A South Dakota federal judge has sentenced a Sioux Falls tax preparer to more than two and a half years in prison for a fraud scheme investigators say ran through his own business and touched hundreds of other people’s returns. Amon Eustache Aboua, who operated ACU Tax Services, was sentenced September 21, 2026, to 33 months in federal prison and ordered to repay $540,267.43 in tax restitution. IRS Criminal Investigation says the fraud reached more than 500 returns filed through the business, a scale that turns this from one man’s bad tax filings into a client list of people whose own returns may now warrant a second look.
Thirty-Three Months And A Six-Figure Restitution Order
U.S. District Judge Karen E. Schreier sentenced Aboua on September 21, 2026, to 33 months in federal prison followed by three years of supervised release, according to the IRS-CI sentencing announcement. The court also ordered $540,267.43 in tax restitution, on top of a separate $232,600 owed for child support, the release states, a combined debt that follows Aboua well past his release date, since a criminal restitution order does not disappear the way an unpaid invoice might.
What a 500-return sentence doesn’t fix for clients: A preparer’s conviction closes the government’s case, but it does not tell any individual client whether their own past return was one of the ones falsified, which is a documentation gap the kit’s evidence-and-report log is built to help close. See how The Senior Fraud Defense & First-Hour Recovery Kit organizes a fraud evidence log.
More Than 500 Returns Tied To ACU Tax Services
IRS-CI ties more than 500 returns to Aboua’s business, ACU Tax Services, though the fraud charges themselves centered on more than 20 clients whose deductions were fabricated between February 2018 and April 2019, per the agency’s release. Prosecutors say Aboua invented charitable contributions and itemized expenses on those clients’ returns to inflate their refunds, without the clients’ knowledge, and then personally profited from the padded amounts. A scheme built on returns the actual filer never reviewed line by line is one where the taxpayer, not just the preparer, can end up owing the IRS money later.
The gap between the 500-plus returns IRS-CI ties to the business overall and the roughly 20 clients named in the fabricated-deduction scheme is itself notable: it means the government’s case focused on a specific pattern of fraud within a much larger client base, rather than alleging every return ACU Tax Services filed was falsified. For the hundreds of other clients whose returns fall outside that 20-client group, the release offers no assurance one way or the other about whether their filings were affected, since IRS-CI’s announcement addresses the charged conduct, not the full scope of the business’s return volume.
Federal Prosecutors On The Pattern Behind The Case
U.S. Attorney Ron Parsons said in the IRS-CI release announcing the sentence that anyone defrauding the government, whatever form that theft takes and whatever scheme is used, should expect to hear from federal prosecutors. IRS Criminal Investigation Special Agent William Steenson added that return preparers carry a responsibility to prepare and submit accurate tax returns on behalf of their clients, a responsibility the government says Aboua violated repeatedly across the life of the business. Supervisory Assistant U.S. Attorney Connie Larson prosecuted the case, according to the same release.
The two officials’ statements target different parts of the same case: Parsons’s warning speaks to deterrence for anyone else running a similar scheme, while Steenson’s comment restates the specific professional duty investigators say Aboua broke by inflating deductions his clients never claimed themselves. Between them, the two comments frame the sentencing as both a punishment for a completed scheme and a warning aimed at preparers still operating.
Why A Preparer’s Conviction Doesn’t End A Client’s Exposure
When a preparer is convicted of falsifying deductions, the IRS does not automatically fix every return that preparer touched: the agency can still examine or adjust individual clients’ filings, and any refund built on a fabricated deduction can be clawed back from the person whose name is on the return, not only from the preparer who filed it. That distinction is easy to miss in coverage that focuses on the preparer’s sentence rather than the clients left holding returns they never actually reviewed. Anyone who used ACU Tax Services during the period the government cited has a practical reason to request a copy of what was actually filed on their behalf.
A Restitution Order That Outlasts A Prison Term
Aboua’s 33-month sentence has an end date; his $540,267.43 restitution obligation does not disappear when it does, since federal restitution orders remain collectible well beyond a defendant’s release, per standard federal sentencing practice referenced in the IRS-CI release. For the roughly 20 clients whose deductions were fabricated, the more immediate money question is not what Aboua owes the government, but whether their own refunds from those years were ever legitimate to begin with.
The release also separates the $540,267.43 tax restitution from a further $232,600 Aboua owes in past-due child support, two debts that arise from entirely different legal proceedings but that both now attach to the same three-year period of supervised release. That combined obligation is a reminder that a fraud sentence rarely closes out a defendant’s other financial liabilities; it simply adds a new, federally enforced one on top of whatever else a court has already ordered.
Judge Schreier’s three-year supervised-release term, which follows the 33 months in custody, gives federal probation officers years of continued oversight over Aboua’s finances after his release, according to the same release. For the clients whose returns are part of the case, that extended supervision does not shorten their own timeline for confirming what was filed; the IRS’s ability to examine or adjust an individual return generally runs on its own separate statute of limitations, independent of how long Aboua himself remains under court supervision.
What A Client Of A Convicted Preparer Checks Next
A 33-month sentence and a six-figure restitution order close the government’s case against Amon Eustache Aboua, but they leave an open question for anyone whose return passed through ACU Tax Services: whether the refund they received was built on a deduction that never happened. Sorting that out starts with documenting what was actually filed, not with waiting for a notice to arrive first.
The Senior Fraud Defense & First-Hour Recovery Kit includes a fraud evidence and report log and an account and device inventory, both built for organizing exactly this kind of after-the-fact documentation once a preparer or account has been compromised.
Compare the return against the documentation habits in The Senior Fraud Defense & First-Hour Recovery Kit.
This article was produced with AI assistance and checked against the primary sources linked above.
Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
