver is the intentional relinquishment of a known right. A forfeited claim still gets plain-error review on appeal. A waived claim — one counsel affirmatively abandoned or agreed to — generally gets no review at all. Skilled trial and sentencing advocacy protects the appellate record at every turn, which is one reason we think about the appeal long before the judgment is entered.

Appeal Waivers in Plea Agreements

Roughly 98% of sentenced federal defendants plead guilty, and most federal plea agreements include an appeal waiver — a promise not to appeal the conviction, the sentence, or both, usually with narrow carve-outs. Whether and how far that waiver reaches is often the first question in evaluating a federal appeal after a guilty plea.

Courts enforce appeal waivers that were entered knowingly and voluntarily, but enforcement has limits. A plea agreement is interpreted like a contract, so a waiver bars only the claims that fall within its scope — and as the Supreme Court explained in Garza v. Idaho, 586 U.S. 232 (2019), no appeal waiver serves as an absolute bar to all appellate claims. Courts have also recognized recurring grounds on which a waiver will not be enforced, including a sentence that exceeds the statutory maximum, a waiver that was not knowing and voluntary, a government breach of the plea agreement, and circumstances in which enforcement would work a miscarriage of justice. The precise formulations vary by circuit, which is why waiver questions demand circuit-specific analysis.

Reviewing the waiver is step one of every post-plea appellate evaluation we perform: what exactly was waived, what was carved out, and whether any recognized exception applies. A waiver that looks airtight at first reading often is not.

The Appellate Process in Brief

A federal appeal proceeds through a recognizable sequence. After the notice of appeal is filed, the district court record — the transcripts, filings, and exhibits — is assembled and transmitted to the court of appeals.

The heart of the appeal is the briefing. The appellant files an opening brief identifying the issues and arguing the law; the government files a response; and the appellant may file a reply. The briefs are where an appeal is won or lost — appellate decisions turn overwhelmingly on the quality of the written argument. In many cases, the court also hears oral argument, a focused exchange between the lawyers and the panel of judges. The court then issues a written decision.

Our federal appellate process and brief writing guide walks through each of these stages in depth, and our guide to federal direct appeals covers the direct appeal from start to finish.

Sentencing Appeals After Booker

Many federal appeals challenge the sentence rather than the conviction. Since United States v. Booker, 543 U.S. 220 (2005), the Sentencing Guidelines have been advisory, and appellate courts review sentences for reasonableness. Gall v. United States, 552 U.S. 38 (2007), set the framework: the court of appeals reviews all sentences — inside or outside the Guidelines range — under a deferential abuse-of-discretion standard.

Reasonableness review has two layers. Procedural reasonableness asks whether the district court calculated the Guidelines range correctly, treated the Guidelines as advisory, considered the 18 U.S.C. § 3553(a) factors, relied on accurate facts, and adequately explained the sentence. Substantive reasonableness asks whether the sentence is simply too long (or too short) in light of those factors. Guidelines-calculation errors are among the most frequently successful appellate issues, because a wrong starting range infects everything that follows.

Preservation here is more forgiving than many assume. Under Holguin-Hernandez, arguing for a lower sentence preserves the substantive-reasonableness challenge. And the Guidelines themselves keep moving: the Sentencing Commission’s November 1, 2025 simplification amendments removed the departure step from the former three-step process, a structural change that will shape sentencing — and sentencing appeals — for years.

Release Pending Appeal

Clients frequently ask whether they can remain out of custody while the appeal runs. The answer comes from 18 U.S.C. § 3143(b), and it is demanding. After a conviction and a sentence of imprisonment, the statute presumes detention.

To obtain release pending appeal, a defendant must show two things: by clear and convincing evidence that he is not likely to flee or pose a danger, and that the appeal is not for delay and raises a substantial question of law or fact likely to result in reversal, a new trial, a sentence without imprisonment, or a reduced sentence shorter than the time the appeal will take. Certain offenses face an even stricter rule. The “substantial question” showing is where these motions are won or lost — it requires a close, debatable issue, identified early and argued with precision.

Because the substantial-question analysis previews the merits of the appeal itself, a strong motion for release pending appeal and a strong opening brief grow from the same root: rigorous issue selection.

What Changed in Federal Appeals Law (2023–2026)

The last few years have been unusually productive for federal criminal appellants, particularly in white-collar cases. The Supreme Court has repeatedly narrowed federal criminal statutes — and every one of those decisions became an appellate issue the day it was announced.

• Ciminelli v. United States, 598 U.S. 306 (2023), invalidated the “right to control” theory of wire fraud, and Percoco v. United States, 598 U.S. 319 (2023), rejected vague honest-services instructions for private citizens.
• Dubin v. United States, 599 U.S. 110 (2023), held aggravated identity theft requires that the misuse of identity be at the crux of the fraud.
• Snyder v. United States, 603 U.S. 1 (2024), held 18 U.S.C. § 666 reaches bribes, not after-the-fact gratuities, and Fischer v. United States, 603 U.S. 480 (2024), confined § 1512(c)(2) obstruction to conduct impairing evidence.
• Erlinger v. United States, 602 U.S. 821 (2024), requires a jury, not a judge, to find that ACCA predicate offenses occurred on different occasions.
• Thompson v. United States, 604 U.S. 408 (2025), held § 1014 criminalizes false statements, not merely misleading ones, while Kousisis v. United States, 605 U.S. 114 (2025), upheld fraudulent-inducement theory and made materiality the key battleground.

Procedure moved too. The courts of appeals have continued to treat the Rule 4(b) deadline as a non-jurisdictional claims-processing rule, as the Second Circuit did in United States v. Harris in January 2026. And on the Guidelines side, the Commission’s 2024 amendments excluded acquitted conduct from the Guidelines calculation (Amendment 826) and wrote the intended-loss rule into the text of § 2B1.1 (Amendment 827) — changes that generate new sentencing arguments and new appellate issues. When a decision or amendment lands while a case is on direct review, the defendant generally gets its benefit; spotting those openings quickly is part of our job.

Possible Outcomes of an Appeal

A federal appeal can end in several ways, and understanding the realistic range of outcomes is part of evaluating whether to pursue one.

The court of appeals may affirm the conviction and sentence. It may reverse a conviction. It may vacate a conviction or sentence and remand the case to the district court for further proceedings, which can mean a new trial, resentencing, or other corrective action. In some cases, the relief is partial: certain counts or a sentence may be affected while others stand.

Honesty about outcomes matters. Most convictions are affirmed on appeal, and no responsible lawyer promises a reversal. But meritorious appeals do succeed, and even a partial victory — a vacated count, a resentencing — can be significant. A careful, candid assessment of the issues and their realistic prospects is what an appellate evaluation provides.

Applied Insight: The strength of an appeal is not measured by how unfair the result felt — it is measured by the specific, preserved legal errors in the record and the standards of review that apply to them. A clear-eyed appellate evaluation separates the issues that can genuinely move a court from those that cannot. That honest triage is the foundation of effective appellate advocacy.

Federal Appeals Topics We Cover

Federal appellate practice is a deep field. Our detailed guides cover the topics that matter most to a person considering an appeal:

• Federal Direct Appeals — the direct appeal of a conviction or sentence, from notice through decision.
• The Federal Appellate Process & Brief Writing — how an appeal moves through the court of appeals.
• Grounds for a Federal Appeal — the kinds of legal error that can support an appeal.
• Petitioning the U.S. Supreme Court — seeking certiorari review in the Supreme Court.

Why Work With Elizabeth Franklin-Best, P.C.?

When the question is whether a conviction or sentence can be undone, credentials in the appellate courts are what count. Best Lawyers in America 2026 named Elizabeth Franklin-Best a “Best Lawyer” in Appellate Practice; Chambers USA 2026 ranks the firm for Litigation: White-Collar Crime & Government Investigations. Her bar admissions span the Supreme Court of the United States and every one of the twelve regional circuits, and Reversing Your Criminal Conviction — her book on post-trial remedies — reflects a career spent on exactly the questions this page covers.

Our method is the same in every appeal: read the full record, triage the issues honestly against the standards of review, brief the strongest claims with discipline, and argue them well. We decline to pad briefs with weak issues that dilute strong ones. We handle direct appeals in all twelve regional circuits, litigate release pending appeal where the facts support it, and carry meritorious cases to the Supreme Court on certiorari. Wherever your case was tried, we can be there.

Talk With a Federal Appeals Lawyer

Fourteen days. That is how long the federal rules give you to start an appeal, and it is the reason the most important call you make after sentencing is the next one. The issues, the briefing schedule, even the choice of counsel can all be sorted out later — the notice of appeal cannot.

Bring us the judgment and the docket, and in a paid, one-hour initial consultation we will tell you what we see: the deadline posture, the waiver landscape, the issues with genuine appellate traction, and the ones without. Candor first, then strategy. Book the consultation now so the 14-day window works for you instead of against you.