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Should you trust AI with your taxes?
AI can draft a return in seconds. Here are ten reasons to think twice before you let it prepare yours, from who is liable for mistakes to who answers when the IRS writes. And a short list of what it is good for.
Artificial intelligence is a useful tool, and it is getting better. It can explain a form, summarize a rule, and organize your questions before an appointment. But preparing a return takes the right questions, current law, your history, and someone who signs it and stands behind it. Here are ten reasons to think twice before letting AI prepare yours.
1. You are responsible for every number, not the AI
When you sign a return, you declare under penalty of perjury that it is true and complete. The IRS holds the taxpayer responsible for an accurate return, no matter who or what prepared it. The software’s terms say the same thing: the output is yours to check, and if a figure is wrong, the tax, the penalty and the interest are yours. AI tools carry no liability for their answers. It is free right up until it isn’t, and then it is your bill.
2. No one signs it, and no one stands behind it
A paid preparer signs the return with an IRS-issued preparer number and is accountable for it under IRS rules; an enrolled agent is licensed by the IRS and held to its standards of practice. An AI tool is not a preparer. It signs nothing and answers to no one. If it is wrong, there is no one to call and no one to amend the return. If no one is willing to sign it, ask yourself why you are.
3. It only knows what you tell it
A chatbot cannot see the 1099 you forgot, the brokerage statement that came in March, the cryptocurrency sale, or the side income that never got a form. The IRS has a copy of every form issued under your Social Security number and matches them against the return. The IRS already knows what you forgot. The AI does not.
4. It doesn’t ask the questions that matter
Most of what changes a return comes from questions, not forms: Did anyone move in or out of the house? Did you pay anyone to watch the kids? Did you sell anything? Did you help support a parent? Those answers are where the deductions are, and where the mistakes are. An AI answers the question you asked, not the one you did not know to ask. Nobody ever saved money on taxes by being asked fewer questions.
Worked example: one sentence, three credits
A client mentions in passing that her daughter moved back home in August. A preparer asks four questions no software asks.
| Question | Answer | What it decided |
|---|---|---|
| How long did she live with you? | August through December, plus the summer: more than half the year | She can be a qualifying child |
| Was she a full-time student this year? | Yes, 21, spring semester | Under 24 and a student: passes the age test |
| Who paid her expenses? | Mostly the mother; the daughter earned $9,000 | Support test passed; the mother claims her |
| Is the mother unmarried and paying for the home? | Yes | Head of household: $24,150 standard deduction instead of $16,100 |
| Result | Head of household, the $500 other-dependent credit, and the daughter’s spring tuition on the mother’s return for the education credit: roughly $3,500 of tax difference from one remark |
Software works from what is entered; a preparer works from the conversation. The AI would have prepared a correct single return for a woman with no dependents, and it would have been wrong.
5. Confident is not the same as correct
AI tools are built to produce a fluent answer, whether or not it is right, and they do not flag their own uncertainty the way a careful person does. A wrong answer about a phase-out reads exactly like a right one, including rules that do not exist and numbers that do not add up. It never says “I’m not sure.” That should worry you.
6. Tax law changes, and the AI may be working from last year’s rules
The 2025 law changed the standard deduction, the child credit, the SALT cap and charitable deductions, and added four deductions that did not exist before. Thresholds move every January. A tool trained on older material states older rules with the same confidence. Congress rewrote the rules; not every chatbot got the memo.
7. Your Social Security number goes into a chatbot
Along with your income, your dependents’ birthdates and your bank account. Where that is stored, and whether it trains the next version, depends on the provider’s terms, which few people read. Federal law (Internal Revenue Code section 7216) binds tax preparers on how they use and share your return information, and requires them to have a written data security plan. It does not require that of a chatbot. Your tax return is the most complete picture of your life on paper; be careful who you show it to.
8. Mistakes surface years later, with penalties and interest
The IRS matching program runs a year or more after a return is filed, and the IRS generally has three years to assess more tax, six if income was substantially understated. An error made in April 2027 can arrive as a notice in late 2028, often with a 20% accuracy-related penalty plus interest running from the original due date. The return was done in seconds; the letter takes two years to arrive.
9. When the IRS writes, AI can’t represent you
Only an enrolled agent, a CPA or an attorney can speak to the IRS for you. A chatbot can help you draft a letter. It cannot answer a notice, attend an audit, negotiate a payment plan, or be on the phone when the IRS calls back.
10. It doesn’t know your history or your state
A solar credit still being used up, a capital loss deducted $3,000 at a time, a rental’s depreciation, the cost basis of inherited stock: these live in last year’s return. And Colorado’s pension subtraction, its 529 deduction and its overtime addback do not appear in a general answer about federal tax. AI sees one year in isolation, and next year it starts over from scratch.
What AI is good for
Use it to learn: to explain a form, define a term, or lay out the questions to bring to an appointment. Use it to draft a letter you will have a professional check. Use it to understand this booklet. When it is time to prepare and sign the return, have a person do it, and keep the same person next year. If AI prepared a return and a letter has arrived, a preparer can review and amend it; penalties are lower for a taxpayer who comes forward before the IRS writes.
Behind the scenes
A preparer’s most useful work is often a question, not a calculation, and the questions are not a formality: the IRS requires a preparer to ask about digital assets and, for the earned income credit, the child credit and head-of-household status, to document the answers and keep them in the file. The other half of the work is memory. A preparer carries the carryforwards, the basis of the stock the client’s father left her, and the year the solar credit ran out, from one return to the next. The software starts every year blank; the file does not.
The Colorado side
The Colorado return is where a general-purpose tool is weakest. Its subtractions are per person with a shared cap, its credits switch on and off with the state’s revenue forecast, its $300,000 addback is a cliff, and its treatment of the new federal deductions is decided each session. An answer that is right about federal tax and silent about Colorado is a return with the state half missing. Every Colorado item in this booklet has a page on this site; none of it appears in a chatbot’s general answer.
What to bring your preparer, if AI already prepared a return
- The return as filed, every page, including the Colorado return
- Every form that arrived for the year, so the return can be checked against them and against the IRS transcript
- Any IRS or Colorado letter, unanswered
- Last year’s return, for the carryovers the AI could not see
- The questions the tool never asked: who lived with you, what you sold, whom you paid, what you gave
Questions people ask
Isn’t tax software already AI?
Tax software follows the forms and the law as programmed, with an interview that asks fixed questions; it is checked by the vendor and updated each year. A general chatbot generates text from patterns and is not built for the return. The concerns above are about the second kind.
I used AI to check my preparer’s work and it found a “mistake.” Who is right?
Ask the preparer. Often the chatbot is applying an old rule or a federal rule to a Colorado line. Sometimes it is right, and a good preparer will say so. Either way, the preparer signed the return and can explain every figure on it.
Can I ask an AI to explain my IRS letter?
Yes; that is a good use. Then decide with a professional how to respond, because the response is what the IRS acts on.
Is it safe to upload my W-2 to a chatbot?
Read the provider’s terms first. A W-2 carries your Social Security number, your employer and your income. A preparer is bound by federal law on how that information is used; a general service is bound by its own terms.
Use it to learn; have a person prepare and sign
AI is a good way to understand a form, define a term, or write down the questions to bring to an appointment. The return itself needs someone who asks the questions, knows last year’s file and this year’s law, and signs at the bottom. If AI already prepared a return and something looks wrong, a preparer can review and amend it.